1、多进程编程
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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int main()
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{
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pid_t child_pid;
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child_pid = fork();
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if(child_pid == 0)
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{
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printf("child pid\n");
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exit(0);
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}
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else
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{
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printf("father pid\n");
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sleep(60);
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}
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return 0;
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}
2、多线程编程
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#include <stdio.h>
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#include <pthread.h>
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struct char_print_params
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{
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char character;
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int count;
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};
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void *char_print(void *parameters)
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{
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struct char_print_params *p = (struct char_print_params *)parameters;
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int i;
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for(i = 0; i < p->count; i++)
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{
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fputc(p->character,stderr);
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}
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return NULL;
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}
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int main()
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{
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pthread_t thread1_id;
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pthread_t thread2_id;
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struct char_print_params thread1_args;
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struct char_print_params thread2_args;
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thread1_args.character = ‘x‘;
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thread1_args.count = 3000;
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pthread_create(&thread1_id, NULL, &char_print, &thread1_args);
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thread2_args.character = ‘o‘;
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thread2_args.count = 2000;
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pthread_create(&thread2_id, NULL, &char_print, &thread2_args);
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pthread_join(thread1_id, NULL);
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pthread_join(thread2_id, NULL);
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return 0;
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}
3、线程同步与互斥
1）、互斥
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pthread_mutex_t mutex;
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pthread_mutex_init(&mutex, NULL);
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pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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pthread_mutex_lock(&mutex);
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thread_flag = value;
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pthread_mutex_unlock(&mutex);
2）、条件变量
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int thread_flag = 0;
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pthread_mutex_t mutex;
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pthread_cond_t thread_flag_cv;\
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void init_flag()
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{
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pthread_mutex_init(&mutex, NULL);
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pthread_cond_init(&thread_flag_cv, NULL);
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thread_flag = 0;
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}
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void *thread_function(void *thread_flag)
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{
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while(1)
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{
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pthread_mutex_lock(&mutex);
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while(thread_flag != 0 )
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{
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pthread_cond_wait(&thread_flag_cv, &mutex);
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}
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pthread_mutex_unlock(&mutex);
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do_work();
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}
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return NULL;
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}
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void set_thread_flag(int flag_value)
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{
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pthread_mutex_lock(&mutex);
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thread_flag = flag_value;
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pthread_cond_signal(&thread_flag_cv);
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pthread_mutex_unlock(&mutex);
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}
linux下的C\C++多进程多线程编程
原文：http://blog.csdn.net/nyist327/article/details/44958585
