1 ///////////////////////////////////////////////////////////////////////////////
2 // Name: src/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 // Copyright: (c) 2001 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
9 // Licence: wxWindows licence
10 ///////////////////////////////////////////////////////////////////////////////
11
12 // ============================================================================
13 // declarations
14 // ============================================================================
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 // For compilers that support precompilation, includes "wx.h".
21 #include "wx/wxprec.h"
22
23 #ifdef __BORLANDC__
24 #pragma hdrstop
25 #endif
26
27 #if wxUSE_SNGLINST_CHECKER
28
29 #ifndef WX_PRECOMP
30 #include "wx/string.h"
31 #include "wx/log.h"
32 #endif //WX_PRECOMP
33
34 #include "wx/snglinst.h"
35
36 #define INCL_DOSSEMAPHORES
37 #define INCL_DOSERRORS
38 #include <os2.h>
39
40 #include "wx/os2/private.h"
41
42 // ----------------------------------------------------------------------------
43 // wxSingleInstanceCheckerImpl: the real implementation class
44 // ----------------------------------------------------------------------------
45
46 class WXDLLEXPORT wxSingleInstanceCheckerImpl
47 {
48 public:
wxSingleInstanceCheckerImpl()49 wxSingleInstanceCheckerImpl()
50 {
51 m_hMutex = NULL;
52 m_anotherRunning = false;
53 }
54
Create(const wxString & name)55 bool Create(const wxString& name)
56 {
57 wxString semName;
58 semName.Printf(wxT("\\SEM32\\%s"), name.c_str());
59 int rc = DosCreateMutexSem(semName.c_str(), &m_hMutex, DC_SEM_SHARED, 1);
60
61 if ( rc == NO_ERROR ) {
62 m_anotherRunning = false;
63 return true;
64 } else if ( rc == ERROR_DUPLICATE_NAME ) {
65 m_anotherRunning = true;
66 return true;
67 } else {
68 m_anotherRunning = false; // we don't know for sure in this case
69 wxLogLastError(wxT("DosCreateMutexSem"));
70 return false;
71 }
72 }
73
IsAnotherRunning() const74 bool IsAnotherRunning() const
75 {
76 return m_anotherRunning;
77 }
78
~wxSingleInstanceCheckerImpl()79 ~wxSingleInstanceCheckerImpl()
80 {
81 if ( m_hMutex )
82 {
83 if ( !::DosCloseMutexSem(m_hMutex) )
84 {
85 wxLogLastError(wxT("DosCloseMutexSem"));
86 }
87 }
88 }
89
90 private:
91 // if true, creating the mutex either succeeded
92 // or we know it failed because another app is running.
93 bool m_anotherRunning;
94
95 // the mutex handle, may be NULL
96 HMTX m_hMutex;
97
98 DECLARE_NO_COPY_CLASS(wxSingleInstanceCheckerImpl)
99 };
100
101 // ============================================================================
102 // wxSingleInstanceChecker implementation
103 // ============================================================================
104
Create(const wxString & name,const wxString & WXUNUSED (path))105 bool wxSingleInstanceChecker::Create(const wxString& name,
106 const wxString& WXUNUSED(path))
107 {
108 wxASSERT_MSG( !m_impl,
109 wxT("calling wxSingleInstanceChecker::Create() twice?") );
110
111 // creating unnamed mutex doesn't have the same semantics!
112 wxASSERT_MSG( !name.empty(), wxT("mutex name can't be empty") );
113
114 m_impl = new wxSingleInstanceCheckerImpl;
115
116 return m_impl->Create(name);
117 }
118
DoIsAnotherRunning() const119 bool wxSingleInstanceChecker::DoIsAnotherRunning() const
120 {
121 wxCHECK_MSG( m_impl, false, wxT("must call Create() first") );
122
123 return m_impl->IsAnotherRunning();
124 }
125
~wxSingleInstanceChecker()126 wxSingleInstanceChecker::~wxSingleInstanceChecker()
127 {
128 delete m_impl;
129 }
130
131 #endif // wxUSE_SNGLINST_CHECKER
132