sched_getscheduler()
QNX SDP8.0C Library ReferenceAPIDeveloper
Get the current scheduling policy for a process
Synopsis:
#include <sched.h>
int sched_getscheduler( pid_t pid );
Arguments:
- pid
- The ID of the process whose scheduling policy you want to find, or zero if you want to get the policy for the current process.
Library:
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
Description:
The sched_getscheduler() function gets the current scheduling policy of process pid. If pid is zero, the scheduling policy of the calling process is returned.
Note:
- In QNX OS, scheduling is associated with threads, not processes, so sched_getscheduler() gets the scheduling policy for thread 1 in the process pid, or for the calling thread if pid is 0.
- In order to get the scheduling policy for a process whose user ID is different from the calling process's real or effective user ID, your process must have the PROCMGR_AID_SCHEDULE ability enabled. For more information, see procmgr_ability().
Returns:
The scheduling policy, or -1 if an error occurred (errno is set).
Errors:
- EPERM
- The calling process doesn't have sufficient privilege to get the scheduling policy; see procmgr_ability().
- ESRCH
- The process pid doesn't exist.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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