[TOC]
源代码
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| #include <iostream>
#include <thread>
void work1(int& sum) {
for (int i = 1; i < 5000; i++) {
sum += i;
}
}
void work2(int& sum) {
for (int i = 5000; i <= 10000; i++) {
sum += i;
}
}
int fun() {
int sum = 0;
for (int i = 1; i <= 10000; i++) {
sum += i;
}
return sum;
}
int main()
{
int ans = 0;
std::thread t1(work1, std::ref(ans));
std::thread t2(work2, std::ref(ans));
t1.join();
t2.join();
std::cout << "sum1 : " << ans << std::endl;
std::cout << "sum2 : " << fun() << std::endl;
return 0;
}
|
第一实现 mutex参数lock， unlock
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| #include <iostream>
#include <thread>
#include <mutex>
void work1(int& sum, std::mutex& mylock) {
for (int i = 1; i < 5000; i++) {
mylock.lock();
sum += i;
mylock.unlock();
}
}
void work2(int& sum, std::mutex& mylock) {
for (int i = 5000; i <= 10000; i++) {
mylock.lock();
sum += i;
mylock.unlock();
}
}
int fun() {
int sum = 0;
for (int i = 1; i <= 10000; i++) {
sum += i;
}
return sum;
}
int main()
{
std::mutex mylock;
int ans = 0;
std::thread t1(work1, std::ref(ans), std::ref(mylock));
std::thread t2(work2, std::ref(ans), std::ref(mylock));
t1.join();
t2.join();
std::cout << "sum1 : " << ans << std::endl;
std::cout << "sum2 : " << fun() << std::endl;
return 0;
}
|
第二种 lock_guard类模板
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| #include <iostream>
#include <thread>
#include <mutex>
void work1(int& sum, std::mutex& mylock) {
for (int i = 1; i < 5000; i++) {
std::lock_guard<std::mutex> mylock_guard(mylock);
sum += i;
}
}
void work2(int& sum, std::mutex& mylock) {
for (int i = 5000; i <= 10000; i++) {
std::lock_guard<std::mutex> mylock_guard(mylock);
sum += i;
}
}
int fun() {
int sum = 0;
for (int i = 1; i <= 10000; i++) {
sum += i;
}
return sum;
}
int main()
{
std::mutex mylock;
int ans = 0;
std::thread t1(work1, std::ref(ans), std::ref(mylock));
std::thread t2(work2, std::ref(ans), std::ref(mylock));
t1.join();
t2.join();
std::cout << "sum1 : " << ans << std::endl;
std::cout << "sum2 : " << fun() << std::endl;
return 0;
}
|
https://cloud.tencent.com/developer/article/1583894
