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PTHREAD_RWLOCKATTR(3) Library Functions Manual PTHREAD_RWLOCKATTR(3)

pthread_rwlockattr_init, pthread_rwlockattr_destroy, pthread_rwlockattr_getpshared, pthread_rwlockattr_setpshared — initialize, destroy or query read/write lock attributes

library “libpthread”

#include <pthread.h>

int
pthread_rwlockattr_init(pthread_rwlockattr_t *attr);

int
pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);

int
pthread_rwlockattr_getpshared(const pthread_rwlockattr_t *__restrict attr, int * __restrict pshared);

int
pthread_rwlockattr_setpshared(pthread_rwlockattr_t *attr, int pshared);

The () function is used to initialize a read/write lock attributes object.

The () function is used to destroy a read/write lock attribute object previously created with pthread_rwlockattr_init().

The () function shall obtain the value of process-shared attribute from the initialized attributes object referenced by attr.

The () function shall set the process-shared attribute in an initialized attributes object referenced by attr.

If successful, all these functions return zero. Otherwise an error number will be returned to indicate the error.

pthread_rwlockattr_init() shall fail if:

[]
Insufficient memory exists to initialize the read/write lock attributes object.

pthread_rwlockattr_init() and pthread_rwlockattr_destroy() may fail if:

[]
The value specified by attr is invalid.

pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() may fail if:

[]
The value specified by attr is invalid.

pthread_rwlock_init(3)

Both functions conform to IEEE Std 1003.1-2001 (“POSIX.1”).

The pthread_rwlockattr_getpshared() and pthread_rwlockattr_setpshared() functions are hidden by default since only thread shared attributes are supported.

June 12, 2016 NetBSD-9.2