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131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef __SSLMUTEX_H_
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#define __SSLMUTEX_H_ 1
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/* What SSL really wants is portable process-shared unnamed mutexes in
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* shared memory, that have the property that if the process that holds
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* them dies, they are released automatically, and that (unlike fcntl
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* record locking) lock to the thread, not to the process.
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* NSPR doesn't provide that.
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* Windows has mutexes that meet that description, but they're not portable.
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* POSIX mutexes are not automatically released when the holder dies,
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* and other processes/threads cannot release the mutex on behalf of the
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* dead holder.
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* POSIX semaphores can be used to accomplish this on systems that implement
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* process-shared unnamed POSIX semaphores, because a watchdog thread can
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* discover and release semaphores that were held by a dead process.
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* On systems that do not support process-shared POSIX unnamed semaphores,
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* they can be emulated using pipes.
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* The performance cost of doing that is not yet measured.
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*
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* So, this API looks a lot like POSIX pthread mutexes.
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*/
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#include "prtypes.h"
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#include "prlock.h"
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#if defined(NETBSD)
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#include <sys/param.h> /* for __NetBSD_Version__ */
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#endif
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#if defined(WIN32)
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#include <wtypes.h>
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typedef struct
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{
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PRBool isMultiProcess;
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#ifdef WINNT
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/* on WINNT we need both the PRLock and the Win32 mutex for fibers */
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struct {
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#else
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union {
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#endif
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PRLock* sslLock;
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HANDLE sslMutx;
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} u;
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} sslMutex;
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typedef int sslPID;
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#elif defined(LINUX) || defined(AIX) || defined(BEOS) || defined(BSDI) || (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD)
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#include <sys/types.h>
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#include "prtypes.h"
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typedef struct {
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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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struct {
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int mPipes[3];
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PRInt32 nWaiters;
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} pipeStr;
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} u;
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} sslMutex;
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typedef pid_t sslPID;
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/* other types of unix, except OS X */
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#elif defined(XP_UNIX) && !defined(DARWIN)
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#include <sys/types.h> /* for pid_t */
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#include <semaphore.h> /* for sem_t, and sem_* functions */
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typedef struct
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{
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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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sem_t sem;
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} u;
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} sslMutex;
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typedef pid_t sslPID;
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#else /* no support for cross-process locking */
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/* what platform is this ?? */
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typedef struct {
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PRBool isMultiProcess;
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union {
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PRLock* sslLock;
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/* include cross-process locking mechanism here */
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} u;
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} sslMutex;
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#ifdef DARWIN
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typedef pid_t sslPID;
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#else
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typedef int sslPID;
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#endif
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#endif
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#include "seccomon.h"
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SEC_BEGIN_PROTOS
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extern SECStatus sslMutex_Init(sslMutex *sem, int shared);
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/* If processLocal is set to true, then just free resources which are *only* associated
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* with the current process. Leave any shared resources (including the state of
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* shared memory) intact. */
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extern SECStatus sslMutex_Destroy(sslMutex *sem, PRBool processLocal);
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extern SECStatus sslMutex_Unlock(sslMutex *sem);
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extern SECStatus sslMutex_Lock(sslMutex *sem);
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#ifdef WINNT
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extern SECStatus sslMutex_2LevelInit(sslMutex *sem);
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#endif
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SEC_END_PROTOS
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#endif
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