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thread_pthread.c (ubf_select): refix [Bug #5343]

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We still need to to designate a timer thread after registering target
thread for the ubf list.

Oops :x

Note: I was never able to reproduce
test/thread/test_queue.rb::test_thr_kill failures on my on
Debian machines.

[ruby-core:88088] [Misc #14937] [Bug #5343]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64108 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
normal 2018-07-29 22:19:15 +00:00
parent 708bfd2115
commit 4c1ab82f06
1 changed files with 17 additions and 0 deletions
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17
thread_pthread.c
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@ -1172,8 +1172,25 @@ static void
ubf_select(void *ptr)
{
rb_thread_t *th = (rb_thread_t *)ptr;
rb_vm_t *vm = th->vm;
register_ubf_list(th);
/*
* ubf_wakeup_thread() doesn't guarantee to wake up a target thread.
* Therefore, we repeatedly call ubf_wakeup_thread() until a target thread
* exit from ubf function. We must designate a timer-thread to perform
* this operation.
*/
rb_native_mutex_lock(&vm->gvl.lock);
if (!vm->gvl.timer) {
native_thread_data_t *last;
last = list_tail(&vm->gvl.waitq, native_thread_data_t, ubf_list);
if (last) rb_native_cond_signal(&last->sleep_cond);
}
rb_native_mutex_unlock(&vm->gvl.lock);
ubf_wakeup_thread(th);
}