NAME

posix_spawnattr_getschedparam, posix_spawnattr_setschedparam — get and set the spawn-schedparam attribute of a spawn attributes object (ADVANCED REALTIME)

SYNOPSIS

[SPN PS] #include <spawn.h>
#include <sched.h>

int posix_spawnattr_getschedparam(const posix_spawnattr_t
       *restrict attr, struct sched_param *restrict schedparam);
int posix_spawnattr_setschedparam(posix_spawnattr_t *restrict attr,
       const struct sched_param *restrict schedparam);

DESCRIPTION

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

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

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

RETURN VALUE

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

Upon successful completion, posix_spawnattr_setschedparam() 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_setschedparam() function may fail if:

[EINVAL]

The value of the attribute being set is not valid.

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.

SEE ALSO

posix_spawn, posix_spawnattr_destroy, posix_spawnattr_getsigdefault, posix_spawnattr_getflags, posix_spawnattr_getpgroup, posix_spawnattr_getschedpolicy, posix_spawnattr_getsigmask

XBD <sched.h>, <spawn.h>

CHANGE HISTORY

First released in Issue 6. Derived from IEEE Std 1003.1d-1999.