APUE// linux 线程创建及退出
2019-03-14 本文已影响0人
ustclcl
1 // APUE example 11-2
2 // lcl 20190314
3
4 #include "../myapue.h"
5 #include <pthread.h>
6
7 pthread_t ntid;
8
9 void printids(const char *s)
10 {
11 pid_t pid;
12 pthread_t tid;
13
14 pid = getpid();
15 tid = pthread_self();
16 printf("%s pid %lu tid %lu (0x%lx)\n",s,(unsigned long)pid,(unsigned long)tid,(unsigned long)tid);
17 }
18
19 void * thr_fn(void *arg)
20 {
21 printids("new thread: ");
22 return ((void*)0);
23 }
24
25 int main (void)
26 {
27 int err;
28 err = pthread_create(&ntid, NULL, thr_fn, NULL);
29 if (err != 0)
30 printf("can't create thread\n");
31 printids("main thread: ");
32 sleep(1);
33 exit(0);
34 }
编译时需要链接pthread，因为pthread不是标准库
[root@f3c6f9f95723 ch11]# gcc pthr.c -lpthread -g -o pthr
[root@f3c6f9f95723 ch11]# ./pthr
main thread: pid 63 tid 140407368517440 (0x7fb323530740)
new thread: pid 63 tid 140407360116480 (0x7fb322d2d700)
线程退出，接收退出码
1 // APUE example 11-2
2 // lcl 20190304
3
4 #include "../myapue.h"
5 #include <pthread.h>
6
7 void *thr_fn1(void *arg)
8 {
9 printf("thread 1 returning\n");
10 return ((void *) 1);
11 }
12
13 void *thr_fn2(void *arg)
14 {
15 printf("thread 2 exiting\n");
16 pthread_exit((void *)2);
17 }
18
19 int main(void)
20 {
21 int err;
22 pthread_t tid1,tid2;
23 void *tret;
24
25 err = pthread_create(&tid1, NULL, thr_fn1, NULL);
26 if(err != 0)
27 printf("err %d, can't create thread 1\n",err);
28 err = pthread_create(&tid2, NULL, thr_fn2, NULL);
29 if (err != 0)
30 printf("err %d, can't create thread 2\n",err);
31 err = pthread_join(tid1, &tret);
32 if (err != 0)
33 printf("err %d, can't join with thread1\n",err);
34 printf("thread 1 exit code %ld\n",(long)tret);
35 err = pthread_join(tid2, &tret);
36 if (err != 0)
37 printf("err %d, can't join with thread2\n",err);
38 printf("thread 2 exit code %ld\n",(long)tret);
39 exit(0);
40 }
[root@f3c6f9f95723 ch11]# gcc get_exit_of_thread.c -g -lpthread -o get_exit_of_thread
[root@f3c6f9f95723 ch11]# ./get_exit_of_thread
thread 1 returning
thread 1 exit code 1
thread 2 exiting
thread 2 exit code 2
线程退出时返回地址，此地址在线程退出后被覆盖的例子
// APUE example 11-4
// lcl 20190314
/******************************************
[root@f3c6f9f95723 ch11]# ./exit_thread_err
structure at 0x7f33a3ce7f00
foo.a = 1
foo.b = 2
foo.c = 3
foo.d = 4
parent create a second thread:
thread 2: ID is 139859768280832
structure at 0x7ffebf271120
foo.a = -1546748160
foo.b = 32563
foo.c = -1087952529
foo.d = 32766
******************************************/
#include "../myapue.h"
#include <pthread.h>
struct foo {
int a, b, c, d;
};
void printfoo(const char *s, const struct foo *fp)
{
printf("%",s);
printf(" structure at 0x%lx\n", (unsigned long)fp);
printf(" foo.a = %d\n",fp->a);
printf(" foo.b = %d\n",fp->b);
printf(" foo.c = %d\n",fp->c);
printf(" foo.d = %d\n",fp->d);
}
void *thr_fn1(void *arg)
{
struct foo foo1 = {1,2,3,4};
printfoo("thread 1:\n", &foo1);
pthread_exit((void*)&foo1);
}
void *thr_fn2(void *arg)
{
printf("thread 2: ID is %lu\n",(unsigned long)pthread_self());
pthread_exit((void *)0);
}
int main(void)
{
int err;
pthread_t tid1,tid2;
struct foo *fp;
err = pthread_create(&tid1, NULL, thr_fn1, NULL);
if(err != 0)
printf("err %d, can't create thread 1\n",err);
err = pthread_join(tid1, (void*)fp);
if (err != 0)
printf("err %d, can't join with thread1\n",err);
sleep(1);
printf("parent create a second thread:\n");
err = pthread_create(&tid2, NULL, thr_fn2, NULL);
if (err != 0)
printf("err %d, can't create thread 2\n",err);
sleep(1);
printfoo("parent:\n",fp);
exit(0);
}
