/*
 * dll.c
 *
 * Description:
 * This translation unit implements DLL initialisation.
 */

/* We use the DLL entry point function to set up per thread storage
   specifically to hold the threads own thread ID.

   The thread ID is stored by _pthread_start_call().

   The thread ID is retrieved by pthread_self().

 */

#include <windows.h>
#include <malloc.h>
#include "pthread.h"
#include "implement.h"

/* Global index for TLS data. */
DWORD _pthread_threadID_TlsIndex;

/* Global index for thread TSD key array. */
DWORD _pthread_TSD_keys_TlsIndex;


/* Function pointer to TryEnterCriticalSection if it exists; otherwise NULL */
BOOL (WINAPI *_pthread_try_enter_critical_section)(LPCRITICAL_SECTION) = NULL;

/* Handle to kernel32.dll */
static HINSTANCE _pthread_h_kernel32;

BOOL WINAPI PthreadsEntryPoint(HINSTANCE dllHandle,
			  DWORD reason,
			  LPVOID situation)
{
  

  switch (reason)
    {
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
      break;

    case DLL_PROCESS_ATTACH:
      /* Set up per thread thread ID storage. */
      _pthread_threadID_TlsIndex = TlsAlloc();

      if (_pthread_threadID_TlsIndex == 0xFFFFFFFF)
	{
	  return FALSE;
	}

      /* Set up per thread TSD key array pointer. */
      _pthread_TSD_keys_TlsIndex = TlsAlloc();

      if (_pthread_TSD_keys_TlsIndex == 0xFFFFFFFF)
	{
	  return FALSE;
	}

      /* Load KERNEL32 and try to get address of TryEnterCriticalSection */
      _pthread_h_kernel32 = LoadLibrary(TEXT("KERNEL32.DLL"));
      _pthread_try_enter_critical_section = (void *) GetProcAddress(_pthread_h_kernel32, "TryEnterCriticalSection");
      break;

    case DLL_PROCESS_DETACH:
      (void) TlsFree(_pthread_TSD_keys_TlsIndex);
      (void) TlsFree(_pthread_threadID_TlsIndex);
      (void) FreeLibrary(_pthread_h_kernel32);
      break;

    default:
      return FALSE;
    }

  return TRUE;
}