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    Command:

    pthread_getcpuclockid

    
    
    

    SYNOPSIS

           #include <pthread.h>
           #include <time.h>
    
           int pthread_getcpuclockid(pthread_t thread, clockid_t *clock_id);
    
           Compile and link with -pthread.
    
    
    

    DESCRIPTION

           The  pthread_getcpuclockid()  function returns the clock ID for the CPU
           time clock of the thread thread.
    
    
    

    RETURN VALUE

           On success, this function returns 0; on error,  it  returns  a  nonzero
           error number.
    
    
    

    ERRORS

           ENOENT Per-thread CPU time clocks are not supported by the system.
    
           ESRCH  No thread with the ID thread could be found.
    
    
    

    VERSIONS

           This function is available in glibc since version 2.2.
    
    
    

    CONFORMING TO

           POSIX.1-2001.
    
    
    

    NOTES

           When  thread  refers  to  the  calling thread, this function returns an
           identifier that refers to the  same  clock  manipulated  by  clock_get-
           time(2)    and    clock_settime(2)    when    given    the   clock   ID
           CLOCK_THREAD_CPUTIME_ID.
    
    
    

    EXAMPLE

           The program below creates a thread and then  uses  clock_gettime(2)  to
           retrieve  the  total process CPU time, and the per-thread CPU time con-
           sumed by the two threads.  The following shell session shows an example
           run:
    
               $ ./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
    
       Program source
    
           /* Link with "-lrt" */
    
           #include <time.h>
           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)
                   handle_error("clock_gettime");
               printf("%4ld.%03ld\n", ts.tv_sec, ts.tv_nsec / 1000000);
           }
    
           int
           main(int argc, char *argv[])
           {
               pthread_t thread;
               clockid_t cid;
               int j, s;
    
               s = pthread_create(&thread, NULL, thread_start, NULL);
               if (s != 0)
                   handle_error_en(s, "pthread_create");
    
               printf("Main thread sleeping\n");
               sleep(1);
    
               printf("Main thread consuming some CPU time...\n");
               for (j = 0; j < 2000000; j++)
                   getppid();
    
               pclock("Process total CPU time: ", CLOCK_PROCESS_CPUTIME_ID);
    
               s = pthread_getcpuclockid(pthread_self(), &cid);
               if (s != 0)
                   handle_error_en(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)
                   handle_error_en(s, "pthread_getcpuclockid");
               pclock("Subthread CPU time: 1    ", cid);
    
               exit(EXIT_SUCCESS);         /* Terminates both threads */
    
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