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53 lines
2.8 KiB
C
53 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/sched-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/sysv/consts/sched.h"
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#include "libc/sysv/errfuns.h"
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static int sys_sched_get_priority_max_netbsd(int policy) {
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if (policy == SCHED_OTHER) {
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return -1;
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} else if (policy == SCHED_RR || policy == SCHED_FIFO) {
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return 63; // NetBSD Libc needs 19 system calls to compute this!
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} else {
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return einval();
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}
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}
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/**
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* Returns maximum `sched_param::sched_priority` for `policy`.
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*
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* @return priority, or -1 w/ errno
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* @raise ENOSYS on XNU, Windows, OpenBSD
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* @raise EINVAL if `policy` is invalid
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*/
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int sched_get_priority_max(int policy) {
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int rc;
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if (IsNetbsd()) {
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rc = sys_sched_get_priority_max_netbsd(policy);
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} else {
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rc = sys_sched_get_priority_max(policy);
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}
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STRACE("sched_get_priority_max(%s) → %d% m", DescribeSchedPolicy(policy), rc);
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return rc;
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}
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