pthread_mutexattr_getpshared
Section: C Library Functions (3)
Updated: 2022-10-30
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NAME
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get/set
process-shared mutex attribute
LIBRARY
POSIX threads library
(libpthread, -lpthread)
SYNOPSIS
#include <pthread.h>
int pthread_mutexattr_getpshared(
const pthread_mutexattr_t *restrict attr,
int *restrict pshared);
int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr,
int pshared);
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.
ERRORS
pthread_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.
STANDARDS
POSIX.1-2001, POSIX.1-2008.
SEE ALSO
pthread_mutexattr_init(3),
pthreads(7)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- STANDARDS
-
- SEE ALSO
-
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