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Diffstat (limited to 'erts/emulator/sys/unix/sys.c')
-rw-r--r--erts/emulator/sys/unix/sys.c316
1 files changed, 93 insertions, 223 deletions
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index e5ee0df7fa..f94e0f2296 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -52,6 +52,7 @@
#define ERTS_WANT_GOT_SIGUSR1
#define WANT_NONBLOCKING /* must define this to pull in defs from sys.h */
#include "sys.h"
+#include "erl_thr_progress.h"
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
#define __DARWIN__ 1
@@ -127,7 +128,6 @@ static ErtsSysReportExit *report_exit_list;
static ErtsSysReportExit *report_exit_transit_list;
#endif
-extern int check_async_ready(void);
extern int driver_interrupt(int, int);
extern void do_break(void);
@@ -167,12 +167,12 @@ static int debug_log = 0;
#ifdef ERTS_SMP
erts_smp_atomic32_t erts_got_sigusr1;
#define ERTS_SET_GOT_SIGUSR1 \
- erts_smp_atomic32_set(&erts_got_sigusr1, 1)
+ erts_smp_atomic32_set_mb(&erts_got_sigusr1, 1)
#define ERTS_UNSET_GOT_SIGUSR1 \
- erts_smp_atomic32_set(&erts_got_sigusr1, 0)
+ erts_smp_atomic32_set_mb(&erts_got_sigusr1, 0)
static erts_smp_atomic32_t have_prepared_crash_dump;
#define ERTS_PREPARED_CRASH_DUMP \
- ((int) erts_smp_atomic32_xchg(&have_prepared_crash_dump, 1))
+ ((int) erts_smp_atomic32_xchg_nob(&have_prepared_crash_dump, 1))
#else
volatile int erts_got_sigusr1;
#define ERTS_SET_GOT_SIGUSR1 (erts_got_sigusr1 = 1)
@@ -242,9 +242,9 @@ static int max_files = -1;
#ifdef ERTS_SMP
erts_smp_atomic32_t erts_break_requested;
#define ERTS_SET_BREAK_REQUESTED \
- erts_smp_atomic32_set(&erts_break_requested, (erts_aint32_t) 1)
+ erts_smp_atomic32_set_nob(&erts_break_requested, (erts_aint32_t) 1)
#define ERTS_UNSET_BREAK_REQUESTED \
- erts_smp_atomic32_set(&erts_break_requested, (erts_aint32_t) 0)
+ erts_smp_atomic32_set_nob(&erts_break_requested, (erts_aint32_t) 0)
#else
volatile int erts_break_requested = 0;
#define ERTS_SET_BREAK_REQUESTED (erts_break_requested = 1)
@@ -263,8 +263,9 @@ int erts_use_kernel_poll = 0;
struct {
int (*select)(ErlDrvPort, ErlDrvEvent, int, int);
int (*event)(ErlDrvPort, ErlDrvEvent, ErlDrvEventData);
+ void (*check_io_as_interrupt)(void);
void (*check_io_interrupt)(int);
- void (*check_io_interrupt_tmd)(int, long);
+ void (*check_io_interrupt_tmd)(int, erts_short_time_t);
void (*check_io)(int);
Uint (*size)(void);
Eterm (*info)(void *);
@@ -302,6 +303,9 @@ init_check_io(void)
if (erts_use_kernel_poll) {
io_func.select = driver_select_kp;
io_func.event = driver_event_kp;
+#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
+ io_func.check_io_as_interrupt = erts_check_io_async_sig_interrupt_kp;
+#endif
io_func.check_io_interrupt = erts_check_io_interrupt_kp;
io_func.check_io_interrupt_tmd = erts_check_io_interrupt_timed_kp;
io_func.check_io = erts_check_io_kp;
@@ -314,6 +318,9 @@ init_check_io(void)
else {
io_func.select = driver_select_nkp;
io_func.event = driver_event_nkp;
+#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
+ io_func.check_io_as_interrupt = erts_check_io_async_sig_interrupt_nkp;
+#endif
io_func.check_io_interrupt = erts_check_io_interrupt_nkp;
io_func.check_io_interrupt_tmd = erts_check_io_interrupt_timed_nkp;
io_func.check_io = erts_check_io_nkp;
@@ -325,6 +332,11 @@ init_check_io(void)
}
}
+#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
+#define ERTS_CHK_IO_AS_INTR() (*io_func.check_io_as_interrupt)()
+#else
+#define ERTS_CHK_IO_AS_INTR() (*io_func.check_io_interrupt)(1)
+#endif
#define ERTS_CHK_IO_INTR (*io_func.check_io_interrupt)
#define ERTS_CHK_IO_INTR_TMD (*io_func.check_io_interrupt_tmd)
#define ERTS_CHK_IO (*io_func.check_io)
@@ -339,6 +351,11 @@ init_check_io(void)
max_files = erts_check_io_max_files();
}
+#ifdef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
+#define ERTS_CHK_IO_AS_INTR() erts_check_io_async_sig_interrupt()
+#else
+#define ERTS_CHK_IO_AS_INTR() erts_check_io_interrupt(1)
+#endif
#define ERTS_CHK_IO_INTR erts_check_io_interrupt
#define ERTS_CHK_IO_INTR_TMD erts_check_io_interrupt_timed
#define ERTS_CHK_IO erts_check_io
@@ -346,15 +363,15 @@ init_check_io(void)
#endif
-#ifdef ERTS_SMP
void
erts_sys_schedule_interrupt(int set)
{
ERTS_CHK_IO_INTR(set);
}
+#ifdef ERTS_SMP
void
-erts_sys_schedule_interrupt_timed(int set, long msec)
+erts_sys_schedule_interrupt_timed(int set, erts_short_time_t msec)
{
ERTS_CHK_IO_INTR_TMD(set, msec);
}
@@ -364,7 +381,7 @@ Uint
erts_sys_misc_mem_sz(void)
{
Uint res = ERTS_CHK_IO_SZ();
- res += erts_smp_atomic_read(&sys_misc_mem_sz);
+ res += erts_smp_atomic_read_mb(&sys_misc_mem_sz);
return res;
}
@@ -509,9 +526,9 @@ erts_sys_pre_init(void)
#endif
}
#ifdef ERTS_SMP
- erts_smp_atomic32_init(&erts_break_requested, 0);
- erts_smp_atomic32_init(&erts_got_sigusr1, 0);
- erts_smp_atomic32_init(&have_prepared_crash_dump, 0);
+ erts_smp_atomic32_init_nob(&erts_break_requested, 0);
+ erts_smp_atomic32_init_nob(&erts_got_sigusr1, 0);
+ erts_smp_atomic32_init_nob(&have_prepared_crash_dump, 0);
#else
erts_break_requested = 0;
erts_got_sigusr1 = 0;
@@ -521,7 +538,7 @@ erts_sys_pre_init(void)
children_died = 0;
#endif
#endif /* USE_THREADS */
- erts_smp_atomic_init(&sys_misc_mem_sz, 0);
+ erts_smp_atomic_init_nob(&sys_misc_mem_sz, 0);
}
void
@@ -552,7 +569,7 @@ erl_sys_init(void)
+ sizeof(CHILD_SETUP_PROG_NAME)
+ 1);
child_setup_prog = erts_alloc(ERTS_ALC_T_CS_PROG_PATH, csp_path_sz);
- erts_smp_atomic_add(&sys_misc_mem_sz, csp_path_sz);
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, csp_path_sz);
sprintf(child_setup_prog,
"%s%c%s",
bindir,
@@ -731,7 +748,7 @@ break_requested(void)
erl_exit(ERTS_INTR_EXIT, "");
ERTS_SET_BREAK_REQUESTED;
- ERTS_CHK_IO_INTR(1); /* Make sure we don't sleep in poll */
+ ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
}
/* set up signal handlers for break and quit */
@@ -931,18 +948,13 @@ void
os_flavor(char* namebuf, /* Where to return the name. */
unsigned size) /* Size of name buffer. */
{
- static int called = 0;
- static struct utsname uts; /* Information about the system. */
-
- if (!called) {
- char* s;
+ struct utsname uts; /* Information about the system. */
+ char* s;
- (void) uname(&uts);
- called = 1;
- for (s = uts.sysname; *s; s++) {
- if (isupper((int) *s)) {
- *s = tolower((int) *s);
- }
+ (void) uname(&uts);
+ for (s = uts.sysname; *s; s++) {
+ if (isupper((int) *s)) {
+ *s = tolower((int) *s);
}
}
strcpy(namebuf, uts.sysname);
@@ -1021,14 +1033,15 @@ static struct driver_data {
/* Driver interfaces */
static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
-static int fd_control(ErlDrvData, unsigned int, char *, int, char **, int);
+static ErlDrvSSizeT fd_control(ErlDrvData, unsigned int, char *, ErlDrvSizeT,
+ char **, ErlDrvSizeT);
static ErlDrvData vanilla_start(ErlDrvPort, char*, SysDriverOpts*);
static int spawn_init(void);
static void fd_stop(ErlDrvData);
static void stop(ErlDrvData);
static void ready_input(ErlDrvData, ErlDrvEvent);
static void ready_output(ErlDrvData, ErlDrvEvent);
-static void output(ErlDrvData, char*, int);
+static void output(ErlDrvData, char*, ErlDrvSizeT);
static void outputv(ErlDrvData, ErlIOVec*);
static void stop_select(ErlDrvEvent, void*);
@@ -1107,31 +1120,6 @@ struct erl_drv_entry vanilla_driver_entry = {
stop_select
};
-#if defined(USE_THREADS) && !defined(ERTS_SMP)
-static int async_drv_init(void);
-static ErlDrvData async_drv_start(ErlDrvPort, char*, SysDriverOpts*);
-static void async_drv_stop(ErlDrvData);
-static void async_drv_input(ErlDrvData, ErlDrvEvent);
-
-/* INTERNAL use only */
-
-struct erl_drv_entry async_driver_entry = {
- async_drv_init,
- async_drv_start,
- async_drv_stop,
- NULL,
- async_drv_input,
- NULL,
- "async",
- NULL,
- NULL,
- NULL,
- NULL,
- NULL,
- NULL
-};
-#endif
-
/* Handle SIGCHLD signals. */
#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
static RETSIGTYPE onchld(void)
@@ -1145,7 +1133,7 @@ static RETSIGTYPE onchld(int signum)
smp_sig_notify('C');
#else
children_died = 1;
- ERTS_CHK_IO_INTR(1); /* Make sure we don't sleep in poll */
+ ERTS_CHK_IO_AS_INTR(); /* Make sure we don't sleep in poll */
#endif
}
@@ -1215,8 +1203,8 @@ static int spawn_init()
sys_sigset(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
driver_data = (struct driver_data *)
erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(struct driver_data));
- erts_smp_atomic_add(&sys_misc_mem_sz,
- max_files * sizeof(struct driver_data));
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz,
+ max_files * sizeof(struct driver_data));
for (i = 0; i < max_files; i++)
driver_data[i].pid = -1;
@@ -1739,10 +1727,10 @@ static int fd_get_window_size(int fd, Uint32 *width, Uint32 *height)
return -1;
}
-static int fd_control(ErlDrvData drv_data,
- unsigned int command,
- char *buf, int len,
- char **rbuf, int rlen)
+static ErlDrvSSizeT fd_control(ErlDrvData drv_data,
+ unsigned int command,
+ char *buf, ErlDrvSizeT len,
+ char **rbuf, ErlDrvSizeT rlen)
{
int fd = (int)(long)drv_data;
char resbuff[2*sizeof(Uint32)];
@@ -1924,8 +1912,8 @@ static void clear_fd_data(int fd)
{
if (fd_data[fd].sz > 0) {
erts_free(ERTS_ALC_T_FD_ENTRY_BUF, (void *) fd_data[fd].buf);
- ASSERT(erts_smp_atomic_read(&sys_misc_mem_sz) >= fd_data[fd].sz);
- erts_smp_atomic_add(&sys_misc_mem_sz, -1*fd_data[fd].sz);
+ ASSERT(erts_smp_atomic_read_nob(&sys_misc_mem_sz) >= fd_data[fd].sz);
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*fd_data[fd].sz);
}
fd_data[fd].buf = NULL;
fd_data[fd].sz = 0;
@@ -2014,18 +2002,20 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
int ix = driver_data[fd].port_num;
int pb = driver_data[fd].packet_bytes;
int ofd = driver_data[fd].ofd;
- int n;
- int sz;
+ ssize_t n;
+ ErlDrvSizeT sz;
char lb[4];
char* lbp;
- int len = ev->size;
+ ErlDrvSizeT len = ev->size;
/* (len > ((unsigned long)-1 >> (4-pb)*8)) */
+ /* if (pb >= 0 && (len & (((ErlDrvSizeT)1 << (pb*8))) - 1) != len) {*/
if (((pb == 2) && (len > 0xffff)) || (pb == 1 && len > 0xff)) {
driver_failure_posix(ix, EINVAL);
return; /* -1; */
}
- put_int32(len, lb);
+ /* Handles 0 <= pb <= 4 only */
+ put_int32((Uint32) len, lb);
lbp = lb + (4-pb);
ev->iov[0].iov_base = lbp;
@@ -2056,14 +2046,14 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
}
-static void output(ErlDrvData e, char* buf, int len)
+static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
{
int fd = (int)(long)e;
int ix = driver_data[fd].port_num;
int pb = driver_data[fd].packet_bytes;
int ofd = driver_data[fd].ofd;
- int n;
- int sz;
+ ssize_t n;
+ ErlDrvSizeT sz;
char lb[4];
char* lbp;
struct iovec iv[2];
@@ -2260,7 +2250,7 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
port_inp_failure(port_num, ready_fd, -1);
}
else {
- erts_smp_atomic_add(&sys_misc_mem_sz, h);
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, h);
sys_memcpy(buf, cpos, bytes_left);
fd_data[ready_fd].buf = buf;
fd_data[ready_fd].sz = h;
@@ -2316,87 +2306,6 @@ static void stop_select(ErlDrvEvent fd, void* _)
close((int)fd);
}
-/*
-** Async opertation support
-*/
-#if defined(USE_THREADS) && !defined(ERTS_SMP)
-static void
-sys_async_ready_failed(int fd, int r, int err)
-{
- char buf[120];
- sprintf(buf, "sys_async_ready(): Fatal error: fd=%d, r=%d, errno=%d\n",
- fd, r, err);
- erts_silence_warn_unused_result(write(2, buf, strlen(buf)));
- abort();
-}
-
-/* called from threads !! */
-void sys_async_ready(int fd)
-{
- int r;
- while (1) {
- r = write(fd, "0", 1); /* signal main thread fd MUST be async_fd[1] */
- if (r == 1) {
- DEBUGF(("sys_async_ready(): r = 1\r\n"));
- break;
- }
- if (r < 0 && errno == EINTR) {
- DEBUGF(("sys_async_ready(): r = %d\r\n", r));
- continue;
- }
- sys_async_ready_failed(fd, r, errno);
- }
-}
-
-static int async_drv_init(void)
-{
- async_fd[0] = -1;
- async_fd[1] = -1;
- return 0;
-}
-
-static ErlDrvData async_drv_start(ErlDrvPort port_num,
- char* name, SysDriverOpts* opts)
-{
- if (async_fd[0] != -1)
- return ERL_DRV_ERROR_GENERAL;
- if (pipe(async_fd) < 0)
- return ERL_DRV_ERROR_GENERAL;
-
- DEBUGF(("async_drv_start: %d\r\n", port_num));
-
- SET_NONBLOCKING(async_fd[0]);
- driver_select(port_num, async_fd[0], ERL_DRV_READ, 1);
-
- if (init_async(async_fd[1]) < 0)
- return ERL_DRV_ERROR_GENERAL;
- return (ErlDrvData)port_num;
-}
-
-static void async_drv_stop(ErlDrvData e)
-{
- int port_num = (int)(long)e;
-
- DEBUGF(("async_drv_stop: %d\r\n", port_num));
-
- exit_async();
-
- driver_select(port_num, async_fd[0], ERL_DRV_READ, 0);
-
- close(async_fd[0]);
- close(async_fd[1]);
- async_fd[0] = async_fd[1] = -1;
-}
-
-
-static void async_drv_input(ErlDrvData e, ErlDrvEvent fd)
-{
- char *buf[32];
- DEBUGF(("async_drv_input\r\n"));
- while (read((int) fd, (void *) buf, 32) > 0); /* fd MUST be async_fd[0] */
- check_async_ready(); /* invoke all async_ready */
-}
-#endif
void erts_do_break_handling(void)
{
@@ -2408,11 +2317,7 @@ void erts_do_break_handling(void)
* therefore, make sure that all threads but this one are blocked before
* proceeding!
*/
- erts_smp_block_system(0);
- /*
- * NOTE: since we allow gc we are not allowed to lock
- * (any) process main locks while blocking system...
- */
+ erts_smp_thr_progress_block();
/* during break we revert to initial settings */
/* this is done differently for oldshell */
@@ -2440,7 +2345,7 @@ void erts_do_break_handling(void)
tcsetattr(0,TCSANOW,&temp_mode);
}
- erts_smp_release_system();
+ erts_smp_thr_progress_unblock();
}
/* Fills in the systems representation of the jam/beam process identifier.
@@ -2464,7 +2369,7 @@ erts_sys_putenv(char *buffer, int sep_ix)
#else
Uint sz = strlen(buffer)+1;
env = erts_alloc(ERTS_ALC_T_PUTENV_STR, sz);
- erts_smp_atomic_add(&sys_misc_mem_sz, sz);
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, sz);
strcpy(env,buffer);
#endif
erts_smp_rwmtx_rwlock(&environ_rwmtx);
@@ -2474,12 +2379,10 @@ erts_sys_putenv(char *buffer, int sep_ix)
}
int
-erts_sys_getenv(char *key, char *value, size_t *size)
+erts_sys_getenv__(char *key, char *value, size_t *size)
{
- char *orig_value;
int res;
- erts_smp_rwmtx_rlock(&environ_rwmtx);
- orig_value = getenv(key);
+ char *orig_value = getenv(key);
if (!orig_value)
res = -1;
else {
@@ -2494,6 +2397,15 @@ erts_sys_getenv(char *key, char *value, size_t *size)
res = 0;
}
}
+ return res;
+}
+
+int
+erts_sys_getenv(char *key, char *value, size_t *size)
+{
+ int res;
+ erts_smp_rwmtx_rlock(&environ_rwmtx);
+ res = erts_sys_getenv__(key, value, size);
erts_smp_rwmtx_runlock(&environ_rwmtx);
return res;
}
@@ -2503,33 +2415,8 @@ sys_init_io(void)
{
fd_data = (struct fd_data *)
erts_alloc(ERTS_ALC_T_FD_TAB, max_files * sizeof(struct fd_data));
- erts_smp_atomic_add(&sys_misc_mem_sz,
- max_files * sizeof(struct fd_data));
-
-#ifdef USE_THREADS
-#ifdef ERTS_SMP
- if (init_async(-1) < 0)
- erl_exit(1, "Failed to initialize async-threads\n");
-#else
- {
- /* This is speical stuff, starting a driver from the
- * system routines, but is a nice way of handling stuff
- * the erlang way
- */
- SysDriverOpts dopts;
- int ret;
-
- sys_memset((void*)&dopts, 0, sizeof(SysDriverOpts));
- add_driver_entry(&async_driver_entry);
- ret = erts_open_driver(NULL, NIL, "async", &dopts, NULL);
- DEBUGF(("open_driver = %d\n", ret));
- if (ret < 0)
- erl_exit(1, "Failed to open async driver\n");
- erts_port[ret].status |= ERTS_PORT_SFLG_IMMORTAL;
- }
-#endif
-#endif
-
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz,
+ max_files * sizeof(struct fd_data));
}
#if (0) /* unused? */
@@ -2756,15 +2643,7 @@ initiate_report_exit_status(ErtsSysReportExit *rep, int status)
rep->next = report_exit_transit_list;
rep->status = status;
report_exit_transit_list = rep;
- /*
- * We need the scheduler thread to call check_children().
- * If the scheduler thread is sleeping in a poll with a
- * timeout, we need to wake the scheduler thread. We use the
- * functionality of the async driver to do this, instead of
- * implementing yet another driver doing the same thing. A
- * little bit ugly, but it works...
- */
- sys_async_ready(async_fd[1]);
+ erts_sys_schedule_interrupt(1);
}
static int check_children(void)
@@ -2851,20 +2730,11 @@ erl_sys_schedule(int runnable)
{
#ifdef ERTS_SMP
ERTS_CHK_IO(!runnable);
- ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING);
#else
- ERTS_CHK_IO_INTR(0);
- if (runnable) {
- ERTS_CHK_IO(0); /* Poll for I/O */
- check_async_ready(); /* Check async completions */
- } else {
- int wait_for_io = !check_async_ready();
- if (wait_for_io)
- wait_for_io = !check_children();
- ERTS_CHK_IO(wait_for_io);
- }
- (void) check_children();
+ ERTS_CHK_IO(runnable ? 0 : !check_children());
#endif
+ ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking());
+ (void) check_children();
}
@@ -2892,8 +2762,8 @@ smp_sig_notify(char c)
static void *
signal_dispatcher_thread_func(void *unused)
{
- int initialized = 0;
#if !CHLDWTHR
+ int initialized = 0;
int notify_check_children = 0;
#endif
#ifdef ERTS_ENABLE_LOCK_CHECK
@@ -2921,20 +2791,20 @@ signal_dispatcher_thread_func(void *unused)
* to other threads.
*
* NOTE 2: The signal dispatcher thread is not a blockable
- * thread (i.e., it hasn't called
- * erts_register_blockable_thread()). This is
- * intentional. We want to be able to interrupt
- * writing of a crash dump by hitting C-c twice.
- * Since it isn't a blockable thread it is important
- * that it doesn't change the state of any data that
- * a blocking thread expects to have exclusive access
- * to (unless the signal dispatcher itself explicitly
- * is blocking all blockable threads).
+ * thread (i.e., not a thread managed by the
+ * erl_thr_progress module). This is intentional.
+ * We want to be able to interrupt writing of a crash
+ * dump by hitting C-c twice. Since it isn't a
+ * blockable thread it is important that it doesn't
+ * change the state of any data that a blocking thread
+ * expects to have exclusive access to (unless the
+ * signal dispatcher itself explicitly is blocking all
+ * blockable threads).
*/
switch (buf[i]) {
case 0: /* Emulator initialized */
- initialized = 1;
#if !CHLDWTHR
+ initialized = 1;
if (!notify_check_children)
#endif
break;
@@ -2969,7 +2839,7 @@ signal_dispatcher_thread_func(void *unused)
buf[i]);
}
}
- ERTS_SMP_LC_ASSERT(!ERTS_LC_IS_BLOCKING);
+ ERTS_SMP_LC_ASSERT(!erts_thr_progress_is_blocking());
}
return NULL;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-23 22:14:19 +0000