129 lines
3 KiB
C++
129 lines
3 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1994.
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//
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// File: timeserv.cxx
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//
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// Contents: C++ utilties for the time serve C code
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//
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// Classes:
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//
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//
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// History: 19-May-94 ArnoldM Created
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//
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//--------------------------------------------------------------------------
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#include <secpch2.hxx>
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#pragma hdrstop
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// A class for initing the critical section needed by the time set
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// code in gettime.c. The code there relies on a critical section to
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// serialize the time slew settings. Rather than require each exe
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// that uses this library to put in calls to initialize the section and
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// to undo any time slew settings on exit, we create this class and use
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// a static constructor to do the appropriate calls. It's one of the
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// times that using C++ is a pleasure.
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//
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// The class also winds up owning the Critical Section. This is to create
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// the proper dependence on this code module so that the loader loads all of
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// the required pieces. Doing this adds a bit more overhead to Enter and
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// Leave the critical section, but it's done rarely enough that it shouldn't
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// matter.
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class _TimeSlew
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{
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public:
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~_TimeSlew();
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_TimeSlew();
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// The two wrappers for entering and leaving the critical section.
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VOID EnterCS();
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VOID LeaveCS();
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private:
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CRITICAL_SECTION csAdjSection;
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};
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// No one needs to look at this, ever. Since the class has no state, the
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// instance memory consumption should be nil (wonder if it really is?).
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static
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class _TimeSlew TimeSlew;
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// reference the routines in gettime.c we exist to serve
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extern "C"
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{
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VOID
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SecMiscTimeSettingInit();
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VOID
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SecMiscTimeSettingDone();
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}
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//+--------------------------------------------------------------------------
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//
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// _TimeSlew::_TimeSlew -- constructor
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// and
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// _TimeSlew::~_TimeSlew -- destructor
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//
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// These are simply class wrappers for the C routines in gettime.c
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// They provide a way to avoid having to put explicit calls
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// into .exes
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//
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//---------------------------------------------------------------------------
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_TimeSlew::_TimeSlew()
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{
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InitializeCriticalSection(&csAdjSection);
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SecMiscTimeSettingInit();
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}
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_TimeSlew::~_TimeSlew()
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{
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SecMiscTimeSettingDone();
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DeleteCriticalSection(&csAdjSection);
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}
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//-----------------------------------------------------------------------------
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//
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// and the rest of the cast
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//
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//-----------------------------------------------------------------------------
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inline
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VOID
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_TimeSlew::EnterCS()
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{
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EnterCriticalSection(&csAdjSection);
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}
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inline
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VOID
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_TimeSlew::LeaveCS()
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{
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LeaveCriticalSection(&csAdjSection);
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}
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//----------------------------------------------------------------------------
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//
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// API wrappers for the above
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//
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//----------------------------------------------------------------------------
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extern "C"
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VOID
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SMEnterCriticalSection()
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{
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TimeSlew.EnterCS();
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}
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extern "C"
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VOID
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SMLeaveCriticalSection()
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{
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TimeSlew.LeaveCS();
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}
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