Change the priority of a process
#include <sched.h> int sched_setparam( pid_t pid, const struct sched_param *param );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The sched_setparam() function changes the priority of process pid to that of the sched_priority member in the sched_param structure pointed to by param. If pid is zero, the priority of the calling process is changed.
The sched_priority member in param must lie between the minimum and maximum values returned by sched_get_priority_max() and sched_get_priority_min().
By default, the process priority and scheduling policy are inherited from or explicitly set by the parent process. Once running, the child process may change its priority by using this function.
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | Yes |
Thread | Yes |
In a multithreaded program, sched_setparam() sets the scheduling parameters for thread 1 in the process pid, or for the calling thread if pid is 0.
errno, getprio(), pthread_getschedparam(), pthread_setschedparam(), pthread_setschedprio(), sched_getparam(), sched_get_priority_max(), sched_get_priority_min(), sched_getscheduler(), sched_param, sched_setscheduler(), sched_yield(), setprio()
“Thread scheduling” in the QNX Neutrino Microkernel chapter of the System Architecture guide
“Scheduling policies” in the Programming Overview chapter of the QNX Neutrino Programmer's Guide