pthread_rwlock_init - initialize a read/write lock
const pthread_rwlockattr_t *attr);
The pthread_rwlock_init() function is used to initialize a
lock, with attributes specified by attr. If attr is NULL,
read/write lock attributes are used.
The results of calling pthread_rwlock_init() with an already
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 will fail if:
[EAGAIN] The system lacked the necessary resources
(other than memory)
to initialize the lock.
[ENOMEM] Insufficient memory exists to initialize the
[EPERM] The caller does not have sufficient privilege
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 is expected to conform to
Version 2 of
the Single UNIX Specification.
The pthread_rwlock_init() function first appeared in FreeBSD
The PTHREAD_PROCESS_SHARED attribute is not supported.
OpenBSD 3.6 August 4, 1998
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