1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
// C++98 实现的多线程，依赖第三方库 pthread
#include <pthread.h>
#include <iostream>
using namespace std;
static long long total = 0;
pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;

void* func(void*)
{
    long long i;
    for (i = 0; i < 100000000L; ++i) {
        pthread_mutex_lock(&m);
        total += i;
        pthread_mutex_unlock(&m);
    }
    return NULL;
}

int main()
{
    pthread_t thread1, thread2;
    if  (pthread_create(&thread1, NULL, &func, NULL)) {
        throw;
    }
    if (pthread_create(&thread2, NULL, &func, NULL)) {
        throw;
    }

    pthread_join(thread1, NULL);
    pthread_join(thread2, NULL);

    cout << total << endl;

    return 0;
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
// C++11 实现的多线程
#include <atomic>
#include <thread>
#include <iostream>

using namespace std;

atomic_llong total{0};

void func(int )
{
    for (long long i = 0; i < 100000000LL; ++i) {
        total += i;
    }
}

int main()
{
    thread t1(func, 0);
    thread t2(func ,0);
    t1.join();
    t2.join();
    cout << total << endl;

    return 0;
}