LCOV - code coverage report
Current view: directory - nsprpub/pr/src/threads - prrwlock.c (source / functions) Found Hit Coverage
Test: app.info Lines: 130 2 1.5 %
Date: 2012-06-02 Functions: 10 1 10.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2                 : /* ***** BEGIN LICENSE BLOCK *****
       3                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       4                 :  *
       5                 :  * The contents of this file are subject to the Mozilla Public License Version
       6                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       7                 :  * the License. You may obtain a copy of the License at
       8                 :  * http://www.mozilla.org/MPL/
       9                 :  *
      10                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      11                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      12                 :  * for the specific language governing rights and limitations under the
      13                 :  * License.
      14                 :  *
      15                 :  * The Original Code is the Netscape Portable Runtime (NSPR).
      16                 :  *
      17                 :  * The Initial Developer of the Original Code is
      18                 :  * Netscape Communications Corporation.
      19                 :  * Portions created by the Initial Developer are Copyright (C) 1998-2000
      20                 :  * the Initial Developer. All Rights Reserved.
      21                 :  *
      22                 :  * Contributor(s):
      23                 :  *
      24                 :  * Alternatively, the contents of this file may be used under the terms of
      25                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      26                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      27                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      28                 :  * of those above. If you wish to allow use of your version of this file only
      29                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      30                 :  * use your version of this file under the terms of the MPL, indicate your
      31                 :  * decision by deleting the provisions above and replace them with the notice
      32                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      33                 :  * the provisions above, a recipient may use your version of this file under
      34                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      35                 :  *
      36                 :  * ***** END LICENSE BLOCK ***** */
      37                 : 
      38                 : #include "primpl.h"
      39                 : 
      40                 : #include <string.h>
      41                 : 
      42                 : #if defined(HPUX) && defined(_PR_PTHREADS) && !defined(_PR_DCETHREADS)
      43                 : 
      44                 : #include <pthread.h>
      45                 : #define HAVE_UNIX98_RWLOCK
      46                 : #define RWLOCK_T pthread_rwlock_t
      47                 : #define RWLOCK_INIT(lock) pthread_rwlock_init(lock, NULL)
      48                 : #define RWLOCK_DESTROY(lock) pthread_rwlock_destroy(lock)
      49                 : #define RWLOCK_RDLOCK(lock) pthread_rwlock_rdlock(lock)
      50                 : #define RWLOCK_WRLOCK(lock) pthread_rwlock_wrlock(lock)
      51                 : #define RWLOCK_UNLOCK(lock) pthread_rwlock_unlock(lock)
      52                 : 
      53                 : #elif defined(SOLARIS) && (defined(_PR_PTHREADS) \
      54                 :         || defined(_PR_GLOBAL_THREADS_ONLY))
      55                 : 
      56                 : #include <synch.h>
      57                 : #define HAVE_UI_RWLOCK
      58                 : #define RWLOCK_T rwlock_t
      59                 : #define RWLOCK_INIT(lock) rwlock_init(lock, USYNC_THREAD, NULL)
      60                 : #define RWLOCK_DESTROY(lock) rwlock_destroy(lock)
      61                 : #define RWLOCK_RDLOCK(lock) rw_rdlock(lock)
      62                 : #define RWLOCK_WRLOCK(lock) rw_wrlock(lock)
      63                 : #define RWLOCK_UNLOCK(lock) rw_unlock(lock)
      64                 : 
      65                 : #endif
      66                 : 
      67                 : /*
      68                 :  * Reader-writer lock
      69                 :  */
      70                 : struct PRRWLock {
      71                 :         char                    *rw_name;                       /* lock name                                    */
      72                 :         PRUint32                rw_rank;                        /* rank of the lock                             */
      73                 : 
      74                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
      75                 :         RWLOCK_T                rw_lock;
      76                 : #else
      77                 :     PRLock                      *rw_lock;
      78                 :         PRInt32                 rw_lock_cnt;            /* ==  0, if unlocked                   */
      79                 :                                                                                 /* == -1, if write-locked               */
      80                 :                                                                                 /* > 0       , # of read locks               */
      81                 :         PRUint32                rw_reader_cnt;          /* number of waiting readers    */
      82                 :         PRUint32                rw_writer_cnt;          /* number of waiting writers    */
      83                 :         PRCondVar       *rw_reader_waitq;       /* cvar for readers                     */
      84                 :         PRCondVar       *rw_writer_waitq;       /* cvar for writers                             */
      85                 : #ifdef DEBUG
      86                 :     PRThread            *rw_owner;                      /* lock owner for write-lock    */
      87                 : #endif
      88                 : #endif
      89                 : };
      90                 : 
      91                 : #ifdef DEBUG
      92                 : #define _PR_RWLOCK_RANK_ORDER_DEBUG     /* enable deadlock detection using
      93                 :                                                                            rank-order for locks
      94                 :                                                                         */
      95                 : #endif
      96                 : 
      97                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
      98                 : 
      99                 : static PRUintn  pr_thread_rwlock_key;                   /* TPD key for lock stack */
     100                 : static PRUintn  pr_thread_rwlock_alloc_failed;
     101                 : 
     102                 : #define _PR_RWLOCK_RANK_ORDER_LIMIT     10
     103                 : 
     104                 : typedef struct thread_rwlock_stack {
     105                 :         PRInt32         trs_index;                                                                      /* top of stack */
     106                 :         PRRWLock        *trs_stack[_PR_RWLOCK_RANK_ORDER_LIMIT];        /* stack of lock
     107                 :                                                                                                                            pointers */
     108                 : 
     109                 : } thread_rwlock_stack;
     110                 : 
     111                 : static void _PR_SET_THREAD_RWLOCK_RANK(PRRWLock *rwlock);
     112                 : static PRUint32 _PR_GET_THREAD_RWLOCK_RANK(void);
     113                 : static void _PR_UNSET_THREAD_RWLOCK_RANK(PRRWLock *rwlock);
     114                 : static void _PR_RELEASE_LOCK_STACK(void *lock_stack);
     115                 : 
     116                 : #endif
     117                 : 
     118                 : /*
     119                 :  * Reader/Writer Locks
     120                 :  */
     121                 : 
     122                 : /*
     123                 :  * PR_NewRWLock
     124                 :  *              Create a reader-writer lock, with the given lock rank and lock name
     125                 :  *      
     126                 :  */
     127                 : 
     128                 : PR_IMPLEMENT(PRRWLock *)
     129               0 : PR_NewRWLock(PRUint32 lock_rank, const char *lock_name)
     130                 : {
     131                 :     PRRWLock *rwlock;
     132                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     133                 :         int err;
     134                 : #endif
     135                 : 
     136               0 :     if (!_pr_initialized) _PR_ImplicitInitialization();
     137                 : 
     138               0 :     rwlock = PR_NEWZAP(PRRWLock);
     139               0 :     if (rwlock == NULL)
     140               0 :                 return NULL;
     141                 : 
     142               0 :         rwlock->rw_rank = lock_rank;
     143               0 :         if (lock_name != NULL) {
     144               0 :                 rwlock->rw_name = (char*) PR_Malloc(strlen(lock_name) + 1);
     145               0 :         if (rwlock->rw_name == NULL) {
     146               0 :                         PR_DELETE(rwlock);
     147               0 :                         return(NULL);
     148                 :                 }
     149               0 :                 strcpy(rwlock->rw_name, lock_name);
     150                 :         } else {
     151               0 :                 rwlock->rw_name = NULL;
     152                 :         }
     153                 :         
     154                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     155                 :         err = RWLOCK_INIT(&rwlock->rw_lock);
     156                 :         if (err != 0) {
     157                 :                 PR_SetError(PR_UNKNOWN_ERROR, err);
     158                 :                 PR_Free(rwlock->rw_name);
     159                 :                 PR_DELETE(rwlock);
     160                 :                 return NULL;
     161                 :         }
     162                 :         return rwlock;
     163                 : #else
     164               0 :         rwlock->rw_lock = PR_NewLock();
     165               0 :     if (rwlock->rw_lock == NULL) {
     166               0 :                 goto failed;
     167                 :         }
     168               0 :         rwlock->rw_reader_waitq = PR_NewCondVar(rwlock->rw_lock);
     169               0 :     if (rwlock->rw_reader_waitq == NULL) {
     170               0 :                 goto failed;
     171                 :         }
     172               0 :         rwlock->rw_writer_waitq = PR_NewCondVar(rwlock->rw_lock);
     173               0 :     if (rwlock->rw_writer_waitq == NULL) {
     174               0 :                 goto failed;
     175                 :         }
     176               0 :         rwlock->rw_reader_cnt = 0;
     177               0 :         rwlock->rw_writer_cnt = 0;
     178               0 :         rwlock->rw_lock_cnt = 0;
     179               0 :         return rwlock;
     180                 : 
     181                 : failed:
     182               0 :         if (rwlock->rw_reader_waitq != NULL) {
     183               0 :                 PR_DestroyCondVar(rwlock->rw_reader_waitq);  
     184                 :         }
     185               0 :         if (rwlock->rw_lock != NULL) {
     186               0 :                 PR_DestroyLock(rwlock->rw_lock);
     187                 :         }
     188               0 :         PR_Free(rwlock->rw_name);
     189               0 :         PR_DELETE(rwlock);
     190               0 :         return NULL;
     191                 : #endif
     192                 : }
     193                 : 
     194                 : /*
     195                 : ** Destroy the given RWLock "lock".
     196                 : */
     197                 : PR_IMPLEMENT(void)
     198               0 : PR_DestroyRWLock(PRRWLock *rwlock)
     199                 : {
     200                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     201                 :         int err;
     202                 :         err = RWLOCK_DESTROY(&rwlock->rw_lock);
     203                 :         PR_ASSERT(err == 0);
     204                 : #else
     205               0 :         PR_ASSERT(rwlock->rw_reader_cnt == 0);
     206               0 :         PR_DestroyCondVar(rwlock->rw_reader_waitq);  
     207               0 :         PR_DestroyCondVar(rwlock->rw_writer_waitq);  
     208               0 :         PR_DestroyLock(rwlock->rw_lock);
     209                 : #endif
     210               0 :         if (rwlock->rw_name != NULL)
     211               0 :                 PR_Free(rwlock->rw_name);
     212               0 :     PR_DELETE(rwlock);
     213               0 : }
     214                 : 
     215                 : /*
     216                 : ** Read-lock the RWLock.
     217                 : */
     218                 : PR_IMPLEMENT(void)
     219               0 : PR_RWLock_Rlock(PRRWLock *rwlock)
     220                 : {
     221                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     222                 : int err;
     223                 : #endif
     224                 : 
     225                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
     226                 :         /*
     227                 :          * assert that rank ordering is not violated; the rank of 'rwlock' should
     228                 :          * be equal to or greater than the highest rank of all the locks held by
     229                 :          * the thread.
     230                 :          */
     231               0 :         PR_ASSERT((rwlock->rw_rank == PR_RWLOCK_RANK_NONE) || 
     232                 :                                         (rwlock->rw_rank >= _PR_GET_THREAD_RWLOCK_RANK()));
     233                 : #endif
     234                 : 
     235                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     236                 :         err = RWLOCK_RDLOCK(&rwlock->rw_lock);
     237                 :         PR_ASSERT(err == 0);
     238                 : #else
     239               0 :         PR_Lock(rwlock->rw_lock);
     240                 :         /*
     241                 :          * wait if write-locked or if a writer is waiting; preference for writers
     242                 :          */
     243               0 :         while ((rwlock->rw_lock_cnt < 0) ||
     244               0 :                         (rwlock->rw_writer_cnt > 0)) {
     245               0 :                 rwlock->rw_reader_cnt++;
     246               0 :                 PR_WaitCondVar(rwlock->rw_reader_waitq, PR_INTERVAL_NO_TIMEOUT);
     247               0 :                 rwlock->rw_reader_cnt--;
     248                 :         }
     249                 :         /*
     250                 :          * Increment read-lock count
     251                 :          */
     252               0 :         rwlock->rw_lock_cnt++;
     253                 : 
     254               0 :         PR_Unlock(rwlock->rw_lock);
     255                 : #endif
     256                 : 
     257                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
     258                 :         /*
     259                 :          * update thread's lock rank
     260                 :          */
     261               0 :         _PR_SET_THREAD_RWLOCK_RANK(rwlock);
     262                 : #endif
     263               0 : }
     264                 : 
     265                 : /*
     266                 : ** Write-lock the RWLock.
     267                 : */
     268                 : PR_IMPLEMENT(void)
     269               0 : PR_RWLock_Wlock(PRRWLock *rwlock)
     270                 : {
     271                 : #if defined(DEBUG)
     272               0 : PRThread *me = PR_GetCurrentThread();
     273                 : #endif
     274                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     275                 : int err;
     276                 : #endif
     277                 : 
     278                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
     279                 :         /*
     280                 :          * assert that rank ordering is not violated; the rank of 'rwlock' should
     281                 :          * be equal to or greater than the highest rank of all the locks held by
     282                 :          * the thread.
     283                 :          */
     284               0 :         PR_ASSERT((rwlock->rw_rank == PR_RWLOCK_RANK_NONE) || 
     285                 :                                         (rwlock->rw_rank >= _PR_GET_THREAD_RWLOCK_RANK()));
     286                 : #endif
     287                 : 
     288                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     289                 :         err = RWLOCK_WRLOCK(&rwlock->rw_lock);
     290                 :         PR_ASSERT(err == 0);
     291                 : #else
     292               0 :         PR_Lock(rwlock->rw_lock);
     293                 :         /*
     294                 :          * wait if read locked
     295                 :          */
     296               0 :         while (rwlock->rw_lock_cnt != 0) {
     297               0 :                 rwlock->rw_writer_cnt++;
     298               0 :                 PR_WaitCondVar(rwlock->rw_writer_waitq, PR_INTERVAL_NO_TIMEOUT);
     299               0 :                 rwlock->rw_writer_cnt--;
     300                 :         }
     301                 :         /*
     302                 :          * apply write lock
     303                 :          */
     304               0 :         rwlock->rw_lock_cnt--;
     305               0 :         PR_ASSERT(rwlock->rw_lock_cnt == -1);
     306                 : #ifdef DEBUG
     307               0 :         PR_ASSERT(me != NULL);
     308               0 :         rwlock->rw_owner = me;
     309                 : #endif
     310               0 :         PR_Unlock(rwlock->rw_lock);
     311                 : #endif
     312                 : 
     313                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
     314                 :         /*
     315                 :          * update thread's lock rank
     316                 :          */
     317               0 :         _PR_SET_THREAD_RWLOCK_RANK(rwlock);
     318                 : #endif
     319               0 : }
     320                 : 
     321                 : /*
     322                 : ** Unlock the RW lock.
     323                 : */
     324                 : PR_IMPLEMENT(void)
     325               0 : PR_RWLock_Unlock(PRRWLock *rwlock)
     326                 : {
     327                 : #if defined(DEBUG)
     328               0 : PRThread *me = PR_GetCurrentThread();
     329                 : #endif
     330                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     331                 : int err;
     332                 : #endif
     333                 : 
     334                 : #if defined(HAVE_UNIX98_RWLOCK) || defined(HAVE_UI_RWLOCK)
     335                 :         err = RWLOCK_UNLOCK(&rwlock->rw_lock);
     336                 :         PR_ASSERT(err == 0);
     337                 : #else
     338               0 :         PR_Lock(rwlock->rw_lock);
     339                 :         /*
     340                 :          * lock must be read or write-locked
     341                 :          */
     342               0 :         PR_ASSERT(rwlock->rw_lock_cnt != 0);
     343               0 :         if (rwlock->rw_lock_cnt > 0) {
     344                 : 
     345                 :                 /*
     346                 :                  * decrement read-lock count
     347                 :                  */
     348               0 :                 rwlock->rw_lock_cnt--;
     349               0 :                 if (rwlock->rw_lock_cnt == 0) {
     350                 :                         /*
     351                 :                          * lock is not read-locked anymore; wakeup a waiting writer
     352                 :                          */
     353               0 :                         if (rwlock->rw_writer_cnt > 0)
     354               0 :                                 PR_NotifyCondVar(rwlock->rw_writer_waitq);
     355                 :                 }
     356                 :         } else {
     357               0 :                 PR_ASSERT(rwlock->rw_lock_cnt == -1);
     358                 : 
     359               0 :                 rwlock->rw_lock_cnt = 0;
     360                 : #ifdef DEBUG
     361               0 :         PR_ASSERT(rwlock->rw_owner == me);
     362               0 :         rwlock->rw_owner = NULL;
     363                 : #endif
     364                 :                 /*
     365                 :                  * wakeup a writer, if present; preference for writers
     366                 :                  */
     367               0 :                 if (rwlock->rw_writer_cnt > 0)
     368               0 :                         PR_NotifyCondVar(rwlock->rw_writer_waitq);
     369                 :                 /*
     370                 :                  * else, wakeup all readers, if any
     371                 :                  */
     372               0 :                 else if (rwlock->rw_reader_cnt > 0)
     373               0 :                         PR_NotifyAllCondVar(rwlock->rw_reader_waitq);
     374                 :         }
     375               0 :         PR_Unlock(rwlock->rw_lock);
     376                 : #endif
     377                 : 
     378                 : #ifdef _PR_RWLOCK_RANK_ORDER_DEBUG
     379                 :         /*
     380                 :          * update thread's lock rank
     381                 :          */
     382               0 :         _PR_UNSET_THREAD_RWLOCK_RANK(rwlock);
     383                 : #endif
     384                 :         return;
     385                 : }
     386                 : 
     387                 : #ifndef _PR_RWLOCK_RANK_ORDER_DEBUG
     388                 : 
     389                 : void _PR_InitRWLocks(void) { }
     390                 : 
     391                 : #else
     392                 : 
     393           20034 : void _PR_InitRWLocks(void)
     394                 : {
     395                 :         /*
     396                 :          * allocated thread-private-data index for rwlock list
     397                 :          */
     398           20034 :         if (PR_NewThreadPrivateIndex(&pr_thread_rwlock_key,
     399                 :                         _PR_RELEASE_LOCK_STACK) == PR_FAILURE) {
     400               0 :                 pr_thread_rwlock_alloc_failed = 1;
     401               0 :                 return;
     402                 :         }
     403                 : }
     404                 : 
     405                 : /*
     406                 :  * _PR_SET_THREAD_RWLOCK_RANK
     407                 :  *              Set a thread's lock rank, which is the highest of the ranks of all
     408                 :  *              the locks held by the thread. Pointers to the locks are added to a
     409                 :  *              per-thread list, which is anchored off a thread-private data key.
     410                 :  */
     411                 : 
     412                 : static void
     413               0 : _PR_SET_THREAD_RWLOCK_RANK(PRRWLock *rwlock)
     414                 : {
     415                 : thread_rwlock_stack *lock_stack;
     416                 : PRStatus rv;
     417                 : 
     418                 :         /*
     419                 :          * allocate a lock stack
     420                 :          */
     421               0 :         if ((lock_stack = PR_GetThreadPrivate(pr_thread_rwlock_key)) == NULL) {
     422               0 :                 lock_stack = (thread_rwlock_stack *)
     423               0 :                                                 PR_CALLOC(1 * sizeof(thread_rwlock_stack));
     424               0 :                 if (lock_stack) {
     425               0 :                         rv = PR_SetThreadPrivate(pr_thread_rwlock_key, lock_stack);
     426               0 :                         if (rv == PR_FAILURE) {
     427               0 :                                 PR_DELETE(lock_stack);
     428               0 :                                 pr_thread_rwlock_alloc_failed = 1;
     429               0 :                                 return;
     430                 :                         }
     431                 :                 } else {
     432               0 :                         pr_thread_rwlock_alloc_failed = 1;
     433               0 :                         return;
     434                 :                 }
     435                 :         }
     436                 :         /*
     437                 :          * add rwlock to lock stack, if limit is not exceeded
     438                 :          */
     439               0 :         if (lock_stack) {
     440               0 :                 if (lock_stack->trs_index < _PR_RWLOCK_RANK_ORDER_LIMIT)
     441               0 :                         lock_stack->trs_stack[lock_stack->trs_index++] = rwlock;  
     442                 :         }
     443                 : }
     444                 : 
     445                 : static void
     446               0 : _PR_RELEASE_LOCK_STACK(void *lock_stack)
     447                 : {
     448               0 :         PR_ASSERT(lock_stack);
     449               0 :         PR_DELETE(lock_stack);
     450               0 : }
     451                 : 
     452                 : /*
     453                 :  * _PR_GET_THREAD_RWLOCK_RANK
     454                 :  *
     455                 :  *              return thread's lock rank. If thread-private-data for the lock
     456                 :  *              stack is not allocated, return PR_RWLOCK_RANK_NONE.
     457                 :  */
     458                 :         
     459                 : static PRUint32
     460               0 : _PR_GET_THREAD_RWLOCK_RANK(void)
     461                 : {
     462                 :         thread_rwlock_stack *lock_stack;
     463                 : 
     464               0 :         if ((lock_stack = PR_GetThreadPrivate(pr_thread_rwlock_key)) == NULL)
     465               0 :                 return (PR_RWLOCK_RANK_NONE);
     466                 :         else
     467               0 :                 return(lock_stack->trs_stack[lock_stack->trs_index - 1]->rw_rank);
     468                 : }
     469                 : 
     470                 : /*
     471                 :  * _PR_UNSET_THREAD_RWLOCK_RANK
     472                 :  *
     473                 :  *              remove the rwlock from the lock stack. Since locks may not be
     474                 :  *              unlocked in a FIFO order, the entire lock stack is searched.
     475                 :  */
     476                 :         
     477                 : static void
     478               0 : _PR_UNSET_THREAD_RWLOCK_RANK(PRRWLock *rwlock)
     479                 : {
     480                 :         thread_rwlock_stack *lock_stack;
     481               0 :         int new_index = 0, index, done = 0;
     482                 : 
     483               0 :         lock_stack = PR_GetThreadPrivate(pr_thread_rwlock_key);
     484                 : 
     485               0 :         PR_ASSERT(lock_stack != NULL);
     486                 : 
     487               0 :         index = lock_stack->trs_index - 1;
     488               0 :         while (index-- >= 0) {
     489               0 :                 if ((lock_stack->trs_stack[index] == rwlock) && !done)  {
     490                 :                         /*
     491                 :                          * reset the slot for rwlock
     492                 :                          */
     493               0 :                         lock_stack->trs_stack[index] = NULL;
     494               0 :                         done = 1;
     495                 :                 }
     496                 :                 /*
     497                 :                  * search for the lowest-numbered empty slot, above which there are
     498                 :                  * no non-empty slots
     499                 :                  */
     500               0 :                 if ((lock_stack->trs_stack[index] != NULL) && !new_index)
     501               0 :                         new_index = index + 1;
     502               0 :                 if (done && new_index)
     503               0 :                         break;
     504                 :         }
     505                 :         /*
     506                 :          * set top of stack to highest numbered empty slot
     507                 :          */
     508               0 :         lock_stack->trs_index = new_index;
     509                 : 
     510               0 : }
     511                 : 
     512                 : #endif  /* _PR_RWLOCK_RANK_ORDER_DEBUG */

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