AIX Version 4.3 Base Operating System and Extensions Technical Reference, Volume

pthread_attr_setschedparam Subroutine


Sets the value of the schedparam attribute of a thread attributes object.


Threads Library (libpthreads.a)




int pthread_attr_setschedparam (attr, schedparam)

pthread_attr_t *attr;

const struct sched_param *schedparam;


The pthread_attr_setschedparam subroutine sets the value of the schedparam
attribute of the thread attributes object attr. The schedparam attribute
specifies the scheduling parameters of a thread created with this attributes
object. The sched_priority field of the sched_param structure contains the
priority of the thread.

    Note: The pthread.h header file must be the first included file of each
    source file using the threads library. Otherwise, the -D_THREAD_SAFE
    compilation flag should be used, or the cc_r compiler used. In this case, the
    flag is automatically set.


attr Specifies the thread attributes object.

schedparam Points to where the scheduling parameters to set are stored. The
sched_priority field must be in the range from 1 to 127, where 1 is the least
favored priority, and 127 the most favored.

Return Values

Upon successful completion, 0 is returned. Otherwise, an error code is returned.

Error Codes

The pthread_attr_setschedparam subroutine is unsuccessful if the following is

EINVAL The attr parameter is not valid.

ENOSYS The priority scheduling POSIX option is not implemented.

ENOTSUP The value of the schedparam attribute is not supported.

Implementation Specifics

This subroutine is part of the Base Operating System (BOS) Runtime.

Related Information

The pthread_attr_getschedparam subroutine, pthread_attr_init subroutine,
pthread_create subroutine, the pthread.h file.

Threads Scheduling in AIX Version 4.3 General Programming Concepts: Writing and
Debugging Programs.

Threads Library Options and Threads Library Quick Reference in AIX Version 4.3
General Programming Concepts: Writing and Debugging Programs.