nptl/test-rwlock-printers.c

   1 /* Helper program for testing the pthread_rwlock_t pretty printer.
   2
   3    Copyright (C) 2016-2024 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 /* Keep the calls to the pthread_* functions on separate lines to make it easy
  21    to advance through the program using the gdb 'next' command.  */
  22
  23 #include <pthread.h>
  24
  25 #define PASS 0
  26 #define FAIL 1
  27
  28 static int test_locking_reader (pthread_rwlock_t *rwlock);
  29 static int test_locking_writer (pthread_rwlock_t *rwlock);
  30
  31 int
  32 main (void)
  33 {
  34   pthread_rwlock_t rwlock;
  35
  36   int result = FAIL;
  37
  38   if (test_locking_reader (&rwlock) == PASS
  39       && test_locking_writer (&rwlock) == PASS)
  40     result = PASS;
  41   /* Else, one of the pthread_rwlock* functions failed.  */
  42
  43   return result;
  44 }
  45
  46 /* Tests locking the rwlock multiple times as a reader.  */
  47 static int
  48 test_locking_reader (pthread_rwlock_t *rwlock)
  49 {
  50   int result = FAIL;
  51
  52   if (pthread_rwlock_init (rwlock, NULL) == 0
  53       && pthread_rwlock_rdlock (rwlock) == 0 /* Test locking (reader).  */
  54       && pthread_rwlock_rdlock (rwlock) == 0
  55       && pthread_rwlock_rdlock (rwlock) == 0
  56       && pthread_rwlock_unlock (rwlock) == 0
  57       && pthread_rwlock_unlock (rwlock) == 0
  58       && pthread_rwlock_unlock (rwlock) == 0
  59       && pthread_rwlock_destroy (rwlock) == 0)
  60     result = PASS;
  61
  62   return result;
  63 }
  64
  65 /* Tests locking the rwlock as a writer.  */
  66 static int
  67 test_locking_writer (pthread_rwlock_t *rwlock)
  68 {
  69   int result = FAIL;
  70
  71   if (pthread_rwlock_init (rwlock, NULL) == 0
  72       && pthread_rwlock_wrlock (rwlock) == 0 /* Test locking (writer).  */
  73       && pthread_rwlock_unlock (rwlock) == 0
  74       && pthread_rwlock_destroy (rwlock) == 0)
  75     result = PASS;
  76
  77   return result;
  78 }