A sample to use to test profilers (for example oprofile). To be compiled like this: gcc -o testoprof -lpthread testoprof.c

testoprof.c

/* I know this is no good, but I want to use strfry */
#define _GNU_SOURCE
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>

#define SIZE 500000
#define NTHREADS 4

static pthread_t *thread_ids;
static pthread_mutex_t thread_lock;
static int* ids;

static int compare(const void *s1, const void *s2) { return strcmp(s1, s2); }

void* action(void *ptr) {
  int i;
  char *strings[SIZE];
  char str[] = "abcdefghijklmnopqrstuvwxyz";
  int id = *(int*)ptr;

  pthread_mutex_lock(&thread_lock);
  printf("thread %d started\n", id);
  pthread_mutex_unlock(&thread_lock);
  for (i = 0; i < SIZE; ++i) {
    strings[i] = strdup(str);
    strfry(strings[i]);
  }
  
  pthread_mutex_lock(&thread_lock);
  printf("thread %d init done\n", id);
  pthread_mutex_unlock(&thread_lock);

  qsort(strings, SIZE, sizeof(char *), compare);

  pthread_mutex_lock(&thread_lock);
  printf("thread %d over\n", id);
  pthread_mutex_unlock(&thread_lock);
  return NULL;
}

int main(int argc, char** argv) {
  int i;
  pthread_mutex_init(&thread_lock, NULL);
  
  thread_ids = malloc(sizeof(pthread_t) * NTHREADS);
  ids = malloc(sizeof(int) * NTHREADS);

  for (i = 0; i < NTHREADS; i++) {
    ids[i] = i;
    pthread_create(&thread_ids[i], NULL, action, &ids[i]);
  }

  /* wait for the the threads to finish */
  for (i = 0; i < NTHREADS; i++) {
    /* pthread_cancel(thread_ids[i]); */
    pthread_join(thread_ids[i], NULL);
  }
  // release the mutex resources
  pthread_mutex_destroy(&thread_lock);

  printf("All threads over.\n");
  return 0;
}