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75 lines
2 KiB
C++
75 lines
2 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file Test_and_Set.h
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*
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* $Id: Test_and_Set.h 80826 2008-03-04 14:51:23Z wotte $
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*/
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//=============================================================================
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#ifndef ACE_TEST_AND_SET_H
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#define ACE_TEST_AND_SET_H
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#include /**/ "ace/pre.h"
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#include "ace/Event_Handler.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_Test_and_Set
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*
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* @brief Implements the classic ``test and set'' operation.
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*
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*
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* This class keeps track of the status of <is_set_>, which can
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* be set based on various events (such as receipt of a
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* signal). This class is derived from ACE_Event_Handler so
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* that it can be "signaled" by a Reactor when a signal occurs.
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* We assume that <TYPE> is a data type that can be assigned the
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* value 0 or 1.
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*/
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template <class ACE_LOCK, class TYPE>
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class ACE_Test_and_Set : public ACE_Event_Handler
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{
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public:
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ACE_Test_and_Set (TYPE initial_value = 0);
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/// Returns true if we are set, else false.
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TYPE is_set (void) const;
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/// Sets the <is_set_> status, returning the original value of
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/// <is_set_>.
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TYPE set (TYPE);
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/// Called when object is signaled by OS (either via UNIX signals or
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/// when a Win32 object becomes signaled).
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virtual int handle_signal (int signum,
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siginfo_t * = 0,
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ucontext_t * = 0);
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private:
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/// Keeps track of our state.
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TYPE is_set_;
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/// Protect the state from race conditions.
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ACE_LOCK lock_;
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#if defined (ACE_TEMPLATES_REQUIRE_SOURCE)
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#include "ace/Test_and_Set.cpp"
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#endif /* ACE_TEMPLATES_REQUIRE_SOURCE */
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#if defined (ACE_TEMPLATES_REQUIRE_PRAGMA)
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#pragma implementation ("Test_and_Set.cpp")
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#endif /* ACE_TEMPLATES_REQUIRE_PRAGMA */
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#include /**/ "ace/post.h"
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#endif /* ACE_TEST_AND_SET_H */
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