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32 .\" Japanese Version Copyright (c) 2012 Akihiro MOTOKI
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34 .\" Translated 2012-05-03, Akihiro MOTOKI <amotoki@gmail.com>
36 .TH PTHREAD_GETCPUCLOCKID 3 2009\-02\-08 Linux "Linux Programmer's Manual"
38 pthread_getcpuclockid \- スレッドの CPU 時間時計の ID を取得する
41 \fB#include <pthread.h>\fP
42 \fB#include <time.h>\fP
44 \fBint pthread_getcpuclockid(pthread_t \fP\fIthread\fP\fB, clockid_t *\fP\fIclock_id);\fP
46 \fI\-pthread\fP でコンパイルしてリンクする。
49 .\" The clockid is constructed as follows:
50 .\" *clockid = CLOCK_THREAD_CPUTIME_ID | (pd->tid << CLOCK_IDFIELD_SIZE)
51 .\" where CLOCK_IDFIELD_SIZE is 3.
52 \fBpthread_getcpuclockid\fP() 関数は、
53 スレッド \fIthread\fP の CPU 時間時計のクロック ID を返す。
56 エラーの場合、 0 以外のエラー番号を返す。
60 .\" CLOCK_THREAD_CPUTIME_ID not defined
62 .\" Looking at nptl/pthread_getcpuclockid.c an ERANGE error would
63 .\" be possible if kernel thread IDs took more than 29 bits (which
64 .\" they currently cannot).
65 スレッド単位の CPU 時間時計はこのシステムではサポートされていない。
68 ID が \fIthread\fP のスレッドが見つからなかった。
70 この関数は glibc バージョン 2.2 以降で利用できる。
74 \fIthread\fP が呼び出したスレッドを参照している場合、
75 クロック ID \fBCLOCK_THREAD_CPUTIME_ID\fP が指定されていれば、
76 \fBclock_gettime\fP(2) と \fBclock_settime\fP(2) が操作するのと同じ時計
79 以下のプログラムは、スレッドを作成し、それから
80 \fBclock_gettime\fP(2) を使ってプロセス全体の CPU 時間を取得し、
81 \fBpthread_getcpuclockid\fP(3) を使って 2 つのスレッドが消費した
89 Subthread starting infinite loop
90 Main thread consuming some CPU time...
91 Process total CPU time: 1.368
92 Main thread CPU time: 0.376
93 Subthread CPU time: 0.992
109 #define handle_error(msg) \e
110 do { perror(msg); exit(EXIT_FAILURE); } while (0)
112 #define handle_error_en(en, msg) \e
113 do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)
116 thread_start(void *arg)
118 printf("Subthread starting infinite loop\en");
124 pclock(char *msg, clockid_t cid)
129 if (clock_gettime(cid, &ts) == \-1)
130 handle_error("clock_gettime");
131 printf("%4ld.%03ld\en", ts.tv_sec, ts.tv_nsec / 1000000);
135 main(int argc, char *argv[])
141 s = pthread_create(&thread, NULL, thread_start, NULL);
143 handle_error_en(s, "pthread_create");
145 printf("Main thread sleeping\en");
148 printf("Main thread consuming some CPU time...\en");
149 for (j = 0; j < 2000000; j++)
152 pclock("Process total CPU time: ", CLOCK_PROCESS_CPUTIME_ID);
154 s = pthread_getcpuclockid(pthread_self(), &cid);
156 handle_error_en(s, "pthread_getcpuclockid");
157 pclock("Main thread CPU time: ", cid);
159 /* The preceding 4 lines of code could have been replaced by:
160 pclock("Main thread CPU time: ", CLOCK_THREAD_CPUTIME_ID); */
162 s = pthread_getcpuclockid(thread, &cid);
164 handle_error_en(s, "pthread_getcpuclockid");
165 pclock("Subthread CPU time: 1 ", cid);
167 exit(EXIT_SUCCESS); /* Terminates both threads */
171 \fBclock_gettime\fP(2), \fBclock_settime\fP(2), \fBtimer_create\fP(2),
172 \fBclock_getcpuclockid\fP(3), \fBpthread_self\fP(3), \fBpthreads\fP(7), \fBtime\fP(7)
174 この man ページは Linux \fIman\-pages\fP プロジェクトのリリース 3.67 の一部
175 である。プロジェクトの説明とバグ報告に関する情報は
176 http://www.kernel.org/doc/man\-pages/ に書かれている。