linux下的C\C++多进程多线程编程简易例子

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多进程编程

#include <stdlib.h>#include <sys/types.h>#include <unistd.h>int main(){pid_t child_pid;/* 创建一个子进程 */child_pid = fork();if(child_pid == 0){printf("child pid\n");exit(0);}else{printf("father pid\n");sleep(60);}return 0;}

多线程编程

#include <stdio.h>#include <pthread.h>struct char_print_params{char character;int count;};void *char_print(void *parameters){struct char_print_params *p = (struct char_print_params *)parameters;int i;for(i = 0; i < p->count; i++){fputc(p->character,stderr);}return NULL;}int main(){pthread_t thread1_id;pthread_t thread2_id;struct char_print_params thread1_args;struct char_print_params thread2_args;thread1_args.character = 'x';thread1_args.count = 3000;pthread_create(&thread1_id, NULL, &char_print, &thread1_args);thread2_args.character = 'o';thread2_args.count = 2000;pthread_create(&thread2_id, NULL, &char_print, &thread2_args);pthread_join(thread1_id, NULL);pthread_join(thread2_id, NULL);return 0;}

线程同步与互斥

互斥

pthread_mutex_t mutex;pthread_mutex_init(&mutex, NULL);/*也可以用下面的方式初始化*/pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;pthread_mutex_lock(&mutex);/*  互斥   */thread_flag = value;pthread_mutex_unlock(&mutex);

条件变量

int thread_flag = 0;pthread_mutex_t mutex;pthread_cond_t thread_flag_cv;\void init_flag(){pthread_mutex_init(&mutex, NULL);pthread_cond_init(&thread_flag_cv, NULL);thread_flag = 0;}void *thread_function(void *thread_flag){while(1){pthread_mutex_lock(&mutex);while(thread_flag != 0 ){pthread_cond_wait(&thread_flag_cv, &mutex);}pthread_mutex_unlock(&mutex);do_work();}return NULL;}void set_thread_flag(int flag_value){pthread_mutex_lock(&mutex);thread_flag = flag_value;pthread_cond_signal(&thread_flag_cv);pthread_mutex_unlock(&mutex);}

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