PTHREAD_RWLOCKATTR_DESTROY - Online Linux Manual PageSection : 3P
Updated : 2017
Source : IEEE/The Open Group
Note : POSIX Programmer's Manual
PROLOGThis manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAMEpthread_rwlockattr_destroy, pthread_rwlockattr_init — destroy and initialize the read-write lock attributes object
SYNOPSIS#include <pthread.h>
int pthread_rwlockattr_destroy(pthread_rwlockattr_t *attr);
int pthread_rwlockattr_init(pthread_rwlockattr_t *attr);
DESCRIPTIONThe 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. The behavior is undefined if the value specified by the attr argument to pthread_rwlockattr_destroy() does not refer to an initialized read-write lock attributes object.
RETURN VALUEIf successful, the pthread_rwlockattr_destroy() and pthread_rwlockattr_init() functions shall return zero; otherwise, an error number shall be returned to indicate the error.
ERRORSThe pthread_rwlockattr_init() function shall fail if: ENOMEM Insufficient memory exists to initialize the read-write lock attributes object. These functions shall not return an error code of [EINTR]. The following sections are informative.
EXAMPLESNone.
APPLICATION USAGENone.
RATIONALEIf an implementation detects that the value specified by the attr argument to pthread_rwlockattr_destroy() does not refer to an initialized read-write lock attributes object, it is recommended that the function should fail and report an [EINVAL] error.
FUTURE DIRECTIONSNone.
SEE ALSOpthread_rwlock_destroy(), pthread_rwlockattr_getpshared() The Base Definitions volume of POSIX.1‐2017, <pthread.h>
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html . Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . 0
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