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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "system_wrappers/source/cpu_linux.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
namespace webrtc {
CpuLinux::CpuLinux()
: old_busy_time_(0),
old_idle_time_(0),
old_busy_time_multi_(NULL),
old_idle_time_multi_(NULL),
idle_array_(NULL),
busy_array_(NULL),
result_array_(NULL),
num_cores_(0) {
const int result = GetNumCores();
if (result != -1) {
num_cores_ = result;
old_busy_time_multi_ = new long long[num_cores_];
memset(old_busy_time_multi_, 0, sizeof(long long) * num_cores_);
old_idle_time_multi_ = new long long[num_cores_];
memset(old_idle_time_multi_, 0, sizeof(long long) * num_cores_);
idle_array_ = new long long[num_cores_];
memset(idle_array_, 0, sizeof(long long) * num_cores_);
busy_array_ = new long long[num_cores_];
memset(busy_array_, 0, sizeof(long long) * num_cores_);
result_array_ = new WebRtc_UWord32[num_cores_];
GetData(old_busy_time_, old_idle_time_, busy_array_, idle_array_);
}
}
CpuLinux::~CpuLinux() {
delete [] old_busy_time_multi_;
delete [] old_idle_time_multi_;
delete [] idle_array_;
delete [] busy_array_;
delete [] result_array_;
}
WebRtc_Word32 CpuLinux::CpuUsage() {
WebRtc_UWord32 dummy = 0;
WebRtc_UWord32* dummy_array = NULL;
return CpuUsageMultiCore(dummy, dummy_array);
}
WebRtc_Word32 CpuLinux::CpuUsageMultiCore(WebRtc_UWord32& num_cores,
WebRtc_UWord32*& core_array) {
core_array = result_array_;
num_cores = num_cores_;
long long busy = 0;
long long idle = 0;
if (GetData(busy, idle, busy_array_, idle_array_) != 0)
return -1;
long long delta_busy = busy - old_busy_time_;
long long delta_idle = idle - old_idle_time_;
old_busy_time_ = busy;
old_idle_time_ = idle;
int ret_val = -1;
if (delta_busy + delta_idle == 0) {
ret_val = 0;
} else {
ret_val = (int)(100 * (delta_busy) / (delta_busy + delta_idle));
}
if (core_array == NULL) {
return ret_val;
}
for (WebRtc_UWord32 i = 0; i < num_cores_; ++i) {
delta_busy = busy_array_[i] - old_busy_time_multi_[i];
delta_idle = idle_array_[i] - old_idle_time_multi_[i];
old_busy_time_multi_[i] = busy_array_[i];
old_idle_time_multi_[i] = idle_array_[i];
if (delta_busy + delta_idle == 0) {
core_array[i] = 0;
} else {
core_array[i] = (int)(100 * (delta_busy) / (delta_busy + delta_idle));
}
}
return ret_val;
}
int CpuLinux::GetData(long long& busy, long long& idle, long long*& busy_array,
long long*& idle_array) {
FILE* fp = fopen("/proc/stat", "r");
if (!fp) {
return -1;
}
char line[100];
if (fgets(line, 100, fp) == NULL) {
fclose(fp);
return -1;
}
char first_word[100];
if (sscanf(line, "%s ", first_word) != 1) {
fclose(fp);
return -1;
}
if (strncmp(first_word, "cpu", 3) != 0) {
fclose(fp);
return -1;
}
char s_user[100];
char s_nice[100];
char s_system[100];
char s_idle[100];
if (sscanf(line, "%s %s %s %s %s ",
first_word, s_user, s_nice, s_system, s_idle) != 5) {
fclose(fp);
return -1;
}
long long luser = atoll(s_user);
long long lnice = atoll(s_nice);
long long lsystem = atoll(s_system);
long long lidle = atoll(s_idle);
busy = luser + lnice + lsystem;
idle = lidle;
for (WebRtc_UWord32 i = 0; i < num_cores_; ++i) {
if (fgets(line, 100, fp) == NULL) {
fclose(fp);
return -1;
}
if (sscanf(line, "%s %s %s %s %s ", first_word, s_user, s_nice, s_system,
s_idle) != 5) {
fclose(fp);
return -1;
}
luser = atoll(s_user);
lnice = atoll(s_nice);
lsystem = atoll(s_system);
lidle = atoll(s_idle);
busy_array[i] = luser + lnice + lsystem;
idle_array[i] = lidle;
}
fclose(fp);
return 0;
}
int CpuLinux::GetNumCores() {
FILE* fp = fopen("/proc/stat", "r");
if (!fp) {
return -1;
}
// Skip first line
char line[100];
if (!fgets(line, 100, fp)) {
fclose(fp);
return -1;
}
int num_cores = -1;
char first_word[100];
do {
num_cores++;
if (fgets(line, 100, fp)) {
if (sscanf(line, "%s ", first_word) != 1) {
first_word[0] = '\0';
}
} else {
break;
}
} while (strncmp(first_word, "cpu", 3) == 0);
fclose(fp);
return num_cores;
}
} // namespace webrtc
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