pthread_rwlock_init man page on OpenBSD

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PTHREAD_RWLOCK_INIT(3)	  OpenBSD Programmer's Manual	PTHREAD_RWLOCK_INIT(3)

NAME
     pthread_rwlock_init - initialize a read/write lock

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlock_init(pthread_rwlock_t *lock, const pthread_rwlockattr_t
     *attr);

DESCRIPTION
     The pthread_rwlock_init() function is used to initialize a read/write
     lock, with attributes specified by attr.  If attr is NULL, the default
     read/write lock attributes are used.

     The results of calling pthread_rwlock_init() with an already initialized
     lock are undefined.

RETURN VALUES
     If successful, the pthread_rwlock_init() function will return zero.
     Otherwise an error number will be returned to indicate the error.

ERRORS
     The pthread_rwlock_init() function will fail if:

     [EAGAIN]	   The system lacked the necessary resources (other than
		   memory) to initialize the lock.

     [ENOMEM]	   Insufficient memory exists to initialize the lock.

     [EPERM]	   The caller does not have sufficient privilege to perform
		   the operation.

     The pthread_rwlock_init() function may fail if:

     [EBUSY]	   The system has detected an attempt to re-initialize the
		   object referenced by lock, a previously initialized but not
		   yet destroyed read/write lock.

     [EINVAL]	   The value specified by attr is invalid.

SEE ALSO
     pthread_rwlock_destroy(3), pthread_rwlockattr_init(3),
     pthread_rwlockattr_setpshared(3)

STANDARDS
     The pthread_rwlock_init() function is expected to conform to Version 2 of
     the Single UNIX Specification.

HISTORY
     The pthread_rwlock_init() function first appeared in FreeBSD 3.0 and
     OpenBSD 2.5.

BUGS
     The PTHREAD_PROCESS_SHARED attribute is not supported.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9
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