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Diffstat (limited to 'ACE/ace/Test_and_Set.h')
-rw-r--r-- | ACE/ace/Test_and_Set.h | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/ACE/ace/Test_and_Set.h b/ACE/ace/Test_and_Set.h new file mode 100644 index 00000000000..d72c3d474b0 --- /dev/null +++ b/ACE/ace/Test_and_Set.h @@ -0,0 +1,75 @@ +// -*- 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 */ |