PTHREAD_MUTEXATTR_GETPSHARED(P) POSIX Programmer's Manual PTHREAD_MUTEXATTR_GETPSHARED(P)
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get and set the process-shared attribute
int pthread_mutexattr_getpshared(const pthread_mutexattr_t *
restrict attr, int *restrict pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
The pthread_mutexattr_getpshared() function shall obtain the value of the process-shared attribute from the attributes object referenced by
attr. The pthread_mutexattr_setpshared() function shall set the process-shared attribute in an initialized attributes object referenced by
The process-shared attribute is set to PTHREAD_PROCESS_SHARED to permit a mutex to be operated upon by any thread that has access to the
memory where the mutex is allocated, even if the mutex is allocated in memory that is shared by multiple processes. If the process-shared
attribute is PTHREAD_PROCESS_PRIVATE, the mutex shall only be operated upon by threads created within the same process as the thread that
initialized the mutex; if threads of differing processes attempt to operate on such a mutex, the behavior is undefined. The default value
of the attribute shall be PTHREAD_PROCESS_PRIVATE.
Upon successful completion, pthread_mutexattr_setpshared() shall return zero; otherwise, an error number shall be returned to indicate the
Upon successful completion, pthread_mutexattr_getpshared() shall return zero and store the value of the process-shared attribute of attr
into the object referenced by the pshared parameter. Otherwise, an error number shall be returned to indicate the error.
The pthread_mutexattr_getpshared() and pthread_mutexattr_setpshared() functions may fail if:
EINVAL The value specified by attr is invalid.
The pthread_mutexattr_setpshared() function may fail if:
EINVAL The new value specified for the attribute is outside the range of legal values for that attribute.
These functions shall not return an error code of [EINTR].
The following sections are informative.
pthread_cond_destroy() , pthread_create() , pthread_mutex_destroy() , pthread_mutexattr_destroy() , the Base Definitions volume of
IEEE Std 1003.1-2001, <pthread.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .
IEEE/The Open Group 2003 PTHREAD_MUTEXATTR_GETPSHARED(P)