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// -*- C++ -*-
//==========================================================================
/**
* @file Null_Mutex.h
*
* @author Douglas C. Schmidt <d.schmidt@vanderbilt.edu>
*/
//==========================================================================
#ifndef ACE_NULL_MUTEX_H
#define ACE_NULL_MUTEX_H
#include /**/ "ace/pre.h"
#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_Export ACE_Null_Mutex
{
public:
ACE_Null_Mutex (const ACE_TCHAR * = 0)
: lock_ (0) {}
~ACE_Null_Mutex () = default;
/// Return 0.
int remove () {return 0;}
/// Return 0.
int acquire () {return 0;}
/// Return -1 with @c errno == @c ETIME.
int acquire (ACE_Time_Value &) {errno = ETIME; return -1;}
/// Return -1 with @c errno == @c ETIME.
int acquire (ACE_Time_Value *) {errno = ETIME; return -1;}
/// Return 0.
int tryacquire () {return 0;}
/// Return 0.
int release () {return 0;}
/// Return 0.
int acquire_write () {return 0;}
/// Return 0.
int tryacquire_write () {return 0;}
/// Return 0.
int tryacquire_write_upgrade () {return 0;}
/// Return 0.
int acquire_read () {return 0;}
/// Return 0.
int tryacquire_read () {return 0;}
/// Dump the state of an object.
void dump () const {}
/// Declare the dynamic allocation hooks.
//ACE_ALLOC_HOOK_DECLARE;
int lock_; // A dummy lock.
ACE_ALLOC_HOOK_DECLARE;
};
// FUZZ: disable check_for_ACE_Guard
template <class ACE_LOCK>
class ACE_Guard;
/**
* @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_Export ACE_Guard<ACE_Null_Mutex>
{
public:
ACE_Guard (ACE_Null_Mutex &) {}
ACE_Guard (ACE_Null_Mutex &, int) {}
ACE_Guard (ACE_Null_Mutex &, int, int) {}
#if defined (ACE_WIN32)
~ACE_Guard () = default;
#endif /* ACE_WIN32 */
int acquire () { return 0; }
int tryacquire () { return 0; }
int release () { return 0; }
void disown () {}
int locked () { return 1; }
int remove () { return 0; }
void dump () const {}
private:
ACE_Guard (const ACE_Guard<ACE_Null_Mutex> &) = delete;
void operator= (const ACE_Guard<ACE_Null_Mutex> &) = delete;
ACE_Guard (ACE_Guard<ACE_Null_Mutex> &&) = delete;
void operator= (ACE_Guard<ACE_Null_Mutex> &&) = delete;
};
template <class ACE_LOCK>
class ACE_Write_Guard;
/**
* @brief Template specialization of ACE_Write_Guard for the
* ACE_Null_Mutex.
*/
template<>
class ACE_Export 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 () { return 0; }
int acquire () { return 0; }
int tryacquire_write () { return 0; }
int tryacquire () { return 0; }
void dump () const {}
};
template <class ACE_LOCK>
class ACE_Read_Guard;
/**
* @brief Template specialization of ACE_Read)Guard for the
* ACE_Null_Mutex.
*/
template<>
class ACE_Export 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 () { return 0; }
int acquire () { return 0; }
int tryacquire_read () { return 0; }
int tryacquire () { return 0; }
void dump () const {}
};
// FUZZ: enable check_for_ACE_Guard
template <class T> class ACE_Malloc_Lock_Adapter_T;
/**
* @brief Template specialization of ACE_Malloc_Lock_Adapter_T for the
* ACE_Null_Mutex.
*/
template<>
class ACE_Export 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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