C++ & Python 多线程笔记

C++

Posix多线程

#include <stdio.h>#include <stdlib.h>#include <pthread.h>#include <vector>using std::vector;void* Proc(void* arg){    pthread_t pthread = *(pthread_t *)arg;    printf("this is thread %ld\n", pthread);}int main(int argc, char** argv){    if (argc != 2)    {        printf("usage:%s thread_num", argv[0]);        return 1;    }    int thread_num = atoi(argv[1]);    vector<pthread_t> threads(thread_num);    for (int i = 0; i < thread_num; ++i)    {        pthread_t pthread;        pthread_create(&pthread, NULL, &Proc, &threads[i]);        threads[i] = pthread;    }    for (vector<pthread_t>::iterator it = threads.begin(); it != threads.end(); ++it)    {        pthread_join(*it, NULL);    }    return 0;}

boost多线程

全局函数作为线程函数

#include <stdio.h>#include <stdlib.h>#include <pthread.h>#include <vector>#include <string>#include <boost/thread.hpp>using std::vector;using std::string;void Proc(int num, const string& str){    printf("this is thread %d, say %s\n", num, str.c_str());}int main(int argc, char** argv){    if (argc != 2)    {        printf("usage:%s thread_num", argv[0]);        return 1;    }    int thread_num = atoi(argv[1]);    vector<boost::thread*> threads;    for (int i = 0; i < thread_num; ++i)    {        boost::thread* thread = new boost::thread(&Proc, i, "Hello World!");        threads.push_back(thread);        }    for (vector<boost::thread*>::iterator it = threads.begin(); it != threads.end(); ++it)    {        (*it)->join();    }    return 0;}

类成员函数作为线程函数

#include <stdio.h>#include <stdlib.h>#include <pthread.h>#include <vector>#include <string>#include <boost/thread.hpp>#include <boost/bind.hpp>using std::vector;using std::string;class Test{public:    void Proc(int num, const string& str)    {        printf("this is thread %d, say %s\n", num, str.c_str());    }};int main(int argc, char** argv){    if (argc != 2)    {        printf("usage:%s thread_num", argv[0]);        return 1;    }    int thread_num = atoi(argv[1]);    vector<boost::thread*> threads;    for (int i = 0; i < thread_num; ++i)    {        Test* test = new Test();        boost::thread* thread = new boost::thread(boost::bind(&Test::Proc, test, i, "Hello World!"));        threads.push_back(thread);        }    for (vector<boost::thread*>::iterator it = threads.begin(); it != threads.end(); ++it)    {        (*it)->join();    }    return 0;}

Python

使用threading模块

import sysimport threadingdef proc(num, str):    print 'this is thread %d, say %s' % (num, str)def start_threads(thread_num):    threads = []    for i in range(thread_num):        thread = threading.Thread(target=proc, args=(i, "Hello World!"))        threads.append(thread)        thread.start()    for thread in threads:        thread.join()if __name__ == '__main__':    if len(sys.argv) != 2:        print "usage:%s thread_num" % sys.argv[0]        sys.exit(1)    start_threads(int(sys.argv[1]))

使用multiprocessing模块

import sysfrom multiprocessing.dummy import Pool as ThreadPooldef proc(arg):    num, str = arg    print 'this is thread %d, say %s' % (num, str)def start_threads(thread_num):    pool = ThreadPool(thread_num)    args = []    for i in range(thread_num):        args.append((i, "Hello World!"))    pool.map(proc, args)    pool.close()    pool.join()if __name__ == '__main__':    if len(sys.argv) != 2:        print "usage:%s thread_num" % sys.argv[0]        sys.exit(1)    start_threads(int(sys.argv[1]))