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sched_get_priority_min()函數(shù) Unix/Linux

sched_get_priority_max, sched_get_priority_min - 獲取靜態(tài)優(yōu)先級(jí)范圍

內(nèi)容簡(jiǎn)介

#include <sched.h>

int sched_get_priority_max(int policy);

int sched_get_priority_min(int policy);

DESCRIPTION

sched_get_priority_max() returns the maximum priority value that can be used with the scheduling algorithm identified by policysched_get_priority_min() returns the minimum priority value that can be used with the scheduling algorithm identified bypolicy. Supported policy values are SCHED_FIFOSCHED_RRSCHED_OTHER, andSCHED_BATCH. Further details about these policies can be found insched_setscheduler(2).

Processes with numerically higher priority values are scheduled before processes with numerically lower priority values. Thus, the value returned bysched_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 and SCHED_BATCH. 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.1-2001 requires a spread of at least 32 between the maximum and the minimum values forSCHED_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>.

返回值

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, and errno is set appropriately.

錯(cuò)誤

標(biāo)簽 描述
EINVAL 參數(shù)策略不識(shí)別定義的調(diào)度策略。

遵循于

POSIX.1-2001.

另請(qǐng)參閱

Programming for the real world - POSIX.4 by Bill O. Gallmeister, O’Reilly & Associates, Inc., ISBN 1-56592-074-0