Sched
https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/sched.h.html
Part of QRT Real-Time Kernel.
Defines
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SCHED_FIFO (0x0100u)
FIFO scheduling policy.
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SCHED_RR (0x0200u)
Round-robin scheduling policy.
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SCHED_SPORADIC (0x0400u)
Sporadic scheduling policy. Not supported.
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SCHED_OTHER (0x0800u)
Other scheduling policy. Not supported.
Functions
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int sched_get_priority_max(int policy)
Return the highest priority value accepted by the scheduler.
The value is independent of
policy.- Parameters:
policy – Scheduling policy. Ignored.
- Returns:
Maximum priority value.
-
int sched_get_priority_min(int policy)
Return the lowest priority value usable by application threads.
The kernel’s idle thread sits below this value, so it is never returned. The value is independent of
policy.- Parameters:
policy – Scheduling policy. Ignored.
- Returns:
Minimum priority value.
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int sched_yield(void)
Surrender the CPU to the next runnable thread of equal or higher priority.
If no such thread exists the call returns immediately and the caller keeps running.
- Returns:
Always 0.
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int sched_getparam(pid_t pid, struct sched_param *param)
Not supported.
- Returns:
Always -1 and sets errno to ENOSYS.
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int sched_rr_get_interval(pid_t pid, struct timespec *interval)
Not supported.
- Returns:
Always -1 and sets errno to ENOSYS.
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int sched_setparam(pid_t pid, const struct sched_param *param)
Not supported.
- Returns:
Always -1 and sets errno to ENOSYS.
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int sched_setscheduler(pid_t pid, int policy, const struct sched_param *param)
Not supported.
- Returns:
Always -1 and sets errno to ENOSYS.