DragonFly On-Line Manual Pages
PTHREAD_RWLOCK_INI... DragonFly Library Functions Manual PTHREAD_RWLOCK_INI...
pthread_rwlock_init -- initialize a read/write lock
POSIX Threads Library (libpthread, -lpthread)
pthread_rwlock_init(pthread_rwlock_t * restrict lock,
const pthread_rwlockattr_t * restrict 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 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.
The pthread_rwlock_init() function is expected to conform to Version 2 of
the Single UNIX Specification (``SUSv2'').
The pthread_rwlock_init() function first appeared in FreeBSD 3.0.
The PTHREAD_PROCESS_SHARED attribute is not supported.
DragonFly 5.1 February 22, 2018 DragonFly 5.1