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1///////////////////////////////////////////////////////////////////////////////
2// Name: msw/snglinst.cpp
3// Purpose: implements wxSingleInstanceChecker class for Win32 using
4// named mutexes
5// Author: Vadim Zeitlin
6// Modified by:
7// Created: 08.06.01
8// RCS-ID: $Id$
9// Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
10// License: wxWindows license
11///////////////////////////////////////////////////////////////////////////////
12
13// ============================================================================
14// declarations
15// ============================================================================
16
17// ----------------------------------------------------------------------------
18// headers
19// ----------------------------------------------------------------------------
20
21#ifdef __GNUG__
22 #pragma implementation "snglinst.h"
23#endif
24
25// For compilers that support precompilation, includes "wx.h".
26#include "wx/wxprec.h"
27
28#ifdef __BORLANDC__
29 #pragma hdrstop
30#endif
31
32#if wxUSE_SNGLINST_CHECKER && defined(__WIN32__)
33
34#ifndef WX_PRECOMP
35 #include "wx/string.h"
36 #include "wx/log.h"
37#endif //WX_PRECOMP
38
39#include "wx/snglinst.h"
40
41#include "wx/msw/private.h"
42
43// ----------------------------------------------------------------------------
44// wxSingleInstanceCheckerImpl: the real implementation class
45// ----------------------------------------------------------------------------
46
47class WXDLLEXPORT wxSingleInstanceCheckerImpl
48{
49public:
50 wxSingleInstanceCheckerImpl()
51 {
52 // we don't care about m_wasOpened, it can't be accessed before being
53 // initialized
54 m_hMutex = NULL;
55 }
56
57 bool Create(const wxString& name)
58 {
59 m_hMutex = ::CreateMutex(NULL, FALSE, name);
60 if ( !m_hMutex )
61 {
62 wxLogLastError(_T("CreateMutex"));
63
64 return FALSE;
65 }
66
67 // mutex was either created or opened - see what really happened
68 m_wasOpened = ::GetLastError() == ERROR_ALREADY_EXISTS;
69
70 return TRUE;
71 }
72
73 bool WasOpened() const
74 {
75 wxCHECK_MSG( m_hMutex, FALSE,
76 _T("can't be called if mutex creation failed") );
77
78 return m_wasOpened;
79 }
80
81 ~wxSingleInstanceCheckerImpl()
82 {
83 if ( m_hMutex )
84 {
85 if ( !::CloseHandle(m_hMutex) )
86 {
87 wxLogLastError(_T("CloseHandle(mutex)"));
88 }
89 }
90 }
91
92private:
93 // the result of the CreateMutex() call
94 bool m_wasOpened;
95
96 // the mutex handle, may be NULL
97 HANDLE m_hMutex;
98};
99
100// ============================================================================
101// wxSingleInstanceChecker implementation
102// ============================================================================
103
104bool wxSingleInstanceChecker::Create(const wxString& name,
105 const wxString& WXUNUSED(path))
106{
107 wxASSERT_MSG( !m_impl,
108 _T("calling wxSingleInstanceChecker::Create() twice?") );
109
110 // creating unnamed mutex doesn't have the same semantics!
111 wxASSERT_MSG( !name.empty(), _T("mutex name can't be empty") );
112
113 m_impl = new wxSingleInstanceCheckerImpl;
114
115 return m_impl->Create(name);
116}
117
118bool wxSingleInstanceChecker::IsAnotherRunning() const
119{
120 wxCHECK_MSG( m_impl, FALSE, _T("must call Create() first") );
121
122 // if the mutex had been opened, another instance is running - otherwise we
123 // would have created it
124 return m_impl->WasOpened();
125}
126
127wxSingleInstanceChecker::~wxSingleInstanceChecker()
128{
129 delete m_impl;
130}
131
132#endif // wxUSE_SNGLINST_CHECKER