pthread_mutexattr_getpshared, pthread_mutexattr_setpshared - get/set process-shared mutex attribute
#include <pthread.h> int pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr, int *pshared); int pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, int pshared);
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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:
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.
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
attr in the location pointed to by
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.
attr does not refer to an initialized mutex attributes
object, the behavior is undefined.
On success, these functions return 0. On error, they return a positive error number.
pthread_mutexattr_setpshared() can fail with the following errors:
The value specified in
pshared is invalid.
pshared is PTHREAD_PROCESS_SHARED but the
implementation does not support process-shared mutexes.
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