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/* ***** 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
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