diff options
Diffstat (limited to 'sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c')
| -rw-r--r-- | sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c b/sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c index 939ed568ba..4f63955d04 100644 --- a/sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c +++ b/sysdeps/mach/hurd/htl/pt-hurd-cond-timedwait.c @@ -111,6 +111,10 @@ __pthread_hurd_cond_timedwait_internal (pthread_cond_t *cond, /* Release MUTEX before blocking. */ __pthread_mutex_unlock (mutex); + /* Increase the waiter reference count. Relaxed MO is sufficient because + we only need to synchronize when decrementing the reference count. */ + atomic_fetch_add_relaxed (&cond->__wrefs, 2); + /* Block the thread. */ if (abstime != NULL) err = __pthread_timedblock (self, abstime, clock_id); @@ -144,6 +148,13 @@ __pthread_hurd_cond_timedwait_internal (pthread_cond_t *cond, __pthread_block (self); } + /* If destruction is pending (i.e., the wake-request flag is nonzero) and we + are the last waiter (prior value of __wrefs was 1 << 1), then wake any + threads waiting in pthread_cond_destroy. Release MO to synchronize with + these threads. Don't bother clearing the wake-up request flag. */ + if ((atomic_fetch_add_release (&cond->__wrefs, -2)) == 3) + __gsync_wake (__mach_task_self (), (vm_offset_t) &cond->__wrefs, 0, 0); + /* Clear the hook, now that we are done blocking. */ ss->cancel_hook = NULL; /* Check the cancellation flag; we might have unblocked due to |