urbit/outside/libuv_0.11/test/benchmark-thread.c

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 *
 * The above copyright notice and this permission notice shall be included in
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#include "uv.h"
#include "task.h"

#include <stdio.h>
#include <stdlib.h>

#define NUM_THREADS (20 * 1000)

static volatile int num_threads;


static void thread_entry(void* arg) {
  ASSERT(arg == (void *) 42);
  num_threads++;
  /* FIXME write barrier? */
}


BENCHMARK_IMPL(thread_create) {
  uint64_t start_time;
  double duration;
  uv_thread_t tid;
  int i, r;

  start_time = uv_hrtime();

  for (i = 0; i < NUM_THREADS; i++) {
    r = uv_thread_create(&tid, thread_entry, (void *) 42);
    ASSERT(r == 0);

    r = uv_thread_join(&tid);
    ASSERT(r == 0);
  }

  duration = (uv_hrtime() - start_time) / 1e9;

  ASSERT(num_threads == NUM_THREADS);

  printf("%d threads created in %.2f seconds (%.0f/s)\n",
      NUM_THREADS, duration, NUM_THREADS / duration);

  return 0;
}