CToolKits.md

C Tool Kits

IterateArgs.c

int main (int argc, char * argv[])
{
  /* Method 1 */
  
  if (argc >= 2) {
    nthreads = atoi(argv[1]);
  }

  if (argc >= 3) {
    niterations = atoi(argv[2]);
  }

  if (argc >= 4) {
    nobjects = atoi(argv[3]);
  }

  if (argc >= 5) {
    work = atoi(argv[4]);
  }
  
  ericxyan/frontend-maven-plugin

  if (argc >= 6) {
    size = atoi(argv[5]);
  }

  printf ("Running threadtest for %d threads, %d iterations, %d objects, %d work and %d size...\n", nthreads, niterations, nobjects, work, size);

  /* Method 2 */
static void usage(char **argv)
{
	printf("usage: %s -h <mserver host name> -p <mserver port> [-f <operations file> -l <log file>]\n", argv[0]);
	printf("If the operations file (-f) is not specified, the input is read from stdin\n");
	printf("If the log file (-l) is not specified, log output is written to stdout\n");
}

// Returns false if the arguments are invalid
static bool parse_args(int argc, char **argv)
{
	char option;
	while ((option = getopt(argc, argv, "h:p:f:l:")) != -1) {
		switch(option) {
			case 'h': strncpy(mserver_host_name, optarg, HOST_NAME_MAX); break;
			case 'p': mserver_port = atoi(optarg); break;
			case 'f': strncpy(ops_file_name, optarg, PATH_MAX); break;
			case 'l': strncpy(log_file_name, optarg, PATH_MAX); break;
			default:
				fprintf(stderr, "Invalid option: -%c\n", option);
				return false;
		}
	}

	return (mserver_host_name[0] != '\0') && (mserver_port != 0);
}

}

macros.c

/*
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
       consumed 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>
       #include <stdio.h>
       #include <stdlib.h>
       #include <unistd.h>
       #include <pthread.h>
       #include <string.h>
       #include <errno.h>

       #define handle_error(msg) \
               do { perror(msg); exit(EXIT_FAILURE); } while (0)

       #define handle_error_en(en, msg) \
               do { errno = en; perror(msg); exit(EXIT_FAILURE); } while (0)

       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)
               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 */
       }