From: Eric Wong <e@80x24.org>
To: spew@80x24.org
Subject: [PATCH] wip
Date: Sun, 24 Jun 2018 08:39:12 +0000 [thread overview]
Message-ID: <20180624083912.1362-1-e@80x24.org> (raw)
From: Eric Wong <normalperson@yhbt.net>
---
mjit.c | 11 +++-
process.c | 160 ++++++++++++++++++++++++++----------------------------
signal.c | 30 +++++-----
thread.c | 3 +
4 files changed, 104 insertions(+), 100 deletions(-)
diff --git a/mjit.c b/mjit.c
index 55ff7e21ee..685a57dfb8 100644
--- a/mjit.c
+++ b/mjit.c
@@ -111,7 +111,8 @@ extern void rb_native_cond_wait(rb_nativethread_cond_t *cond, rb_nativethread_lo
extern int rb_thread_create_mjit_thread(void (*child_hook)(void), void (*worker_func)(void));
-pid_t ruby_waitpid_locked(rb_vm_t *, rb_pid_t, int *status, int options);
+pid_t ruby_waitpid_locked(rb_vm_t *, rb_pid_t, int *status, int options,
+ rb_nativethread_cond_t *cond);
#define RB_CONDATTR_CLOCK_MONOTONIC 1
@@ -385,7 +386,9 @@ exec_process(const char *path, char *const argv[])
int stat, exit_code;
pid_t pid;
rb_vm_t *vm = GET_VM();
+ rb_nativethread_cond_t cond;
+ rb_native_cond_initialize(&cond);
rb_nativethread_lock_lock(&vm->waitpid_lock);
pid = start_process(path, argv);
if (pid <= 0) {
@@ -393,10 +396,11 @@ exec_process(const char *path, char *const argv[])
return -2;
}
for (;;) {
- pid_t r = ruby_waitpid_locked(vm, pid, &stat, 0);
+ pid_t r = ruby_waitpid_locked(vm, pid, &stat, 0, &cond);
if (r == -1) {
- if (errno == EINTR) continue;
+ if (errno == EINTR) continue; /* should never happen */
fprintf(stderr, "waitpid: %s\n", strerror(errno));
+ exit_code = -2;
break;
}
else if (r == pid) {
@@ -410,6 +414,7 @@ exec_process(const char *path, char *const argv[])
}
}
rb_nativethread_lock_unlock(&vm->waitpid_lock);
+ rb_native_cond_destroy(&cond);
return exit_code;
}
diff --git a/process.c b/process.c
index bdb92036b7..3b293b8d6b 100644
--- a/process.c
+++ b/process.c
@@ -899,153 +899,145 @@ do_waitpid(rb_pid_t pid, int *st, int flags)
struct waitpid_state {
struct list_node wnode;
- rb_nativethread_cond_t cond;
+ union {
+ rb_nativethread_cond_t *cond; /* non-Ruby thread */
+ rb_execution_context_t *ec; /* normal Ruby execution context */
+ } wake;
+ struct rb_unblock_callback ubf;
rb_pid_t ret;
rb_pid_t pid;
int status;
int options;
int errnum;
- rb_vm_t *vm;
+ unsigned int is_ruby : 1;
};
+void rb_native_mutex_lock(rb_nativethread_lock_t *);
+void rb_native_mutex_unlock(rb_nativethread_lock_t *);
void rb_native_cond_signal(rb_nativethread_cond_t *);
void rb_native_cond_wait(rb_nativethread_cond_t *, rb_nativethread_lock_t *);
-void rb_native_cond_initialize(rb_nativethread_cond_t *);
-void rb_native_cond_destroy(rb_nativethread_cond_t *);
-/* only called by vm->main_thread */
+/* called by timer-thread */
void
-rb_sigchld(rb_vm_t *vm)
+ruby_waitpid_all(rb_vm_t *vm)
{
struct waitpid_state *w = 0, *next;
- rb_nativethread_lock_lock(&vm->waitpid_lock);
+ rb_native_mutex_lock(&vm->waitpid_lock);
list_for_each_safe(&vm->waiting_pids, w, next, wnode) {
w->ret = do_waitpid(w->pid, &w->status, w->options | WNOHANG);
+
if (w->ret == 0) continue;
if (w->ret == -1) w->errnum = errno;
+
list_del_init(&w->wnode);
- rb_native_cond_signal(&w->cond);
+ if (w->is_ruby) {
+ /*
+ * we call this in timer-thread, because vm->main_thread
+ * cannot wake itself up...
+ */
+ rb_thread_wakeup_alive(rb_ec_thread_ptr(w->wake.ec)->self);
+ }
+ else {
+ rb_native_cond_signal(w->wake.cond);
+ }
}
- rb_nativethread_lock_unlock(&vm->waitpid_lock);
+ rb_native_mutex_unlock(&vm->waitpid_lock);
}
static void
-waitpid_state_init(struct waitpid_state *w, rb_vm_t *vm, pid_t pid, int options)
+waitpid_state_init(struct waitpid_state *w, pid_t pid, int options)
{
- rb_native_cond_initialize(&w->cond);
w->ret = 0;
w->pid = pid;
w->status = 0;
w->options = options;
- w->vm = vm;
list_node_init(&w->wnode);
+ w->is_ruby = ruby_thread_has_gvl_p();
}
-/* must be called with vm->waitpid_lock held, this is not interruptible */
+/*
+ * must be called with vm->waitpid_lock held, this is not interruptible
+ */
pid_t
-ruby_waitpid_locked(rb_vm_t *vm, rb_pid_t pid, int *status, int options)
+ruby_waitpid_locked(rb_vm_t *vm, rb_pid_t pid, int *status, int options,
+ rb_nativethread_cond_t *cond)
{
struct waitpid_state w;
assert(!ruby_thread_has_gvl_p() && "must not have GVL");
- waitpid_state_init(&w, vm, pid, options);
+ waitpid_state_init(&w, pid, options);
w.ret = do_waitpid(w.pid, &w.status, w.options | WNOHANG);
if (w.ret) {
- if (w.ret == -1) {
- w.errnum = errno;
- }
+ if (w.ret == -1) w.errnum = errno;
}
else {
+ w.wake.cond = cond;
list_add(&vm->waiting_pids, &w.wnode);
- while (!w.ret) {
- rb_native_cond_wait(&w.cond, &vm->waitpid_lock);
- }
+ do {
+ rb_native_cond_wait(w.wake.cond, &vm->waitpid_lock);
+ } while (!w.ret);
list_del(&w.wnode);
}
if (status) {
*status = w.status;
}
- rb_native_cond_destroy(&w.cond);
errno = w.errnum;
return w.ret;
}
-static void
-waitpid_ubf(void *x)
-{
- struct waitpid_state *w = x;
- rb_nativethread_lock_lock(&w->vm->waitpid_lock);
- if (!w->ret) {
- w->errnum = EINTR;
- w->ret = -1;
- }
- rb_native_cond_signal(&w->cond);
- rb_nativethread_lock_unlock(&w->vm->waitpid_lock);
-}
-
-static void *
-waitpid_nogvl(void *x)
+static VALUE
+waitpid_sleep(VALUE x)
{
- struct waitpid_state *w = x;
+ struct waitpid_state *w = (struct waitpid_state *)x;
- /* let rb_sigchld handle it */
- rb_native_cond_wait(&w->cond, &w->vm->waitpid_lock);
+ do {
+ rb_thread_sleep_forever(); /* handles interrupts for us */
+ } while (!w->ret);
- return 0;
+ return Qfalse;
}
static VALUE
-waitpid_wait(VALUE x)
+waitpid_ensure(VALUE x)
{
struct waitpid_state *w = (struct waitpid_state *)x;
- rb_nativethread_lock_lock(&w->vm->waitpid_lock);
- w->ret = do_waitpid(w->pid, &w->status, w->options | WNOHANG);
- if (w->ret) {
- if (w->ret == -1) {
- w->errnum = errno;
- }
- }
- else {
- rb_execution_context_t *ec = GET_EC();
+ if (w->ret <= 0) {
+ rb_vm_t *vm = rb_ec_vm_ptr(w->wake.ec);
- list_add(&w->vm->waiting_pids, &w->wnode);
- do {
- rb_thread_call_without_gvl2(waitpid_nogvl, w, waitpid_ubf, w);
- if (RUBY_VM_INTERRUPTED_ANY(ec) ||
- (w->ret == -1 && w->errnum == EINTR)) {
- rb_nativethread_lock_unlock(&w->vm->waitpid_lock);
-
- RUBY_VM_CHECK_INTS(ec);
-
- rb_nativethread_lock_lock(&w->vm->waitpid_lock);
- if (w->ret == -1 && w->errnum == EINTR) {
- w->ret = do_waitpid(w->pid, &w->status, w->options|WNOHANG);
- if (w->ret == -1)
- w->errnum = errno;
- }
- }
- } while (!w->ret);
+ rb_native_mutex_lock(&vm->waitpid_lock);
+ list_del(&w->wnode);
+ rb_native_mutex_unlock(&vm->waitpid_lock);
}
- rb_nativethread_lock_unlock(&w->vm->waitpid_lock);
return Qfalse;
}
-static VALUE
-waitpid_ensure(VALUE x)
+static void
+waitpid_wait(struct waitpid_state *w)
{
- struct waitpid_state *w = (struct waitpid_state *)x;
+ rb_vm_t *vm = rb_ec_vm_ptr(w->wake.ec);
- if (w->ret <= 0) {
- rb_nativethread_lock_lock(&w->vm->waitpid_lock);
- list_del_init(&w->wnode);
- rb_nativethread_lock_unlock(&w->vm->waitpid_lock);
+ /*
+ * Lock here to prevent do_waitpid from stealing work from the
+ * ruby_waitpid_locked done by mjit workers since mjit works
+ * outside of GVL
+ */
+ rb_native_mutex_lock(&vm->waitpid_lock);
+
+ w->ret = do_waitpid(w->pid, &w->status, w->options | WNOHANG);
+ if (w->ret) {
+ if (w->ret == -1) w->errnum = errno;
+
+ rb_native_mutex_unlock(&vm->waitpid_lock);
}
+ else {
+ list_add(&vm->waiting_pids, &w->wnode);
+ rb_native_mutex_unlock(&vm->waitpid_lock);
- rb_native_cond_destroy(&w->cond);
- return Qfalse;
+ rb_ensure(waitpid_sleep, (VALUE)w, waitpid_ensure, (VALUE)w);
+ }
}
rb_pid_t
@@ -1059,11 +1051,10 @@ rb_waitpid(rb_pid_t pid, int *st, int flags)
else {
struct waitpid_state w;
- waitpid_state_init(&w, GET_VM(), pid, flags);
- rb_ensure(waitpid_wait, (VALUE)&w, waitpid_ensure, (VALUE)&w);
- if (st) {
- *st = w.status;
- }
+ waitpid_state_init(&w, pid, flags);
+ w.wake.ec = GET_EC();
+ waitpid_wait(&w);
+ if (st) *st = w.status;
result = w.ret;
}
if (result > 0) {
@@ -1348,6 +1339,9 @@ after_exec_non_async_signal_safe(void)
{
rb_thread_reset_timer_thread();
rb_thread_start_timer_thread();
+ if (rb_signal_buff_size()) {
+ rb_thread_wakeup_timer_thread();
+ }
}
static void
diff --git a/signal.c b/signal.c
index c20b01ea36..e339434113 100644
--- a/signal.c
+++ b/signal.c
@@ -1052,18 +1052,23 @@ rb_trap_exit(void)
}
}
-static int
-sig_is_chld(int sig)
-{
#if defined(SIGCLD)
- return (sig == SIGCLD);
+# define RUBY_SIGCHLD (SIGCLD)
#elif defined(SIGCHLD)
- return (sig == SIGCHLD);
+# define RUBY_SIGCHLD (SIGCHLD)
+#else
+# define RUBY_SIGCHLD (0)
#endif
- return 0;
-}
-void rb_sigchld(rb_vm_t *); /* process.c */
+void ruby_waitpid_all(rb_vm_t *); /* process.c */
+
+void
+ruby_sigchld_handler(rb_vm_t *vm)
+{
+ if (signal_buff.cnt[RUBY_SIGCHLD]) {
+ ruby_waitpid_all(vm);
+ }
+}
void
rb_signal_exec(rb_thread_t *th, int sig)
@@ -1072,9 +1077,6 @@ rb_signal_exec(rb_thread_t *th, int sig)
VALUE cmd = vm->trap_list.cmd[sig];
int safe = vm->trap_list.safe[sig];
- if (sig_is_chld(sig)) {
- rb_sigchld(vm);
- }
if (cmd == 0) {
switch (sig) {
case SIGINT:
@@ -1176,7 +1178,7 @@ trap_handler(VALUE *cmd, int sig)
VALUE command;
if (NIL_P(*cmd)) {
- if (sig_is_chld(sig)) {
+ if (sig == RUBY_SIGCHLD) {
goto sig_dfl;
}
func = SIG_IGN;
@@ -1199,7 +1201,7 @@ trap_handler(VALUE *cmd, int sig)
break;
case 14:
if (memcmp(cptr, "SYSTEM_DEFAULT", 14) == 0) {
- if (sig_is_chld(sig)) {
+ if (sig == RUBY_SIGCHLD) {
goto sig_dfl;
}
func = SIG_DFL;
@@ -1209,7 +1211,7 @@ trap_handler(VALUE *cmd, int sig)
case 7:
if (memcmp(cptr, "SIG_IGN", 7) == 0) {
sig_ign:
- if (sig_is_chld(sig)) {
+ if (sig == RUBY_SIGCHLD) {
goto sig_dfl;
}
func = SIG_IGN;
diff --git a/thread.c b/thread.c
index 8c9aafe07a..613599eaa6 100644
--- a/thread.c
+++ b/thread.c
@@ -4146,6 +4146,8 @@ rb_threadptr_check_signal(rb_thread_t *mth)
}
}
+void ruby_sigchld_handler(rb_vm_t *); /* signal.c */
+
static void
timer_thread_function(void *arg)
{
@@ -4164,6 +4166,7 @@ timer_thread_function(void *arg)
rb_native_mutex_unlock(&vm->thread_destruct_lock);
/* check signal */
+ ruby_sigchld_handler(vm);
rb_threadptr_check_signal(vm->main_thread);
#if 0
--
EW
next reply other threads:[~2018-06-24 8:39 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-24 8:39 Eric Wong [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-10-27 20:16 [PATCH] wip Eric Wong
2021-06-05 19:58 Eric Wong
2021-04-05 7:42 Eric Wong
2021-03-08 7:11 Eric Wong
2021-01-21 4:24 [PATCH] WIP Eric Wong
2021-01-03 22:57 [PATCH] wip Eric Wong
2020-12-27 11:36 [PATCH] WIP Eric Wong
2020-11-15 7:35 [PATCH] wip Eric Wong
2020-04-23 4:27 Eric Wong
2020-04-20 7:14 Eric Wong
2020-01-13 9:24 [PATCH] WIP Eric Wong
2019-05-11 22:55 Eric Wong
2019-01-02 9:21 [PATCH] wip Eric Wong
2018-07-06 21:31 Eric Wong
2018-06-24 11:55 Eric Wong
2017-07-15 1:42 [PATCH] WIP Eric Wong
2017-04-12 20:17 [PATCH] wip Eric Wong
2017-04-05 18:40 Eric Wong
2016-08-23 20:07 Eric Wong
2016-08-18 2:16 Eric Wong
2016-06-26 3:46 Eric Wong
2015-12-22 0:15 Eric Wong
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