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-rw-r--r--erts/emulator/sys/unix/sys.c521
1 files changed, 385 insertions, 136 deletions
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index cd87b320e2..8d7da3e47e 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -3,16 +3,17 @@
*
* Copyright Ericsson AB 1996-2014. All Rights Reserved.
*
- * The contents of this file are subject to the Erlang Public License,
- * Version 1.1, (the "License"); you may not use this file except in
- * compliance with the License. You should have received a copy of the
- * Erlang Public License along with this software. If not, it can be
- * retrieved online at http://www.erlang.org/.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
*
- * Software distributed under the License is distributed on an "AS IS"
- * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
- * the License for the specific language governing rights and limitations
- * under the License.
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
*
* %CopyrightEnd%
*/
@@ -34,6 +35,7 @@
#include <termios.h>
#include <ctype.h>
#include <sys/utsname.h>
+#include <sys/select.h>
#ifdef ISC32
#include <sys/bsdtypes.h>
@@ -85,14 +87,24 @@ static erts_smp_rwmtx_t environ_rwmtx;
#define DISABLE_VFORK 0
#endif
+#if defined IOV_MAX
+#define MAXIOV IOV_MAX
+#elif defined UIO_MAXIOV
+#define MAXIOV UIO_MAXIOV
+#else
+#define MAXIOV 16
+#endif
+
#ifdef USE_THREADS
# ifdef ENABLE_CHILD_WAITER_THREAD
# define CHLDWTHR ENABLE_CHILD_WAITER_THREAD
# else
# define CHLDWTHR 0
# endif
+# define FDBLOCK 1
#else
# define CHLDWTHR 0
+# define FDBLOCK 0
#endif
/*
* [OTP-3906]
@@ -121,6 +133,15 @@ struct ErtsSysReportExit_ {
#endif
};
+/* Used by the fd driver iff the fd could not be set to non-blocking */
+typedef struct ErtsSysBlocking_ {
+ ErlDrvPDL pdl;
+ int res;
+ int err;
+ unsigned int pkey;
+} ErtsSysBlocking;
+
+
/* This data is shared by these drivers - initialized by spawn_init() */
static struct driver_data {
ErlDrvPort port_num;
@@ -129,6 +150,8 @@ static struct driver_data {
int pid;
int alive;
int status;
+ int terminating;
+ ErtsSysBlocking *blocking;
} *driver_data; /* indexed by fd */
static ErtsSysReportExit *report_exit_list;
@@ -202,8 +225,14 @@ static erts_smp_atomic_t sys_misc_mem_sz;
#if defined(ERTS_SMP)
static void smp_sig_notify(char c);
static int sig_notify_fds[2] = {-1, -1};
+
+static int sig_suspend_fds[2] = {-1, -1};
+#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
+
#endif
+jmp_buf erts_sys_sigsegv_jmp;
+
#if CHLDWTHR || defined(ERTS_SMP)
erts_mtx_t chld_stat_mtx;
#endif
@@ -280,7 +309,7 @@ struct {
int (*event)(ErlDrvPort, ErlDrvEvent, ErlDrvEventData);
void (*check_io_as_interrupt)(void);
void (*check_io_interrupt)(int);
- void (*check_io_interrupt_tmd)(int, erts_short_time_t);
+ void (*check_io_interrupt_tmd)(int, ErtsMonotonicTime);
void (*check_io)(int);
Uint (*size)(void);
Eterm (*info)(void *);
@@ -386,9 +415,9 @@ erts_sys_schedule_interrupt(int set)
#ifdef ERTS_SMP
void
-erts_sys_schedule_interrupt_timed(int set, erts_short_time_t msec)
+erts_sys_schedule_interrupt_timed(int set, ErtsMonotonicTime timeout_time)
{
- ERTS_CHK_IO_INTR_TMD(set, msec);
+ ERTS_CHK_IO_INTR_TMD(set, timeout_time);
}
#endif
@@ -504,11 +533,14 @@ thr_create_prepare_child(void *vtcdp)
void
erts_sys_pre_init(void)
{
+#ifdef USE_THREADS
+ erts_thr_init_data_t eid = ERTS_THR_INIT_DATA_DEF_INITER;
+#endif
+
erts_printf_add_cr_to_stdout = 1;
erts_printf_add_cr_to_stderr = 1;
+
#ifdef USE_THREADS
- {
- erts_thr_init_data_t eid = ERTS_THR_INIT_DATA_DEF_INITER;
eid.thread_create_child_func = thr_create_prepare_child;
/* Before creation in parent */
@@ -531,6 +563,12 @@ erts_sys_pre_init(void)
erts_lcnt_init();
#endif
+#endif /* USE_THREADS */
+
+ erts_init_sys_time_sup();
+
+#ifdef USE_THREADS
+
#if CHLDWTHR || defined(ERTS_SMP)
erts_mtx_init(&chld_stat_mtx, "child_status");
#endif
@@ -541,7 +579,7 @@ erts_sys_pre_init(void)
erts_cnd_init(&chld_stat_cnd);
children_alive = 0;
#endif
- }
+
#ifdef ERTS_SMP
erts_smp_atomic32_init_nob(&erts_break_requested, 0);
erts_smp_atomic32_init_nob(&erts_got_sigusr1, 0);
@@ -554,7 +592,9 @@ erts_sys_pre_init(void)
#if !CHLDWTHR && !defined(ERTS_SMP)
children_died = 0;
#endif
+
#endif /* USE_THREADS */
+
erts_smp_atomic_init_nob(&sys_misc_mem_sz, 0);
{
@@ -640,39 +680,7 @@ erl_sys_init(void)
/* signal handling */
-#ifdef SIG_SIGSET /* Old SysV */
-RETSIGTYPE (*sys_sigset(sig, func))()
-int sig;
-RETSIGTYPE (*func)();
-{
- return(sigset(sig, func));
-}
-void sys_sigblock(int sig)
-{
- sighold(sig);
-}
-void sys_sigrelease(int sig)
-{
- sigrelse(sig);
-}
-#else /* !SIG_SIGSET */
-#ifdef SIG_SIGNAL /* Old BSD */
-RETSIGTYPE (*sys_sigset(sig, func))(int, int)
-int sig;
-RETSIGTYPE (*func)();
-{
- return(signal(sig, func));
-}
-sys_sigblock(int sig)
-{
- sigblock(sig);
-}
-sys_sigrelease(int sig)
-{
- sigsetmask(sigblock(0) & ~sigmask(sig));
-}
-#else /* !SIG_SIGNAL */ /* The True Way - POSIX!:-) */
-RETSIGTYPE (*sys_sigset(int sig, RETSIGTYPE (*func)(int)))(int)
+SIGFUNC sys_signal(int sig, SIGFUNC func)
{
struct sigaction act, oact;
@@ -705,23 +713,35 @@ void sys_sigrelease(int sig)
sigaddset(&mask, sig);
sigprocmask(SIG_UNBLOCK, &mask, (sigset_t *)NULL);
}
-#endif /* !SIG_SIGNAL */
-#endif /* !SIG_SIGSET */
-#if (0) /* not used? -- gordon */
-static void (*break_func)();
-static RETSIGTYPE break_handler(int sig)
-{
-#ifdef QNX
- /* Turn off SIGCHLD during break processing */
- sys_sigblock(SIGCHLD);
-#endif
- (*break_func)();
-#ifdef QNX
- sys_sigrelease(SIGCHLD);
-#endif
+void erts_sys_sigsegv_handler(int signo) {
+ if (signo == SIGSEGV) {
+ longjmp(erts_sys_sigsegv_jmp, 1);
+ }
+}
+
+/*
+ * Function returns 1 if we can read from all values in between
+ * start and stop.
+ */
+int
+erts_sys_is_area_readable(char *start, char *stop) {
+ int fds[2];
+ if (!pipe(fds)) {
+ /* We let write try to figure out if the pointers are readable */
+ int res = write(fds[1], start, (char*)stop - (char*)start);
+ if (res == -1) {
+ close(fds[0]);
+ close(fds[1]);
+ return 0;
+ }
+ close(fds[0]);
+ close(fds[1]);
+ return 1;
+ }
+ return 0;
+
}
-#endif /* 0 */
static ERTS_INLINE int
prepare_crash_dump(int secs)
@@ -849,9 +869,23 @@ sigusr1_exit(void)
#ifdef ETHR_UNUSABLE_SIGUSRX
#warning "Unusable SIGUSR1 & SIGUSR2. Disabling use of these signals"
-#endif
-#ifndef ETHR_UNUSABLE_SIGUSRX
+#else
+
+#ifdef ERTS_SMP
+void
+sys_thr_suspend(erts_tid_t tid) {
+ erts_thr_kill(tid, ERTS_SYS_SUSPEND_SIGNAL);
+}
+
+void
+sys_thr_resume(erts_tid_t tid) {
+ int i = 0, res;
+ do {
+ res = write(sig_suspend_fds[1],&i,sizeof(i));
+ } while (res < 0 && errno == EAGAIN);
+}
+#endif
#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
static RETSIGTYPE user_signal1(void)
@@ -866,20 +900,20 @@ static RETSIGTYPE user_signal1(int signum)
#endif
}
-#ifdef QUANTIFY
+#ifdef ERTS_SMP
#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
-static RETSIGTYPE user_signal2(void)
+static RETSIGTYPE suspend_signal(void)
#else
-static RETSIGTYPE user_signal2(int signum)
+static RETSIGTYPE suspend_signal(int signum)
#endif
{
-#ifdef ERTS_SMP
- smp_sig_notify('2');
-#else
- quantify_save_data();
-#endif
+ int res;
+ int buf[1];
+ do {
+ res = read(sig_suspend_fds[0], buf, sizeof(int));
+ } while (res < 0 && errno == EINTR);
}
-#endif
+#endif /* #ifdef ERTS_SMP */
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
@@ -904,9 +938,9 @@ static RETSIGTYPE do_quit(int signum)
/* Disable break */
void erts_set_ignore_break(void) {
- sys_sigset(SIGINT, SIG_IGN);
- sys_sigset(SIGQUIT, SIG_IGN);
- sys_sigset(SIGTSTP, SIG_IGN);
+ sys_signal(SIGINT, SIG_IGN);
+ sys_signal(SIGQUIT, SIG_IGN);
+ sys_signal(SIGTSTP, SIG_IGN);
}
/* Don't use ctrl-c for break handler but let it be
@@ -929,14 +963,14 @@ void erts_replace_intr(void) {
void init_break_handler(void)
{
- sys_sigset(SIGINT, request_break);
+ sys_signal(SIGINT, request_break);
#ifndef ETHR_UNUSABLE_SIGUSRX
- sys_sigset(SIGUSR1, user_signal1);
-#ifdef QUANTIFY
- sys_sigset(SIGUSR2, user_signal2);
-#endif
+ sys_signal(SIGUSR1, user_signal1);
+#ifdef ERTS_SMP
+ sys_signal(ERTS_SYS_SUSPEND_SIGNAL, suspend_signal);
+#endif /* #ifdef ERTS_SMP */
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
- sys_sigset(SIGQUIT, do_quit);
+ sys_signal(SIGQUIT, do_quit);
}
int sys_max_files(void)
@@ -953,8 +987,13 @@ static void block_signals(void)
sys_sigblock(SIGINT);
#ifndef ETHR_UNUSABLE_SIGUSRX
sys_sigblock(SIGUSR1);
+#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+ sys_sigblock(ERTS_SYS_SUSPEND_SIGNAL);
#endif
-#endif
+
}
static void unblock_signals(void)
@@ -968,26 +1007,13 @@ static void unblock_signals(void)
#ifndef ETHR_UNUSABLE_SIGUSRX
sys_sigrelease(SIGUSR1);
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+ sys_sigrelease(ERTS_SYS_SUSPEND_SIGNAL);
#endif
-}
-/************************** Time stuff **************************/
-#ifdef HAVE_GETHRTIME
-#ifdef GETHRTIME_WITH_CLOCK_GETTIME
-SysHrTime sys_gethrtime(void)
-{
- struct timespec ts;
- long long result;
- if (clock_gettime(CLOCK_MONOTONIC,&ts) != 0) {
- erl_exit(1,"Fatal, could not get clock_monotonic value!, "
- "errno = %d\n", errno);
- }
- result = ((long long) ts.tv_sec) * 1000000000LL +
- ((long long) ts.tv_nsec);
- return (SysHrTime) result;
}
-#endif
-#endif
/************************** OS info *******************************/
@@ -1094,11 +1120,16 @@ void fini_getenv_state(GETENV_STATE *state)
/* Driver interfaces */
static ErlDrvData spawn_start(ErlDrvPort, char*, SysDriverOpts*);
static ErlDrvData fd_start(ErlDrvPort, char*, SysDriverOpts*);
+#if FDBLOCK
+static void fd_async(void *);
+static void fd_ready_async(ErlDrvData drv_data, ErlDrvThreadData thread_data);
+#endif
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 fd_flush(ErlDrvData);
static void stop(ErlDrvData);
static void ready_input(ErlDrvData, ErlDrvEvent);
static void ready_output(ErlDrvData, ErlDrvEvent);
@@ -1143,8 +1174,12 @@ struct erl_drv_entry fd_driver_entry = {
fd_control,
NULL,
outputv,
- NULL, /* ready_async */
- NULL, /* flush */
+#if FDBLOCK
+ fd_ready_async, /* ready_async */
+#else
+ NULL,
+#endif
+ fd_flush, /* flush */
NULL, /* call */
NULL, /* event */
ERL_DRV_EXTENDED_MARKER,
@@ -1198,13 +1233,28 @@ static RETSIGTYPE onchld(int signum)
#endif
}
+static int set_blocking_data(struct driver_data *dd) {
+
+ dd->blocking = erts_alloc(ERTS_ALC_T_SYS_BLOCKING, sizeof(ErtsSysBlocking));
+
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, sizeof(ErtsSysBlocking));
+
+ dd->blocking->pdl = driver_pdl_create(dd->port_num);
+ dd->blocking->res = 0;
+ dd->blocking->err = 0;
+ dd->blocking->pkey = driver_async_port_key(dd->port_num);
+
+ return 1;
+}
+
static int set_driver_data(ErlDrvPort port_num,
int ifd,
int ofd,
int packet_bytes,
int read_write,
int exit_status,
- int pid)
+ int pid,
+ int is_blocking)
{
Port *prt;
ErtsSysReportExit *report_exit;
@@ -1236,8 +1286,13 @@ static int set_driver_data(ErlDrvPort port_num,
driver_data[ifd].pid = pid;
driver_data[ifd].alive = 1;
driver_data[ifd].status = 0;
+ driver_data[ifd].terminating = 0;
+ driver_data[ifd].blocking = NULL;
if (read_write & DO_WRITE) {
driver_data[ifd].ofd = ofd;
+ if (is_blocking && FDBLOCK)
+ if (!set_blocking_data(driver_data+ifd))
+ return -1;
if (ifd != ofd)
driver_data[ofd] = driver_data[ifd]; /* structure copy */
} else { /* DO_READ only */
@@ -1253,6 +1308,11 @@ static int set_driver_data(ErlDrvPort port_num,
driver_data[ofd].pid = pid;
driver_data[ofd].alive = 1;
driver_data[ofd].status = 0;
+ driver_data[ofd].terminating = 0;
+ driver_data[ofd].blocking = NULL;
+ if (is_blocking && FDBLOCK)
+ if (!set_blocking_data(driver_data+ofd))
+ return -1;
return(ofd);
}
}
@@ -1262,11 +1322,13 @@ static int spawn_init()
int i;
#if CHLDWTHR
erts_thr_opts_t thr_opts = ERTS_THR_OPTS_DEFAULT_INITER;
+
thr_opts.detached = 0;
thr_opts.suggested_stack_size = 0; /* Smallest possible */
+ thr_opts.name = "child_waiter";
#endif
- sys_sigset(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
+ sys_signal(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_nob(&sys_misc_mem_sz,
@@ -1279,7 +1341,7 @@ static int spawn_init()
sys_sigblock(SIGCHLD);
#endif
- sys_sigset(SIGCHLD, onchld); /* Reap children */
+ sys_signal(SIGCHLD, onchld); /* Reap children */
#if CHLDWTHR
erts_thr_create(&child_waiter_tid, child_waiter, NULL, &thr_opts);
@@ -1745,7 +1807,7 @@ static ErlDrvData spawn_start(ErlDrvPort port_num, char* name, SysDriverOpts* op
}
res = set_driver_data(port_num, ifd[0], ofd[1], opts->packet_bytes,
- opts->read_write, opts->exit_status, pid);
+ opts->read_write, opts->exit_status, pid, 0);
/* Don't unblock SIGCHLD until now, since the call above must
first complete putting away the info about our new subprocess. */
unblock_signals();
@@ -1830,6 +1892,7 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
SysDriverOpts* opts)
{
ErlDrvData res;
+ int non_blocking = 0;
if (((opts->read_write & DO_READ) && opts->ifd >= max_files) ||
((opts->read_write & DO_WRITE) && opts->ofd >= max_files))
@@ -1902,6 +1965,20 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
* case - it can be called with any old pre-existing file descriptors,
* the relations between which (if they're even two) we can only guess
* at - still, we try our best...
+ *
+ * Added note OTP 18: Some systems seem to use stdout/stderr to log data
+ * using unix pipes, so we cannot allow the system to block on a write.
+ * Therefore we use an async thread to write the data to fd's that could
+ * not be set to non-blocking. When no async threads are available we
+ * fall back on the old behaviour.
+ *
+ * Also the guarantee about what is delivered to the OS has changed.
+ * Pre 18 the fd driver did no flushing of data before terminating.
+ * Now it does. This is because we want to be able to guarantee that things
+ * such as escripts and friends really have outputted all data before
+ * terminating. This could potentially block the termination of the system
+ * for a very long time, but if the user wants to terminate fast she should
+ * use erlang:halt with flush=false.
*/
if (opts->read_write & DO_READ) {
@@ -1924,6 +2001,7 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
imagine a scenario where setting non-blocking mode
here would cause problems - go ahead and do it. */
+ non_blocking = 1;
SET_NONBLOCKING(opts->ofd);
} else { /* output fd is a tty, input fd isn't */
@@ -1966,6 +2044,7 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
(nfd = open(tty, O_WRONLY)) != -1) {
dup2(nfd, opts->ofd);
close(nfd);
+ non_blocking = 1;
SET_NONBLOCKING(opts->ofd);
}
}
@@ -1974,8 +2053,9 @@ static ErlDrvData fd_start(ErlDrvPort port_num, char* name,
}
CHLD_STAT_LOCK;
res = (ErlDrvData)(long)set_driver_data(port_num, opts->ifd, opts->ofd,
- opts->packet_bytes,
- opts->read_write, 0, -1);
+ opts->packet_bytes,
+ opts->read_write, 0, -1,
+ !non_blocking);
CHLD_STAT_UNLOCK;
return res;
}
@@ -2001,14 +2081,30 @@ static void nbio_stop_fd(ErlDrvPort prt, int fd)
SET_BLOCKING(fd);
}
-static void fd_stop(ErlDrvData fd) /* Does not close the fds */
+static void fd_stop(ErlDrvData ev) /* Does not close the fds */
{
int ofd;
+ int fd = (int)(long)ev;
+ ErlDrvPort prt = driver_data[fd].port_num;
- nbio_stop_fd(driver_data[(int)(long)fd].port_num, (int)(long)fd);
- ofd = driver_data[(int)(long)fd].ofd;
- if (ofd != (int)(long)fd && ofd != -1)
- nbio_stop_fd(driver_data[(int)(long)fd].port_num, (int)(long)ofd);
+#if FDBLOCK
+ if (driver_data[fd].blocking) {
+ erts_free(ERTS_ALC_T_SYS_BLOCKING,driver_data[fd].blocking);
+ driver_data[fd].blocking = NULL;
+ erts_smp_atomic_add_nob(&sys_misc_mem_sz, -1*sizeof(ErtsSysBlocking));
+ }
+#endif
+
+ nbio_stop_fd(prt, fd);
+ ofd = driver_data[fd].ofd;
+ if (ofd != fd && ofd != -1)
+ nbio_stop_fd(prt, ofd);
+}
+
+static void fd_flush(ErlDrvData fd)
+{
+ if (!driver_data[(int)(long)fd].terminating)
+ driver_data[(int)(long)fd].terminating = 1;
}
static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
@@ -2031,8 +2127,8 @@ static ErlDrvData vanilla_start(ErlDrvPort port_num, char* name,
CHLD_STAT_LOCK;
res = (ErlDrvData)(long)set_driver_data(port_num, fd, fd,
- opts->packet_bytes,
- opts->read_write, 0, -1);
+ opts->packet_bytes,
+ opts->read_write, 0, -1, 0);
CHLD_STAT_UNLOCK;
return res;
}
@@ -2069,6 +2165,7 @@ static void stop(ErlDrvData fd)
}
}
+/* used by fd_driver */
static void outputv(ErlDrvData e, ErlIOVec* ev)
{
int fd = (int)(long)e;
@@ -2094,12 +2191,21 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
ev->iov[0].iov_base = lbp;
ev->iov[0].iov_len = pb;
ev->size += pb;
+
+ if (driver_data[fd].blocking && FDBLOCK)
+ driver_pdl_lock(driver_data[fd].blocking->pdl);
+
if ((sz = driver_sizeq(ix)) > 0) {
driver_enqv(ix, ev, 0);
+
+ if (driver_data[fd].blocking && FDBLOCK)
+ driver_pdl_unlock(driver_data[fd].blocking->pdl);
+
if (sz + ev->size >= (1 << 13))
set_busy_port(ix, 1);
}
- else {
+ else if (!driver_data[fd].blocking || !FDBLOCK) {
+ /* We try to write directly if the fd in non-blocking */
int vsize = ev->vsize > MAX_VSIZE ? MAX_VSIZE : ev->vsize;
n = writev(ofd, (const void *) (ev->iov), vsize);
@@ -2115,10 +2221,22 @@ static void outputv(ErlDrvData e, ErlIOVec* ev)
driver_enqv(ix, ev, n); /* n is the skip value */
driver_select(ix, ofd, ERL_DRV_WRITE|ERL_DRV_USE, 1);
}
+#if FDBLOCK
+ else {
+ if (ev->size != 0) {
+ driver_enqv(ix, ev, 0);
+ driver_pdl_unlock(driver_data[fd].blocking->pdl);
+ driver_async(ix, &driver_data[fd].blocking->pkey,
+ fd_async, driver_data+fd, NULL);
+ } else {
+ driver_pdl_unlock(driver_data[fd].blocking->pdl);
+ }
+ }
+#endif
/* return 0;*/
}
-
+/* Used by spawn_driver and vanilla driver */
static void output(ErlDrvData e, char* buf, ErlDrvSizeT len)
{
int fd = (int)(long)e;
@@ -2181,6 +2299,23 @@ static int port_inp_failure(ErlDrvPort port_num, int ready_fd, int res)
ASSERT(res <= 0);
(void) driver_select(port_num, ready_fd, ERL_DRV_READ|ERL_DRV_WRITE, 0);
clear_fd_data(ready_fd);
+
+ if (driver_data[ready_fd].blocking && FDBLOCK) {
+ driver_pdl_lock(driver_data[ready_fd].blocking->pdl);
+ if (driver_sizeq(driver_data[ready_fd].port_num) > 0) {
+ driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+ /* We have stuff in the output queue, so we just
+ set the state to terminating and wait for fd_async_ready
+ to terminate the port */
+ if (res == 0)
+ driver_data[ready_fd].terminating = 2;
+ else
+ driver_data[ready_fd].terminating = -err;
+ return 0;
+ }
+ driver_pdl_unlock(driver_data[ready_fd].blocking->pdl);
+ }
+
if (res == 0) {
if (driver_data[ready_fd].report_exit) {
CHLD_STAT_LOCK;
@@ -2231,6 +2366,7 @@ static void ready_input(ErlDrvData e, ErlDrvEvent ready_fd)
port_num = driver_data[fd].port_num;
packet_bytes = driver_data[fd].packet_bytes;
+
if (packet_bytes == 0) {
byte *read_buf = (byte *) erts_alloc(ERTS_ALC_T_SYS_READ_BUF,
ERTS_SYS_READ_BUF_SZ);
@@ -2354,6 +2490,8 @@ static void ready_output(ErlDrvData e, ErlDrvEvent ready_fd)
if ((iv = (struct iovec*) driver_peekq(ix, &vsize)) == NULL) {
driver_select(ix, ready_fd, ERL_DRV_WRITE, 0);
+ if (driver_data[fd].terminating)
+ driver_failure_atom(driver_data[fd].port_num,"normal");
return; /* 0; */
}
vsize = vsize > MAX_VSIZE ? MAX_VSIZE : vsize;
@@ -2379,6 +2517,86 @@ static void stop_select(ErlDrvEvent fd, void* _)
close((int)fd);
}
+#if FDBLOCK
+
+static void
+fd_async(void *async_data)
+{
+ int res;
+ struct driver_data *dd = (struct driver_data*)async_data;
+ SysIOVec *iov0;
+ SysIOVec *iov;
+ int iovlen;
+ int err = 0;
+ /* much of this code is stolen from efile_drv:invoke_writev */
+ driver_pdl_lock(dd->blocking->pdl);
+ iov0 = driver_peekq(dd->port_num, &iovlen);
+ iovlen = iovlen < MAXIOV ? iovlen : MAXIOV;
+ iov = erts_alloc_fnf(ERTS_ALC_T_SYS_WRITE_BUF,
+ sizeof(SysIOVec)*iovlen);
+ if (!iov) {
+ res = -1;
+ err = ENOMEM;
+ driver_pdl_unlock(dd->blocking->pdl);
+ } else {
+ memcpy(iov,iov0,iovlen*sizeof(SysIOVec));
+ driver_pdl_unlock(dd->blocking->pdl);
+
+ do {
+ res = writev(dd->ofd, iov, iovlen);
+ } while (res < 0 && errno == EINTR);
+ if (res < 0)
+ err = errno;
+
+ erts_free(ERTS_ALC_T_SYS_WRITE_BUF, iov);
+ }
+ dd->blocking->res = res;
+ dd->blocking->err = err;
+}
+
+void fd_ready_async(ErlDrvData drv_data,
+ ErlDrvThreadData thread_data) {
+ struct driver_data *dd = (struct driver_data *)thread_data;
+ ErlDrvPort port_num = dd->port_num;
+
+ ASSERT(dd->blocking);
+ ASSERT(dd == (driver_data + (int)(long)drv_data));
+
+ if (dd->blocking->res > 0) {
+ driver_pdl_lock(dd->blocking->pdl);
+ if (driver_deq(port_num, dd->blocking->res) == 0) {
+ driver_pdl_unlock(dd->blocking->pdl);
+ set_busy_port(port_num, 0);
+ if (dd->terminating) {
+ /* The port is has been ordered to terminate
+ from either fd_flush or port_inp_failure */
+ if (dd->terminating == 1)
+ driver_failure_atom(port_num, "normal");
+ else if (dd->terminating == 2)
+ driver_failure_eof(port_num);
+ else if (dd->terminating < 0)
+ driver_failure_posix(port_num, -dd->terminating);
+ return; /* -1; */
+ }
+ } else {
+ driver_pdl_unlock(dd->blocking->pdl);
+ /* still data left to write in queue */
+ driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
+ return /* 0; */;
+ }
+ } else if (dd->blocking->res < 0) {
+ if (dd->blocking->err == ERRNO_BLOCK) {
+ set_busy_port(port_num, 1);
+ /* still data left to write in queue */
+ driver_async(port_num, &dd->blocking->pkey, fd_async, dd, NULL);
+ } else
+ driver_failure_posix(port_num, dd->blocking->err);
+ return; /* -1; */
+ }
+ return; /* 0; */
+}
+
+#endif
void erts_do_break_handling(void)
{
@@ -2648,18 +2866,30 @@ void sys_preload_end(Preload* p)
/* Nothing */
}
-/* Read a key from console (?) */
-
+/* Read a key from console, used by break.c
+ Here we assume that all schedulers are stopped so that erl_poll
+ does not interfere with the select below.
+*/
int sys_get_key(fd)
int fd;
{
- int c;
+ int c, ret;
unsigned char rbuf[64];
+ fd_set fds;
fflush(stdout); /* Flush query ??? */
- if ((c = read(fd,rbuf,64)) <= 0) {
- return c;
+ FD_ZERO(&fds);
+ FD_SET(fd,&fds);
+
+ ret = select(fd+1, &fds, NULL, NULL, NULL);
+
+ if (ret == 1) {
+ do {
+ c = read(fd,rbuf,64);
+ } while (c < 0 && errno == EAGAIN);
+ if (c <= 0)
+ return c;
}
return rbuf[0];
@@ -2983,13 +3213,6 @@ signal_dispatcher_thread_func(void *unused)
case '1': /* SIGUSR1 */
sigusr1_exit();
break;
-#ifdef QUANTIFY
- case '2': /* SIGUSR2 */
- quantify_save_data(); /* Might take a substantial amount of
- time, but this is a test/debug
- build */
- break;
-#endif
default:
erl_exit(ERTS_ABORT_EXIT,
"signal-dispatcher thread received unknown "
@@ -3007,6 +3230,7 @@ init_smp_sig_notify(void)
{
erts_smp_thr_opts_t thr_opts = ERTS_SMP_THR_OPTS_DEFAULT_INITER;
thr_opts.detached = 1;
+ thr_opts.name = "sys_sig_dispatcher";
if (pipe(sig_notify_fds) < 0) {
erl_exit(ERTS_ABORT_EXIT,
@@ -3021,6 +3245,17 @@ init_smp_sig_notify(void)
NULL,
&thr_opts);
}
+
+static void
+init_smp_sig_suspend(void) {
+ if (pipe(sig_suspend_fds) < 0) {
+ erl_exit(ERTS_ABORT_EXIT,
+ "Failed to create sig_suspend pipe: %s (%d)\n",
+ erl_errno_id(errno),
+ errno);
+ }
+}
+
#ifdef __DARWIN__
int erts_darwin_main_thread_pipe[2];
@@ -3048,9 +3283,11 @@ erts_sys_main_thread(void)
#endif
smp_sig_notify(0); /* Notify initialized */
- while (1) {
- /* Wait for a signal to arrive... */
+
+ /* Wait for a signal to arrive... */
+
#ifdef __DARWIN__
+ while (1) {
/*
* The wx driver needs to be able to steal the main thread for Cocoa to
* work properly.
@@ -3065,12 +3302,24 @@ erts_sys_main_thread(void)
void* (*func)(void*);
void* arg;
void *resp;
- read(erts_darwin_main_thread_pipe[0],&func,sizeof(void* (*)(void*)));
- read(erts_darwin_main_thread_pipe[0],&arg, sizeof(void*));
+ res = read(erts_darwin_main_thread_pipe[0],&func,sizeof(void* (*)(void*)));
+ if (res != sizeof(void* (*)(void*)))
+ break;
+ res = read(erts_darwin_main_thread_pipe[0],&arg,sizeof(void*));
+ if (res != sizeof(void*))
+ break;
resp = (*func)(arg);
write(erts_darwin_main_thread_result_pipe[1],&resp,sizeof(void *));
}
-#else
+
+ if (res == -1 && errno != EINTR)
+ break;
+ }
+ /* Something broke with the main thread pipe, so we ignore it for now.
+ Most probably erts has closed this pipe and is about to exit. */
+#endif /* #ifdef __DARWIN__ */
+
+ while (1) {
#ifdef DEBUG
int res =
#else
@@ -3079,7 +3328,6 @@ erts_sys_main_thread(void)
select(0, NULL, NULL, NULL, NULL);
ASSERT(res < 0);
ASSERT(errno == EINTR);
-#endif
}
}
@@ -3171,6 +3419,7 @@ erl_sys_args(int* argc, char** argv)
#ifdef ERTS_SMP
init_smp_sig_notify();
+ init_smp_sig_suspend();
#endif
/* Handled arguments have been marked with NULL. Slide arguments