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_tryrdlock.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) create mode 100644 src/thread/pthread_rwlock_tryrdlock.c (limited to 'src/thread/pthread_rwlock_tryrdlock.c') diff --git a/src/thread/pthread_rwlock_tryrdlock.c b/src/thread/pthread_rwlock_tryrdlock.c new file mode 100644 index 0000000..c13bc9c --- /dev/null +++ b/src/thread/pthread_rwlock_tryrdlock.c @@ -0,0 +1,15 @@ +#include "pthread_impl.h" + +int __pthread_rwlock_tryrdlock(pthread_rwlock_t *rw) +{ + int val, cnt; + do { + val = rw->_rw_lock; + cnt = val & 0x7fffffff; + if (cnt == 0x7fffffff) return EBUSY; + if (cnt == 0x7ffffffe) return EAGAIN; + } while (a_cas(&rw->_rw_lock, val, val+1) != val); + return 0; +} + +weak_alias(__pthread_rwlock_tryrdlock, pthread_rwlock_tryrdlock); -- cgit v1.2.3