The functions pthread_attr_setschedparam() and pthread_attr_getschedparam(), respectively, set and get the scheduling parameter attributes in the attr argument. The contents of the param structure are defined in <sched.h>. For the SCHED_FIFO and SCHED_RR policies, the only required member of param is sched_priority.

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

The pthread_attr_setschedparam() function may fail if:

EINVAL

attr is invalid.

The pthread_attr_getschedparam() function may fail if:

EINVAL

attr or param is invalid.

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.

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

pthread_attr_init(3THR), pthread_attr_setscope(3THR), pthread_attr_setinheritsched(3THR), pthread_attr_setschedpolicy(3THR), pthread_create(3THR), pthread_setschedparam(3THR), attributes(5), standards(5)