PTHREAD_RWLOCKATTR_INIT(3C)PTHREAD_RWLOCKATTR_INIT(3C)NAME
pthread_rwlockattr_init, pthread_rwlockattr_destroy - initialize or
destroy read-write lock attributes object
SYNOPSIS
cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
DESCRIPTION
The pthread_rwlockattr_init() function initializes a read-write lock
attributes object attr with the default value for all of the attributes
defined by the implementation.
Results are undefined if pthread_rwlockattr_init() is called specifying
an already initialized read-write lock attributes object.
After a read-write lock attributes object has been used to initialize
one or more read-write locks, any function affecting the attributes
object (including destruction) does not affect any previously initial‐
ized read-write locks.
The pthread_rwlockattr_destroy() function destroys a read-write lock
attributes object. The effect of subsequent use of the object is unde‐
fined until the object is re-initialized by another call to
pthread_rwlockattr_init(). An implementation can cause pthread_rwlock‐
attr_destroy() to set the object referenced by attr to an invalid
value.
RETURN VALUES
If successful, the pthread_rwlockattr_init() and pthread_rwlock‐
attr_destroy() functions return 0. Otherwise, an error number is
returned to indicate the error.
ERRORS
The pthread_rwlockattr_init() function will fail if:
ENOMEM
Insufficient memory exists to initialize the read-write lock
attributes object.
The pthread_rwlockattr_destroy() function may fail if:
EINVAL
The value specified by attr is invalid.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌────────────────────┬─────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├────────────────────┼─────────────────┤
│Interface Stability │ Standard │
├────────────────────┼─────────────────┤
│MT-Level │ MT-Safe │
└────────────────────┴─────────────────┘
SEE ALSOpthread_rwlock_init(3C), pthread_rwlock_rdlock(3C),
pthread_rwlock_unlock(3C), pthread_rwlock_wrlock(3C), pthread_rwlock‐
attr_getpshared(3C), attributes(5), standards(5)
Mar 23, 2005 PTHREAD_RWLOCKATTR_INIT(3C)
