d699f48ba3
the Watcom and other compilers. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@11217 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
133 lines
3.6 KiB
C++
133 lines
3.6 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: msw/snglinst.cpp
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// Purpose: implements wxSingleInstanceChecker class for Win32 using
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// named mutexes
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 08.06.01
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// RCS-ID: $Id$
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// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// License: wxWindows license
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///////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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#ifdef __GNUG__
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#pragma implementation "snglinst.h"
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#endif
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#if wxUSE_SNGLINST_CHECKER && defined(__WIN32__)
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#ifndef WX_PRECOMP
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#include "wx/string.h"
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#include "wx/log.h"
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#endif //WX_PRECOMP
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#include "wx/snglinst.h"
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#include "wx/msw/private.h"
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// ----------------------------------------------------------------------------
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// wxSingleInstanceCheckerImpl: the real implementation class
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// ----------------------------------------------------------------------------
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class WXDLLEXPORT wxSingleInstanceCheckerImpl
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{
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public:
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wxSingleInstanceCheckerImpl()
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{
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// we don't care about m_wasOpened, it can't be accessed before being
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// initialized
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m_hMutex = NULL;
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}
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bool Create(const wxString& name)
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{
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m_hMutex = ::CreateMutex(NULL, FALSE, name);
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if ( !m_hMutex )
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{
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wxLogLastError(_T("CreateMutex"));
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return FALSE;
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}
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// mutex was either created or opened - see what really happened
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m_wasOpened = ::GetLastError() == ERROR_ALREADY_EXISTS;
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return TRUE;
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}
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bool WasOpened() const
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{
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wxCHECK_MSG( m_hMutex, FALSE,
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_T("can't be called if mutex creation failed") );
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return m_wasOpened;
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}
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~wxSingleInstanceCheckerImpl()
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{
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if ( m_hMutex )
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{
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if ( !::CloseHandle(m_hMutex) )
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{
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wxLogLastError(_T("CloseHandle(mutex)"));
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}
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}
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}
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private:
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// the result of the CreateMutex() call
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bool m_wasOpened;
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// the mutex handle, may be NULL
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HANDLE m_hMutex;
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};
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// ============================================================================
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// wxSingleInstanceChecker implementation
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// ============================================================================
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bool wxSingleInstanceChecker::Create(const wxString& name,
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const wxString& WXUNUSED(path))
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{
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wxASSERT_MSG( !m_impl,
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_T("calling wxSingleInstanceChecker::Create() twice?") );
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// creating unnamed mutex doesn't have the same semantics!
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wxASSERT_MSG( !name.empty(), _T("mutex name can't be empty") );
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m_impl = new wxSingleInstanceCheckerImpl;
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return m_impl->Create(name);
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}
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bool wxSingleInstanceChecker::IsAnotherRunning() const
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{
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wxCHECK_MSG( m_impl, FALSE, _T("must call Create() first") );
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// if the mutex had been opened, another instance is running - otherwise we
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// would have created it
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return m_impl->WasOpened();
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}
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wxSingleInstanceChecker::~wxSingleInstanceChecker()
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{
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delete m_impl;
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}
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#endif // wxUSE_SNGLINST_CHECKER
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