1 .\" Copyright (c) 1998 Alex Nash
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25 .\" $FreeBSD: src/lib/libc_r/man/pthread_rwlock_unlock.3,v 1.2.2.2 2001/12/17 10:08:26 ru Exp $
26 .\" $DragonFly: src/lib/libc_r/man/pthread_rwlock_unlock.3,v 1.3 2006/02/17 19:35:07 swildner Exp $
29 .Dt PTHREAD_RWLOCK_UNLOCK 3
32 .Nm pthread_rwlock_unlock
33 .Nd release a read/write lock
39 .Fn pthread_rwlock_unlock "pthread_rwlock_t *lock"
42 .Fn pthread_rwlock_unlock
43 function is used to release the read/write lock previously obtained by
44 .Fn pthread_rwlock_rdlock ,
45 .Fn pthread_rwlock_wrlock ,
46 .Fn pthread_rwlock_tryrdlock ,
48 .Fn pthread_rwlock_trywrlock .
51 .Fn pthread_rwlock_unlock
52 function will return zero. Otherwise an error number will be returned
53 to indicate the error.
55 The results are undefined if
57 is not held by the calling thread.
60 .Fn pthread_rwlock_unlock
64 The value specified by
68 The current thread does not own the read/write lock.
71 .Xr pthread_rwlock_rdlock 3 ,
72 .Xr pthread_rwlock_wrlock 3
75 .Fn pthread_rwlock_unlock
76 function is expected to conform to
80 .Fn pthread_rwlock_unlock
81 function first appeared in