posix_spawnattr_setschedparam()

Updated: May 06, 2022

Set the scheduling parameters attribute of a spawn attributes object

Synopsis:

#include <spawn.h>

int posix_spawnattr_setschedparam(
       posix_spawnattr_t *_Restrict attrp,
       const struct sched_param *_Restrict sched_p);

Arguments:

attrp
A pointer to the spawn attributes object that you want to modify.
sched_p
A pointer to a sched_param structure that holds the scheduling parameters that you want to use.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The posix_spawnattr_setschedparam() function sets the value of the scheduling parameters attribute in the attributes object pointed to by attrp. You must have already initialized the spawn attributes object by calling posix_spawnattr_init().

The scheduling parameters attribute governs the parameter assigned to a new process image in a spawn operation if POSIX_SPAWN_SETSCHEDULER or POSIX_SPAWN_SETSCHEDPARAM is set in the spawn flags attribute; to set this flag, call the POSIX function posix_spawnattr_setflags(), or the QNX Neutrino function posix_spawnattr_setxflags(). The default value of the process group attribute is zero. By default, the child process uses the same scheduling parameters as the parent.

Note: In order to create a thread whose priority is above the maximum permitted for unprivileged processes, your process must have the PROCMGR_AID_PRIORITY ability enabled. For more information, see procmgr_ability().

You can retrieve the value of this attribute by calling posix_spawnattr_getschedparam().

For more information about spawn attributes, see the entry for posix_spawn().

Returns:

EOK
Success.
EINVAL
An argument was invalid.

Examples:

See posix_spawn().

Classification:

POSIX 1003.1 SPN

Safety:  
Cancellation point No
Interrupt handler Yes
Signal handler Yes
Thread Yes