PTHREAD_BARRIERATTR_GETPSHARED(3) Library Functions Manual PTHREAD_BARRIERATTR_GETPSHARED(3)

pthread_barrierattr_getpshared pthread_barrierattr_setpshared — get and set the process-shared attribute of the barrier attributes object (ADVANCED REALTIME THREADS)


#include <pthread.h>

[BAR TSH] int pthread_barrierattr_getpshared(const pthread_barrierattr_t *
       restrict attr, int *restrict pshared);
int pthread_barrierattr_setpshared(pthread_barrierattr_t *attr,
       int pshared);

The pthread_barrierattr_getpshared () function shall obtain the value of the process-shared attribute from the attributes object referenced by attr. The pthread_barrierattr_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 barrier to be operated upon by any thread that has access to the memory where the barrier is allocated. If the process-shared attribute is PTHREAD_PROCESS_PRIVATE, the barrier shall only be operated upon by threads created within the same process as the thread that initialized the barrier; if threads of different processes attempt to operate on such a barrier, the behavior is undefined. The default value of the attribute shall be PTHREAD_PROCESS_PRIVATE. Both constants PTHREAD_PROCESS_SHARED and PTHREAD_PROCESS_PRIVATE are defined in <pthread.h>.

Additional attributes, their default values, and the names of the associated functions to get and set those attribute values are implementation-defined.

If successful, the pthread_barrierattr_getpshared () function shall return zero and store the value of the process-shared attribute of attr into the object referenced by the parameter. Otherwise, an error number shall be returned to indicate the error.

If successful, the pthread_barrierattr_setpshared () function shall return zero; otherwise, an error number shall be returned to indicate the error.

These functions may fail if:

The value specified by attr is invalid.

The pthread_barrierattr_setpshared () function may fail if:

The new value specified for the process-shared attribute is not one of the legal values PTHREAD_PROCESS_SHARED or PTHREAD_PROCESS_PRIVATE.

These functions shall not return an error code of [EINTR].

None.

The pthread_barrierattr_getpshared () and pthread_barrierattr_setpshared () functions are part of the Barriers option and need not be provided on all implementations.

None.

None.

pthread_barrier_destroy(3) , pthread_barrierattr_destroy(3) , pthread_barrierattr_init(3) , the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <pthread.h>

First released in Issue 6. Derived from IEEE Std 1003.1j-2000

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December 6, 2001 posix.fail