diff options
Diffstat (limited to 'libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c')
-rw-r--r-- | libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c b/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c new file mode 100644 index 0000000..8cdd8ec --- /dev/null +++ b/libc-top-half/musl/src/thread/pthread_rwlock_timedrdlock.c @@ -0,0 +1,25 @@ +#include "pthread_impl.h" + +int __pthread_rwlock_timedrdlock(pthread_rwlock_t *restrict rw, const struct timespec *restrict at) +{ + int r, t; + + r = pthread_rwlock_tryrdlock(rw); + if (r != EBUSY) return r; + + int spins = 100; + while (spins-- && rw->_rw_lock && !rw->_rw_waiters) a_spin(); + + while ((r=__pthread_rwlock_tryrdlock(rw))==EBUSY) { + if (!(r=rw->_rw_lock) || (r&0x7fffffff)!=0x7fffffff) 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_timedrdlock, pthread_rwlock_timedrdlock); |