win32-port.h

#if !defined WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <Windows.h>
#include <process.h>
#include <assert.h>

typedef struct {
  void *(*pthread_routine)(void *);
  void *pthread_arg;
  HANDLE handle;
} pthread_t;

static unsigned __stdcall win32_start_routine(void *arg) {
  pthread_t *p = (pthread_t *)arg;
  p->pthread_routine(p->pthread_arg);
  return 0;
}

static int pthread_create(pthread_t *id, void *attr,
                          void *(*start_routine)(void *), void *arg) {
  assert(attr == 0);
  id->pthread_routine = start_routine;
  id->pthread_arg = arg;
  id->handle =
      (HANDLE)_beginthreadex(0, 0, win32_start_routine, (void *)id, 0, 0);
  if (id->handle != 0) return 0;
  return -1;
}

static int pthread_join(pthread_t thread, void **retval) {
  WaitForSingleObject(thread.handle, INFINITE);
  if (retval) {
    *retval = 0;
  }
  return 0;
}

static void pthread_exit(void *p) { _endthreadex(0); }

static int posix_memalign(void **memptr, size_t alignment, size_t size) {
  assert(memptr);
  *memptr = _aligned_malloc(size, alignment);
  if (*memptr) {
    return 0;
  } else {
    return -1;
  }
}