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thread_sync.c (rb_mutex_sleep): disable interrupt checking in ensure

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This is needed to reliably fix ConditionVariable#wait on Thread#kill
[Bug #14999] because there is still a chance an interrupt could fire
and prevent lock acquisition after an ensure statement.

Arguably, rb_mutex_lock itself should be uninterruptible, but that
already prevents bootstraptest/test_thread.rb from completing and
probably breaks existing use cases.

For reference, POSIX expressly forbids EINTR from pthread_mutex_lock.

[ruby-core:88556] [Bug #14999]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64476 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-08-19 22:20:22 +00:00
parent 6056dae7f4
commit d9cb901779
1 changed files with 31 additions and 16 deletions
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47
thread_sync.c
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@ -221,15 +221,8 @@ rb_mutex_trylock(VALUE self)
*/
static const rb_thread_t *patrol_thread = NULL;
/*
* call-seq:
* mutex.lock -> self
*
* Attempts to grab the lock and waits if it isn't available.
* Raises +ThreadError+ if +mutex+ was locked by the current thread.
*/
VALUE
rb_mutex_lock(VALUE self)
static VALUE
do_mutex_lock(VALUE self, int interruptible_p)
{
rb_thread_t *th = GET_THREAD();
rb_mutex_t *mutex;
@ -290,16 +283,37 @@ rb_mutex_lock(VALUE self)
th->vm->sleeper--;
if (mutex->th == th) mutex_locked(th, self);
RUBY_VM_CHECK_INTS_BLOCKING(th->ec); /* may release mutex */
if (!mutex->th) {
mutex->th = th;
mutex_locked(th, self);
}
if (interruptible_p) {
RUBY_VM_CHECK_INTS_BLOCKING(th->ec); /* may release mutex */
if (!mutex->th) {
mutex->th = th;
mutex_locked(th, self);
}
}
}
}
return self;
}
static VALUE
mutex_lock_uninterruptible(VALUE self)
{
return do_mutex_lock(self, 0);
}
/*
* call-seq:
* mutex.lock -> self
*
* Attempts to grab the lock and waits if it isn't available.
* Raises +ThreadError+ if +mutex+ was locked by the current thread.
*/
VALUE
rb_mutex_lock(VALUE self)
{
return do_mutex_lock(self, 1);
}
/*
* call-seq:
* mutex.owned? -> true or false
@ -462,14 +476,15 @@ rb_mutex_sleep(VALUE self, VALUE timeout)
rb_mutex_unlock(self);
beg = time(0);
if (NIL_P(timeout)) {
rb_ensure(rb_mutex_sleep_forever, Qnil, rb_mutex_lock, self);
rb_ensure(rb_mutex_sleep_forever, Qnil, mutex_lock_uninterruptible, self);
}
else {
struct timespec ts;
VALUE tsp = (VALUE)timespec_for(&ts, &t);
rb_ensure(rb_mutex_wait_for, tsp, rb_mutex_lock, self);
rb_ensure(rb_mutex_wait_for, tsp, mutex_lock_uninterruptible, self);
}
RUBY_VM_CHECK_INTS_BLOCKING(GET_EC());
end = time(0) - beg;
return INT2FIX(end);
}