Manpage of SCHED_GET_PRIORITY_MAX
SCHED_GET_PRIORITY_MAXSection: Linux Programmer's Manual (2)
NAMEsched_get_priority_max, sched_get_priority_min - get static priority range
int sched_get_priority_max(int policy);
DESCRIPTIONsched_get_priority_max() returns the maximum priority value that can be used with the scheduling algorithm identified by policy. sched_get_priority_min() returns the minimum priority value that can be used with the scheduling algorithm identified by policy. Supported policyvalues are SCHED_FIFO, SCHED_RR, SCHED_OTHER, SCHED_BATCH, SCHED_IDLE, and SCHED_DEADLINE. Further details about these policies can be found in sched(7).
Processes with numerically higher priority values are scheduled before processes with numerically lower priority values. Thus, the value returned by sched_get_priority_max() will be greater than the value returned by sched_get_priority_min().
Linux allows the static priority range 1 to 99 for the SCHED_FIFOand SCHED_RRpolicies, and the priority 0 for the remaining policies. Scheduling priority ranges for the various policies are not alterable.
The range of scheduling priorities may vary on other POSIX systems, thus it is a good idea for portable applications to use a virtual priority range and map it to the interval given by sched_get_priority_max() and sched_get_priority_minPOSIX.1 requires a spread of at least 32 between the maximum and the minimum values for SCHED_FIFOand SCHED_RR.
POSIX systems on which sched_get_priority_max() and sched_get_priority_min() are available define _POSIX_PRIORITY_SCHEDULINGin <unistd.h>.
RETURN VALUEOn success, sched_get_priority_max() and sched_get_priority_min() return the maximum/minimum priority value for the named scheduling policy. On error, -1 is returned, and errnois set appropriately.
- The argument policydoes not identify a defined scheduling policy.
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
SEE ALSOsched_getaffinity(2), sched_getparam(2), sched_getscheduler(2), sched_setaffinity(2), sched_setparam(2), sched_setscheduler(2), sched(7)
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