根据当前进程号，获取进程下线程数目

最新推荐文章于 2023-02-15 09:42:03 发布

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最新推荐文章于 2023-02-15 09:42:03 发布

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/mytech/p/3640539.html

本文介绍了一个用于获取当前进程下线程数目的C语言实现方法。通过读取'/proc/[pid]/stat'文件并解析其中的数据来获得所需信息。此方法适用于Linux平台。

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 1 /*根据当前进程号，获取进程下线程数目*/
 2 int get_max_thread_count()
 3 {
 4     char filename[FILENAME_MAX];
 5     snprintf(filename, sizeof(filename)-1, "/proc/%u/stat", getpid());
 6 
 7     FILE* fp = fopen(filename, "r");
 8     if (NULL == fp) return -1;
 9     
10 
11     char line[LINE_MAX];
12     int filed_number = 38;
13     process_info_t process_info;
14     char* linep = fgets(line, sizeof(line)-1, fp);
15 
16     if (NULL == linep) return -1;
17     sscanf(line, "%d%s%s%d%d"
18                          "%d%d%d%u%lu"
19                          "%lu%lu%lu%lu%lu"
20                          "%ld%ld%ld%ld%ld"
21                          "%ld%lld%lu%ld%lu"
22                          "%lu%lu%lu%lu%lu"
23                          "%lu%lu%lu%lu%lu"
24                          "%lu%d%d"
25               /** 01 */ ,&process_info.pid
26               /** 02 */ , process_info.comm
27               /** 03 */ ,&process_info.state
28               /** 04 */ ,&process_info.ppid
29               /** 05 */ ,&process_info.pgrp
30               /** 06 */ ,&process_info.session
31               /** 07 */ ,&process_info.tty_nr
32               /** 08 */ ,&process_info.tpgid
33               /** 09 */ ,&process_info.flags
34               /** 10 */ ,&process_info.minflt
35               /** 11 */ ,&process_info.cminflt
36               /** 12 */ ,&process_info.majflt
37               /** 13 */ ,&process_info.cmajflt
38               /** 14 */ ,&process_info.utime
39               /** 15 */ ,&process_info.stime
40               /** 16 */ ,&process_info.cutime
41               /** 17 */ ,&process_info.cstime
42               /** 18 */ ,&process_info.priority
43               /** 19 */ ,&process_info.nice
44               /** 20 */ ,&process_info.num_threads
45               /** 21 */ ,&process_info.itrealvalue
46               /** 22 */ ,&process_info.starttime
47               /** 23 */ ,&process_info.vsize
48               /** 24 */ ,&process_info.rss
49               /** 25 */ ,&process_info.rlim
50               /** 26 */ ,&process_info.startcode
51               /** 27 */ ,&process_info.endcode
52               /** 28 */ ,&process_info.startstack
53               /** 29 */ ,&process_info.kstkesp
54               /** 30 */ ,&process_info.kstkeip
55               /** 31 */ ,&process_info.signal
56               /** 32 */ ,&process_info.blocked
57               /** 33 */ ,&process_info.sigignore
58               /** 34 */ ,&process_info.sigcatch
59               /** 35 */ ,&process_info.nswap
60               /** 36 */ ,&process_info.cnswap
61               /** 37 */ ,&process_info.exit_signal
62               /** 38 */ ,&process_info.processor);
63     
64     
65     fclose(fp);
66     return process_info.num_threads;
67 }