posix_spawnattr_getschedpolicy (3p) - Linux Manuals

posix_spawnattr_getschedpolicy: get

PROLOG

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.

NAME

posix_spawnattr_getschedpolicy, posix_spawnattr_setschedpolicy - get and set the spawn-schedpolicy attribute of a spawn attributes object (ADVANCED REALTIME)

SYNOPSIS

#include <spawn.h>
#include <sched.h>

int posix_spawnattr_getschedpolicy(const posix_spawnattr_t *
       restrict attr, int *restrict schedpolicy);
int posix_spawnattr_setschedpolicy(posix_spawnattr_t *attr,
       int schedpolicy);

DESCRIPTION

The posix_spawnattr_getschedpolicy() function shall obtain the value of the spawn-schedpolicy attribute from the attributes object referenced by attr.

The posix_spawnattr_setschedpolicy() function shall set the spawn-schedpolicy attribute in an initialized attributes object referenced by attr.

The spawn-schedpolicy attribute represents the scheduling policy to be assigned to the new process image in a spawn operation (if POSIX_SPAWN_SETSCHEDULER is set in the spawn-flags attribute). The default value of this attribute is unspecified.

RETURN VALUE

Upon successful completion, posix_spawnattr_getschedpolicy() shall return zero and store the value of the spawn-schedpolicy attribute of attr into the object referenced by the schedpolicy parameter; otherwise, an error number shall be returned to indicate the error.

Upon successful completion, posix_spawnattr_setschedpolicy() shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

These functions may fail if:

EINVAL

The value specified by attr is invalid.

The posix_spawnattr_setschedpolicy() function may fail if:

EINVAL

The value of the attribute being set is not valid.

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

These functions are part of the Spawn and Process Scheduling options and need not be provided on all implementations.

RATIONALE

None.

FUTURE DIRECTIONS

None.

COPYRIGHT

Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 .