pthread_rwlock_init -- initialize a read/write lock
Reentrant C Library (libc_r, -lc_r)
const pthread_rwlockattr_t *attr);
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.
If successful, the pthread_rwlock_init() function will return zero. Otherwise
an error number will be returned to indicate the error.
The pthread_rwlock_init() function is expected to conform to Version 2 of
the Single UNIX Specification (``SUSv2'').
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 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.
The pthread_rwlock_init() function first appeared in FreeBSD 3.0.
The PTHREAD_PROCESS_SHARED attribute is not supported.
FreeBSD 5.2.1 August 4, 1998 FreeBSD 5.2.1 [ Back ]