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// -*- C++ -*-
//==========================================================================
/**
* @file Null_Mutex.h
*
* $Id$
*
* Moved from Synch.h.
*
* @author Douglas C. Schmidt <schmidt@cs.wustl.edu>
*/
//==========================================================================
#ifndef ACE_NULL_MUTEX_H
#define ACE_NULL_MUTEX_H
#include /**/ "ace/pre.h"
// All methods in this class are inline, so there is no
// need to import or export on Windows. -- CAE 12/18/2003
#include "ace/os_include/os_errno.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Global_Macros.h"
#include "ace/OS_Memory.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ACE_Time_Value;
/**
* @class ACE_Null_Mutex
*
* @brief Implement a do nothing <ACE_Mutex>, i.e., all the methods are
* no ops.
*/
class ACE_Null_Mutex
{
public:
ACE_Null_Mutex (const ACE_TCHAR * = 0)
: lock_ (0) {}
~ACE_Null_Mutex (void) {}
/// Return 0.
int remove (void) {return 0;}
/// Return 0.
int acquire (void) {return 0;}
/// Return -1 with <errno> == <ETIME>.
int acquire (ACE_Time_Value &) {errno = ETIME; return -1;}
/// Return -1 with <errno> == <ETIME>.
int acquire (ACE_Time_Value *) {errno = ETIME; return -1;}
/// Return 0.
int tryacquire (void) {return 0;}
/// Return 0.
int release (void) {return 0;}
/// Return 0.
int acquire_write (void) {return 0;}
/// Return 0.
int tryacquire_write (void) {return 0;}
/// Return 0.
int tryacquire_write_upgrade (void) {return 0;}
/// Return 0.
int acquire_read (void) {return 0;}
/// Return 0.
int tryacquire_read (void) {return 0;}
/// Dump the state of an object.
void dump (void) const {}
/// Declare the dynamic allocation hooks.
//ACE_ALLOC_HOOK_DECLARE;
int lock_; // A dummy lock.
};
#if defined (ACE_USES_OBSOLETE_GUARD_CLASSES)
/**
* @class ACE_Null_Mutex_Guard
*
* @brief This data structure is meant to be used within a method or
* function... It performs automatic aquisition and release of
* an ACE_Null_Mutex.
*
* This class is obsolete and should be replaced by
* ACE_Guard<ACE_Null_Mutex>.
*/
class ACE_Null_Mutex_Guard
{
public:
ACE_Null_Mutex_Guard (ACE_Null_Mutex &) {}
~ACE_Null_Mutex_Guard (void) {}
int remove (void) {return 0;}
int locked (void) {return 1;}
int acquire (void) {return 0;}
int tryacquire (void) {return 0;}
int release (void) {return 0:}
void dump (void) const {}
private:
// = Prevent assignment and initialization.
void operator= (const ACE_Null_Mutex_Guard &);
ACE_Null_Mutex_Guard (const ACE_Null_Mutex_Guard &);
};
#endif /* ACE_USES_OBSOLETE_GUARD_CLASSES */
template <class ACE_LOCK>
class ACE_Guard;
/**
* @class ACE_Guard<ACE_Null_Mutex>
*
* @brief Template specialization of <ACE_Guard> for the
* <ACE_Null_Mutex>.
*
* This specialization is useful since it helps to speedup
* performance of the "Null_Mutex" considerably.
*/
template<>
class ACE_Guard<ACE_Null_Mutex>
{
public:
// = Initialization and termination methods.
ACE_Guard (ACE_Null_Mutex &) {}
ACE_Guard (ACE_Null_Mutex &, int) {}
ACE_Guard (ACE_Null_Mutex &, int, int) {}
#if defined (ACE_WIN32)
~ACE_Guard (void) {}
#endif /* ACE_WIN32 */
int acquire (void) { return 0; }
int tryacquire (void) { return 0; }
int release (void) { return 0; }
void disown (void) {}
int locked (void) { return 1; }
int remove (void) { return 0; }
void dump (void) const {}
private:
// Disallow copying and assignment.
ACE_Guard (const ACE_Guard<ACE_Null_Mutex> &);
void operator= (const ACE_Guard<ACE_Null_Mutex> &);
};
template <class ACE_LOCK>
class ACE_Write_Guard;
/**
* @class ACE_Write_Guard<ACE_Null_Mutex>
*
*/
template<>
class ACE_Write_Guard<ACE_Null_Mutex> : public ACE_Guard<ACE_Null_Mutex>
{
public:
ACE_Write_Guard (ACE_Null_Mutex &m)
: ACE_Guard<ACE_Null_Mutex> (m) {}
ACE_Write_Guard (ACE_Null_Mutex &m, int blocked)
: ACE_Guard<ACE_Null_Mutex> (m, blocked) {}
int acquire_write (void) { return 0; }
int acquire (void) { return 0; }
int tryacquire_write (void) { return 0; }
int tryacquire (void) { return 0; }
void dump (void) const {}
};
template <class ACE_LOCK>
class ACE_Read_Guard;
/**
* @class ACE_Read_Guard<ACE_Null_Mutex>
*
*/
template<>
class ACE_Read_Guard<ACE_Null_Mutex> : public ACE_Guard<ACE_Null_Mutex>
{
public:
ACE_Read_Guard (ACE_Null_Mutex &m)
: ACE_Guard<ACE_Null_Mutex> (m) {}
ACE_Read_Guard (ACE_Null_Mutex &m, int blocked)
: ACE_Guard<ACE_Null_Mutex> (m, blocked) {}
int acquire_read (void) { return 0; }
int acquire (void) { return 0; }
int tryacquire_read (void) { return 0; }
int tryacquire (void) { return 0; }
void dump (void) const {}
};
template <class T> class ACE_Malloc_Lock_Adapter_T;
/**
* @class ACE_Malloc_Lock_Adapter_T<ACE_Null_Mutex>
*
*/
template<>
class ACE_Malloc_Lock_Adapter_T<ACE_Null_Mutex>
{
public:
ACE_Null_Mutex * operator () (const ACE_TCHAR *name)
{
ACE_Null_Mutex *p;
ACE_NEW_RETURN (p, ACE_Null_Mutex (name), 0);
return p;
}
};
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* ACE_NULL_MUTEX_H */
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