pthread_join 用來等待線程結束
不希望等待線程結束 就是用脫離狀态(備注:程序結束了線程依然會結束)
根據文檔 join 和 detached 要設定其中一種 否則多線程容易造成記憶體洩漏
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<pthread.h>
void *thread_function(void *arg);
char message[] = "Hello World";
int thread_exited = ;
int main(){
int res;
pthread_t a_thread;
void *thread_result;
pthread_attr_t thread_attr;
//不設定此屬性也可以正常運作
//根據文檔 join 和 detached 要設定其中一種 否則多線程容易造成記憶體洩漏
pthread_attr_init(&thread_attr);
pthread_attr_setdetachstate(&thread_attr,PTHREAD_CREATE_DETACHED);
//設定排程屬性
int max_priority;
int min_priority;
struct sched_param scheduling_value;
//排程範圍
max_priority = sched_get_priority_max(SCHED_OTHER);
min_priority = sched_get_priority_min(SCHED_OTHER);
scheduling_value.sched_priority = min_priority;
pthread_attr_setschedparam(&thread_attr,&scheduling_value);
res = pthread_create(&a_thread,&thread_attr,thread_function,(void *)message);
if(res != ){
perror("Thread creation failed");
exit(EXIT_FAILURE);
}
printf("Waiting for thread to finish...\n");
//res = pthread_join(a_thread,&thread_result);
//printf("Thread joined,it returned %s\n",(char *)thread_result);
while(!thread_exited){
printf("I'm waiting...\n");
sleep();
}
printf("Message is now %s\n",message);
exit(EXIT_SUCCESS);
}
void *thread_function(void *arg){
printf("thread_function is running, Argument was %s\n",(char *)arg);
sleep();
strcpy(message,"Bye!");
thread_exited = ;
pthread_exit("Thank you ro the CPU time");
}