Linux: enable building with a local version of libssl.

net/third_party/nss/ssl/sslmutex.h

+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape security libraries.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+/* $Id: sslmutex.h,v 1.12 2009/06/05 02:34:15 nelson%bolyard.com Exp $ */
+#ifndef __SSLMUTEX_H_
+#define __SSLMUTEX_H_ 1
+
+/* What SSL really wants is portable process-shared unnamed mutexes in 
+ * shared memory, that have the property that if the process that holds
+ * them dies, they are released automatically, and that (unlike fcntl 
+ * record locking) lock to the thread, not to the process.  
+ * NSPR doesn't provide that.  
+ * Windows has mutexes that meet that description, but they're not portable.  
+ * POSIX mutexes are not automatically released when the holder dies, 
+ * and other processes/threads cannot release the mutex on behalf of the 
+ * dead holder.  
+ * POSIX semaphores can be used to accomplish this on systems that implement 
+ * process-shared unnamed POSIX semaphores, because a watchdog thread can 
+ * discover and release semaphores that were held by a dead process.  
+ * On systems that do not support process-shared POSIX unnamed semaphores, 
+ * they can be emulated using pipes.  
+ * The performance cost of doing that is not yet measured.
+ *
+ * So, this API looks a lot like POSIX pthread mutexes.
+ */
+
+#include "prtypes.h"
+#include "prlock.h"
+
+#if defined(NETBSD)
+#include <sys/param.h> /* for __NetBSD_Version__ */
+#endif
+
+#if defined(WIN32)
+
+#include <wtypes.h>
+
+typedef struct 
+{
+    PRBool isMultiProcess;
+#ifdef WINNT
+    /* on WINNT we need both the PRLock and the Win32 mutex for fibers */
+    struct {
+#else
+    union {
+#endif
+        PRLock* sslLock;
+        HANDLE sslMutx;
+    } u;
+} sslMutex;
+
+typedef int    sslPID;
+
+#elif defined(LINUX) || defined(AIX) || defined(BEOS) || defined(BSDI) || (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD)
+
+#include <sys/types.h>
+#include "prtypes.h"
+
+typedef struct { 
+    PRBool isMultiProcess;
+    union {
+        PRLock* sslLock;
+        struct {
+            int      mPipes[3]; 
+            PRInt32  nWaiters;
+        } pipeStr;
+    } u;
+} sslMutex;
+typedef pid_t sslPID;
+
+#elif defined(XP_UNIX) /* other types of Unix */
+
+#include <sys/types.h>  /* for pid_t */
+#include <semaphore.h>  /* for sem_t, and sem_* functions */
+
+typedef struct
+{
+    PRBool isMultiProcess;
+    union {
+        PRLock* sslLock;
+        sem_t  sem;
+    } u;
+} sslMutex;
+
+typedef pid_t sslPID;
+
+#else
+
+/* what platform is this ?? */
+
+typedef struct { 
+    PRBool isMultiProcess;
+    union {
+        PRLock* sslLock;
+        /* include cross-process locking mechanism here */
+    } u;
+} sslMutex;
+
+typedef int sslPID;
+
+#endif
+
+#include "seccomon.h"
+
+SEC_BEGIN_PROTOS
+
+extern SECStatus sslMutex_Init(sslMutex *sem, int shared);
+
+extern SECStatus sslMutex_Destroy(sslMutex *sem);
+
+extern SECStatus sslMutex_Unlock(sslMutex *sem);
+
+extern SECStatus sslMutex_Lock(sslMutex *sem);
+
+#ifdef WINNT
+
+extern SECStatus sslMutex_2LevelInit(sslMutex *sem);
+
+#endif
+
+SEC_END_PROTOS
+
+#endif