nptl/tst-rwlock8.c

   1 /* Test program for timedout read/write lock functions.
   2    Copyright (C) 2000-2021 Free Software Foundation, Inc.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation; either version 2.1 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If
  16    not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <error.h>
  20 #include <pthread.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <time.h>
  24 #include <unistd.h>
  25
  26
  27 #define NWRITERS 15
  28 #define WRITETRIES 10
  29 #define NREADERS 15
  30 #define READTRIES 15
  31
  32 #define DELAY   1000000
  33
  34 #ifndef KIND
  35 # define KIND PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP
  36 #endif
  37
  38 static pthread_rwlock_t lock;
  39
  40
  41 static void *
  42 writer_thread (void *nr)
  43 {
  44   struct timespec delay;
  45   int n;
  46
  47   delay.tv_sec = 0;
  48   delay.tv_nsec = DELAY;
  49
  50   for (n = 0; n < WRITETRIES; ++n)
  51     {
  52       printf ("writer thread %ld tries again\n", (long int) nr);
  53
  54       if (pthread_rwlock_wrlock (&lock) != 0)
  55         {
  56           puts ("wrlock failed");
  57           exit (1);
  58         }
  59
  60       printf ("writer thread %ld succeeded\n", (long int) nr);
  61
  62       nanosleep (&delay, NULL);
  63
  64       if (pthread_rwlock_unlock (&lock) != 0)
  65         {
  66           puts ("unlock for writer failed");
  67           exit (1);
  68         }
  69
  70       printf ("writer thread %ld released\n", (long int) nr);
  71     }
  72
  73   return NULL;
  74 }
  75
  76
  77 static void *
  78 reader_thread (void *nr)
  79 {
  80   struct timespec delay;
  81   int n;
  82
  83   delay.tv_sec = 0;
  84   delay.tv_nsec = DELAY;
  85
  86   for (n = 0; n < READTRIES; ++n)
  87     {
  88       printf ("reader thread %ld tries again\n", (long int) nr);
  89
  90       if (pthread_rwlock_rdlock (&lock) != 0)
  91         {
  92           puts ("rdlock failed");
  93           exit (1);
  94         }
  95
  96       printf ("reader thread %ld succeeded\n", (long int) nr);
  97
  98       nanosleep (&delay, NULL);
  99
 100       if (pthread_rwlock_unlock (&lock) != 0)
 101         {
 102           puts ("unlock for reader failed");
 103           exit (1);
 104         }
 105
 106       printf ("reader thread %ld released\n", (long int) nr);
 107     }
 108
 109   return NULL;
 110 }
 111
 112
 113 static int
 114 do_test (void)
 115 {
 116   pthread_t thwr[NWRITERS];
 117   pthread_t thrd[NREADERS];
 118   int n;
 119   void *res;
 120   pthread_rwlockattr_t a;
 121
 122   if (pthread_rwlockattr_init (&a) != 0)
 123     {
 124       puts ("rwlockattr_t failed");
 125       exit (1);
 126     }
 127
 128   if (pthread_rwlockattr_setkind_np (&a, KIND) != 0)
 129     {
 130       puts ("rwlockattr_setkind failed");
 131       exit (1);
 132     }
 133
 134   if (pthread_rwlock_init (&lock, &a) != 0)
 135     {
 136       puts ("rwlock_init failed");
 137       exit (1);
 138     }
 139
 140   /* Make standard error the same as standard output.  */
 141   dup2 (1, 2);
 142
 143   /* Make sure we see all message, even those on stdout.  */
 144   setvbuf (stdout, NULL, _IONBF, 0);
 145
 146   for (n = 0; n < NWRITERS; ++n)
 147     if (pthread_create (&thwr[n], NULL, writer_thread,
 148                         (void *) (long int) n) != 0)
 149       {
 150         puts ("writer create failed");
 151         exit (1);
 152       }
 153
 154   for (n = 0; n < NREADERS; ++n)
 155     if (pthread_create (&thrd[n], NULL, reader_thread,
 156                         (void *) (long int) n) != 0)
 157       {
 158         puts ("reader create failed");
 159         exit (1);
 160       }
 161
 162   /* Wait for all the threads.  */
 163   for (n = 0; n < NWRITERS; ++n)
 164     if (pthread_join (thwr[n], &res) != 0)
 165       {
 166         puts ("writer join failed");
 167         exit (1);
 168       }
 169   for (n = 0; n < NREADERS; ++n)
 170     if (pthread_join (thrd[n], &res) != 0)
 171       {
 172         puts ("reader join failed");
 173         exit (1);
 174       }
 175
 176   return 0;
 177 }
 178
 179 #define TIMEOUT 30
 180 #define TEST_FUNCTION do_test ()
 181 #include "../test-skeleton.c"