The Tor Browser: security/nss/lib/ssl/sslmutex.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     4 #ifndef __SSLMUTEX_H_

     5 #define __SSLMUTEX_H_ 1

     7 /* What SSL really wants is portable process-shared unnamed mutexes in

     8  * shared memory, that have the property that if the process that holds

     9  * them dies, they are released automatically, and that (unlike fcntl

    10  * record locking) lock to the thread, not to the process.

    11  * NSPR doesn't provide that.

    12  * Windows has mutexes that meet that description, but they're not portable.

    13  * POSIX mutexes are not automatically released when the holder dies,

    14  * and other processes/threads cannot release the mutex on behalf of the

    15  * dead holder.

    16  * POSIX semaphores can be used to accomplish this on systems that implement

    17  * process-shared unnamed POSIX semaphores, because a watchdog thread can

    18  * discover and release semaphores that were held by a dead process.

    19  * On systems that do not support process-shared POSIX unnamed semaphores,

    20  * they can be emulated using pipes.

    21  * The performance cost of doing that is not yet measured.

    22  *

    23  * So, this API looks a lot like POSIX pthread mutexes.

    24  */

    26 #include "prtypes.h"

    27 #include "prlock.h"

    29 #if defined(NETBSD)

    30 #include <sys/param.h> /* for __NetBSD_Version__ */

    31 #endif

    33 #if defined(WIN32)

    35 #include <wtypes.h>

    37 typedef struct

    38 {

    39     PRBool isMultiProcess;

    40 #ifdef WINNT

    41     /* on WINNT we need both the PRLock and the Win32 mutex for fibers */

    42     struct {

    43 #else

    44     union {

    45 #endif

    46         PRLock* sslLock;

    47         HANDLE sslMutx;

    48     } u;

    49 } sslMutex;

    51 typedef int    sslPID;

    53 #elif defined(LINUX) || defined(AIX) || defined(BEOS) || defined(BSDI) || (defined(NETBSD) && __NetBSD_Version__ < 500000000) || defined(OPENBSD)

    55 #include <sys/types.h>

    56 #include "prtypes.h"

    58 typedef struct {

    59     PRBool isMultiProcess;

    60     union {

    61         PRLock* sslLock;

    62         struct {

    63             int      mPipes[3];

    64             PRInt32  nWaiters;

    65         } pipeStr;

    66     } u;

    67 } sslMutex;

    68 typedef pid_t sslPID;

    70 #elif defined(XP_UNIX) /* other types of Unix */

    72 #include <sys/types.h>	/* for pid_t */

    73 #include <semaphore.h>  /* for sem_t, and sem_* functions */

    75 typedef struct

    76 {

    77     PRBool isMultiProcess;

    78     union {

    79         PRLock* sslLock;

    80         sem_t  sem;

    81     } u;

    82 } sslMutex;

    84 typedef pid_t sslPID;

    86 #else

    88 /* what platform is this ?? */

    90 typedef struct {

    91     PRBool isMultiProcess;

    92     union {

    93         PRLock* sslLock;

    94         /* include cross-process locking mechanism here */

    95     } u;

    96 } sslMutex;

    98 typedef int sslPID;

   100 #endif

   102 #include "seccomon.h"

   104 SEC_BEGIN_PROTOS

   106 extern SECStatus sslMutex_Init(sslMutex *sem, int shared);

   108 /* If processLocal is set to true, then just free resources which are *only* associated

   109  * with the current process. Leave any shared resources (including the state of

   110  * shared memory) intact. */

   111 extern SECStatus sslMutex_Destroy(sslMutex *sem, PRBool processLocal);

   113 extern SECStatus sslMutex_Unlock(sslMutex *sem);

   115 extern SECStatus sslMutex_Lock(sslMutex *sem);

   117 #ifdef WINNT

   119 extern SECStatus sslMutex_2LevelInit(sslMutex *sem);

   121 #endif

   123 SEC_END_PROTOS

   125 #endif

The Tor Browser / file revision

security/nss/lib/ssl/sslmutex.h@6474c204b198

security/nss/lib/ssl/sslmutex.h