From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/thread/pthread_rwlock_timedwrlock.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 src/thread/pthread_rwlock_timedwrlock.c (limited to 'src/thread/pthread_rwlock_timedwrlock.c') diff --git a/src/thread/pthread_rwlock_timedwrlock.c b/src/thread/pthread_rwlock_timedwrlock.c new file mode 100644 index 0000000..d77706e --- /dev/null +++ b/src/thread/pthread_rwlock_timedwrlock.c @@ -0,0 +1,25 @@ +#include "pthread_impl.h" + +int __pthread_rwlock_timedwrlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at) +{ + int r, t; + + r = pthread_rwlock_trywrlock(rw); + if (r != EBUSY) return r; + + int spins = 100; + while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin(); + + while ((r=__pthread_rwlock_trywrlock(rw))==EBUSY) { + if (!(r=rw->_rw_lock)) continue; + t = r | 0x80000000; + a_inc(&rw->_rw_waiters); + a_cas(&rw->_rw_lock, r, t); + r = __timedwait(&rw->_rw_lock, t, CLOCK_REALTIME, at, rw->_rw_shared^128); + a_dec(&rw->_rw_waiters); + if (r && r != EINTR) return r; + } + return r; +} + +weak_alias(__pthread_rwlock_timedwrlock, pthread_rwlock_timedwrlock); -- cgit v1.2.3