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-rw-r--r--erts/emulator/beam/erl_time_sup.c1859
1 files changed, 1406 insertions, 453 deletions
diff --git a/erts/emulator/beam/erl_time_sup.c b/erts/emulator/beam/erl_time_sup.c
index 3272a5326d..d47d1682d7 100644
--- a/erts/emulator/beam/erl_time_sup.c
+++ b/erts/emulator/beam/erl_time_sup.c
@@ -18,60 +18,8 @@
*/
/*
-** Support routines for the timer wheel
-**
-** This code contains two strategies for dealing with
-** date/time changes in the system.
-** If the system has some kind of high resolution timer (HAVE_GETHRTIME),
-** the high resolution timer is used to correct the time-of-day and the
-** timeouts, the base source is the hrtimer, but at certain intervals the
-** OS time-of-day is checked and if it is not within certain bounds, the
-** delivered time gets slowly adjusted for each call until
-** it corresponds to the system time (built-in adjtime...).
-** The call gethrtime() is detected by autoconf on Unix, but other
-** platforms may define it in erl_*_sys.h and implement
-** their own high resolution timer. The high resolution timer
-** strategy is (probably) best on all systems where the timer have
-** a resolution higher or equal to gettimeofday (or what's implemented
-** is sys_gettimeofday()). The actual resolution is the interesting thing,
-** not the unit's thats used (i.e. on VxWorks, nanoseconds can be
-** retrieved in terms of units, but the actual resolution is the same as
-** for the clock ticks).
-** If the systems best timer routine is kernel ticks returned from
-** sys_times(), and the actual resolution of sys_gettimeofday() is
-** better (like most unixes that does not have any realtime extensions),
-** another strategy is used. The tolerant gettimeofday() corrects
-** the value with respect to uptime (sys_times() return value) and checks
-** for correction both when delivering timeticks and delivering nowtime.
-** this strategy is slower, but accurate on systems without better timer
-** routines. The kernel tick resolution is not enough to implement
-** a gethrtime routine. On Linux and other non solaris unix-boxes the second
-** strategy is used, on all other platforms we use the first.
-**
-** The following is expected (from sys.[ch] and erl_*_sys.h):
-**
-** 64 bit integers. So it is, and so it will be.
-**
-** sys_init_time(), will return the clock resolution in MS and
-** that's about it. More could be added of course
-** If the clock-rate is constant (i.e. 1 ms) one can define
-** SYS_CLOCK_RESOLUTION (to 1),
-** which makes erts_deliver_time/erts_time_remaining a bit faster.
-**
-** if HAVE_GETHRTIME is defined:
-** sys_gethrtime() will return a SysHrTime (long long) representing
-** nanoseconds, sys_init_hrtime() will do any initialization.
-** else
-** a long (64bit) integer type called Sint64 should be defined.
-**
-** sys_times() will return clock_ticks since start and
-** fill in a SysTimes structure (struct tms). Instead of CLK_TCK,
-** SYS_CLK_TCK is used to determine the resolution of kernel ticks.
-**
-** sys_gettimeofday() will take a SysTimeval (a struct timeval) as parameter
-** and fill it in as gettimeofday(X,NULL).
-**
-*/
+ * Support routines for the time
+ */
#ifdef HAVE_CONFIG_H
# include "config.h"
@@ -80,384 +28,1029 @@
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
-
+
static erts_smp_mtx_t erts_timeofday_mtx;
-
-static SysTimeval inittv; /* Used everywhere, the initial time-of-day */
+static erts_smp_mtx_t erts_get_time_mtx;
static SysTimes t_start; /* Used in elapsed_time_both */
-static SysTimeval gtv; /* Used in wall_clock_elapsed_time_both */
-static SysTimeval then; /* Used in get_now */
-static SysTimeval last_emu_time; /* Used in erts_get_emu_time() */
-SysTimeval erts_first_emu_time; /* Used in erts_get_emu_time() */
+static ErtsMonotonicTime prev_wall_clock_elapsed; /* Used in wall_clock_elapsed_time_both */
+static ErtsMonotonicTime previous_now; /* Used in get_now */
+
+static ErtsMonitor *time_offset_monitors = NULL;
+static Uint no_time_offset_monitors = 0;
-union {
- erts_smp_atomic_t time;
- char align[ERTS_CACHE_LINE_SIZE];
-} approx erts_align_attribute(ERTS_CACHE_LINE_SIZE);
+#ifdef DEBUG
+static int time_sup_initialized = 0;
+#endif
+
+#define ERTS_MONOTONIC_TIME_KILO \
+ ((ErtsMonotonicTime) 1000)
+#define ERTS_MONOTONIC_TIME_MEGA \
+ (ERTS_MONOTONIC_TIME_KILO*ERTS_MONOTONIC_TIME_KILO)
+#define ERTS_MONOTONIC_TIME_GIGA \
+ (ERTS_MONOTONIC_TIME_MEGA*ERTS_MONOTONIC_TIME_KILO)
+#define ERTS_MONOTONIC_TIME_TERA \
+ (ERTS_MONOTONIC_TIME_GIGA*ERTS_MONOTONIC_TIME_KILO)
static void
-init_approx_time(void)
+schedule_send_time_offset_changed_notifications(ErtsMonotonicTime new_offset);
+
+/*
+ * NOTE! ERTS_MONOTONIC_TIME_START *need* to be a multiple
+ * of ERTS_MONOTONIC_TIME_UNIT.
+ */
+
+#if ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT
+
+#ifdef ARCH_32
+/*
+ * Want to use a big-num of arity 2 as long as possible (584 years
+ * in the nano-second time unit case).
+ */
+#define ERTS_MONOTONIC_TIME_START \
+ (((((((ErtsMonotonicTime) 1) << 32)-1) \
+ / ERTS_MONOTONIC_TIME_UNIT) \
+ * ERTS_MONOTONIC_TIME_UNIT) \
+ + ERTS_MONOTONIC_TIME_UNIT)
+
+#else /* ARCH_64 */
+
+#if ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT <= 1000*1000
+
+/*
+ * Using micro second time unit or lower. Start at zero since
+ * time will remain an immediate for a very long time anyway
+ * (18279 years in the micro second case)...
+ */
+#define ERTS_MONOTONIC_TIME_START ((ErtsMonotonicTime) 0)
+
+#else /* ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT > 1000*1000 */
+
+/*
+ * Want to use an immediate as long as possible (36 years in the
+ * nano-second time unit case).
+*/
+#define ERTS_MONOTONIC_TIME_START \
+ ((((ErtsMonotonicTime) MIN_SMALL) \
+ / ERTS_MONOTONIC_TIME_UNIT) \
+ * ERTS_MONOTONIC_TIME_UNIT)
+
+#endif /* ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT > 1000*1000 */
+
+#endif /* ARCH_64 */
+
+#define ERTS_MONOTONIC_OFFSET_NATIVE ERTS_MONOTONIC_TIME_START
+#define ERTS_MONOTONIC_OFFSET_NSEC ERTS_MONOTONIC_TO_NSEC__(ERTS_MONOTONIC_TIME_START)
+#define ERTS_MONOTONIC_OFFSET_USEC ERTS_MONOTONIC_TO_USEC__(ERTS_MONOTONIC_TIME_START)
+#define ERTS_MONOTONIC_OFFSET_MSEC ERTS_MONOTONIC_TO_MSEC__(ERTS_MONOTONIC_TIME_START)
+#define ERTS_MONOTONIC_OFFSET_SEC ERTS_MONOTONIC_TO_SEC__(ERTS_MONOTONIC_TIME_START)
+
+#else /* ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT */
+
+/*
+ * Initialized in erts_init_time_sup()...
+ */
+
+#define ERTS_MONOTONIC_TIME_START (time_sup.r.o.start)
+#define ERTS_MONOTONIC_OFFSET_NATIVE (time_sup.r.o.start_offset.native)
+#define ERTS_MONOTONIC_OFFSET_NSEC (time_sup.r.o.start_offset.nsec)
+#define ERTS_MONOTONIC_OFFSET_USEC (time_sup.r.o.start_offset.usec)
+#define ERTS_MONOTONIC_OFFSET_MSEC (time_sup.r.o.start_offset.msec)
+#define ERTS_MONOTONIC_OFFSET_SEC (time_sup.r.o.start_offset.sec)
+
+#endif /* ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT */
+
+#define ERTS_MONOTONIC_TO_SYS_TIME_VAL(TVP, MT) \
+ do { \
+ ErtsMonotonicTime sec__, usec__; \
+ sec__ = ERTS_MONOTONIC_TO_SEC((MT)); \
+ usec__ = ERTS_MONOTONIC_TO_USEC((MT)) - sec__*1000000; \
+ ASSERT(usec__ < 1000000); \
+ (TVP)->tv_sec = sec__; \
+ (TVP)->tv_usec = usec__; \
+ } while (0)
+
+#define ERTS_MAX_SYSTEM_TIME_DIFF ERTS_MSEC_TO_MONOTONIC(10)
+#define ERTS_SYSTEM_TIME_DIFF_EXCEED_LIMIT(ESYSTIME, OSSYSTIME) \
+ (((Uint64) (ESYSTIME)) - (((Uint64) (OSSYSTIME)) \
+ - ERTS_MAX_SYSTEM_TIME_DIFF) \
+ > 2*ERTS_MAX_SYSTEM_TIME_DIFF)
+
+#define ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF (ERTS_MAX_SYSTEM_TIME_DIFF/2)
+#define ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF ERTS_USEC_TO_MONOTONIC(500)
+
+struct time_sup_read_only__ {
+ ErtsMonotonicTime (*get_time)(void);
+ int correction;
+ ErtsTimeWarpMode warp_mode;
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ ErtsMonotonicTime moffset;
+ int os_monotonic_disable;
+ char *os_monotonic_func;
+ char *os_monotonic_clock_id;
+ int os_monotonic_locked;
+ Uint64 os_monotonic_resolution;
+#endif
+#if !ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT
+ ErtsMonotonicTime start;
+ struct {
+ ErtsMonotonicTime native;
+ ErtsMonotonicTime nsec;
+ ErtsMonotonicTime usec;
+ ErtsMonotonicTime msec;
+ ErtsMonotonicTime sec;
+ } start_offset;
+#endif
+};
+
+typedef struct {
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ ErtsMonotonicTime drift; /* Correction for os monotonic drift */
+#endif
+ ErtsMonotonicTime error; /* Correction for error between system times */
+} ErtsMonotonicCorrection;
+
+typedef struct {
+ ErtsMonotonicTime erl_mtime;
+ ErtsMonotonicTime os_mtime;
+ ErtsMonotonicCorrection correction;
+} ErtsMonotonicCorrectionInstance;
+
+#define ERTS_DRIFT_INTERVALS 5
+typedef struct {
+ struct {
+ struct {
+ ErtsMonotonicTime sys;
+ ErtsMonotonicTime mon;
+ } diff;
+ struct {
+ ErtsMonotonicTime sys;
+ ErtsMonotonicTime mon;
+ } time;
+ } intervals[ERTS_DRIFT_INTERVALS];
+ struct {
+ ErtsMonotonicTime sys;
+ ErtsMonotonicTime mon;
+ } acc;
+ int ix;
+ int dirty_counter;
+} ErtsMonotonicDriftData;
+
+typedef struct {
+ ErtsMonotonicCorrectionInstance prev;
+ ErtsMonotonicCorrectionInstance curr;
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ ErtsMonotonicDriftData drift;
+#endif
+ ErtsMonotonicTime last_check;
+ int short_check_interval;
+} ErtsMonotonicCorrectionData;
+
+struct time_sup_infrequently_changed__ {
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ struct {
+ erts_smp_rwmtx_t rwmtx;
+ ErlTimer timer;
+ ErtsMonotonicCorrectionData cdata;
+ } parmon;
+ ErtsMonotonicTime minit;
+#endif
+ int finalized_offset;
+ SysTimeval inittv; /* Used everywhere, the initial time-of-day */
+ ErtsMonotonicTime not_corrected_moffset;
+ erts_atomic64_t offset;
+};
+
+struct time_sup_frequently_changed__ {
+ ErtsMonotonicTime last_not_corrected_time;
+};
+
+static struct {
+ union {
+ struct time_sup_read_only__ o;
+ char align__[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(struct time_sup_read_only__))];
+ } r;
+ union {
+ struct time_sup_infrequently_changed__ c;
+ char align__[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(struct time_sup_infrequently_changed__))];
+ } inf;
+ union {
+ struct time_sup_frequently_changed__ c;
+ char align__[ERTS_ALC_CACHE_LINE_ALIGN_SIZE(sizeof(struct time_sup_frequently_changed__))];
+ } f;
+} time_sup erts_align_attribute(ERTS_CACHE_LINE_SIZE);
+
+ErtsTimeSupData erts_time_sup__ erts_align_attribute(ERTS_CACHE_LINE_SIZE);
+
+/*
+ * erts_get_approx_time() returns an *approximate* time
+ * in seconds. NOTE that this time may jump backwards!!!
+ */
+erts_approx_time_t
+erts_get_approx_time(void)
{
- erts_smp_atomic_init_nob(&approx.time, 0);
+ SysTimeval tv;
+ sys_gettimeofday(&tv);
+
+ return (erts_approx_time_t) tv.tv_sec;
}
-static ERTS_INLINE erts_approx_time_t
-get_approx_time(void)
+static ERTS_INLINE void
+init_time_offset(ErtsMonotonicTime offset)
{
- return (erts_approx_time_t) erts_smp_atomic_read_nob(&approx.time);
+ erts_atomic64_init_nob(&time_sup.inf.c.offset, (erts_aint64_t) offset);
}
static ERTS_INLINE void
-update_approx_time(SysTimeval *tv)
+set_time_offset(ErtsMonotonicTime offset)
{
- erts_approx_time_t new_secs = (erts_approx_time_t) tv->tv_sec;
- erts_approx_time_t old_secs = get_approx_time();
- if (old_secs != new_secs)
- erts_smp_atomic_set_nob(&approx.time, new_secs);
+ erts_atomic64_set_relb(&time_sup.inf.c.offset, (erts_aint64_t) offset);
}
-/*
- * erts_get_approx_time() returns an *approximate* time
- * in seconds. NOTE that this time may jump backwards!!!
- */
-erts_approx_time_t
-erts_get_approx_time(void)
+static ERTS_INLINE ErtsMonotonicTime
+get_time_offset(void)
{
- return get_approx_time();
+ return (ErtsMonotonicTime) erts_atomic64_read_acqb(&time_sup.inf.c.offset);
}
-#ifdef HAVE_GETHRTIME
-int erts_disable_tolerant_timeofday;
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+
+/*
+ * Time correction adjustments made due to
+ * error between Erlang system time and OS
+ * system time:
+ * - Large adjustment ~1%
+ * - Small adjustment ~0.05%
+ */
+#define ERTS_TCORR_ERR_UNIT 2048
+#define ERTS_TCORR_ERR_LARGE_ADJ 20
+#define ERTS_TCORR_ERR_SMALL_ADJ 1
-static SysHrTime hr_init_time, hr_last_correction_check,
- hr_correction, hr_last_time;
+#define ERTS_INIT_SHORT_INTERVAL_COUNTER 10
+#define ERTS_LONG_TIME_CORRECTION_CHECK ERTS_SEC_TO_MONOTONIC(60)
+#define ERTS_SHORT_TIME_CORRECTION_CHECK ERTS_SEC_TO_MONOTONIC(15)
-static void init_tolerant_timeofday(void)
+#define ERTS_TIME_DRIFT_MAX_ADJ_DIFF ERTS_USEC_TO_MONOTONIC(100)
+#define ERTS_TIME_DRIFT_MIN_ADJ_DIFF ERTS_USEC_TO_MONOTONIC(5)
+
+static ERTS_INLINE ErtsMonotonicTime
+calc_corrected_erl_mtime(ErtsMonotonicTime os_mtime,
+ ErtsMonotonicCorrectionInstance *cip,
+ ErtsMonotonicTime *os_mdiff_p)
{
- /* Should be in sys.c */
-#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_CONF)
- if (sysconf(_SC_NPROCESSORS_CONF) > 1) {
- char b[1024];
- int maj,min,build;
- os_flavor(b,1024);
- os_version(&maj,&min,&build);
- if (!strcmp(b,"sunos") && maj <= 5 && min <= 7) {
- erts_disable_tolerant_timeofday = 1;
- }
- }
+ ErtsMonotonicTime erl_mtime, diff = os_mtime - cip->os_mtime;
+ ERTS_TIME_ASSERT(diff >= 0);
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ diff += (cip->correction.drift*diff)/ERTS_MONOTONIC_TIME_UNIT;
#endif
- hr_init_time = sys_gethrtime();
- hr_last_correction_check = hr_last_time = hr_init_time;
- hr_correction = 0;
+ erl_mtime = cip->erl_mtime;
+ erl_mtime += diff;
+ erl_mtime += cip->correction.error*(diff/ERTS_TCORR_ERR_UNIT);
+ if (os_mdiff_p)
+ *os_mdiff_p = diff;
+ return erl_mtime;
}
-static void get_tolerant_timeofday(SysTimeval *tv)
+static ErtsMonotonicTime get_corrected_time(void)
{
- SysHrTime diff_time, curr;
+ ErtsMonotonicTime os_mtime;
+ ErtsMonotonicCorrectionData cdata;
+ ErtsMonotonicCorrectionInstance *cip;
+
+ erts_smp_rwmtx_rlock(&time_sup.inf.c.parmon.rwmtx);
+
+ os_mtime = erts_os_monotonic_time();
+
+ cdata = time_sup.inf.c.parmon.cdata;
- if (erts_disable_tolerant_timeofday) {
- sys_gettimeofday(tv);
- return;
+ erts_smp_rwmtx_runlock(&time_sup.inf.c.parmon.rwmtx);
+
+ if (os_mtime >= cdata.curr.os_mtime)
+ cip = &cdata.curr;
+ else {
+ if (os_mtime < cdata.prev.os_mtime)
+ erl_exit(ERTS_ABORT_EXIT,
+ "OS monotonic time stepped backwards\n");
+ cip = &cdata.prev;
}
- *tv = inittv;
- diff_time = ((curr = sys_gethrtime()) + hr_correction - hr_init_time) / 1000;
- if (curr < hr_init_time) {
- erl_exit(1,"Unexpected behaviour from operating system high "
- "resolution timer");
+ return calc_corrected_erl_mtime(os_mtime, cip, NULL);
+}
+
+static void
+check_time_correction(void *unused)
+{
+ ErtsMonotonicCorrectionData cdata;
+ ErtsMonotonicCorrection new_correction;
+ ErtsMonotonicCorrectionInstance *cip;
+ ErtsMonotonicTime mdiff, sdiff, os_mtime, erl_mtime, os_stime, erl_stime, time_offset;
+ Uint timeout;
+ SysTimeval tod;
+ int set_new_correction, begin_short_intervals = 0;
+
+ erts_smp_rwmtx_rlock(&time_sup.inf.c.parmon.rwmtx);
+
+ ASSERT(time_sup.inf.c.finalized_offset);
+
+ os_mtime = erts_os_monotonic_time();
+ sys_gettimeofday(&tod);
+
+ cdata = time_sup.inf.c.parmon.cdata;
+
+ erts_smp_rwmtx_runlock(&time_sup.inf.c.parmon.rwmtx);
+
+ if (os_mtime < cdata.curr.os_mtime)
+ erl_exit(ERTS_ABORT_EXIT,
+ "OS monotonic time stepped backwards\n");
+ cip = &cdata.curr;
+
+ erl_mtime = calc_corrected_erl_mtime(os_mtime, cip, &mdiff);
+ time_offset = get_time_offset();
+ erl_stime = erl_mtime + time_offset;
+
+ os_stime = ERTS_SEC_TO_MONOTONIC(tod.tv_sec);
+ os_stime += ERTS_USEC_TO_MONOTONIC(tod.tv_usec);
+
+ sdiff = erl_stime - os_stime;
+
+ new_correction = cip->correction;
+
+ if (time_sup.r.o.warp_mode == ERTS_MULTI_TIME_WARP_MODE
+ && (sdiff < -2*ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF
+ || 2*ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF < sdiff)) {
+ /* System time diff exeeded limits; change time offset... */
+ time_offset -= sdiff;
+ sdiff = 0;
+ set_time_offset(time_offset);
+ schedule_send_time_offset_changed_notifications(time_offset);
+ begin_short_intervals = 1;
+ if (cdata.curr.correction.error == 0)
+ set_new_correction = 0;
+ else {
+ set_new_correction = 1;
+ new_correction.error = 0;
+ }
+ }
+ else if (cdata.curr.correction.error == 0) {
+ if (sdiff < -ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF) {
+ set_new_correction = 1;
+ if (sdiff < -ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF)
+ new_correction.error = ERTS_TCORR_ERR_LARGE_ADJ;
+ else
+ new_correction.error = ERTS_TCORR_ERR_SMALL_ADJ;
+ }
+ else if (sdiff > ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF) {
+ set_new_correction = 1;
+ if (sdiff > ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF)
+ new_correction.error = -ERTS_TCORR_ERR_LARGE_ADJ;
+ else
+ new_correction.error = -ERTS_TCORR_ERR_SMALL_ADJ;
+ }
+ else {
+ set_new_correction = 0;
+ }
+ }
+ else if (cdata.curr.correction.error > 0) {
+ if (sdiff < 0) {
+ if (cdata.curr.correction.error == ERTS_TCORR_ERR_LARGE_ADJ
+ || -ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF <= sdiff)
+ set_new_correction = 0;
+ else {
+ new_correction.error = ERTS_TCORR_ERR_LARGE_ADJ;
+ set_new_correction = 1;
+ }
+ }
+ else if (sdiff > ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF) {
+ set_new_correction = 1;
+ if (sdiff > ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF)
+ new_correction.error = -ERTS_TCORR_ERR_LARGE_ADJ;
+ else
+ new_correction.error = -ERTS_TCORR_ERR_SMALL_ADJ;
+ }
+ else {
+ set_new_correction = 1;
+ new_correction.error = 0;
+ }
+ }
+ else /* if (cdata.curr.correction.error < 0) */ {
+ if (0 < sdiff) {
+ if (cdata.curr.correction.error == -ERTS_TCORR_ERR_LARGE_ADJ
+ || sdiff <= ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF)
+ set_new_correction = 0;
+ else {
+ new_correction.error = -ERTS_TCORR_ERR_LARGE_ADJ;
+ set_new_correction = 1;
+ }
+ set_new_correction = 0;
+ }
+ else if (sdiff < -ERTS_TIME_CORRECTION_SMALL_ADJ_DIFF) {
+ set_new_correction = 1;
+ if (sdiff < -ERTS_TIME_CORRECTION_LARGE_ADJ_DIFF)
+ new_correction.error = ERTS_TCORR_ERR_LARGE_ADJ;
+ else
+ new_correction.error = ERTS_TCORR_ERR_SMALL_ADJ;
+ }
+ else {
+ set_new_correction = 1;
+ new_correction.error = 0;
+ }
}
- if ((curr - hr_last_correction_check) / 1000 > 1000000) {
- /* Check the correction need */
- SysHrTime tv_diff, diffdiff;
- SysTimeval tmp;
- int done = 0;
-
- sys_gettimeofday(&tmp);
- tv_diff = ((SysHrTime) tmp.tv_sec) * 1000000 + tmp.tv_usec;
- tv_diff -= ((SysHrTime) inittv.tv_sec) * 1000000 + inittv.tv_usec;
- diffdiff = diff_time - tv_diff;
- if (diffdiff > 10000) {
- SysHrTime corr = (curr - hr_last_time) / 100;
- if (corr / 1000 >= diffdiff) {
- ++done;
- hr_correction -= ((SysHrTime)diffdiff) * 1000;
- } else {
- hr_correction -= corr;
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ {
+ ErtsMonotonicDriftData *ddp = &time_sup.inf.c.parmon.cdata.drift;
+ int ix = ddp->ix;
+ ErtsMonotonicTime mtime_diff, old_os_mtime;
+
+ old_os_mtime = ddp->intervals[ix].time.mon;
+ mtime_diff = os_mtime - old_os_mtime;
+
+ if (mtime_diff >= ERTS_SEC_TO_MONOTONIC(10)) {
+ ErtsMonotonicTime drift_adj, drift_adj_diff, old_os_stime,
+ stime_diff, mtime_acc, stime_acc, avg_drift_adj;
+
+ old_os_stime = ddp->intervals[ix].time.sys;
+
+ mtime_acc = ddp->acc.mon;
+ stime_acc = ddp->acc.sys;
+
+ avg_drift_adj = ((stime_acc - mtime_acc)*ERTS_MONOTONIC_TIME_UNIT) / mtime_acc;
+
+ mtime_diff = os_mtime - old_os_mtime;
+ stime_diff = os_stime - old_os_stime;
+ drift_adj = ((stime_diff - mtime_diff)*ERTS_MONOTONIC_TIME_UNIT) / mtime_diff;
+
+ ix++;
+ if (ix >= ERTS_DRIFT_INTERVALS)
+ ix = 0;
+ mtime_acc -= ddp->intervals[ix].diff.mon;
+ mtime_acc += mtime_diff;
+ stime_acc -= ddp->intervals[ix].diff.sys;
+ stime_acc += stime_diff;
+
+ ddp->intervals[ix].diff.mon = mtime_diff;
+ ddp->intervals[ix].diff.sys = stime_diff;
+ ddp->intervals[ix].time.mon = os_mtime;
+ ddp->intervals[ix].time.sys = os_stime;
+
+ ddp->ix = ix;
+ ddp->acc.mon = mtime_acc;
+ ddp->acc.sys = stime_acc;
+
+ /*
+ * If calculated drift adjustment is if off by more than 20% from the
+ * average drift we interpret this as a discontinous leap in system
+ * time and ignore it. If it actually is a change in drift we will
+ * later detect this when the average drift change.
+ */
+ drift_adj_diff = avg_drift_adj - drift_adj;
+ if (drift_adj_diff < -ERTS_TIME_DRIFT_MAX_ADJ_DIFF
+ || ERTS_TIME_DRIFT_MAX_ADJ_DIFF < drift_adj_diff) {
+ ddp->dirty_counter = ERTS_DRIFT_INTERVALS;
+ begin_short_intervals = 1;
}
- diff_time = (curr + hr_correction - hr_init_time) / 1000;
- } else if (diffdiff < -10000) {
- SysHrTime corr = (curr - hr_last_time) / 100;
- if (corr / 1000 >= -diffdiff) {
- ++done;
- hr_correction -= ((SysHrTime)diffdiff) * 1000;
- } else {
- hr_correction += corr;
+ else {
+ if (ddp->dirty_counter <= 0) {
+ drift_adj = ((stime_acc - mtime_acc)*ERTS_MONOTONIC_TIME_UNIT) / mtime_acc;
+ }
+ if (ddp->dirty_counter >= 0) {
+ if (ddp->dirty_counter == 0) {
+ /* Force set new drift correction... */
+ set_new_correction = 1;
+ }
+ ddp->dirty_counter--;
+ }
+ drift_adj_diff = drift_adj - new_correction.drift;
+ if (drift_adj_diff) {
+ if (drift_adj_diff > ERTS_TIME_DRIFT_MAX_ADJ_DIFF)
+ drift_adj_diff = ERTS_TIME_DRIFT_MAX_ADJ_DIFF;
+ else if (drift_adj_diff < -ERTS_TIME_DRIFT_MAX_ADJ_DIFF)
+ drift_adj_diff = -ERTS_TIME_DRIFT_MAX_ADJ_DIFF;
+ new_correction.drift += drift_adj_diff;
+
+ if (drift_adj_diff < -ERTS_TIME_DRIFT_MIN_ADJ_DIFF
+ || ERTS_TIME_DRIFT_MIN_ADJ_DIFF < drift_adj_diff) {
+ set_new_correction = 1;
+ }
+ }
}
- diff_time = (curr + hr_correction - hr_init_time) / 1000;
- } else {
- ++done;
}
- if (done) {
- hr_last_correction_check = curr;
+ }
+#endif
+
+ begin_short_intervals |= set_new_correction;
+
+ if (begin_short_intervals) {
+ time_sup.inf.c.parmon.cdata.short_check_interval
+ = ERTS_INIT_SHORT_INTERVAL_COUNTER;
+ }
+ else if ((os_mtime - time_sup.inf.c.parmon.cdata.last_check
+ >= ERTS_SHORT_TIME_CORRECTION_CHECK - ERTS_MONOTONIC_TIME_UNIT)
+ && time_sup.inf.c.parmon.cdata.short_check_interval > 0) {
+ time_sup.inf.c.parmon.cdata.short_check_interval--;
+ }
+ time_sup.inf.c.parmon.cdata.last_check = os_mtime;
+
+ if (new_correction.error == 0)
+ timeout = ERTS_MONOTONIC_TO_MSEC(ERTS_LONG_TIME_CORRECTION_CHECK);
+ else {
+ ErtsMonotonicTime ecorr = new_correction.error;
+ if (sdiff < 0)
+ sdiff = -1*sdiff;
+ if (ecorr < 0)
+ ecorr = -1*ecorr;
+ if (sdiff > ecorr*(ERTS_LONG_TIME_CORRECTION_CHECK/ERTS_TCORR_ERR_UNIT))
+ timeout = ERTS_MONOTONIC_TO_MSEC(ERTS_LONG_TIME_CORRECTION_CHECK);
+ else {
+ timeout = ERTS_MONOTONIC_TO_MSEC((ERTS_TCORR_ERR_UNIT*sdiff)/ecorr);
+ if (timeout < 10)
+ timeout = 10;
}
}
- tv->tv_sec += (int) (diff_time / ((SysHrTime) 1000000));
- tv->tv_usec += (int) (diff_time % ((SysHrTime) 1000000));
- if (tv->tv_usec >= 1000000) {
- tv->tv_usec -= 1000000;
- tv->tv_sec += 1;
+
+ if (timeout > ERTS_MONOTONIC_TO_MSEC(ERTS_SHORT_TIME_CORRECTION_CHECK)
+ && time_sup.inf.c.parmon.cdata.short_check_interval) {
+ timeout = ERTS_MONOTONIC_TO_MSEC(ERTS_SHORT_TIME_CORRECTION_CHECK);
}
- hr_last_time = curr;
-}
+
+ if (set_new_correction) {
+ erts_smp_rwmtx_rwlock(&time_sup.inf.c.parmon.rwmtx);
-#define correction (hr_correction/1000000)
+ os_mtime = erts_os_monotonic_time();
-#else /* !HAVE_GETHRTIME */
-#if !defined(CORRECT_USING_TIMES)
-#define init_tolerant_timeofday()
-#define get_tolerant_timeofday(tvp) sys_gettimeofday(tvp)
-#else
+ /* Save previous correction instance */
+ time_sup.inf.c.parmon.cdata.prev = *cip;
-typedef Sint64 Milli;
-
-static clock_t init_ct;
-static Sint64 ct_wrap;
-static Milli init_tv_m;
-static Milli correction_supress;
-static Milli last_ct_diff;
-static Milli last_cc;
-static clock_t last_ct;
-
-/* sys_times() might need to be wrapped and the values shifted (right)
- a bit to cope with newer linux (2.5.*) kernels, this has to be taken care
- of dynamically to start with, a special version that uses
- the times() return value as a high resolution timer can be made
- to fully utilize the faster ticks, like on windows, but for now, we'll
- settle with this silly workaround */
-#ifdef ERTS_WRAP_SYS_TIMES
-#define KERNEL_TICKS() (sys_times_wrap() & \
- ((1UL << ((sizeof(clock_t) * 8) - 1)) - 1))
-#else
-SysTimes dummy_tms;
+ /*
+ * Current correction instance begin when
+ * OS monotonic time has increased one unit.
+ */
+ os_mtime++;
-#define KERNEL_TICKS() (sys_times(&dummy_tms) & \
- ((1UL << ((sizeof(clock_t) * 8) - 1)) - 1))
+ /*
+ * Erlang monotonic time corresponding to
+ * next OS monotonic time using previous
+ * correction.
+ */
+ erl_mtime = calc_corrected_erl_mtime(os_mtime, cip, NULL);
-#endif
+ /*
+ * Save new current correction instance.
+ */
+ time_sup.inf.c.parmon.cdata.curr.erl_mtime = erl_mtime;
+ time_sup.inf.c.parmon.cdata.curr.os_mtime = os_mtime;
+ time_sup.inf.c.parmon.cdata.curr.correction = new_correction;
-static void init_tolerant_timeofday(void)
-{
- last_ct = init_ct = KERNEL_TICKS();
- last_cc = 0;
- init_tv_m = (((Milli) inittv.tv_sec) * 1000) +
- (inittv.tv_usec / 1000);
- ct_wrap = 0;
- correction_supress = 0;
+ erts_smp_rwmtx_rwunlock(&time_sup.inf.c.parmon.rwmtx);
+ }
+
+ erts_set_timer(&time_sup.inf.c.parmon.timer,
+ check_time_correction,
+ NULL,
+ NULL,
+ timeout);
}
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
-static void get_tolerant_timeofday(SysTimeval *tvp)
+static void
+init_check_time_correction(void *unused)
{
- clock_t current_ct;
- SysTimeval current_tv;
- Milli ct_diff;
- Milli tv_diff;
- Milli current_correction;
- Milli act_correction; /* long shown to be too small */
- Milli max_adjust;
-
- if (erts_disable_tolerant_timeofday) {
- sys_gettimeofday(tvp);
- return;
+ ErtsMonotonicDriftData *ddp;
+ ErtsMonotonicTime old_mtime, old_stime, mtime, stime, mtime_diff, stime_diff;
+ int ix;
+ SysTimeval tod;
+
+ ddp = &time_sup.inf.c.parmon.cdata.drift;
+ ix = ddp->ix;
+ old_mtime = ddp->intervals[0].time.mon;
+ old_stime = ddp->intervals[0].time.sys;
+
+ mtime = erts_os_monotonic_time();
+ sys_gettimeofday(&tod);
+
+ stime = ERTS_SEC_TO_MONOTONIC(tod.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(tod.tv_usec);
+
+ mtime_diff = mtime - old_mtime;
+ stime_diff = stime - old_stime;
+ if (100*stime_diff < 80*mtime_diff || 120*mtime_diff < 100*stime_diff ) {
+ /* Had a system time leap... pretend no drift... */
+ stime_diff = mtime_diff;
+ }
+
+ /*
+ * We use old time values in order to trigger
+ * a drift adjustment, and repeat this interval
+ * in all slots...
+ */
+ for (ix = 0; ix < ERTS_DRIFT_INTERVALS; ix++) {
+ ddp->intervals[ix].diff.mon = mtime_diff;
+ ddp->intervals[ix].diff.sys = stime_diff;
+ ddp->intervals[ix].time.mon = old_mtime;
+ ddp->intervals[ix].time.sys = old_stime;
}
-#ifdef ERTS_WRAP_SYS_TIMES
-#define TICK_MS (1000 / SYS_CLK_TCK_WRAP)
+ ddp->acc.sys = stime_diff*ERTS_DRIFT_INTERVALS;
+ ddp->acc.mon = mtime_diff*ERTS_DRIFT_INTERVALS;
+ ddp->ix = 0;
+ ddp->dirty_counter = ERTS_DRIFT_INTERVALS;
+
+ check_time_correction(NULL);
+}
+
+#endif
+
+static ErtsMonotonicTime
+finalize_corrected_time_offset(SysTimeval *todp)
+{
+ ErtsMonotonicTime os_mtime;
+ ErtsMonotonicCorrectionData cdata;
+ ErtsMonotonicCorrectionInstance *cip;
+
+ erts_smp_rwmtx_rlock(&time_sup.inf.c.parmon.rwmtx);
+
+ os_mtime = erts_os_monotonic_time();
+ sys_gettimeofday(todp);
+
+ cdata = time_sup.inf.c.parmon.cdata;
+
+ erts_smp_rwmtx_runlock(&time_sup.inf.c.parmon.rwmtx);
+
+ if (os_mtime < cdata.curr.os_mtime)
+ erl_exit(ERTS_ABORT_EXIT,
+ "OS monotonic time stepped backwards\n");
+ cip = &cdata.curr;
+
+ return calc_corrected_erl_mtime(os_mtime, cip, NULL);
+}
+
+static void
+late_init_time_correction(void)
+{
+ if (time_sup.inf.c.finalized_offset) {
+ erts_init_timer(&time_sup.inf.c.parmon.timer);
+ erts_set_timer(&time_sup.inf.c.parmon.timer,
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ init_check_time_correction,
#else
-#define TICK_MS (1000 / SYS_CLK_TCK)
+ check_time_correction,
#endif
- current_ct = KERNEL_TICKS();
- sys_gettimeofday(&current_tv);
-
- /* I dont know if uptime can move some units backwards
- on some systems, but I allow for small backward
- jumps to avoid such problems if they exist...*/
- if (last_ct > 100 && current_ct < (last_ct - 100)) {
- ct_wrap += ((Sint64) 1) << ((sizeof(clock_t) * 8) - 1);
+ NULL,
+ NULL,
+ ERTS_MONOTONIC_TO_MSEC(ERTS_SHORT_TIME_CORRECTION_CHECK));
}
- last_ct = current_ct;
- ct_diff = ((ct_wrap + current_ct) - init_ct) * TICK_MS;
+}
- /*
- * We will adjust the time in milliseconds and we allow for 1%
- * adjustments, but if this function is called more often then every 100
- * millisecond (which is obviously possible), we will never adjust, so
- * we accumulate small times by setting last_ct_diff iff max_adjust > 0
- */
- if ((max_adjust = (ct_diff - last_ct_diff)/100) > 0)
- last_ct_diff = ct_diff;
+#endif /* ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT */
- tv_diff = ((((Milli) current_tv.tv_sec) * 1000) +
- (current_tv.tv_usec / 1000)) - init_tv_m;
+static ErtsMonotonicTime get_not_corrected_time(void)
+{
+ SysTimeval tmp_tv;
+ ErtsMonotonicTime stime, mtime;
- current_correction = ((ct_diff - tv_diff) / TICK_MS) * TICK_MS; /* trunc */
+ erts_smp_mtx_lock(&erts_get_time_mtx);
- /*
- * We allow the current_correction value to wobble a little, as it
- * suffers from the low resolution of the kernel ticks.
- * if it hasn't changed more than one tick in either direction,
- * we will keep the old value.
- */
- if ((last_cc > current_correction + TICK_MS) ||
- (last_cc < current_correction - TICK_MS)) {
- last_cc = current_correction;
- } else {
- current_correction = last_cc;
- }
-
- /*
- * As time goes, we try to get the actual correction to 0,
- * that is, make erlangs time correspond to the systems dito.
- * The act correction is what we seem to need (current_correction)
- * minus the correction suppression. The correction supression
- * will change slowly (max 1% of elapsed time) but in millisecond steps.
- */
- act_correction = current_correction - correction_supress;
- if (max_adjust > 0) {
- /*
- * Here we slowly adjust erlangs time to correspond with the
- * system time by changing the correction_supress variable.
- * It can change max_adjust milliseconds which is 1% of elapsed time
- */
- if (act_correction > 0) {
- if (current_correction - correction_supress > max_adjust) {
- correction_supress += max_adjust;
- } else {
- correction_supress = current_correction;
- }
- act_correction = current_correction - correction_supress;
- } else if (act_correction < 0) {
- if (correction_supress - current_correction > max_adjust) {
- correction_supress -= max_adjust;
- } else {
- correction_supress = current_correction;
+ sys_gettimeofday(&tmp_tv);
+
+ stime = ERTS_SEC_TO_MONOTONIC(tmp_tv.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(tmp_tv.tv_usec);
+
+ mtime = stime - time_sup.inf.c.not_corrected_moffset;
+
+ if (mtime >= time_sup.f.c.last_not_corrected_time)
+ time_sup.f.c.last_not_corrected_time = mtime;
+ else {
+ mtime = time_sup.f.c.last_not_corrected_time;
+
+ if (time_sup.r.o.warp_mode == ERTS_MULTI_TIME_WARP_MODE) {
+ ErtsMonotonicTime new_offset = stime - mtime;
+ new_offset = ERTS_MONOTONIC_TO_USEC(new_offset);
+ new_offset = ERTS_USEC_TO_MONOTONIC(new_offset);
+ if (time_sup.inf.c.not_corrected_moffset != new_offset) {
+ time_sup.inf.c.not_corrected_moffset = new_offset;
+ set_time_offset(new_offset);
+ schedule_send_time_offset_changed_notifications(new_offset);
}
- act_correction = current_correction - correction_supress;
}
+
}
- /*
- * The actual correction will correct the timeval so that system
- * time warps gets smothed down.
- */
- current_tv.tv_sec += act_correction / 1000;
- current_tv.tv_usec += (act_correction % 1000) * 1000;
-
- if (current_tv.tv_usec >= 1000000) {
- ++current_tv.tv_sec ;
- current_tv.tv_usec -= 1000000;
- } else if (current_tv.tv_usec < 0) {
- --current_tv.tv_sec;
- current_tv.tv_usec += 1000000;
- }
- *tvp = current_tv;
-#undef TICK_MS
+
+ ASSERT(stime == mtime + time_sup.inf.c.not_corrected_moffset);
+
+ erts_smp_mtx_unlock(&erts_get_time_mtx);
+
+ return mtime;
}
-#endif /* CORRECT_USING_TIMES */
-#endif /* !HAVE_GETHRTIME */
+int erts_check_time_adj_support(int time_correction,
+ ErtsTimeWarpMode time_warp_mode)
+{
+ if (!time_correction)
+ return 1;
-/*
-** Why this? Well, most platforms have a constant clock resolution of 1,
-** we dont want the deliver_time/time_remaining routines to waste
-** time dividing and multiplying by/with a variable that's always one.
-** so the return value of sys_init_time is ignored on those platforms.
-*/
-
-#ifndef SYS_CLOCK_RESOLUTION
-static int clock_resolution;
-#define CLOCK_RESOLUTION clock_resolution
+ /* User wants time correction */
+
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ return !time_sup.r.o.os_monotonic_disable;
#else
-#define CLOCK_RESOLUTION SYS_CLOCK_RESOLUTION
+ return 0;
#endif
+}
-/*
-** The clock resolution should really be the resolution of the
-** time function in use, which on most platforms
-** is 1. On VxWorks the resolution should be
-** the number of ticks per second (or 1, which would work nicely to).
-**
-** Setting lower resolutions is mostly interesting when timers are used
-** instead of something like select.
-*/
-
-static SysTimeval last_delivered;
-
-static void init_erts_deliver_time(const SysTimeval *inittv)
+int
+erts_has_time_correction(void)
{
- /* We set the initial values for deliver_time here */
- last_delivered = *inittv;
- last_delivered.tv_usec = 1000 * (last_delivered.tv_usec / 1000);
- /* ms resolution */
+ return time_sup.r.o.correction;
}
-static void do_erts_deliver_time(const SysTimeval *current)
+void
+erts_early_init_time_sup(void)
{
- SysTimeval cur_time;
- erts_time_t elapsed;
-
- /* calculate and deliver appropriate number of ticks */
- cur_time = *current;
- cur_time.tv_usec = 1000 * (cur_time.tv_usec / 1000); /* ms resolution */
- elapsed = (1000 * (cur_time.tv_sec - last_delivered.tv_sec) +
- (cur_time.tv_usec - last_delivered.tv_usec) / 1000) /
- CLOCK_RESOLUTION;
+ ErtsSysInitTimeResult sys_init_time_res
+ = ERTS_SYS_INIT_TIME_RESULT_INITER;
- /* Sometimes the time jump backwards,
- resulting in a negative elapsed time. We compensate for
- this by simply pretend as if the time stood still. :) */
+ sys_init_time(&sys_init_time_res);
- if (elapsed > 0) {
+ erts_time_sup__.r.o.monotonic_time_unit
+ = sys_init_time_res.os_monotonic_time_unit;
- ASSERT(elapsed < ((erts_time_t) ERTS_SHORT_TIME_T_MAX));
+#ifndef SYS_CLOCK_RESOLUTION
+ erts_time_sup__.r.o.clktck_resolution
+ = sys_init_time_res.sys_clock_resolution;
+ erts_time_sup__.r.o.clktck_resolution *= 1000;
+#endif
- erts_do_time_add((erts_short_time_t) elapsed);
- last_delivered = cur_time;
- }
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ time_sup.r.o.os_monotonic_disable
+ = !sys_init_time_res.have_os_monotonic;
+ time_sup.r.o.os_monotonic_func
+ = sys_init_time_res.os_monotonic_info.func;
+ time_sup.r.o.os_monotonic_clock_id
+ = sys_init_time_res.os_monotonic_info.clock_id;
+ time_sup.r.o.os_monotonic_locked
+ = sys_init_time_res.os_monotonic_info.locked_use;
+ time_sup.r.o.os_monotonic_resolution
+ = sys_init_time_res.os_monotonic_info.resolution;
+#endif
}
int
-erts_init_time_sup(void)
+erts_init_time_sup(int time_correction, ErtsTimeWarpMode time_warp_mode)
{
+#if !ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT
+ ErtsMonotonicTime abs_start;
+#endif
+
+ ASSERT(ERTS_MONOTONIC_TIME_MIN < ERTS_MONOTONIC_TIME_MAX);
+
erts_smp_mtx_init(&erts_timeofday_mtx, "timeofday");
+ erts_smp_mtx_init(&erts_get_time_mtx, "get_time");
- init_approx_time();
+ time_sup.r.o.correction = time_correction;
+ time_sup.r.o.warp_mode = time_warp_mode;
+
+ if (time_warp_mode == ERTS_SINGLE_TIME_WARP_MODE)
+ time_sup.inf.c.finalized_offset = 0;
+ else
+ time_sup.inf.c.finalized_offset = ~0;
+
+#if !ERTS_COMPILE_TIME_MONOTONIC_TIME_UNIT
+
+#ifdef ARCH_32
+ time_sup.r.o.start = ((((ErtsMonotonicTime) 1) << 32)-1);
+ time_sup.r.o.start /= ERTS_MONOTONIC_TIME_UNIT;
+ time_sup.r.o.start *= ERTS_MONOTONIC_TIME_UNIT;
+ time_sup.r.o.start += ERTS_MONOTONIC_TIME_UNIT;
+ abs_start = time_sup.r.o.start;
+#else /* ARCH_64 */
+ if (ERTS_MONOTONIC_TIME_UNIT <= 1000*1000)
+ abs_start = time_sup.r.o.start = 0;
+ else {
+ time_sup.r.o.start = ((ErtsMonotonicTime) MIN_SMALL);
+ time_sup.r.o.start /= ERTS_MONOTONIC_TIME_UNIT;
+ time_sup.r.o.start *= ERTS_MONOTONIC_TIME_UNIT;
+ abs_start = -1*time_sup.r.o.start;
+ }
+#endif
- last_emu_time.tv_sec = 0;
- last_emu_time.tv_usec = 0;
+ time_sup.r.o.start_offset.native = time_sup.r.o.start;
+ time_sup.r.o.start_offset.nsec = (ErtsMonotonicTime)
+ erts_time_unit_conversion((Uint64) abs_start,
+ (Uint32) ERTS_MONOTONIC_TIME_UNIT,
+ (Uint32) 1000*1000*1000);
+ time_sup.r.o.start_offset.usec = (ErtsMonotonicTime)
+ erts_time_unit_conversion((Uint64) abs_start,
+ (Uint32) ERTS_MONOTONIC_TIME_UNIT,
+ (Uint32) 1000*1000);
+ time_sup.r.o.start_offset.msec = (ErtsMonotonicTime)
+ erts_time_unit_conversion((Uint64) abs_start,
+ (Uint32) ERTS_MONOTONIC_TIME_UNIT,
+ (Uint32) 1000);
+ time_sup.r.o.start_offset.sec = (ErtsMonotonicTime)
+ erts_time_unit_conversion((Uint64) abs_start,
+ (Uint32) ERTS_MONOTONIC_TIME_UNIT,
+ (Uint32) 1);
+ if (time_sup.r.o.start < 0) {
+ time_sup.r.o.start_offset.nsec *= -1;
+ time_sup.r.o.start_offset.usec *= -1;
+ time_sup.r.o.start_offset.msec *= -1;
+ time_sup.r.o.start_offset.sec *= -1;
+ }
-#ifndef SYS_CLOCK_RESOLUTION
- clock_resolution = sys_init_time();
-#else
- (void) sys_init_time();
#endif
- sys_gettimeofday(&inittv);
+
+ if (ERTS_MONOTONIC_TIME_UNIT < ERTS_CLKTCK_RESOLUTION)
+ ERTS_INTERNAL_ERROR("Too small monotonic time time unit");
+
+#ifndef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ time_sup.r.o.correction = 0;
+#else
+ if (time_sup.r.o.os_monotonic_disable)
+ time_sup.r.o.correction = 0;
+
+ if (time_sup.r.o.correction) {
+ ErtsMonotonicCorrectionData *cdatap;
+ erts_smp_rwmtx_opt_t rwmtx_opts = ERTS_SMP_RWMTX_OPT_DEFAULT_INITER;
+ ErtsMonotonicTime offset;
+ time_sup.inf.c.minit = erts_os_monotonic_time();
+ sys_gettimeofday(&time_sup.inf.c.inittv);
+ time_sup.r.o.moffset = -1*time_sup.inf.c.minit;
+ offset = ERTS_SEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_sec);
+ offset += ERTS_USEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_usec);
+ init_time_offset(offset);
+
+ rwmtx_opts.type = ERTS_SMP_RWMTX_TYPE_EXTREMELY_FREQUENT_READ;
+ rwmtx_opts.lived = ERTS_SMP_RWMTX_LONG_LIVED;
+
+ erts_smp_rwmtx_init_opt(&time_sup.inf.c.parmon.rwmtx,
+ &rwmtx_opts, "get_corrected_time");
+
+ cdatap = &time_sup.inf.c.parmon.cdata;
-#ifdef HAVE_GETHRTIME
- sys_init_hrtime();
+#ifndef ERTS_HAVE_CORRECTED_OS_MONOTONIC
+ cdatap->drift.intervals[0].time.sys
+ = ERTS_SEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_sec);
+ cdatap->drift.intervals[0].time.sys
+ += ERTS_USEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_usec);
+ cdatap->drift.intervals[0].time.mon = time_sup.inf.c.minit;
+ cdatap->curr.correction.drift = 0;
+#endif
+ cdatap->curr.correction.error = 0;
+ cdatap->curr.erl_mtime = 0;
+ cdatap->curr.os_mtime = time_sup.inf.c.minit;
+ cdatap->last_check = time_sup.inf.c.minit;
+ cdatap->short_check_interval = ERTS_INIT_SHORT_INTERVAL_COUNTER;
+ cdatap->prev = cdatap->curr;
+
+ time_sup.r.o.get_time = get_corrected_time;
+ }
+ else
#endif
- init_tolerant_timeofday();
+ {
+ ErtsMonotonicTime stime, offset;
+ time_sup.r.o.get_time = get_not_corrected_time;
+ stime = ERTS_SEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(time_sup.inf.c.inittv.tv_usec);
+ offset = stime;
+ time_sup.inf.c.not_corrected_moffset = offset;
+ init_time_offset(offset);
+ time_sup.f.c.last_not_corrected_time = 0;
+ }
+
+ prev_wall_clock_elapsed = 0;
- init_erts_deliver_time(&inittv);
- gtv = inittv;
- then.tv_sec = then.tv_usec = 0;
+ previous_now = ERTS_MONOTONIC_TO_USEC(get_time_offset());
- erts_deliver_time();
+#ifdef DEBUG
+ time_sup_initialized = 1;
+#endif
- return CLOCK_RESOLUTION;
+ return ERTS_CLKTCK_RESOLUTION/1000;
}
+
+void
+erts_late_init_time_sup(void)
+{
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ /* Timer wheel must be initialized */
+ if (time_sup.r.o.get_time == get_corrected_time)
+ late_init_time_correction();
+#endif
+}
+
+ErtsTimeWarpMode erts_time_warp_mode(void)
+{
+ return time_sup.r.o.warp_mode;
+}
+
+ErtsTimeOffsetState erts_time_offset_state(void)
+{
+ switch (time_sup.r.o.warp_mode) {
+ case ERTS_NO_TIME_WARP_MODE:
+ return ERTS_TIME_OFFSET_FINAL;
+ case ERTS_SINGLE_TIME_WARP_MODE:
+ if (time_sup.inf.c.finalized_offset)
+ return ERTS_TIME_OFFSET_FINAL;
+ return ERTS_TIME_OFFSET_PRELIMINARY;
+ case ERTS_MULTI_TIME_WARP_MODE:
+ return ERTS_TIME_OFFSET_VOLATILE;
+ default:
+ ERTS_INTERNAL_ERROR("Invalid time warp mode");
+ return ERTS_TIME_OFFSET_VOLATILE;
+ }
+}
+
+/*
+ * erts_finalize_time_offset() will only change time offset
+ * the first time it is called when the emulator has been
+ * started in "single time warp" mode. Returns previous
+ * state:
+ * * ERTS_TIME_OFFSET_PRELIMINARY - Finalization performed
+ * * ERTS_TIME_OFFSET_FINAL - Already finialized; nothing changed
+ * * ERTS_TIME_OFFSET_VOLATILE - Not supported, either in
+ * * no correction mode (or multi time warp mode; not yet implemented).
+ */
+
+ErtsTimeOffsetState
+erts_finalize_time_offset(void)
+{
+ switch (time_sup.r.o.warp_mode) {
+ case ERTS_NO_TIME_WARP_MODE:
+ return ERTS_TIME_OFFSET_FINAL;
+ case ERTS_MULTI_TIME_WARP_MODE:
+ return ERTS_TIME_OFFSET_VOLATILE;
+ case ERTS_SINGLE_TIME_WARP_MODE: {
+ ErtsTimeOffsetState res = ERTS_TIME_OFFSET_FINAL;
+
+ erts_smp_mtx_lock(&erts_get_time_mtx);
+
+ if (!time_sup.inf.c.finalized_offset) {
+ ErtsMonotonicTime mtime, new_offset;
+ SysTimeval tv;
+
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ if (!time_sup.r.o.correction)
+#endif
+ {
+ ErtsMonotonicTime stime;
+ sys_gettimeofday(&tv);
+
+ stime = ERTS_SEC_TO_MONOTONIC(tv.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(tv.tv_usec);
+
+ mtime = stime - time_sup.inf.c.not_corrected_moffset;
+
+ if (mtime >= time_sup.f.c.last_not_corrected_time) {
+ time_sup.f.c.last_not_corrected_time = mtime;
+ new_offset = time_sup.inf.c.not_corrected_moffset;
+ }
+ else {
+ mtime = time_sup.f.c.last_not_corrected_time;
+
+ ASSERT(time_sup.inf.c.not_corrected_moffset != stime - mtime);
+ new_offset = stime - mtime;
+ time_sup.inf.c.not_corrected_moffset = new_offset;
+ }
+
+ }
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ else {
+ mtime = finalize_corrected_time_offset(&tv);
+ new_offset = ERTS_SEC_TO_MONOTONIC(tv.tv_sec);
+ new_offset += ERTS_USEC_TO_MONOTONIC(tv.tv_usec);
+ new_offset -= mtime;
+
+ }
+#endif
+ new_offset = ERTS_MONOTONIC_TO_USEC(new_offset);
+ new_offset = ERTS_USEC_TO_MONOTONIC(new_offset);
+
+ set_time_offset(new_offset);
+ schedule_send_time_offset_changed_notifications(new_offset);
+
+ time_sup.inf.c.finalized_offset = ~0;
+ res = ERTS_TIME_OFFSET_PRELIMINARY;
+ }
+
+ erts_smp_mtx_unlock(&erts_get_time_mtx);
+
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ if (res == ERTS_TIME_OFFSET_PRELIMINARY
+ && time_sup.r.o.get_time == get_corrected_time) {
+ late_init_time_correction();
+ }
+#endif
+
+ return res;
+ }
+ default:
+ ERTS_INTERNAL_ERROR("Invalid time warp mode");
+ return ERTS_TIME_OFFSET_VOLATILE;
+ }
+}
+
/* info functions */
void
@@ -498,23 +1091,16 @@ elapsed_time_both(UWord *ms_user, UWord *ms_sys,
void
wall_clock_elapsed_time_both(UWord *ms_total, UWord *ms_diff)
{
- UWord prev_total;
- SysTimeval tv;
+ ErtsMonotonicTime now, elapsed;
erts_smp_mtx_lock(&erts_timeofday_mtx);
- get_tolerant_timeofday(&tv);
-
- *ms_total = 1000 * (tv.tv_sec - inittv.tv_sec) +
- (tv.tv_usec - inittv.tv_usec) / 1000;
+ now = time_sup.r.o.get_time();
- prev_total = 1000 * (gtv.tv_sec - inittv.tv_sec) +
- (gtv.tv_usec - inittv.tv_usec) / 1000;
- *ms_diff = *ms_total - prev_total;
- gtv = tv;
-
- /* must sync the machine's idea of time here */
- do_erts_deliver_time(&tv);
+ elapsed = ERTS_MONOTONIC_TO_MSEC(now);
+ *ms_total = (UWord) elapsed;
+ *ms_diff = (UWord) (elapsed - prev_wall_clock_elapsed);
+ prev_wall_clock_elapsed = elapsed;
erts_smp_mtx_unlock(&erts_timeofday_mtx);
}
@@ -890,38 +1476,41 @@ univ_to_local(Sint *year, Sint *month, Sint *day,
return 0;
}
-
/* get a timestamp */
void
get_now(Uint* megasec, Uint* sec, Uint* microsec)
{
- SysTimeval now;
+ ErtsMonotonicTime now_megasec, now_sec, now, mtime, time_offset;
+ mtime = time_sup.r.o.get_time();
+ time_offset = get_time_offset();
+ now = ERTS_MONOTONIC_TO_USEC(mtime + time_offset);
+
erts_smp_mtx_lock(&erts_timeofday_mtx);
-
- get_tolerant_timeofday(&now);
- do_erts_deliver_time(&now);
-
- /* Make sure time is later than last */
- if (then.tv_sec > now.tv_sec ||
- (then.tv_sec == now.tv_sec && then.tv_usec >= now.tv_usec)) {
- now = then;
- now.tv_usec++;
- }
- /* Check for carry from above + general reasonability */
- if (now.tv_usec >= 1000000) {
- now.tv_usec = 0;
- now.tv_sec++;
- }
- then = now;
+
+ /* Make sure now time is later than last time */
+ if (now <= previous_now)
+ now = previous_now + 1;
+
+ previous_now = now;
erts_smp_mtx_unlock(&erts_timeofday_mtx);
-
- *megasec = (Uint) (now.tv_sec / 1000000);
- *sec = (Uint) (now.tv_sec % 1000000);
- *microsec = (Uint) (now.tv_usec);
- update_approx_time(&now);
+ now_megasec = now / ERTS_MONOTONIC_TIME_TERA;
+ now_sec = now / ERTS_MONOTONIC_TIME_MEGA;
+ *megasec = (Uint) now_megasec;
+ *sec = (Uint) (now_sec - now_megasec*ERTS_MONOTONIC_TIME_MEGA);
+ *microsec = (Uint) (now - now_sec*ERTS_MONOTONIC_TIME_MEGA);
+
+ ASSERT(((ErtsMonotonicTime) *megasec)*ERTS_MONOTONIC_TIME_TERA
+ + ((ErtsMonotonicTime) *sec)*ERTS_MONOTONIC_TIME_MEGA
+ + ((ErtsMonotonicTime) *microsec) == now);
+}
+
+ErtsMonotonicTime
+erts_get_monotonic_time(void)
+{
+ return time_sup.r.o.get_time();
}
void
@@ -934,102 +1523,466 @@ get_sys_now(Uint* megasec, Uint* sec, Uint* microsec)
*megasec = (Uint) (now.tv_sec / 1000000);
*sec = (Uint) (now.tv_sec % 1000000);
*microsec = (Uint) (now.tv_usec);
-
- update_approx_time(&now);
}
+#ifdef HAVE_ERTS_NOW_CPU
+void erts_get_now_cpu(Uint* megasec, Uint* sec, Uint* microsec) {
+ SysCpuTime t;
+ SysTimespec tp;
-/* deliver elapsed *ticks* to the machine - takes a pointer
- to a struct timeval representing current time (to save
- a gettimeofday() where possible) or NULL */
+ sys_get_proc_cputime(t, tp);
+ *microsec = (Uint)(tp.tv_nsec / 1000);
+ t = (tp.tv_sec / 1000000);
+ *megasec = (Uint)(t % 1000000);
+ *sec = (Uint)(tp.tv_sec % 1000000);
+}
+#endif
-void erts_deliver_time(void) {
- SysTimeval now;
-
- erts_smp_mtx_lock(&erts_timeofday_mtx);
-
- get_tolerant_timeofday(&now);
- do_erts_deliver_time(&now);
-
- erts_smp_mtx_unlock(&erts_timeofday_mtx);
+#include "big.h"
- update_approx_time(&now);
+void
+erts_monitor_time_offset(Eterm id, Eterm ref)
+{
+ erts_smp_mtx_lock(&erts_get_time_mtx);
+ erts_add_monitor(&time_offset_monitors, MON_TIME_OFFSET, ref, id, NIL);
+ no_time_offset_monitors++;
+ erts_smp_mtx_unlock(&erts_get_time_mtx);
}
-/* get *real* time (not ticks) remaining until next timeout - if there
- isn't one, give a "long" time, that is guaranteed
- to not cause overflow when we report elapsed time later on */
+int
+erts_demonitor_time_offset(Eterm ref)
+{
+ int res;
+ ErtsMonitor *mon;
+ ASSERT(is_internal_ref(ref));
+ erts_smp_mtx_lock(&erts_get_time_mtx);
+ mon = erts_remove_monitor(&time_offset_monitors, ref);
+ if (!mon)
+ res = 0;
+ else {
+ ASSERT(no_time_offset_monitors > 0);
+ no_time_offset_monitors--;
+ res = 1;
+ }
+ erts_smp_mtx_unlock(&erts_get_time_mtx);
+ if (res)
+ erts_destroy_monitor(mon);
+ return res;
+}
-void erts_time_remaining(SysTimeval *rem_time)
+typedef struct {
+ Eterm pid;
+ Eterm ref;
+ Eterm heap[REF_THING_SIZE];
+} ErtsTimeOffsetMonitorInfo;
+
+typedef struct {
+ Uint ix;
+ ErtsTimeOffsetMonitorInfo *to_mon_info;
+} ErtsTimeOffsetMonitorContext;
+
+static void
+save_time_offset_monitor(ErtsMonitor *mon, void *vcntxt)
{
- erts_time_t ticks;
- SysTimeval cur_time;
- erts_time_t elapsed;
-
- /* erts_next_time() returns no of ticks to next timeout or -1 if none */
-
- ticks = (erts_time_t) erts_next_time();
- if (ticks == (erts_time_t) -1) {
- /* timer queue empty */
- /* this will cause at most 100000000 ticks */
- rem_time->tv_sec = 100000;
- rem_time->tv_usec = 0;
- } else {
- /* next timeout after ticks ticks */
- ticks *= CLOCK_RESOLUTION;
-
- erts_smp_mtx_lock(&erts_timeofday_mtx);
-
- get_tolerant_timeofday(&cur_time);
- cur_time.tv_usec = 1000 *
- (cur_time.tv_usec / 1000);/* ms resolution*/
- elapsed = 1000 * (cur_time.tv_sec - last_delivered.tv_sec) +
- (cur_time.tv_usec - last_delivered.tv_usec) / 1000;
-
- erts_smp_mtx_unlock(&erts_timeofday_mtx);
+ ErtsTimeOffsetMonitorContext *cntxt;
+ Eterm *from_hp, *to_hp;
+ Uint mix;
+ int hix;
+
+ cntxt = (ErtsTimeOffsetMonitorContext *) vcntxt;
+ mix = (cntxt->ix)++;
+ cntxt->to_mon_info[mix].pid = mon->pid;
+ to_hp = &cntxt->to_mon_info[mix].heap[0];
+
+ ASSERT(is_internal_ref(mon->ref));
+ from_hp = internal_ref_val(mon->ref);
+ ASSERT(thing_arityval(*from_hp) + 1 == REF_THING_SIZE);
+
+ for (hix = 0; hix < REF_THING_SIZE; hix++)
+ to_hp[hix] = from_hp[hix];
+
+ cntxt->to_mon_info[mix].ref
+ = make_internal_ref(&cntxt->to_mon_info[mix].heap[0]);
+
+}
+
+static void
+send_time_offset_changed_notifications(void *new_offsetp)
+{
+ ErtsMonotonicTime new_offset;
+ ErtsTimeOffsetMonitorInfo *to_mon_info;
+ Uint no_monitors;
+ char *tmp = NULL;
+
+#ifdef ARCH_64
+ new_offset = (ErtsMonotonicTime) new_offsetp;
+#else
+ new_offset = *((ErtsMonotonicTime *) new_offsetp);
+ erts_free(ERTS_ALC_T_NEW_TIME_OFFSET, new_offsetp);
+#endif
+ new_offset -= ERTS_MONOTONIC_OFFSET_NATIVE;
+
+ erts_smp_mtx_lock(&erts_get_time_mtx);
+
+ no_monitors = no_time_offset_monitors;
+ if (no_monitors) {
+ ErtsTimeOffsetMonitorContext cntxt;
+ Uint alloc_sz;
- if (ticks <= elapsed) { /* Ooops, better hurry */
- rem_time->tv_sec = rem_time->tv_usec = 0;
- return;
+ /* Monitor info array size */
+ alloc_sz = no_monitors*sizeof(ErtsTimeOffsetMonitorInfo);
+ /* + template max size */
+ alloc_sz += 6*sizeof(Eterm); /* 5-tuple */
+ alloc_sz += ERTS_MAX_SINT64_HEAP_SIZE*sizeof(Eterm); /* max offset size */
+ tmp = erts_alloc(ERTS_ALC_T_TMP, alloc_sz);
+
+ to_mon_info = (ErtsTimeOffsetMonitorInfo *) tmp;
+ cntxt.ix = 0;
+ cntxt.to_mon_info = to_mon_info;
+
+ erts_doforall_monitors(time_offset_monitors,
+ save_time_offset_monitor,
+ &cntxt);
+
+ ASSERT(cntxt.ix == no_monitors);
+ }
+
+ erts_smp_mtx_unlock(&erts_get_time_mtx);
+
+ if (no_monitors) {
+ Eterm *hp, *patch_refp, new_offset_term, message_template;
+ Uint mix, hsz;
+
+ /* Make message template */
+
+ hp = (Eterm *) (tmp + no_monitors*sizeof(ErtsTimeOffsetMonitorInfo));
+
+ hsz = 6; /* 5-tuple */
+ hsz += REF_THING_SIZE;
+ hsz += ERTS_SINT64_HEAP_SIZE(new_offset);
+
+ if (IS_SSMALL(new_offset))
+ new_offset_term = make_small(new_offset);
+ else
+ new_offset_term = erts_sint64_to_big(new_offset, &hp);
+ message_template = TUPLE5(hp,
+ am_CHANGE,
+ THE_NON_VALUE, /* Patch point for ref */
+ am_time_offset,
+ am_clock_service,
+ new_offset_term);
+ patch_refp = &hp[2];
+
+ ASSERT(*patch_refp == THE_NON_VALUE);
+
+ for (mix = 0; mix < no_monitors; mix++) {
+ Process *rp = erts_proc_lookup(to_mon_info[mix].pid);
+ if (rp) {
+ Eterm ref = to_mon_info[mix].ref;
+ ErtsProcLocks rp_locks = ERTS_PROC_LOCK_LINK;
+ erts_smp_proc_lock(rp, ERTS_PROC_LOCK_LINK);
+ if (erts_lookup_monitor(ERTS_P_MONITORS(rp), ref)) {
+ ErlHeapFragment *bp;
+ ErlOffHeap *ohp;
+ Eterm message;
+
+ hp = erts_alloc_message_heap(hsz, &bp, &ohp, rp, &rp_locks);
+ *patch_refp = ref;
+ ASSERT(hsz == size_object(message_template));
+ message = copy_struct(message_template, hsz, &hp, ohp);
+ erts_queue_message(rp, &rp_locks, bp, message, NIL
+#ifdef USE_VM_PROBES
+ , NIL
+#endif
+ );
+ }
+ erts_smp_proc_unlock(rp, rp_locks);
+ }
}
- rem_time->tv_sec = (ticks - elapsed) / 1000;
- rem_time->tv_usec = 1000 * ((ticks - elapsed) % 1000);
+
+ erts_free(ERTS_ALC_T_TMP, tmp);
}
}
-void erts_get_timeval(SysTimeval *tv)
+static void
+schedule_send_time_offset_changed_notifications(ErtsMonotonicTime new_offset)
{
- erts_smp_mtx_lock(&erts_timeofday_mtx);
- get_tolerant_timeofday(tv);
- erts_smp_mtx_unlock(&erts_timeofday_mtx);
- update_approx_time(tv);
+#ifdef ARCH_64
+ void *new_offsetp = (void *) new_offset;
+ ASSERT(sizeof(void *) == sizeof(ErtsMonotonicTime));
+#else
+ void *new_offsetp = erts_alloc(ERTS_ALC_T_NEW_TIME_OFFSET,
+ sizeof(ErtsMonotonicTime));
+ *((ErtsMonotonicTime *) new_offsetp) = new_offset;
+#endif
+ erts_schedule_misc_aux_work(1,
+ send_time_offset_changed_notifications,
+ new_offsetp);
}
-erts_time_t
-erts_get_time(void)
+static ERTS_INLINE Eterm
+make_time_val(Process *c_p, ErtsMonotonicTime time_val)
{
- SysTimeval sys_tv;
-
- erts_smp_mtx_lock(&erts_timeofday_mtx);
-
- get_tolerant_timeofday(&sys_tv);
-
- erts_smp_mtx_unlock(&erts_timeofday_mtx);
+ Sint64 val = (Sint64) time_val;
+ Eterm *hp;
+ Uint sz;
- update_approx_time(&sys_tv);
+ if (IS_SSMALL(val))
+ return make_small(val);
- return sys_tv.tv_sec;
+ sz = ERTS_SINT64_HEAP_SIZE(val);
+ hp = HAlloc(c_p, sz);
+ return erts_sint64_to_big(val, &hp);
}
-#ifdef HAVE_ERTS_NOW_CPU
-void erts_get_now_cpu(Uint* megasec, Uint* sec, Uint* microsec) {
- SysCpuTime t;
- SysTimespec tp;
+Eterm
+erts_get_monotonic_start_time(struct process *c_p)
+{
+ return make_time_val(c_p, ERTS_MONOTONIC_OFFSET_NATIVE);
+}
- sys_get_proc_cputime(t, tp);
- *microsec = (Uint)(tp.tv_nsec / 1000);
- t = (tp.tv_sec / 1000000);
- *megasec = (Uint)(t % 1000000);
- *sec = (Uint)(tp.tv_sec % 1000000);
+static Eterm
+bld_monotonic_time_source(Uint **hpp, Uint *szp, Sint64 os_mtime)
+{
+#ifndef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ return NIL;
+#else
+ int i = 0;
+ Eterm k[5];
+ Eterm v[5];
+
+ if (time_sup.r.o.os_monotonic_disable)
+ return NIL;
+
+ k[i] = erts_bld_atom(hpp, szp, "function");
+ v[i++] = erts_bld_atom(hpp, szp, time_sup.r.o.os_monotonic_func);
+
+ if (time_sup.r.o.os_monotonic_clock_id) {
+ k[i] = erts_bld_atom(hpp, szp, "clock_id");
+ v[i++] = erts_bld_atom(hpp, szp, time_sup.r.o.os_monotonic_clock_id);
+ }
+
+ if (time_sup.r.o.os_monotonic_resolution) {
+ k[i] = erts_bld_atom(hpp, szp, "resolution");
+ v[i++] = erts_bld_uint64(hpp, szp, time_sup.r.o.os_monotonic_resolution);
+ }
+
+ k[i] = erts_bld_atom(hpp, szp, "parallel");
+ v[i++] = time_sup.r.o.os_monotonic_locked ? am_no : am_yes;
+
+ k[i] = erts_bld_atom(hpp, szp, "time");
+ v[i++] = erts_bld_sint64(hpp, szp, os_mtime);
+
+ return erts_bld_2tup_list(hpp, szp, (Sint) i, k, v);
+#endif
}
+
+Eterm
+erts_monotonic_time_source(struct process *c_p)
+{
+ Uint hsz = 0;
+ Eterm *hp = NULL;
+ Sint64 os_mtime = 0;
+#ifdef ERTS_HAVE_OS_MONOTONIC_TIME_SUPPORT
+ if (!time_sup.r.o.os_monotonic_disable)
+ os_mtime = (Sint64) erts_os_monotonic_time();
+#endif
+
+ bld_monotonic_time_source(NULL, &hsz, os_mtime);
+ if (hsz)
+ hp = HAlloc(c_p, hsz);
+ return bld_monotonic_time_source(&hp, NULL, os_mtime);
+}
+
+
+#include "bif.h"
+
+static ERTS_INLINE Eterm
+time_unit_conversion(Process *c_p, Eterm term, ErtsMonotonicTime val, ErtsMonotonicTime muloff)
+{
+ ErtsMonotonicTime result;
+ BIF_RETTYPE ret;
+
+ if (val < 0)
+ goto trap_to_erlang_code;
+
+ /* Convert to common user specified time units */
+ switch (term) {
+ case am_seconds:
+ case make_small(1):
+ result = ERTS_MONOTONIC_TO_SEC(val) + muloff*ERTS_MONOTONIC_OFFSET_SEC;
+ ERTS_BIF_PREP_RET(ret, make_time_val(c_p, result));
+ break;
+ case am_milli_seconds:
+ case make_small(1000):
+ result = ERTS_MONOTONIC_TO_MSEC(val) + muloff*ERTS_MONOTONIC_OFFSET_MSEC;
+ ERTS_BIF_PREP_RET(ret, make_time_val(c_p, result));
+ break;
+ case am_micro_seconds:
+ case make_small(1000*1000):
+ result = ERTS_MONOTONIC_TO_USEC(val) + muloff*ERTS_MONOTONIC_OFFSET_USEC;
+ ERTS_BIF_PREP_RET(ret, make_time_val(c_p, result));
+ break;
+#ifdef ARCH_64
+ case am_nano_seconds:
+ case make_small(1000*1000*1000):
+ result = ERTS_MONOTONIC_TO_NSEC(val) + muloff*ERTS_MONOTONIC_OFFSET_NSEC;
+ ERTS_BIF_PREP_RET(ret, make_time_val(c_p, result));
+ break;
#endif
+ default: {
+ Eterm value, native_res;
+#ifndef ARCH_64
+ Sint user_res;
+ if (term == am_nano_seconds)
+ goto to_nano_seconds;
+ if (term_to_Sint(term, &user_res)) {
+ if (user_res == 1000*1000*1000) {
+ to_nano_seconds:
+ result = (ERTS_MONOTONIC_TO_NSEC(val)
+ + muloff*ERTS_MONOTONIC_OFFSET_NSEC);
+ ERTS_BIF_PREP_RET(ret, make_time_val(c_p, result));
+ break;
+ }
+ if (user_res <= 0)
+ goto badarg;
+ }
+#else
+ if (is_small(term)) {
+ if (signed_val(term) <= 0)
+ goto badarg;
+ }
+#endif
+ else if (is_big(term)) {
+ if (big_sign(term))
+ goto badarg;
+ }
+ else {
+ badarg:
+ ERTS_BIF_PREP_ERROR(ret, c_p, BADARG);
+ break;
+ }
+
+ trap_to_erlang_code:
+ /* Do it in erlang code instead; pass along values to use... */
+ value = make_time_val(c_p, val + muloff*ERTS_MONOTONIC_OFFSET_NATIVE);
+ native_res = make_time_val(c_p, ERTS_MONOTONIC_TIME_UNIT);
+
+ ERTS_BIF_PREP_TRAP3(ret, erts_convert_time_unit_trap, c_p,
+ value, native_res, term);
+
+ break;
+ }
+ }
+
+ return ret;
+}
+
+/* Built in functions */
+
+BIF_RETTYPE monotonic_time_0(BIF_ALIST_0)
+{
+ ErtsMonotonicTime mtime = time_sup.r.o.get_time();
+ mtime += ERTS_MONOTONIC_OFFSET_NATIVE;
+ BIF_RET(make_time_val(BIF_P, mtime));
+}
+
+BIF_RETTYPE monotonic_time_1(BIF_ALIST_1)
+{
+ BIF_RET(time_unit_conversion(BIF_P, BIF_ARG_1, time_sup.r.o.get_time(), 1));
+}
+
+BIF_RETTYPE system_time_0(BIF_ALIST_0)
+{
+ ErtsMonotonicTime mtime, offset;
+ mtime = time_sup.r.o.get_time();
+ offset = get_time_offset();
+ BIF_RET(make_time_val(BIF_P, mtime + offset));
+}
+
+BIF_RETTYPE system_time_1(BIF_ALIST_0)
+{
+ ErtsMonotonicTime mtime, offset;
+ mtime = time_sup.r.o.get_time();
+ offset = get_time_offset();
+ BIF_RET(time_unit_conversion(BIF_P, BIF_ARG_1, mtime + offset, 0));
+}
+
+BIF_RETTYPE erts_internal_time_unit_0(BIF_ALIST_0)
+{
+ BIF_RET(make_time_val(BIF_P, ERTS_MONOTONIC_TIME_UNIT));
+}
+
+BIF_RETTYPE time_offset_0(BIF_ALIST_0)
+{
+ ErtsMonotonicTime time_offset = get_time_offset();
+ time_offset -= ERTS_MONOTONIC_OFFSET_NATIVE;
+ BIF_RET(make_time_val(BIF_P, time_offset));
+}
+
+BIF_RETTYPE time_offset_1(BIF_ALIST_1)
+{
+ BIF_RET(time_unit_conversion(BIF_P, BIF_ARG_1, get_time_offset(), -1));
+}
+
+
+BIF_RETTYPE timestamp_0(BIF_ALIST_0)
+{
+ Eterm *hp, res;
+ ErtsMonotonicTime stime, mtime, all_sec, offset;
+ Uint mega_sec, sec, micro_sec;
+
+ mtime = time_sup.r.o.get_time();
+ offset = get_time_offset();
+ stime = ERTS_MONOTONIC_TO_USEC(mtime + offset);
+ all_sec = stime / ERTS_MONOTONIC_TIME_MEGA;
+ mega_sec = (Uint) (stime / ERTS_MONOTONIC_TIME_TERA);
+ sec = (Uint) (all_sec - (((ErtsMonotonicTime) mega_sec)
+ * ERTS_MONOTONIC_TIME_MEGA));
+ micro_sec = (Uint) (stime - all_sec*ERTS_MONOTONIC_TIME_MEGA);
+
+ ASSERT(((ErtsMonotonicTime) mega_sec)*ERTS_MONOTONIC_TIME_TERA
+ + ((ErtsMonotonicTime) sec)*ERTS_MONOTONIC_TIME_MEGA
+ + micro_sec == stime);
+
+ /*
+ * Mega seconds is the only value that potentially
+ * ever could be a bignum. However, that wont happen
+ * during at least the next 4 million years...
+ *
+ * (System time will also have wrapped in the
+ * 64-bit integer before we get there...)
+ */
+
+ ASSERT(IS_USMALL(0, mega_sec));
+ ASSERT(IS_USMALL(0, sec));
+ ASSERT(IS_USMALL(0, micro_sec));
+
+ hp = HAlloc(BIF_P, 4);
+ res = TUPLE3(hp,
+ make_small(mega_sec),
+ make_small(sec),
+ make_small(micro_sec));
+ BIF_RET(res);
+}
+
+BIF_RETTYPE os_system_time_0(BIF_ALIST_0)
+{
+ ErtsMonotonicTime stime;
+ SysTimeval tod;
+ sys_gettimeofday(&tod);
+ stime = ERTS_SEC_TO_MONOTONIC(tod.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(tod.tv_usec);
+ BIF_RET(make_time_val(BIF_P, stime));
+}
+
+BIF_RETTYPE os_system_time_1(BIF_ALIST_0)
+{
+ ErtsMonotonicTime stime;
+ SysTimeval tod;
+ sys_gettimeofday(&tod);
+ stime = ERTS_SEC_TO_MONOTONIC(tod.tv_sec);
+ stime += ERTS_USEC_TO_MONOTONIC(tod.tv_usec);
+ BIF_RET(time_unit_conversion(BIF_P, BIF_ARG_1, stime, 0));
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 06:09:25 +0000