From f0838d63f30556cb7c74257a4612b3d418153ce4 Mon Sep 17 00:00:00 2001
From: Stefan Neis <Stefan.Neis@t-online.de>
Date: Sat, 21 Feb 2009 13:52:20 +0000
Subject: [PATCH] Added wxSingleInstanceChecker for OS/2 (patch #10491).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@59068 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 build/bakefiles/files.bkl |   1 +
 src/os2/snglinst.cpp      | 132 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 133 insertions(+)
 create mode 100644 src/os2/snglinst.cpp

diff --git a/build/bakefiles/files.bkl b/build/bakefiles/files.bkl
index ef2cc9efb1..028f35933f 100644
--- a/build/bakefiles/files.bkl
+++ b/build/bakefiles/files.bkl
@@ -235,6 +235,7 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     src/unix/timerunx.cpp
     src/os2/dir.cpp
     src/os2/mimetype.cpp
+    src/os2/snglinst.cpp
     src/os2/stdpaths.cpp
     src/os2/thread.cpp
     src/os2/utils.cpp
diff --git a/src/os2/snglinst.cpp b/src/os2/snglinst.cpp
new file mode 100644
index 0000000000..eb95aa3c39
--- /dev/null
+++ b/src/os2/snglinst.cpp
@@ -0,0 +1,132 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        os2/snglinst.cpp
+// Purpose:     implements wxSingleInstanceChecker class for OS/2 using
+//              named mutexes
+// Author:      Vadim Zeitlin
+// Modified by: Lauri Nurmi (modified for OS/2)
+// Created:     08.02.2009
+// RCS-ID:      $Id$
+// Copyright:   (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
+// License:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#if wxUSE_SNGLINST_CHECKER
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+    #include "wx/log.h"
+#endif //WX_PRECOMP
+
+#include "wx/snglinst.h"
+
+#define INCL_DOSSEMAPHORES
+#define INCL_DOSERRORS
+#include <os2.h>
+
+#include "wx/os2/private.h"
+
+// ----------------------------------------------------------------------------
+// wxSingleInstanceCheckerImpl: the real implementation class
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxSingleInstanceCheckerImpl
+{
+public:
+    wxSingleInstanceCheckerImpl()
+    {
+        m_hMutex = NULL;
+        m_anotherRunning = false;
+    }
+
+    bool Create(const wxString& name)
+    {
+        wxString semName;
+        semName.Printf(wxT("\\SEM32\\%s"), name.c_str());
+        int rc = DosCreateMutexSem(semName.c_str(), &m_hMutex, DC_SEM_SHARED, 1);
+
+        if ( rc == NO_ERROR ) {
+            m_anotherRunning = false;
+            return true;
+        } else if ( rc == ERROR_DUPLICATE_NAME ) {
+            m_anotherRunning = true;
+            return true;
+        } else {
+            m_anotherRunning = false;  // we don't know for sure in this case
+            wxLogLastError(_T("DosCreateMutexSem"));
+            return false;
+        }
+    }
+
+    bool IsAnotherRunning() const
+    {
+        return m_anotherRunning;
+    }
+
+    ~wxSingleInstanceCheckerImpl()
+    {
+        if ( m_hMutex )
+        {
+            if ( !::DosCloseMutexSem(m_hMutex) )
+            {
+                wxLogLastError(_T("DosCloseMutexSem"));
+            }
+        }
+    }
+
+private:
+    // if true, creating the mutex either succeeded
+    // or we know it failed because another app is running.
+    bool m_anotherRunning;
+
+    // the mutex handle, may be NULL
+    HMTX m_hMutex;
+
+    DECLARE_NO_COPY_CLASS(wxSingleInstanceCheckerImpl)
+};
+
+// ============================================================================
+// wxSingleInstanceChecker implementation
+// ============================================================================
+
+bool wxSingleInstanceChecker::Create(const wxString& name,
+                                     const wxString& WXUNUSED(path))
+{
+    wxASSERT_MSG( !m_impl,
+                  _T("calling wxSingleInstanceChecker::Create() twice?") );
+
+    // creating unnamed mutex doesn't have the same semantics!
+    wxASSERT_MSG( !name.empty(), _T("mutex name can't be empty") );
+
+    m_impl = new wxSingleInstanceCheckerImpl;
+
+    return m_impl->Create(name);
+}
+
+bool wxSingleInstanceChecker::IsAnotherRunning() const
+{
+    wxCHECK_MSG( m_impl, false, _T("must call Create() first") );
+
+    return m_impl->IsAnotherRunning();
+}
+
+wxSingleInstanceChecker::~wxSingleInstanceChecker()
+{
+    delete m_impl;
+}
+
+#endif // wxUSE_SNGLINST_CHECKER
-- 
2.45.2