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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/calls/setpriority-nt.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.h"
#include "libc/calls/internal.h"
#include "libc/calls/kntprioritycombos.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thread.h"
static textwindows struct NtPriorityCombo findntprio(int nice) {
size_t l, r, m;
l = 0;
r = kNtPriorityCombosLen;
while (l < r) {
m = (l + r) >> 1;
if (kNtPriorityCombos[m].nice > nice) {
r = m;
} else {
l = m + 1;
}
}
return kNtPriorityCombos[max(0, l - 1)];
}
textwindows int setpriority$nt(int nice) {
uint32_t tier;
struct NtPriorityCombo p;
p = findntprio(nice);
tier = 1 << (p.lg2tier - 1);
if (SetPriorityClass(GetCurrentProcess(), tier) &&
SetThreadPriority(GetCurrentThread(), p.wut)) {
return p.nice;
} else {
return winerr();
}
}