cosmopolitan/libc/calls/getloadavg-nt.c
Jōshin e16a7d8f3b
flip et / noet in modelines
`et` means `expandtab`.

```sh
rg 'vi: .* :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\)  :vi/vi: \1 xoet\2:vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2  :vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/'
```
2023-12-07 22:17:11 -05:00

73 lines
3.2 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/struct/sigset.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/fmt/conv.h"
#include "libc/macros.internal.h"
#include "libc/nt/accounting.h"
#include "libc/runtime/runtime.h"
#include "libc/thread/thread.h"
#define FT(x) (x.dwLowDateTime | (uint64_t)x.dwHighDateTime << 32)
static int cpus;
static double load;
static pthread_spinlock_t lock;
static struct NtFileTime idle1, kern1, user1;
textwindows int sys_getloadavg_nt(double *a, int n) {
int i, rc;
uint64_t elapsed, used;
struct NtFileTime idle, kern, user;
BLOCK_SIGNALS;
pthread_spin_lock(&lock);
if (GetSystemTimes(&idle, &kern, &user)) {
elapsed = (FT(kern) - FT(kern1)) + (FT(user) - FT(user1));
if (elapsed) {
used = elapsed - (FT(idle) - FT(idle1));
load = (double)used / elapsed * cpus;
load = MIN(MAX(load, 0), cpus * 2);
idle1 = idle, kern1 = kern, user1 = user;
}
for (i = 0; i < n; ++i) {
a[i] = load;
}
rc = n;
} else {
rc = __winerr();
}
pthread_spin_unlock(&lock);
ALLOW_SIGNALS;
return rc;
}
static textstartup void sys_getloadavg_nt_init(void) {
if (IsWindows()) {
load = 1;
cpus = __get_cpu_count() / 2;
cpus = MAX(1, cpus);
GetSystemTimes(&idle1, &kern1, &user1);
}
}
const void *const sys_getloadavg_nt_ctor[] initarray = {
sys_getloadavg_nt_init,
};