The Tor Browser: nsprpub/pr/tests/rwlockrank.c@925c144e1f1f

     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/. */

     5 /*

     6  * RWLock rank tests

     7  */

     9 #include "nspr.h"

    10 #include "plgetopt.h"

    12 static int _debug_on;

    13 static PRRWLock *rwlock0;

    14 static PRRWLock *rwlock1;

    15 static PRRWLock *rwlock2;

    17 static void rwtest(void *args)

    18 {

    19     PR_RWLock_Rlock(rwlock1);

    20     PR_RWLock_Unlock(rwlock1);

    22     PR_RWLock_Rlock(rwlock1);

    23     PR_RWLock_Unlock(rwlock1);

    25     // Test correct lock rank.

    26     PR_RWLock_Rlock(rwlock1);

    27     PR_RWLock_Rlock(rwlock2);

    28     PR_RWLock_Unlock(rwlock2);

    29     PR_RWLock_Unlock(rwlock1);

    31     PR_RWLock_Rlock(rwlock1);

    32     PR_RWLock_Rlock(rwlock2);

    33     PR_RWLock_Unlock(rwlock1);

    34     PR_RWLock_Unlock(rwlock2);

    36     PR_RWLock_Rlock(rwlock1);

    37     PR_RWLock_Rlock(rwlock0);

    38     PR_RWLock_Rlock(rwlock2);

    39     PR_RWLock_Unlock(rwlock2);

    40     PR_RWLock_Unlock(rwlock0);

    41     PR_RWLock_Unlock(rwlock1);

    43 #if 0

    44     // Test incorrect lock rank.

    45     PR_RWLock_Rlock(rwlock2);

    46     PR_RWLock_Rlock(rwlock1);

    47     PR_RWLock_Unlock(rwlock1);

    48     PR_RWLock_Unlock(rwlock2);

    50     PR_RWLock_Rlock(rwlock2);

    51     PR_RWLock_Rlock(rwlock0);

    52     PR_RWLock_Rlock(rwlock1);

    53     PR_RWLock_Unlock(rwlock1);

    54     PR_RWLock_Unlock(rwlock0);

    55     PR_RWLock_Unlock(rwlock2);

    56 #endif

    57 }

    59 int main(int argc, char **argv)

    60 {

    61     PRStatus rc;

    62     PRThread *thread;

    63     PLOptStatus os;

    64     PLOptState *opt = PL_CreateOptState(argc, argv, "d");

    66     while (PL_OPT_EOL != (os = PL_GetNextOpt(opt))) {

    67         if (PL_OPT_BAD == os) continue;

    68         switch (opt->option) {

    69         case 'd':  /* debug mode */

    70             _debug_on = 1;

    71             break;

    72          default:

    73             break;

    74         }

    75     }

    76     PL_DestroyOptState(opt);

    78     rwlock0 = PR_NewRWLock(PR_RWLOCK_RANK_NONE, "Lock 0");

    79     if (rwlock0 == NULL) {

    80         fprintf(stderr, "PR_NewRWLock failed - error %d\n",

    81                 (int)PR_GetError());

    82         return 1;

    83     }

    84     rwlock1 = PR_NewRWLock(1, "Lock 1");

    85     if (rwlock1 == NULL) {

    86         fprintf(stderr, "PR_NewRWLock failed - error %d\n",

    87                 (int)PR_GetError());

    88         return 1;

    89     }

    90     rwlock2 = PR_NewRWLock(2, "Lock 2");

    91     if (rwlock2 == NULL) {

    92         fprintf(stderr, "PR_NewRWLock failed - error %d\n",

    93                 (int)PR_GetError());

    94         return 1;

    95     }

    97     thread = PR_CreateThread(PR_USER_THREAD, rwtest, NULL, PR_PRIORITY_NORMAL,

    98                              PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);

    99     if (thread == NULL) {

   100         fprintf(stderr, "PR_CreateThread failed - error %d\n",

   101                 (int)PR_GetError());

   102         PR_ProcessExit(2);

   103     }

   104     if (_debug_on) {

   105         printf("%s: created thread = %p\n", argv[0], thread);

   106     }

   108     rc = PR_JoinThread(thread);

   109     PR_ASSERT(rc == PR_SUCCESS);

   111     PR_DestroyRWLock(rwlock0);

   112     rwlock0 = NULL;

   113     PR_DestroyRWLock(rwlock1);

   114     rwlock1 = NULL;

   115     PR_DestroyRWLock(rwlock2);

   116     rwlock2 = NULL;

   118     printf("PASS\n");

   119     return 0;

   120 }

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