Originální popis anglicky:
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get and set the
process-shared attribute
Návod, kniha: POSIX Programmer's Manual
#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 );
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
attr.
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 error.
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.
None.
None.
None.
None.
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 Technology -- 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
.
