Linux多线程实例练习

Linux多线程实例练习 pthread_create()：创建一个线程

int pthread_create(pthread_t *tidp,
        const pthread_attr_t *attr,
        (void*)(*start_rtn)(void*),
        void *arg);

1、代码如下 xx_pthread_create.c

 1 #include <pthread.h>
 2 #include <stdio.h>
 3 #include <unistd.h>
 4 #include <sys/time.h>   // for gettimeofday
 5 
 6 #define debugMsg(fmt, arg...)
 7     do{
 8         unsigned long lSec = 0; unsigned long lUSec = 0;
 9         getTimeuSec(&lSec, &lUSec);
10         printf("[%ld.%06ld]:", lSec, lUSec);                                                        
11         printf(fmt, ##arg);
12     }while(0)
13 
14 int getTimeuSec(unsigned long *lSec, unsigned long *lUSec)
15 {
16     struct timeval start;
17     gettimeofday( &start, NULL );
18     *lSec = start.tv_sec;
19     *lUSec = start.tv_usec;
20 
21     return 0;
22 }
23 void * doPrint(void *arg)
24 {
25     int i = 0;
26     while(i < 30)
27     {
28         debugMsg("pthread %2d; main %d
", i++, *(int*)arg);
29         usleep(200000);
30     }
31 
32     return NULL;
33 }
34 
35 int main()
36 {
37     pthread_t pid;
38     int iX = 123;
39     pthread_create(&pid, NULL, doPrint, &iX);
40     while(iX <= 20 + 123)
41     {
42         debugMsg("main : %d
", iX++);
43         usleep(300000);
44     }
45 
46     return 0;
47 }

2、CentOS 下编译通过

g++ -g -c -o xx_pthread_create.o xx_pthread_create.c 
g++ -g -o xx_pthread_create xx_pthread_create.o -lpthread

3、运行结果

[1422496189.763862]:main : 123
[1422496189.764341]:pthread  0; main 124
[1422496189.965627]:pthread  1; main 124
[1422496190.065601]:main : 124
[1422496190.166510]:pthread  2; main 125
[1422496190.366393]:main : 125
[1422496190.367391]:pthread  3; main 126
[1422496190.568275]:pthread  4; main 126
[1422496190.667215]:main : 126
[1422496190.769157]:pthread  5; main 127
[1422496190.968039]:main : 127
[1422496190.970323]:pthread  6; main 128
[1422496191.171922]:pthread  7; main 128
[1422496191.269869]:main : 128
[1422496191.373803]:pthread  8; main 129
[1422496191.571696]:main : 129
[1422496191.574958]:pthread  9; main 130
[1422496191.776566]:pthread 10; main 130
[1422496191.873512]:main : 130
[1422496191.977457]:pthread 11; main 131
[1422496192.174348]:main : 131
[1422496192.178362]:pthread 12; main 132
[1422496192.379214]:pthread 13; main 132
[1422496192.475159]:main : 132
[1422496192.580095]:pthread 14; main 133
[1422496192.776006]:main : 133
[1422496192.781267]:pthread 15; main 134
[1422496192.981968]:pthread 16; main 134
[1422496193.076864]:main : 134
[1422496193.182797]:pthread 17; main 135
[1422496193.377656]:main : 135
[1422496193.384089]:pthread 18; main 136
[1422496193.584595]:pthread 19; main 136
[1422496193.678472]:main : 136
[1422496193.785406]:pthread 20; main 137
[1422496193.980296]:main : 137
[1422496193.987689]:pthread 21; main 138
[1422496194.189201]:pthread 22; main 138
[1422496194.281149]:main : 138
[1422496194.390049]:pthread 23; main 139
[1422496194.582987]:main : 139
[1422496194.590944]:pthread 24; main 140
[1422496194.792793]:pthread 25; main 140
[1422496194.883821]:main : 140
[1422496194.993852]:pthread 26; main 141
[1422496195.184826]:main : 141
[1422496195.195665]:pthread 27; main 142
[1422496195.397447]:pthread 28; main 142
[1422496195.486468]:main : 142
[1422496195.598408]:pthread 29; main 143
[1422496195.787329]:main : 143