The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2003 Edition
Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.

NAME

pthread_attr_getschedpolicy, pthread_attr_setschedpolicy - get and set the schedpolicy attribute (REALTIME THREADS)

SYNOPSIS

[THR TPS] [Option Start] #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); [Option End]

DESCRIPTION

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

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

RETURN VALUE

If successful, the pthread_attr_getschedpolicy() and pthread_attr_setschedpolicy() functions shall return zero; otherwise, an error number shall be returned to indicate the error.

ERRORS

The pthread_attr_setschedpolicy() function may fail if:

[EINVAL]
The value of policy is not valid.
[ENOTSUP]
An attempt was made to set the attribute to an unsupported value.

These functions shall not return an error code of [EINTR].


The following sections are informative.

EXAMPLES

None.

APPLICATION 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.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

pthread_attr_destroy() , pthread_attr_getscope() , pthread_attr_getinheritsched() , pthread_attr_getschedparam() , pthread_create() , the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>, <sched.h>

CHANGE HISTORY

First released in Issue 5. Included for alignment with the POSIX Threads Extension.

Marked as part of the Realtime Threads Feature Group.

Issue 6

The pthread_attr_getschedpolicy() and pthread_attr_setschedpolicy() functions are marked as part of the Threads and Thread Execution Scheduling options.

The [ENOSYS] error condition has been removed as stubs need not be provided if an implementation does not support the Thread Execution Scheduling option.

The SCHED_SPORADIC scheduling policy is added for alignment with IEEE Std 1003.1d-1999.

The restrict keyword is added to the pthread_attr_getschedpolicy() prototype for alignment with the ISO/IEC 9899:1999 standard.

End of informative text.


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