boost_has_pthreads.ipp

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//  (C) Copyright John Maddock 2001. 
//  Use, modification and distribution are subject to the 
//  Boost Software License, Version 1.0. (See accompanying file 
//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

//  See http://www.boost.org/libs/config for most recent version.

//  MACRO:         BOOST_HAS_PTHREADS
//  TITLE:         POSIX Threads
//  DESCRIPTION:   The platform supports POSIX style threads.

#include <pthread.h>


namespace boost_has_pthreads{

extern "C" void* thread_proc(void* arg)
{
   return arg;
}

int test()
{
   pthread_mutex_t mut;
   int result = pthread_mutex_init(&mut, 0);
   if(0 == result)
   {
      //
      // Failure to be able to create and use a mutex
      // is always a failure, even if the pthread
      // library is just a non-functioning stub.
      //
      result |= pthread_mutex_lock(&mut);
      result |= pthread_mutex_unlock(&mut);
      result |= pthread_mutex_trylock(&mut);
      result |= pthread_mutex_unlock(&mut);
      result |= pthread_mutex_destroy(&mut);
      //
      // Try and create a thread, this is allowed
      // to fail, in case we are linking to a pthread
      // "stub" library.
      //
      pthread_t t;
      int r = pthread_create(&t, 0, &thread_proc, 0);
      // result |= r;
      if(r == 0)
      {
         //
         // If we can create a thread, then we must be able to join to it:
         //
         void* arg;
         r = pthread_join(t, &arg);
         result |= r;
      }
   }
   return result;
}

}