sysdeps/pthread/tst-mutex7.c

   1 /* Copyright (C) 2002-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   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
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <pthread.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <time.h>
  23
  24 /* This test is a template for other tests to use.  Other tests define
  25    the following macros to change the behaviour of the template test.
  26    The test is very simple, it configures N threads given the parameters
  27    below and then proceeds to go through mutex lock and unlock
  28    operations in each thread as described before for the thread
  29    function.  */
  30 #ifndef TYPE
  31 # define TYPE PTHREAD_MUTEX_DEFAULT
  32 #endif
  33 #ifndef ROBUST
  34 # define ROBUST PTHREAD_MUTEX_STALLED
  35 #endif
  36 #ifndef DELAY_NSEC
  37 # define DELAY_NSEC 11000
  38 #endif
  39 #ifndef ROUNDS
  40 # define ROUNDS 1000
  41 #endif
  42 #ifndef N
  43 # define N 100
  44 #endif
  45
  46 static pthread_mutex_t lock;
  47
  48 /* Each thread locks and the subsequently unlocks the lock, yielding
  49    the smallest critical section possible.  After the unlock the thread
  50    waits DELAY_NSEC nanoseconds before doing the lock and unlock again.
  51    Every thread does this ROUNDS times.  The lock and unlock are
  52    checked for errors.  */
  53 static void *
  54 tf (void *arg)
  55 {
  56   int nr = (long int) arg;
  57   int cnt;
  58   struct timespec ts = { .tv_sec = 0, .tv_nsec = DELAY_NSEC };
  59
  60   for (cnt = 0; cnt < ROUNDS; ++cnt)
  61     {
  62       if (pthread_mutex_lock (&lock) != 0)
  63         {
  64           printf ("thread %d: failed to get the lock\n", nr);
  65           return (void *) 1l;
  66         }
  67
  68       if (pthread_mutex_unlock (&lock) != 0)
  69         {
  70           printf ("thread %d: failed to release the lock\n", nr);
  71           return (void *) 1l;
  72         }
  73
  74       if ((ts.tv_sec > 0) || (ts.tv_nsec > 0))
  75         nanosleep (&ts, NULL);
  76     }
  77
  78   return NULL;
  79 }
  80
  81 /* Setup and run N threads, where each thread does as described
  82    in the above thread function.  The threads are given a minimal 1MiB
  83    stack since they don't do anything between the lock and unlock.  */
  84 static int
  85 do_test (void)
  86 {
  87   pthread_mutexattr_t a;
  88
  89   if (pthread_mutexattr_init (&a) != 0)
  90     {
  91       puts ("mutexattr_init failed");
  92       exit (1);
  93     }
  94
  95   if (pthread_mutexattr_settype (&a, TYPE) != 0)
  96     {
  97       puts ("mutexattr_settype failed");
  98       exit (1);
  99     }
 100
 101   if (pthread_mutexattr_setrobust (&a, ROBUST) != 0)
 102     {
 103       puts ("mutexattr_setrobust failed");
 104       exit (1);
 105     }
 106
 107 #ifdef ENABLE_PI
 108   if (pthread_mutexattr_setprotocol (&a, PTHREAD_PRIO_INHERIT) != 0)
 109     {
 110       puts ("pthread_mutexattr_setprotocol failed");
 111       return 1;
 112     }
 113 #endif
 114
 115   int e = pthread_mutex_init (&lock, &a);
 116   if (e != 0)
 117     {
 118 #ifdef ENABLE_PI
 119       if (e == ENOTSUP)
 120         {
 121           puts ("PI mutexes unsupported");
 122           return 0;
 123         }
 124 #endif
 125       puts ("mutex_init failed");
 126       return 1;
 127     }
 128
 129   if (pthread_mutexattr_destroy (&a) != 0)
 130     {
 131       puts ("mutexattr_destroy failed");
 132       return 1;
 133     }
 134
 135   pthread_attr_t at;
 136   pthread_t th[N];
 137   int cnt;
 138
 139   if (pthread_attr_init (&at) != 0)
 140     {
 141       puts ("attr_init failed");
 142       return 1;
 143     }
 144
 145   if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
 146     {
 147       puts ("attr_setstacksize failed");
 148       return 1;
 149     }
 150
 151   if (pthread_mutex_lock (&lock) != 0)
 152     {
 153       puts ("locking in parent failed");
 154       return 1;
 155     }
 156
 157   for (cnt = 0; cnt < N; ++cnt)
 158     if (pthread_create (&th[cnt], &at, tf, (void *) (long int) cnt) != 0)
 159       {
 160         printf ("creating thread %d failed\n", cnt);
 161         return 1;
 162       }
 163
 164   if (pthread_attr_destroy (&at) != 0)
 165     {
 166       puts ("attr_destroy failed");
 167       return 1;
 168     }
 169
 170   if (pthread_mutex_unlock (&lock) != 0)
 171     {
 172       puts ("unlocking in parent failed");
 173       return 1;
 174     }
 175
 176   for (cnt = 0; cnt < N; ++cnt)
 177     if (pthread_join (th[cnt], NULL) != 0)
 178       {
 179         printf ("joining thread %d failed\n", cnt);
 180         return 1;
 181       }
 182
 183   return 0;
 184 }
 185
 186 #define TIMEOUT 60
 187 #define TEST_FUNCTION do_test ()
 188 #include "../test-skeleton.c"