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pthread_getschedparam, pthread_setschedparam - access dynamic thread scheduling parameters

cc -mt [ flag... ] file... -lpthread [ library... ]
#include <pthread.h>

int pthread_getschedparam(pthread_t thread, int *restrict policy,
 struct sched_param *restrict param);

int pthread_setschedparam(pthread_t thread, int policy,
 const struct sched_param *param);

The pthread_getschedparam() and pthread_setschedparam() functions allow the scheduling policy and scheduling parameters of individual threads within a multithreaded process to be retrieved and set. Supported policies are :

SCHED_OTHER

SCHED_FIFO

SCHED_RR

SCHED_IA

SCHED_FSS

SCHED_FX

See pthreads(5). The affected scheduling parameter is the sched_priority member of the sched_param structure.

The pthread_getschedparam() function retrieves the scheduling policy and scheduling parameters for the thread whose thread ID is given by thread and stores those values in policy and param, respectively. The priority value returned from pthread_getschedparam() is the value specified by the most recent pthread_setschedparam() or pthread_create() call affecting the target thread, and does not reflect any temporary adjustments to its priority as a result of any priority inheritance or ceiling functions. The pthread_setschedparam() function sets the scheduling policy and associated scheduling parameters for the thread whose thread ID is given by thread to the policy and associated parameters provided in policy and param, respectively.

If the pthread_setschedparam() function fails, no scheduling parameters will be changed for the target thread.

If successful, the pthread_getschedparam() and pthread_setschedparam() functions return 0. Otherwise, an error number is returned to indicate the error.

The pthread_getschedparam() and pthread_gsetschedparam() functions will fail if:

ESRCH

The pthread_setschedparam() function will fail if:

EINVAL

EPERM

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Committed
MT-Level	MT-Safe
Standard	See standards(5).

pthread_attr_init(3C), sched_getparam(3C), sched_get_priority_max(3C)sched_get_priority_max(3C), sched_get_priority_min(3C), sched_setparam(3C), sched_getscheduler(3C), sched_setscheduler(3C), attributes(5), pthreads(5), standards(5)