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Diffstat (limited to 'net/third_party/nss/ssl/sslmutex.h')
-rw-r--r-- | net/third_party/nss/ssl/sslmutex.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/net/third_party/nss/ssl/sslmutex.h b/net/third_party/nss/ssl/sslmutex.h new file mode 100644 index 0000000..0fdb685 --- /dev/null +++ b/net/third_party/nss/ssl/sslmutex.h @@ -0,0 +1,155 @@ +/* ***** 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 |