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thread_sync.c (rb_mutex_sleep): skip interrupt check before sleep

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We do not want to risk switching threads before going to sleep
because it can cause unexpected wakeups and put us in an
unexpected state when used with ConditionVariable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64464 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-08-18 20:04:07 +00:00
parent 17d20383ef
commit 2e420b8b99
2 changed files with 11 additions and 5 deletions
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7
thread.c
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@ -94,7 +94,8 @@ static ID id_locals;
enum SLEEP_FLAGS {
SLEEP_DEADLOCKABLE = 0x1,
SLEEP_SPURIOUS_CHECK = 0x2
SLEEP_SPURIOUS_CHECK = 0x2,
SLEEP_BEFORE_CHECK_INTS = 0x4
};
static void sleep_timespec(rb_thread_t *, struct timespec, unsigned int fl);
@ -1187,7 +1188,9 @@ sleep_forever(rb_thread_t *th, unsigned int fl)
status = fl & SLEEP_DEADLOCKABLE ? THREAD_STOPPED_FOREVER : THREAD_STOPPED;
th->status = status;
if (!(fl & SLEEP_BEFORE_CHECK_INTS)) {
RUBY_VM_CHECK_INTS_BLOCKING(th->ec);
}
while (th->status == status) {
if (fl & SLEEP_DEADLOCKABLE) {
th->vm->sleeper++;
@ -1293,7 +1296,9 @@ sleep_timespec(rb_thread_t *th, struct timespec ts, unsigned int fl)
getclockofday(&end);
timespec_add(&end, &ts);
th->status = THREAD_STOPPED;
if (!(fl & SLEEP_BEFORE_CHECK_INTS)) {
RUBY_VM_CHECK_INTS_BLOCKING(th->ec);
}
while (th->status == THREAD_STOPPED) {
native_sleep(th, &ts);
woke = vm_check_ints_blocking(th->ec);

5
thread_sync.c
View file

@ -438,7 +438,7 @@ rb_mutex_cleanup_keeping_mutexes(const rb_thread_t *current_thread)
static VALUE
rb_mutex_sleep_forever(VALUE time)
{
rb_thread_sleep_deadly_allow_spurious_wakeup();
sleep_forever(GET_THREAD(), SLEEP_DEADLOCKABLE|SLEEP_BEFORE_CHECK_INTS);
return Qnil;
}
@ -446,7 +446,8 @@ static VALUE
rb_mutex_wait_for(VALUE time)
{
struct timespec *t = (struct timespec*)time;
sleep_timespec(GET_THREAD(), *t, 0); /* permit spurious check */
/* permit spurious check */
sleep_timespec(GET_THREAD(), *t, SLEEP_BEFORE_CHECK_INTS);
return Qnil;
}