pthread_attr_setschedpolicy, pthread_attr_getschedpolicy - set and get schedpolicy attribute (REALTIME THREADS)
#include <pthread.h> int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy); int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy);
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.
If successful, the pthread_attr_setschedpolicy() and pthread_attr_getschedpolicy() functions return zero. Otherwise, an error number is returned to indicate the error.
The pthread_attr_setschedpolicy() and pthread_attr_getschedpolicy() functions will fail if:
- The option _POSIX_THREAD_PRIORITY_SCHEDULING is not defined and the implementation does not support the function.
The pthread_attr_setschedpolicy() function may fail if:
- The value of the attribute being set is not valid.
- An attempt was made to set the attribute to an unsupported value.
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.
pthread_attr_init(), pthread_attr_setscope(), pthread_attr_setinheritsched(), pthread_attr_setschedparam(), pthread_create(), <pthread.h>, pthread_setschedparam(), <sched.h>.
Derived from the POSIX Threads Extension (1003.1c-1995)