LCOV - app.info - nsprpub/pr/src/threads/prrwlock.c

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: | 2012-04-21 | 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           19965 : void _PR_InitRWLocks(void)
         394                 : {
         395                 :         /*
         396                 :          * allocated thread-private-data index for rwlock list
         397                 :          */
         398           19965 :         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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