PDF 文書ファイルをダウンロードする (3779 KB)

pthread_attr_setschedpolicy(3C)

Name | Synopsis | Description | Return Values | Errors | Usage | Attributes | See Also

Name

pthread_attr_getschedpolicy, pthread_attr_setschedpolicy– get or set schedpolicy attribute

Synopsis

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

int pthread_attr_getschedpolicy(const pthread_attr_t *restrict attr,
     int *restrict policy);

int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy);

Description

The functions pthread_attr_setschedpolicy() and pthread_attr_getschedpolicy(), respectively, set and get the schedpolicy attribute in the attr argument.

The supported values of policy include SCHED_FIFO, SCHED_RR and SCHED_OTHER, which are defined by the header <sched.h>. When threads executing with the scheduling policy SCHED_FIFO or SCHED_RR are waiting on a mutex, they acquire the mutex in priority order when the mutex is unlocked.

Return Values

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

Errors

The pthread_attr_setschedpolicy() or pthread_attr_getschedpolicy() function may fail if:

EINVAL

attr or policy is invalid.

Usage

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.

Attributes

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

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard
MT-Level	MT-Safe

See Also

pthread_attr_init(3C), pthread_attr_setscope(3C), pthread_attr_setinheritsched(3C), pthread_attr_setschedparam(3C), pthread_create(3C), pthread_setschedparam(3C), attributes(5), standards(5)

Name | Synopsis | Description | Return Values | Errors | Usage | Attributes | See Also