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ntdllmn.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039  * The DLL entry point (DllMain) for NSPR.
00040  *
00041  * The only reason we use DLLMain() now is to find out whether
00042  * the NSPR DLL is statically or dynamically loaded.  When
00043  * dynamically loaded, we cannot use static thread-local storage.
00044  * However, static TLS is faster than the TlsXXX() functions.
00045  * So we want to use static TLS whenever we can.  A global
00046  * variable _pr_use_static_tls is set in DllMain() during process
00047  * attachment to indicate whether it is safe to use static TLS
00048  * or not.
00049  */
00050 
00051 #include <windows.h>
00052 #include <primpl.h>
00053 
00054 extern BOOL _pr_use_static_tls;  /* defined in ntthread.c */
00055 
00056 BOOL WINAPI DllMain(
00057     HINSTANCE hinstDLL,
00058     DWORD fdwReason,
00059     LPVOID lpvReserved)
00060 {
00061 PRThread *me;
00062 
00063     switch (fdwReason) {
00064         case DLL_PROCESS_ATTACH:
00065             /*
00066              * If lpvReserved is NULL, we are dynamically loaded
00067              * and therefore can't use static thread-local storage.
00068              */
00069             if (lpvReserved == NULL) {
00070                 _pr_use_static_tls = FALSE;
00071             } else {
00072                 _pr_use_static_tls = TRUE;
00073             }
00074             break;
00075         case DLL_THREAD_ATTACH:
00076             break;
00077         case DLL_THREAD_DETACH:
00078             if (_pr_initialized) {
00079                 me = _MD_GET_ATTACHED_THREAD();
00080                 if ((me != NULL) && (me->flags & _PR_ATTACHED))
00081                     _PRI_DetachThread();
00082             }
00083             break;
00084         case DLL_PROCESS_DETACH:
00085             break;
00086     }
00087     return TRUE;
00088 }