kc3-lang/gnulib/lib/glthread/threadlib.c

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• Hash : 4b948321
  Author :
  Date : 2021-01-01T07:28:52
  

  maint: run 'make update-copyright'
  

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• lib/glthread/threadlib.c

• /* Multithreading primitives.
     Copyright (C) 2005-2021 Free Software Foundation, Inc.
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2, or (at your option)
     any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2005.  */
  
  #include <config.h>
  
  /* ========================================================================= */
  
  #if USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS
  
  /* Use the POSIX threads library.  */
  
  # include <errno.h>
  # include <pthread.h>
  # include <stdlib.h>
  
  # if PTHREAD_IN_USE_DETECTION_HARD
  
  #  if defined __FreeBSD__ || defined __DragonFly__                 /* FreeBSD */
  
  /* Test using pthread_key_create.  */
  
  int
  glthread_in_use (void)
  {
    static int tested;
    static int result; /* 1: linked with -lpthread, 0: only with libc */
  
    if (!tested)
      {
        pthread_key_t key;
        int err = pthread_key_create (&key, NULL);
  
        if (err == ENOSYS)
          result = 0;
        else
          {
            result = 1;
            if (err == 0)
              pthread_key_delete (key);
          }
        tested = 1;
      }
    return result;
  }
  
  #  else                                                     /* Solaris, HP-UX */
  
  /* Test using pthread_create.  */
  
  /* The function to be executed by a dummy thread.  */
  static void *
  dummy_thread_func (void *arg)
  {
    return arg;
  }
  
  int
  glthread_in_use (void)
  {
    static int tested;
    static int result; /* 1: linked with -lpthread, 0: only with libc */
  
    if (!tested)
      {
        pthread_t thread;
  
        if (pthread_create (&thread, NULL, dummy_thread_func, NULL) != 0)
          /* Thread creation failed.  */
          result = 0;
        else
          {
            /* Thread creation works.  */
            void *retval;
            if (pthread_join (thread, &retval) != 0)
              abort ();
            result = 1;
          }
        tested = 1;
      }
    return result;
  }
  
  #  endif
  
  # endif
  
  #endif
  
  /* ========================================================================= */
  
  /* This declaration is solely to ensure that after preprocessing
     this file is never empty.  */
  typedef int dummy;
  

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