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

#include

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

#include

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);

}

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