mirror of
https://github.com/jart/cosmopolitan.git
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69 lines
3.1 KiB
C
69 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/struct/sigset.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.h"
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#include "libc/nt/accounting.h"
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#include "libc/runtime/runtime.h"
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#include "libc/thread/thread.h"
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#define FT(x) (x.dwLowDateTime | (uint64_t)x.dwHighDateTime << 32)
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static int cpus;
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static double load;
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static pthread_spinlock_t lock;
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static struct NtFileTime idle1, kern1, user1;
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textwindows int sys_getloadavg_nt(double *a, int n) {
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int i, rc;
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uint64_t elapsed, used;
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struct NtFileTime idle, kern, user;
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BLOCK_SIGNALS;
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pthread_spin_lock(&lock);
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if (GetSystemTimes(&idle, &kern, &user)) {
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elapsed = (FT(kern) - FT(kern1)) + (FT(user) - FT(user1));
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if (elapsed) {
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used = elapsed - (FT(idle) - FT(idle1));
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load = (double)used / elapsed * cpus;
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load = MIN(MAX(load, 0), cpus * 2);
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idle1 = idle, kern1 = kern, user1 = user;
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}
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for (i = 0; i < n; ++i) {
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a[i] = load;
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}
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rc = n;
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} else {
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rc = __winerr();
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}
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pthread_spin_unlock(&lock);
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ALLOW_SIGNALS;
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return rc;
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}
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__attribute__((__constructor__(40))) static textstartup void ntinitload(void) {
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if (IsWindows()) {
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load = 1;
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cpus = __get_cpu_count() / 2;
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cpus = MAX(1, cpus);
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GetSystemTimes(&idle1, &kern1, &user1);
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}
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}
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