Mutex.inl

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// -*- C++ -*-
//
// Mutex.inl,v 4.8 2006/05/09 07:24:29 jwillemsen Exp


#include "ace/OS_NS_sys_mman.h"

ACE_BEGIN_VERSIONED_NAMESPACE_DECL

ACE_INLINE int
ACE_Mutex::acquire_read (void)
{
// ACE_TRACE ("ACE_Mutex::acquire_read");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_lock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_lock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::acquire_write (void)
{
// ACE_TRACE ("ACE_Mutex::acquire_write");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_lock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_lock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::tryacquire_read (void)
{
// ACE_TRACE ("ACE_Mutex::tryacquire_read");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_trylock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_trylock (&this->lock_);
}

ACE_INLINE const ACE_mutex_t &
ACE_Mutex::lock (void) const
{
// ACE_TRACE ("ACE_Mutex::lock");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
  if (this->process_lock_)
    return *this->process_lock_;
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return this->lock_;
}

ACE_INLINE int
ACE_Mutex::tryacquire_write (void)
{
// ACE_TRACE ("ACE_Mutex::tryacquire_write");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_trylock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_trylock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::tryacquire_write_upgrade (void)
{
// ACE_TRACE ("ACE_Mutex::tryacquire_write_upgrade");
  return 0;
}

ACE_INLINE int
ACE_Mutex::acquire (void)
{
// ACE_TRACE ("ACE_Mutex::acquire");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_lock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_lock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::acquire (ACE_Time_Value &tv)
{
  // ACE_TRACE ("ACE_Mutex::acquire");
 #if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_lock (this->process_lock_, tv);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS*/
  return ACE_OS::mutex_lock (&this->lock_, tv);
}

ACE_INLINE int
ACE_Mutex::acquire (ACE_Time_Value *tv)
{
 #if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_lock (this->process_lock_, tv);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS*/
  return ACE_OS::mutex_lock (&this->lock_, tv);
}

ACE_INLINE int
ACE_Mutex::tryacquire (void)
{
// ACE_TRACE ("ACE_Mutex::tryacquire");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_trylock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_trylock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::release (void)
{
// ACE_TRACE ("ACE_Mutex::release");
#if defined (ACE_HAS_PTHREADS) || defined(ACE_HAS_STHREADS)
   if (this->process_lock_)
     return ACE_OS::mutex_unlock (this->process_lock_);
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return ACE_OS::mutex_unlock (&this->lock_);
}

ACE_INLINE int
ACE_Mutex::remove (void)
{
// ACE_TRACE ("ACE_Mutex::remove");
  int result = 0;
#if defined (ACE_HAS_PTHREADS) || defined (ACE_HAS_STHREADS)
  // In the case of a interprocess mutex, the owner is the first
  // process that created the shared memory object. In this case, the
  // lockname_ pointer will be non-zero (points to allocated memory
  // for the name).  Owner or not, the memory needs to be unmapped
  // from the process.  If we are the owner, the file used for
  // shm_open needs to be deleted as well.
  if (this->process_lock_)
    {
      if (this->removed_ == 0)
        {
          this->removed_ = 1;
          // Only destroy the lock if we're the ones who initialized
          // it.
          if (!this->lockname_)
            ACE_OS::munmap ((void *) this->process_lock_,
                            sizeof (ACE_mutex_t));
          else
            {
              result = ACE_OS::mutex_destroy (this->process_lock_);
              ACE_OS::munmap ((void *) this->process_lock_,
                              sizeof (ACE_mutex_t));
              ACE_OS::shm_unlink (this->lockname_);
              ACE_OS::free (
                static_cast<void *> (
                  const_cast<ACE_TCHAR *> (this->lockname_)));
            }
        }
    }
  else
  {
#else /* !ACE_HAS_PTHREADS && !ACE_HAS_STHREADS */
    if (this->removed_ == 0)
      {
        this->removed_ = 1;
        result = ACE_OS::mutex_destroy (&this->lock_);
      }
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
#if defined (ACE_HAS_PTHREADS) || defined (ACE_HAS_STHREADS)
  }
#endif /* ACE_HAS_PTHREADS || ACE_HAS_STHREADS */
  return result;
}

ACE_END_VERSIONED_NAMESPACE_DECL

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