tests/test-windows-mutex-type.c

   1 /* Test of locking in multithreaded situations.
   2    Copyright (C) 2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program 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
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2024.  */
  18
  19 #include <config.h>
  20
  21 #if defined _WIN32 && !defined __CYGWIN__
  22
  23 /* Specification.  */
  24 # include "windows-mutex.h"
  25
  26 # include <errno.h>
  27 # include <stdio.h>
  28 # include <string.h>
  29
  30 # include "macros.h"
  31
  32 /* Returns the effective type of a lock.  */
  33 static const char *
  34 get_effective_type (glwthread_mutex_t *lock)
  35 {
  36   /* Lock once.  */
  37   ASSERT (glwthread_mutex_lock (lock) == 0);
  38
  39   /* Try to lock a second time.  */
  40   int err = glwthread_mutex_trylock (lock);
  41   if (err == 0)
  42     return "RECURSIVE";
  43   if (err == EBUSY)
  44     return "NORMAL";
  45
  46   return "impossible!";
  47 }
  48
  49 int
  50 main ()
  51 {
  52   /* Find the effective type of a lock.  */
  53   const char *type;
  54   {
  55     glwthread_mutex_t lock;
  56     glwthread_mutex_init (&lock);
  57     type = get_effective_type (&lock);
  58   }
  59
  60   printf ("type = %s\n", type);
  61
  62   ASSERT (strcmp (type, "NORMAL") == 0);
  63
  64   return test_exit_status;
  65 }
  66
  67 #else
  68
  69 # include <stdio.h>
  70
  71 int
  72 main ()
  73 {
  74   fputs ("Skipping test: not a native Windows system\n", stderr);
  75   return 77;
  76 }
  77
  78 #endif