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Kernel/LibC: Implement sched_* functionality to set/get process priority

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Right now, we allow anything inside a user to raise or lower any other process's
priority. This feels simple enough to me. Linux disallows raising, but
that's annoying in practice.
This commit is contained in:
Robin Burchell 2019-05-29 23:20:51 +02:00 • committed by Andreas Kling
parent b160677e9e
commit 9cd0f6ffac
8 changed files with 103 additions and 1 deletions
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24
LibC/sched.cpp
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@ -10,5 +10,29 @@ int sched_yield()
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int sched_get_priority_min(int policy)
{
(void)policy;
return 0; // Idle
}
int sched_get_priority_max(int policy)
{
(void)policy;
return 3; // High
}
int sched_setparam(pid_t pid, const struct sched_param *param)
{
int rc = syscall(SC_sched_setparam, pid, param);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int sched_getparam(pid_t pid, struct sched_param *param)
{
int rc = syscall(SC_sched_getparam, pid, param);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
}

15
LibC/sched.h
View file

@ -1,9 +1,24 @@
#pragma once
#include <sys/types.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
int sched_yield();
struct sched_param {
int sched_priority;
};
#define SCHED_FIFO 0
#define SCHED_RR 1
#define SCHED_OTHER 2
#define SCHED_BATCH 3
int sched_get_priority_min(int policy);
int sched_get_priority_max(int policy);
int sched_setparam(pid_t pid, const struct sched_param *param);
int sched_getparam(pid_t pid, struct sched_param *param);
__END_DECLS

6
LibC/unistd.h
View file

@ -107,4 +107,10 @@ enum
#define X_OK 1
#define F_OK 0
/*
* We aren't fully compliant (don't support policies, and don't have a wide
* range of values), but we do have process priorities.
*/
#define _POSIX_PRIORITY_SCHEDULING
__END_DECLS