PTHREAD_MUTEXATTR_GETPSHARELinux Programmer's MPTHREAD_MUTEXATTR_GETPSHARED(3)NAME
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get/set
process-shared mutex attribute
SYNOPSIS
#include <pthread.h>
int pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr,
int *pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
int pshared);
Compile and link with -pthread.
DESCRIPTION
These functions get and set the process-shared attribute in a mutex
attributes object. This attribute must be appropriately set to ensure
correct, efficient operation of a mutex created using this attributes
object.
The process-shared attribute can have one of the following values:
PTHREAD_PROCESS_PRIVATE
Mutexes created with this attributes object are to be shared
only among threads in the same process that initialized the
mutex. This is the default value for the process-shared mutex
attribute.
PTHREAD_PROCESS_SHARED
Mutexes created with this attributes object can be shared
between any threads that have access to the memory containing
the object, including threads in different processes.
pthread_mutexattr_getpshared() places the value of the process-shared
attribute of the mutex attributes object referred to by attr in the
location pointed to by pshared.
pthread_mutexattr_setpshared() sets the value of the process-shared
attribute of the mutex attributes object referred to by attr to the
value specified in pshared.
If attr does not refer to an initialized mutex attributes object, the
behavior is undefined.
RETURN VALUE
On success, these functions return 0. On error, they return a positive
error number.
ERRORSpthread_mutexattr_setpshared() can fail with the following errors:
EINVAL The value specified in pshared is invalid.
ENOTSUP
pshared is PTHREAD_PROCESS_SHARED but the implementation does
not support process-shared mutexes.
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
SEE ALSOpthread_mutexattr_init(3), pthreads(7)COLOPHON
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latest version of this page, can be found at
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Linux 2017-09-13 PTHREAD_MUTEXATTR_GETPSHARED(3)
