diff options
author | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-08-19 22:20:22 +0000 |
---|---|---|
committer | normal <normal@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2018-08-19 22:20:22 +0000 |
commit | d9cb9017794a23924488266ee0b475d78fbf3bb3 (patch) | |
tree | 49baea1b3d8db79df4cf6a86bb6d89974a8fa354 /thread_sync.c | |
parent | 6056dae7f43492b6f1ad1708552e7a9c4994d9eb (diff) |
thread_sync.c (rb_mutex_sleep): disable interrupt checking in ensure
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
Diffstat (limited to 'thread_sync.c')
-rw-r--r-- | thread_sync.c | 47 |
1 files changed, 31 insertions, 16 deletions
diff --git a/thread_sync.c b/thread_sync.c index 19f14fa958..79eb1768c4 100644 --- a/thread_sync.c +++ b/thread_sync.c @@ -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); } |