src/os2/snglinst.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        os2/snglinst.cpp
   3 // Purpose:     implements wxSingleInstanceChecker class for OS/2 using
   4 //              named mutexes
   5 // Author:      Vadim Zeitlin
   6 // Modified by: Lauri Nurmi (modified for OS/2)
   7 // Created:     08.02.2009
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
  10 // License:     wxWindows licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 // ============================================================================
  14 // declarations
  15 // ============================================================================
  16
  17 // ----------------------------------------------------------------------------
  18 // headers
  19 // ----------------------------------------------------------------------------
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #ifdef __BORLANDC__
  25     #pragma hdrstop
  26 #endif
  27
  28 #if wxUSE_SNGLINST_CHECKER
  29
  30 #ifndef WX_PRECOMP
  31     #include "wx/string.h"
  32     #include "wx/log.h"
  33 #endif //WX_PRECOMP
  34
  35 #include "wx/snglinst.h"
  36
  37 #define INCL_DOSSEMAPHORES
  38 #define INCL_DOSERRORS
  39 #include <os2.h>
  40
  41 #include "wx/os2/private.h"
  42
  43 // ----------------------------------------------------------------------------
  44 // wxSingleInstanceCheckerImpl: the real implementation class
  45 // ----------------------------------------------------------------------------
  46
  47 class WXDLLEXPORT wxSingleInstanceCheckerImpl
  48 {
  49 public:
  50     wxSingleInstanceCheckerImpl()
  51     {
  52         m_hMutex = NULL;
  53         m_anotherRunning = false;
  54     }
  55
  56     bool Create(const wxString& name)
  57     {
  58         wxString semName;
  59         semName.Printf(wxT("\\SEM32\\%s"), name.c_str());
  60         int rc = DosCreateMutexSem(semName.c_str(), &m_hMutex, DC_SEM_SHARED, 1);
  61
  62         if ( rc == NO_ERROR ) {
  63             m_anotherRunning = false;
  64             return true;
  65         } else if ( rc == ERROR_DUPLICATE_NAME ) {
  66             m_anotherRunning = true;
  67             return true;
  68         } else {
  69             m_anotherRunning = false;  // we don't know for sure in this case
  70             wxLogLastError(_T("DosCreateMutexSem"));
  71             return false;
  72         }
  73     }
  74
  75     bool IsAnotherRunning() const
  76     {
  77         return m_anotherRunning;
  78     }
  79
  80     ~wxSingleInstanceCheckerImpl()
  81     {
  82         if ( m_hMutex )
  83         {
  84             if ( !::DosCloseMutexSem(m_hMutex) )
  85             {
  86                 wxLogLastError(_T("DosCloseMutexSem"));
  87             }
  88         }
  89     }
  90
  91 private:
  92     // if true, creating the mutex either succeeded
  93     // or we know it failed because another app is running.
  94     bool m_anotherRunning;
  95
  96     // the mutex handle, may be NULL
  97     HMTX m_hMutex;
  98
  99     DECLARE_NO_COPY_CLASS(wxSingleInstanceCheckerImpl)
 100 };
 101
 102 // ============================================================================
 103 // wxSingleInstanceChecker implementation
 104 // ============================================================================
 105
 106 bool wxSingleInstanceChecker::Create(const wxString& name,
 107                                      const wxString& WXUNUSED(path))
 108 {
 109     wxASSERT_MSG( !m_impl,
 110                   _T("calling wxSingleInstanceChecker::Create() twice?") );
 111
 112     // creating unnamed mutex doesn't have the same semantics!
 113     wxASSERT_MSG( !name.empty(), _T("mutex name can't be empty") );
 114
 115     m_impl = new wxSingleInstanceCheckerImpl;
 116
 117     return m_impl->Create(name);
 118 }
 119
 120 bool wxSingleInstanceChecker::IsAnotherRunning() const
 121 {
 122     wxCHECK_MSG( m_impl, false, _T("must call Create() first") );
 123
 124     return m_impl->IsAnotherRunning();
 125 }
 126
 127 wxSingleInstanceChecker::~wxSingleInstanceChecker()
 128 {
 129     delete m_impl;
 130 }
 131
 132 #endif // wxUSE_SNGLINST_CHECKER