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Change the priority of a process
#include <sched.h>
int sched_setparam(
pid_t pid,
const struct sched_param *param );
- pid
- The ID of the process whose priority you want to set, or 0 to set it
for the current process.
- param
- A pointer to a
sched_param
structure whose
sched_priority member holds the priority that you want to
assign to the process.
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 algorithm are inherited
from or explicitly set by the parent process.
Once running, the child process may change its priority by using this
function.
- 0
- Success
- -1
- An error occurred (errno is set).
- EFAULT
- A fault occurred trying to access the buffers provided.
- EINVAL
- The priority 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.
POSIX 1003.1 PS
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(),
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 algorithms”
in the Programming Overview chapter of the
QNX Neutrino Programmer's Guide
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