xref: /kvmtool/include/kvm/rwsem.h (revision a009444e08153e78da79f042ad8858da39660e1e) 
1 #ifndef KVM__RWSEM_H
2 #define KVM__RWSEM_H
3 
4 #include <pthread.h>
5 
6 #include "kvm/util.h"
7 
8 /*
9  * Kernel-alike rwsem API - to make it easier for kernel developers
10  * to write user-space code! :-)
11  */
12 
13 #define DECLARE_RWSEM(sem) pthread_rwlock_t sem = PTHREAD_RWLOCK_INITIALIZER
14 
down_read(pthread_rwlock_t * rwsem)15 static inline void down_read(pthread_rwlock_t *rwsem)
16 {
17 	if (pthread_rwlock_rdlock(rwsem) != 0)
18 		die("unexpected pthread_rwlock_rdlock() failure!");
19 }
20 
down_write(pthread_rwlock_t * rwsem)21 static inline void down_write(pthread_rwlock_t *rwsem)
22 {
23 	if (pthread_rwlock_wrlock(rwsem) != 0)
24 		die("unexpected pthread_rwlock_wrlock() failure!");
25 }
26 
up_read(pthread_rwlock_t * rwsem)27 static inline void up_read(pthread_rwlock_t *rwsem)
28 {
29 	if (pthread_rwlock_unlock(rwsem) != 0)
30 		die("unexpected pthread_rwlock_unlock() failure!");
31 }
32 
up_write(pthread_rwlock_t * rwsem)33 static inline void up_write(pthread_rwlock_t *rwsem)
34 {
35 	if (pthread_rwlock_unlock(rwsem) != 0)
36 		die("unexpected pthread_rwlock_unlock() failure!");
37 }
38 
39 #endif /* KVM__RWSEM_H */
40