получить / установить атрибут мьютекса, общий для процесса (get/set process-shared mutex attribute)
Имя (Name)
pthread_mutexattr_getpshared, pthread_mutexattr_setpshared -
get/set process-shared mutex attribute
Синопсис (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);
Compile and link with -pthread.
Описание (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.
Возвращаемое значение (Return value)
On success, these functions return 0. On error, they return a
positive error number.
Ошибки (Error)
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.
Стандарты (Conforming to)
POSIX.1-2001, POSIX.1-2008.
Смотри также (See also)
pthread_mutexattr_init(3), pthreads(7)
