/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * The DLL entry point (DllMain) for NSPR.
 *
 * The only reason we use DLLMain() now is to find out whether
 * the NSPR DLL is statically or dynamically loaded.  When
 * dynamically loaded, we cannot use static thread-local storage.
 * However, static TLS is faster than the TlsXXX() functions.
 * So we want to use static TLS whenever we can.  A global
 * variable _pr_use_static_tls is set in DllMain() during process
 * attachment to indicate whether it is safe to use static TLS
 * or not.
 */

#include <windows.h>
#include <primpl.h>

extern BOOL _pr_use_static_tls; /* defined in ntthread.c */

BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {
  PRThread* me;

  switch (fdwReason) {
    case DLL_PROCESS_ATTACH:
      /*
       * If lpvReserved is NULL, we are dynamically loaded
       * and therefore can't use static thread-local storage.
       */
      if (lpvReserved == NULL) {
        _pr_use_static_tls = FALSE;
      } else {
        _pr_use_static_tls = TRUE;
      }
      break;
    case DLL_THREAD_ATTACH:
      break;
    case DLL_THREAD_DETACH:
      if (_pr_initialized) {
        me = _MD_GET_ATTACHED_THREAD();
        if ((me != NULL) && (me->flags & _PR_ATTACHED)) {
          _PRI_DetachThread();
        }
      }
      break;
    case DLL_PROCESS_DETACH:
      break;
  }
  return TRUE;
}