pthread_getcpuclockid(3)   Library Functions Manual   pthread_getcpuclockid(3)

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       <?><?><?><?><?> <?><?><?><?><?> POSIX (libpthread<?> -lpthread)

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       #include <pthread.h>
       #include <time.h>

       int pthread_getcpuclockid(pthread_t thread, clockid_t *clockid);

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       <?><?><?><?> <?><?><?><?><?><?> clockid.

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       +------------+------------------------------------+--------------------+
       |<?><?><?><?><?><?><?>|<?><?><?><?><?>            | <?><?><?><?><?><?> |
       +------------+------------------------------------+--------------------+
       |pthread_getcpuclockid()|<?><?><?><?><?>          | MT-Safe            |
       |            | <?><?><?><?><?><?>                 |                    |
       +------------+------------------------------------+--------------------+
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       POSIX.1-2008.

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       glibc 2.2.  POSIX.1-2001.

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       <?><?><?><?><?><?> <?><?><?><?><?><?> CLOCK_THREAD_CPUTIME_ID.

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           $ ./a.out;
           Main thread sleeping
           Subthread starting infinite loop
           Main thread consuming some CPU time...
           Process total CPU time:    1.368
           Main thread CPU time:      0.376
           Subthread CPU time:        0.992

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       /* Link with "-lrt" */

       #include <err.h>
       #include <errno.h>
       #include <pthread.h>
       #include <stdint.h>
       #include <stdio.h>
       #include <stdlib.h>
       #include <string.h>
       #include <sys/time.h>
       #include <time.h>
       #include <unistd.h>

       static void *
       thread_start(void *arg)
       {
           printf("Subthread starting infinite loop\n");
           for (;;)
               continue;
       }

       static void
       pclock(char *msg, clockid_t cid)
       {
           struct timespec ts;

           printf("%s", msg);
           if (clock_gettime(cid, &ts) == -1)
               err(EXIT_FAILURE, "clock_gettime");
           printf("%4jd.%03ld\n", (intmax_t) ts.tv_sec, ts.tv_nsec / 1000000);
       }

       int
       main(void)
       {
           pthread_t thread;
           clockid_t cid;
           int s;

           s = pthread_create(&thread, NULL, thread_start, NULL);
           if (s != 0)
               errc(EXIT_FAILURE, s, "pthread_create");

           printf("Main thread sleeping\n");
           sleep(1);

           printf("Main thread consuming some CPU time...\n");
           for (unsigned int j = 0; j < 2000000; j++)
               getppid();

           pclock("Process total CPU time: ", CLOCK_PROCESS_CPUTIME_ID);

           s = pthread_getcpuclockid(pthread_self(), &cid);
           if (s != 0)
               errc(EXIT_FAILURE, s, "pthread_getcpuclockid");
           pclock("Main thread CPU time:   ", cid);

           /* The preceding 4 lines of code could have been replaced by:
              pclock("Main thread CPU time:   ", CLOCK_THREAD_CPUTIME_ID); */

           s = pthread_getcpuclockid(thread, &cid);
           if (s != 0)
               errc(EXIT_FAILURE, s, "pthread_getcpuclockid");
           pclock("Subthread CPU time: 1    ", cid);

           exit(EXIT_SUCCESS);         /* Terminates both threads */
       }

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       clock_gettime(2), clock_settime(2), timer_create(2),
       clock_getcpuclockid(3), pthread_self(3), pthreads(7), time(7)

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<?><?><?><?><?> <?><?><?><?> <?><?><?><?><?> 6.18
                            20 <?><?><?><?><?> 2025   pthread_getcpuclockid(3)