PTHREAD_RWLOCKATTR_INIT(3) Library Functions Manual PTHREAD_RWLOCKATTR_INIT(3)

pthread_rwlockattr_destroy pthread_rwlockattr_init — destroy and initialize the read-write lock attributes object


#include <pthread.h>

int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);

The pthread_rwlockattr_destroy () function shall destroy a read-write lock attributes object. A destroyed attr attributes object can be reinitialized using pthread_rwlockattr_init (); the results of otherwise referencing the object after it has been destroyed are undefined. An implementation may cause pthread_rwlockattr_destroy () to set the object referenced by attr to an invalid value.

The pthread_rwlockattr_init () function shall initialize 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 attr 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) shall not affect any previously initialized read-write locks.

If successful, the pthread_rwlockattr_destroy () and pthread_rwlockattr_init () functions shall return zero; otherwise, an error number shall be returned to indicate the error.

The pthread_rwlockattr_destroy () function may fail if:

The value specified by attr is invalid.

The pthread_rwlockattr_init () function shall fail if:

Insufficient memory exists to initialize the read-write lock attributes object.

These functions shall not return an error code of [EINTR].

None.

None.

None.

None.

pthread_rwlock_destroy(3), pthread_rwlockattr_getpshared(3), pthread_rwlockattr_setpshared(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <pthread.h>

First released in Issue 5.

The following changes are made for alignment with IEEE Std 1003.1j-2000:

  • The margin code in the SYNOPSIS is changed to THR to indicate that the functionality is now part of the Threads option (previously it was part of the Read-Write Locks option in IEEE Std 1003.1j-2000 and also part of the XSI extension).
  • The SEE ALSO section is updated.

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December 6, 2001 posix.fail