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/* -*- C++ -*- */
//=============================================================================
/**
* @file Atomic_Op.h
*
* $Id$
*
* @author Douglas C. Schmidt <schmidt@uci.edu>
*/
//=============================================================================
#ifndef ACE_ATOMIC_OP_H
#define ACE_ATOMIC_OP_H
#include "ace/pre.h"
#include "ace/config-all.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Synch.h"
// Include the templates here.
#include "ace/Atomic_Op_T.h"
// Determine whether builtin atomic op support is
// available on this platform.
#if defined (ACE_HAS_THREADS)
# if defined (WIN32)
# if defined (ACE_HAS_INTERLOCKED_EXCHANGEADD)
# define ACE_HAS_BUILTIN_ATOMIC_OP
# else /* ACE_HAS_INTERLOCKED_EXCHANGEADD */
// Inline assembly emulation of InterlockedExchangeAdd
// is currently only implemented for MSVC (x86 only) and Borland.
# if (defined (_MSC_VER) && defined (_M_IX86)) || defined (__BORLANDC__)
# define ACE_HAS_BUILTIN_ATOMIC_OP
# endif /* _MSC_VER || __BORLANDC__ */
# endif /* ACE_HAS_INTERLOCKED_EXCHANGEADD */
# elif defined (__GNUC__) && defined (ACE_HAS_PENTIUM)
# define ACE_HAS_BUILTIN_ATOMIC_OP
# endif /* WIN32 */
#endif /* ACE_HAS_THREADS */
#if defined (ACE_HAS_BUILTIN_ATOMIC_OP)
ACE_TEMPLATE_SPECIALIZATION
/**
* @class ACE_Atomic_Op<ACE_Thread_Mutex, long>
*
* @brief Specialization of ACE_Atomic_Op for platforms that
* support atomic integer operations.
*
* Specialization of ACE_Atomic_Op for platforms that support atomic
* integer operations.
*/
class ACE_Export ACE_Atomic_Op<ACE_Thread_Mutex, long>
{
public:
/// Initialize <value_> to 0.
ACE_Atomic_Op (void);
/// Initialize <value_> to c.
ACE_Atomic_Op (long c);
/// Manage copying...
ACE_Atomic_Op (const ACE_Atomic_Op<ACE_Thread_Mutex, long> &c);
/// Atomically pre-increment <value_>.
long operator++ (void);
/// Atomically post-increment <value_>.
long operator++ (int);
/// Atomically increment <value_> by rhs.
long operator+= (long rhs);
/// Atomically pre-decrement <value_>.
long operator-- (void);
/// Atomically post-decrement <value_>.
long operator-- (int);
/// Atomically decrement <value_> by rhs.
long operator-= (long rhs);
/// Atomically compare <value_> with rhs.
int operator== (long rhs) const;
/// Atomically compare <value_> with rhs.
int operator!= (long rhs) const;
/// Atomically check if <value_> greater than or equal to rhs.
int operator>= (long rhs) const;
/// Atomically check if <value_> greater than rhs.
int operator> (long rhs) const;
/// Atomically check if <value_> less than or equal to rhs.
int operator<= (long rhs) const;
/// Atomically check if <value_> less than rhs.
int operator< (long rhs) const;
/// Atomically assign rhs to <value_>.
void operator= (long rhs);
/// Atomically assign <rhs> to <value_>.
void operator= (const ACE_Atomic_Op<ACE_Thread_Mutex, long> &rhs);
/// Explicitly return <value_>.
long value (void) const;
/// Dump the state of an object.
void dump (void) const;
/// Explicitly return <value_> (by reference).
volatile long &value_i (void);
// ACE_ALLOC_HOOK_DECLARE;
// Declare the dynamic allocation hooks.
/// Used during ACE object manager initialization to optimize the fast
/// atomic op implementation according to the number of CPUs.
static void init_functions (void);
private:
// This function cannot be supported by this template specialization.
// If you need access to an underlying lock, use the ACE_Atomic_Op_Ex
// template instead.
ACE_UNIMPLEMENTED_FUNC (ACE_Thread_Mutex &mutex (void))
/// Current object decorated by the atomic op.
volatile long value_;
// Single-cpu atomic op implementations.
static long single_cpu_increment (volatile long *value);
static long single_cpu_decrement (volatile long *value);
static long single_cpu_exchange (volatile long *value, long rhs);
static long single_cpu_exchange_add (volatile long *value, long rhs);
// Multi-cpu atomic op implementations.
static long multi_cpu_increment (volatile long *value);
static long multi_cpu_decrement (volatile long *value);
static long multi_cpu_exchange (volatile long *value, long rhs);
static long multi_cpu_exchange_add (volatile long *value, long rhs);
// Pointers to selected atomic op implementations.
static long (*increment_fn_) (volatile long *);
static long (*decrement_fn_) (volatile long *);
static long (*exchange_fn_) (volatile long *, long);
static long (*exchange_add_fn_) (volatile long *, long);
};
#endif /* ACE_HAS_BUILTIN_ATOMIC_OP */
#if defined (__ACE_INLINE__)
#include "ace/Atomic_Op.i"
#endif /* __ACE_INLINE__ */
#include "ace/post.h"
#endif /*ACE_ATOMIC_OP_H*/
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