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$FreeBSD: head/share/man/man3/pthread_rwlock_init.3 84306 2001-10-01 16:09:29Z ru $
.Dd August 4, 1998 .Dt PTHREAD_RWLOCK_INIT 3 .Os .Sh NAME .Nm pthread_rwlock_init .Nd initialize a read/write lock .Sh LIBRARY .Lb libc_r .Sh SYNOPSIS n pthread.h .Ft int .Fn pthread_rwlock_init "pthread_rwlock_t *lock" "const pthread_rwlockattr_t *attr" .Sh DESCRIPTION The .Fn pthread_rwlock_init function is used to initialize a read/write lock, with attributes specified by .Fa attr . If .Fa attr is NULL, the default read/write lock attributes are used.
p The results of calling .Fn pthread_rwlock_init with an already initialized lock are undefined. .Sh RETURN VALUES If successful, the .Fn pthread_rwlock_init function will return zero. Otherwise an error number will be returned to indicate the error. .Sh SEE ALSO .Xr pthread_rwlockattr_init 3 , .Xr pthread_rwlockattr_setpshared 3 , .Xr pthread_rwlock_destroy 3 .Sh STANDARDS The .Fn pthread_rwlock_init function is expected to conform to .St -susv2 . .Sh ERRORS The .Fn pthread_rwlock_init function will fail if: l -tag -width Er t Bq Er EAGAIN The system lacked the necessary resources (other than memory) to initialize the lock. t Bq Er ENOMEM Insufficient memory exists to initialize the lock. t Bq Er EPERM The caller does not have sufficient privilege to perform the operation. .El
p The .Fn pthread_rwlock_init function may fail if: l -tag -width Er t Bq Er EBUSY The system has detected an attempt to re-initialize the object referenced by .Fa lock , a previously initialized but not yet destroyed read/write lock. t Bq Er EINVAL The value specified by .Fa attr is invalid. .El .Sh HISTORY The .Fn pthread_rwlock_init function first appeared in .Fx 3.0 . .Sh BUGS The PTHREAD_PROCESS_SHARED attribute is not supported.