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Fix a race in pthread_rwlock caused by simultanoues unlock and cancelation.

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* thread.h (pthread_rwlock::release): New method.
* thread.cc (pthread_rwlock::unlock): Use release to signal
waiting threads.
(pthread_rwlock::rdlock_cleanup): Signal waiting threads after a
cancelation.
(pthread_rwlock::wrlock_cleanup): Ditto.
This commit is contained in:
Thomas Pfaff
2003-04-15 20:14:12 +00:00
parent cfd2c7bea8
commit ffb576fbf2
3 changed files with 24 additions and 7 deletions
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10
winsup/cygwin/thread.cc
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@@ -1210,13 +1210,7 @@ pthread_rwlock::unlock ()
delete reader;
}
if (waiting_writers)
{
if (!readers)
cond_writers.unblock (false);
}
else if (waiting_readers)
cond_readers.unblock (true);
release ();
DONE:
mtx.unlock ();
@@ -1263,6 +1257,7 @@ pthread_rwlock::rdlock_cleanup (void *arg)
pthread_rwlock *rwlock = (pthread_rwlock *) arg;
--(rwlock->waiting_readers);
rwlock->release ();
rwlock->mtx.unlock ();
}
@@ -1272,6 +1267,7 @@ pthread_rwlock::wrlock_cleanup (void *arg)
pthread_rwlock *rwlock = (pthread_rwlock *) arg;
--(rwlock->waiting_writers);
rwlock->release ();
rwlock->mtx.unlock ();
}