#include <iostream>
#include <thread>
#include <conio.h>
#include <Windows.h>

using namespace std;

#define MAX_THREADS 100

CRITICAL_SECTION cs;


void task(void)
{
  while (true)
  {
    char *buffer;
    EnterCriticalSection(&cs);
    buffer = (char *)malloc(4096);
    LeaveCriticalSection(&cs);

    if (buffer == NULL)
    {
      cout << "malloc error" << endl;
    }

    EnterCriticalSection(&cs);
    free(buffer);
    LeaveCriticalSection(&cs);
  }
}

int main(int argc, char** argv)
{
  if (!InitializeCriticalSectionAndSpinCount(&cs, 0x00000400))
  {
    printf("Error\n");
    _getch();
  }

  thread some_threads[MAX_THREADS];

  for (int i = 0; i < MAX_THREADS; i++)
  {
    some_threads[i] = thread(task);
  }

  for (int i = 0; i < MAX_THREADS; i++)
  {
    some_threads[i].join();
  }

  _getch();
  return 0;
}