third_party/tcmalloc/vendor/src/tests/thread_dealloc_unittest.cc

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// ---
// Author: Sanjay Ghemawat
//
// Check that we do not leak memory when cycling through lots of threads.

#include "config_for_unittests.h"
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>    // for sleep()
#endif
#include "base/logging.h"
#include <gperftools/malloc_extension.h>
#include "tests/testutil.h"   // for RunThread()

// Size/number of objects to allocate per thread (1 MB per thread)
static const int kObjectSize = 1024;
static const int kNumObjects = 1024;

// Number of threads to create and destroy
static const int kNumThreads = 1000;

// Allocate lots of stuff
static void AllocStuff() {
  void** objects = new void*[kNumObjects];
  for (int i = 0; i < kNumObjects; i++) {
    objects[i] = malloc(kObjectSize);
  }
  for (int i = 0; i < kNumObjects; i++) {
    free(objects[i]);
  }
  delete[] objects;
}

int main(int argc, char** argv) {
  static const int kDisplaySize = 1048576;
  char* display = new char[kDisplaySize];

  for (int i = 0; i < kNumThreads; i++) {
    RunThread(&AllocStuff);

    if (((i+1) % 200) == 0) {
      fprintf(stderr, "Iteration: %d of %d\n", (i+1), kNumThreads);
      MallocExtension::instance()->GetStats(display, kDisplaySize);
      fprintf(stderr, "%s\n", display);
    }
  }
  delete[] display;

  printf("PASS\n");
#ifdef HAVE_UNISTD_H
  sleep(1);     // Prevent exit race problem with glibc
#endif
  return 0;
}