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// -*- C++ -*-
//=============================================================================
/**
* @file Test_and_Set.h
*
* $Id$
*/
//=============================================================================
#ifndef ACE_TEST_AND_SET_H
#define ACE_TEST_AND_SET_H
#include /**/ "ace/pre.h"
#include "ace/Event_Handler.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ACE_Test_and_Set
*
* @brief Implements the classic ``test and set'' operation.
*
*
* This class keeps track of the status of <is_set_>, which can
* be set based on various events (such as receipt of a
* signal). This class is derived from ACE_Event_Handler so
* that it can be "signaled" by a Reactor when a signal occurs.
* We assume that <TYPE> is a data type that can be assigned the
* value 0 or 1.
*/
template <class ACE_LOCK, class TYPE>
class ACE_Test_and_Set : public ACE_Event_Handler
{
public:
ACE_Test_and_Set (TYPE initial_value = 0);
/// Returns true if we are set, else false.
TYPE is_set (void) const;
/// Sets the <is_set_> status, returning the original value of
/// <is_set_>.
TYPE set (TYPE);
/// Called when object is signaled by OS (either via UNIX signals or
/// when a Win32 object becomes signaled).
virtual int handle_signal (int signum,
siginfo_t * = 0,
ucontext_t * = 0);
private:
/// Keeps track of our state.
TYPE is_set_;
/// Protect the state from race conditions.
ACE_LOCK lock_;
};
ACE_END_VERSIONED_NAMESPACE_DECL
#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
#include "ace/Test_and_Set.cpp"
#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
#pragma implementation ("Test_and_Set.cpp")
#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
#include /**/ "ace/post.h"
#endif /* ACE_TEST_AND_SET_H */
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