cpu_manager.cpp
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/*
* Copyright 2002-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* CC/LICENSE
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "cpu_manager.h"
#include "tools.h"
#include "lock.h"
CpuManager::CpuManager() {
_cpu_occupy = 0;
pthread_rwlock_init(&_rwlock, NULL);
}
CpuManager::~CpuManager() {
pthread_rwlock_destroy(&_rwlock);
}
CpuManager* CpuManager::get_instance() {
static CpuManager mgr;
return &mgr;
}
//获取cpu占用率
uint32_t CpuManager::get_cpu_occupy() {
uint32_t cpu_occupy = 0;
rw_lock_t lock(_rwlock);
if (lock.locked()) {
cpu_occupy = _cpu_occupy;
}
return cpu_occupy;
}
//获取cpu信息
void CpuManager::get_cpu_info(CPU_INFO* cpust) {
FILE* fd;
char buff[256];
CPU_INFO* cpu_occupy;
cpu_occupy = cpust;
if (NULL == (fd = fopen("/proc/stat", "r"))) {
return ;
}
fgets(buff, sizeof(buff), fd);
sscanf(buff, "%s %u %u %u %u", cpu_occupy->name,
&cpu_occupy->user, &cpu_occupy->nice, &cpu_occupy->system, &cpu_occupy->idle);
fclose(fd);
}
//通过cpu信息进行计算
uint32_t CpuManager::calc_cpu_info(CPU_INFO* first, CPU_INFO* second) {
uint32_t first_total = 0;
uint32_t second_total = 0;
uint32_t user = 0;
uint32_t system = 0;
uint32_t nice = 0;
uint32_t cpu_use = 0;
//第一次(用户+优先级+系统+空闲)总的时间
first_total = (uint32_t)(first->user + first->nice + first->system + first->idle);
//第二次(用户+优先级+系统+空闲)总的时间
second_total = (uint32_t)(second->user + second->nice + second->system + second->idle);
user = (uint32_t)(second->user - first->user); //用户第一次和第二次的时间之差
system = (uint32_t)(second->system - first->system); //系统第一次和第二次的时间之差
nice = (uint32_t)(second->nice - first->nice); //nice第一次和第二次的时间之差
if (second_total != first_total) {
//((用户+系统+nice)*100)除(第一次和第二次的时间差)再赋给g_cpu_used
cpu_use = (uint32_t)((system + user + nice) * 100) / (second_total - first_total);
} else {
cpu_use = 0;
}
return cpu_use;
}
//计算CPU占用率线程 阻塞函数
void CpuManager::calculate_cpu_occupy_block_func() {
CPU_INFO cpu_info1;
CPU_INFO cpu_info2;
uint32_t cpu_occupy = 0;
while (!g_stopped) {
//第一次获取cpu使用情况
get_cpu_info((CPU_INFO*)&cpu_info1);
ivr_tools_t::safe_sleeps(1);
//第二次获取cpu使用情况
get_cpu_info((CPU_INFO*)&cpu_info2);
//计算cpu使用率
cpu_occupy = calc_cpu_info((CPU_INFO*)&cpu_info1, (CPU_INFO*)&cpu_info2);
rw_lock_t lock(_rwlock, true);
if (lock.locked()) {
_cpu_occupy = cpu_occupy;
}
}
return;
}