PTHREAD_RWLOCK_INIT(3)  NetBSD Library Functions Manual PTHREAD_RWLOCK_INIT(3)

NAME
     pthread_rwlock_init -- initialize a read/write lock

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_rwlock_init(pthread_rwlock_t * restrict lock,
         const pthread_rwlockattr_t * restrict 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.  Oth-
     erwise an error number will be returned to indicate the error.

ERRORS
     The pthread_rwlock_init() function shall fail if:

     [EAGAIN]           The system lacks the resources to initialize another
                        read-write lock.

     [ENOMEM]           Insufficient memory exists to initialize the read-
                        write lock.

     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 initial-
                        ized but not yet destroyed read/write lock.

     [EINVAL]           The value specified by attr is invalid.

SEE ALSO
     pthread_rwlock_destroy(3), pthread_rwlock_rdlock(3),
     pthread_rwlock_unlock(3), pthread_rwlock_wrlock(3)

STANDARDS
     pthread_rwlock_init() conforms to ISO/IEC 9945-1:1996 (``POSIX.1'').

BUGS
     The PTHREAD_PROCESS_SHARED attribute is not supported.

NetBSD 5.0_STABLE              January 30, 2003              NetBSD 5.0_STABLE
