January 30, 2003 PTHREAD_SCHEDPARAM 3

### NAME

pthread_setschedparam, pthread_getschedparam - thread scheduling parameter manipulation

### LIBRARY

POSIX Thread Library (libpthread, -lpthread)

### SYNOPSIS

```int` pthread_setschedparam(```pthread_t thread``, int policy``, const struct sched_param *param`)
```int` pthread_getschedparam(```pthread_t thread``, int * restrict policy``, struct sched_param * restrict param`)

### DESCRIPTION

The pthread_setschedparam(``) and pthread_getschedparam(``) functions set and get the scheduling parameters of individual threads. The scheduling policy for a thread can either be ```SCHED_FIFO` (first in, first out), ```SCHED_RR` (round-robin), or ```SCHED_OTHER` (system default). The thread priority (accessed via param->sched_priority) must be at least ```PTHREAD_MIN_PRIORITY` and no more than ```PTHREAD_MAX_PRIORITY`.

### RETURN VALUES

If successful, these functions return 0. Otherwise, an error number is returned to indicate the error.

### ERRORS

pthread_setschedparam(``) may fail if:

[```EINVAL`]
  The value specified by policy is invalid.

[```ENOTSUP`]
  Invalid value for scheduling parameters.

[```ESRCH`]
  Non-existent thread thread.

pthread_getschedparam(``) may fail if:

[```ESRCH`]
  Non-existent thread thread.

### STANDARDS

pthread_setschedparam(``) and pthread_getschedparam(``) conform to ISO/IEC 9945-1:1996 (``POSIX.1'') .