Manpages - pthread_attr_getscope.3p

This manual page is part of the POSIX Programmer’s Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

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 attr 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.

The behavior is undefined if the value specified by the attr argument to /pthread_attr_getscope/() or /pthread_attr_setscope/() does not refer to an initialized thread attributes object.

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 shall fail if:

ENOTSUP

An attempt was made to set the attribute to an unsupported value.

The /pthread_attr_setscope/() function may fail if:

EINVAL

The value of contentionscope is not valid.

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

The following sections are informative.

None.

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

See Section 2.9.4, Thread Scheduling for further details on thread scheduling attributes and their default settings.

If an implementation detects that the value specified by the attr argument to /pthread_attr_getscope/() or /pthread_attr_setscope/() does not refer to an initialized thread attributes object, it is recommended that the function should fail and report an [EINVAL] error.

None.

/pthread_attr_destroy ( )/, /pthread_attr_getinheritsched ( )/, /pthread_attr_getschedpolicy ( )/, /pthread_attr_getschedparam ( )/, /pthread_create ( )/

The Base Definitions volume of POSIX.1‐2017, <pthread.h>, <sched.h>

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology – Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

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