PTHREAD_ATTR_GETSCOPE(3) Library Functions Manual PTHREAD_ATTR_GETSCOPE(3)

pthread_attr_getscope pthread_attr_setscope — get and set the contentionscope attribute (REALTIME THREADS)


#include <pthread.h>

int pthread_attr_getscope(const pthread_attr_t *restrict attr,
       int *restrict contentionscope);
int pthread_attr_setscope(pthread_attr_t *attr, int contentionscope);

The pthread_attr_getscope () and pthread_attr_setscope () functions, respectively, shall get and set the contentionscope attribute in the object.

The contentionscope attribute may have the values PTHREAD_SCOPE_SYSTEM, signifying system scheduling contention scope, or PTHREAD_SCOPE_PROCESS, signifying process scheduling contention scope. The symbols PTHREAD_SCOPE_SYSTEM and PTHREAD_SCOPE_PROCESS are defined in the <pthread.h> header.

If successful, the pthread_attr_getscope () and pthread_attr_setscope () functions shall return zero; otherwise, an error number shall be returned to indicate the error.

The pthread_attr_setscope () function may fail if:

The value of contentionscope is not valid.
An attempt was made to set the attribute to an unsupported value.

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

None.

After these attributes have been set, a thread can be created with the specified attributes using pthread_create(3). Using these routines does not affect the current running thread.

None.

None.

pthread_attr_destroy(3) , pthread_attr_getinheritsched(3) , pthread_attr_getschedpolicy(3) , pthread_attr_getschedparam(3) , pthread_create(3) , the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), <pthread.h>, <sched.h>

First released in Issue 5. Included for alignment with the POSIX Threads Extension.

Marked as part of the Realtime Threads Feature Group.

The pthread_attr_getscope () and pthread_attr_setscope () functions are marked as part of the Threads and Thread Execution Scheduling options.

The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Thread Execution Scheduling option.

The keyword is added to the pthread_attr_getscope () prototype for alignment with the ISO/IEC 9899:1999 (“ISO C99”) standard.

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December 6, 2001 posix.fail