欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  网络运营

linux下的C\C++多进程多线程编程实例详解

程序员文章站 2023-11-23 15:28:28
linux下的c\c++多进程多线程编程实例详解 1、多进程编程 #include #include

linux下的c\c++多进程多线程编程实例详解

1、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; 
} 

 2、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; 
} 

 3、线程同步与互斥

1)、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); 

2)、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); 
} 

感谢阅读,希望能帮助到大家,谢谢大家对本站的支持!