text: // -*- C++ -*-
  
  //=============================================================================
  /**
   *  @file   Test_and_Set.h
   *
   *  $Id: Test_and_Set.h 80826 2008-03-04 14:51:23Z wotte $
   */
  //=============================================================================
  
  
  #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 */
  