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Set the priority of a process
#include <sched.h>
int setprio( pid_t pid,
int prio );
- pid
- The process ID of the process whose priority you want to set.
- prio
- The new priority.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The setprio() function changes the priority of thread 1 of process
pid to priority prio. If pid is zero, the
priority of the calling thread is set.
The previous priority, or -1 if an error occurred (errno is set).
- EINVAL
- The priority prio isn't a valid priority.
- EPERM
- The calling process doesn't have sufficient privilege to set the priority.
- ESRCH
- The process pid doesn't exist.
QNX 4
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
The getprio() and setprio() functions are included in
the QNX Neutrino libraries
for porting QNX 4 applications.
For new programs, use
sched_setparam()
or
pthread_setschedparam().
errno,
getprio(),
pthread_getschedparam(),
pthread_setschedparam(),
sched_getparam(),
sched_get_priority_max(),
sched_get_priority_min(),
sched_getscheduler(),
sched_setscheduler(),
sched_yield()
“Thread scheduling”
in the QNX Neutrino Microkernel chapter of the
System Architecture guide
“Scheduling algorithms”
in the Programming Overview chapter of the
QNX Neutrino Programmer's Guide
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