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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;
}
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;
}
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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