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unix: factor out reusable sysinfo loadavg impl

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On Linux we use `sysinfo(2)` to look up the load average.
Factor out a dedicated source file to make this implementation
available for use on other platforms that support it.

PR-URL: https://github.com/libuv/libuv/pull/1312
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
This commit is contained in:
Brad King 2017-04-04 15:39:36 -04:00 committed by Ben Noordhuis
parent ea795b29ef
commit 76bcf9f91d
4 changed files with 39 additions and 11 deletions
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1
Makefile.am
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@ -378,6 +378,7 @@ libuv_la_SOURCES += src/unix/linux-core.c \
src/unix/linux-syscalls.c \
src/unix/linux-syscalls.h \
src/unix/proctitle.c \
src/unix/sysinfo-loadavg.c \
src/unix/sysinfo-memory.c
test_run_tests_LDFLAGS += -lutil
endif

11
src/unix/linux-core.c
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@ -472,17 +472,6 @@ uint64_t uv__hrtime(uv_clocktype_t type) {
}
void uv_loadavg(double avg[3]) {
struct sysinfo info;
if (sysinfo(&info) < 0) return;
avg[0] = (double) info.loads[0] / 65536.0;
avg[1] = (double) info.loads[1] / 65536.0;
avg[2] = (double) info.loads[2] / 65536.0;
}
int uv_exepath(char* buffer, size_t* size) {
ssize_t n;

36
src/unix/sysinfo-loadavg.c Normal file
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@ -0,0 +1,36 @@
/* Copyright libuv project contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#include <stdint.h>
#include <sys/sysinfo.h>
void uv_loadavg(double avg[3]) {
struct sysinfo info;
if (sysinfo(&info) < 0) return;
avg[0] = (double) info.loads[0] / 65536.0;
avg[1] = (double) info.loads[1] / 65536.0;
avg[2] = (double) info.loads[2] / 65536.0;
}

2
uv.gyp
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@ -237,6 +237,7 @@
'src/unix/linux-inotify.c',
'src/unix/linux-syscalls.c',
'src/unix/linux-syscalls.h',
'src/unix/sysinfo-loadavg.c',
'src/unix/sysinfo-memory.c',
],
'link_settings': {
@ -252,6 +253,7 @@
'src/unix/pthread-fixes.c',
'src/unix/android-ifaddrs.c',
'src/unix/pthread-barrier.c'
'src/unix/sysinfo-loadavg.c',
'src/unix/sysinfo-memory.c',
],
'link_settings': {