GNU/Linux man pages
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GNU/Linux |
CentOS 4.8 |
i386 |
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sched_get_priority_max(2) |
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sched_get_priority_max, sched_get_priority_min − get static priority range
#include <sched.h>
int sched_get_priority_max(int policy);
int sched_get_priority_min(int policy);
sched_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 policy values are SCHED_FIFO, SCHED_RR, and SCHED_OTHER.
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 value range 1 to 99 for SCHED_FIFO and SCHED_RR and the priority 0 for SCHED_OTHER. 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_min. POSIX.1b requires a spread of at least 32 between the maximum and the minimum values for SCHED_FIFO and SCHED_RR.
POSIX systems on which sched_get_priority_max and sched_get_priority_min are available define _POSIX_PRIORITY_SCHEDULING in <unistd.h>.
On 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, errno is set appropriately.
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EINVAL |
The parameter policy does not identify a defined scheduling policy. |
POSIX.1b (formerly POSIX.4)
sched_setaffinity(2), sched_getaffinity(2), sched_setscheduler(2), sched_getscheduler(2), sched_setparam(2), sched_getparam(2)
sched_setscheduler(2) has a description of the Linux scheduling scheme.
Programming
for the real world − POSIX.4 by Bill O.
Gallmeister, O’Reilly & Associates, Inc., ISBN
1-56592-074-0
IEEE Std 1003.1b-1993 (POSIX.1b standard)
ISO/IEC 9945-1:1996
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sched_get_priority_max(2) | |