pthread

pkill 可以单独向某一个线程发信号：

两个线程都注册了SIGUSR1信号，但只有线程tid1收到该信号

 1 #include "apue.h"
 2 #include <pthread.h>
 3 
 4 #define LOGI(format,...) printf("function: %s",format,__FUNCTION__, __VA_ARGS__)
 5 
 6 void sig_handle(int signo)
 7 {
 8     printf("%s:tid: (0x%lx) signo:%d
",__FUNCTION__, (unsigned long)pthread_self(),signo);
 9     pthread_exit((void*)3);
10 }
11 void *
12 thr_fn1(void *arg)
13 {
14         signal(SIGUSR1,sig_handle);
15         pid_t        pid;
16     pthread_t    tid;
17 
18     pid = getpid();
19     tid = pthread_self();
20                 
21     printf("thread 1 start
");
22         printf("pid %lu tid %lu (0x%lx)
", (unsigned long)pid,
23       (unsigned long)tid, (unsigned long)tid);
24         while(1);
25         printf("thread 1 end
");
26     return((void *)1);
27 }
28 
29 void sig_handle2(int signo)
30 {
31     printf("%s: tid: (0x%lx) signo:%d
", __FUNCTION__, (unsigned long)pthread_self(),signo);
32     pthread_exit((void*)20);
33 }
34 
35 void *
36 thr_fn2(void *arg)
37 {
38         signal(SIGUSR1,sig_handle2);  
39      pid_t        pid;
40     pthread_t    tid;
41 
42     pid = getpid();
43     tid = pthread_self();
44     printf("thread 2 start
");
45     printf("pid %lu tid %lu (0x%lx)
", (unsigned long)pid,
46       (unsigned long)tid, (unsigned long)tid);
47         sleep(12);
48     printf("thread 2 end
");
49     pthread_exit((void *)2);
50 }
51 
52 int
53 main(void)
54 {
55     int            err;
56     pthread_t    tid1, tid2;
57     void        *tret;
58 
59     err = pthread_create(&tid1, NULL, thr_fn1, NULL);
60     if (err != 0)
61         err_exit(err, "can't create thread 1");
62     err = pthread_create(&tid2, NULL, thr_fn2, NULL);
63     if (err != 0)
64         err_exit(err, "can't create thread 2");
65     
66         sleep(2);
67 
68         pthread_kill(tid1,SIGUSR1);
69 
70         err = pthread_join(tid1, &tret);
71     if (err != 0)
72         err_exit(err, "can't join with thread 2");
73     printf("thread 1 exit code %ld
", (long)tret);
74  
75         err = pthread_join(tid2, &tret);
76     if (err != 0)
77         err_exit(err, "can't join with thread 1");
78     printf("thread 2 exit code %ld
", (long)tret);
79     
80     
81     exit(0);
82 }

运行结果：

w00367381@ubuntu:~/apue.3e/threads$ ./exitstatus 
thread 2 start
pid 3651 tid 140564637652736 (0x7fd7c14b9700)
thread 1 start
pid 3651 tid 140564646045440 (0x7fd7c1cba700)
sig_handle:tid: (0x7fd7c1cba700) signo:10
thread 1 exit code 3
thread 2 end
thread 2 exit code 2