We now have a current svn snapshot of libqxt in our contrib dir, and

[quassel.git] / src / contrib / libqxt-2007-10-24 / src / core / qxtsemaphore.cpp

diff --git a/src/contrib/libqxt-2007-10-24/src/core/qxtsemaphore.cpp b/src/contrib/libqxt-2007-10-24/src/core/qxtsemaphore.cpp
new file mode 100644 (file)
index 0000000..a7be0fd
--- /dev/null
+++ b/src/contrib/libqxt-2007-10-24/src/core/qxtsemaphore.cpp
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) Qxt Foundation. Some rights reserved.
+**
+** This file is part of the QxtCore module of the Qt eXTension library
+**
+** This library is free software; you can redistribute it and/or modify it
+** under the terms of th Common Public License, version 1.0, as published by
+** IBM.
+**
+** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY
+** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
+** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
+** FITNESS FOR A PARTICULAR PURPOSE.
+**
+** You should have received a copy of the CPL along with this file.
+** See the LICENSE file and the cpl1.0.txt file included with the source
+** distribution for more information. If you did not receive a copy of the
+** license, contact the Qxt Foundation.
+**
+** <http://libqxt.sourceforge.net>  <foundation@libqxt.org>
+**
+****************************************************************************/
+#include "qxtsemaphore.h"
+
+/**
+\class QxtSemaphore QxtSemaphore
+\ingroup QxtCore
+\brief system wide semaphore (former QxtSingleInstance)
+
+
+\code
+       QxtSemaphore instance("com.mycompany.foobla.uniquestring");
+       if(!instance.trylock())
+               {
+               qDebug("already started")
+               }
+
+\endcode
+
+Note that the semaphore is autoaticly unlocked on destruction, but not on segfault,sigkill,etc...!
+*/
+
+#ifdef Q_WS_WIN
+#include "Windows.h"
+
+class QxtSemaphorePrivate : public QxtPrivate<QxtSemaphore>
+{
+public:
+    QString name;
+    unsigned sem_m;
+    void init()
+    {
+        sem_m=0;
+    }
+
+    bool trylock()
+    {
+        sem_m = (unsigned ) CreateSemaphoreA ( NULL , 1 , 2 , qPrintable("Global\\"+name) );
+        if (sem_m == 0 )
+            return false;
+        return true;
+    }
+    bool unlock()
+    {
+        if (sem_m==0)
+            return false;
+        return CloseHandle((void *)sem_m);
+    }
+};
+
+
+
+#else
+
+#include <semaphore.h>
+#include <fcntl.h>
+#include <errno.h>
+
+class QxtSemaphorePrivate : public QxtPrivate<QxtSemaphore>
+{
+public:
+    QString name;
+    sem_t* m_sem;
+    bool s_N;
+    void init()
+    {
+        s_N=false;
+        m_sem=NULL;
+    }
+
+    bool trylock()
+    {
+        m_sem=sem_open(qPrintable(name), O_CREAT, S_IRUSR | S_IWUSR, 1);
+        if (m_sem==(sem_t*)(SEM_FAILED) || sem_trywait(m_sem))
+        {
+            m_sem=NULL;
+            s_N=true;
+            return false;
+        }
+        s_N=false;
+        return true;
+    }
+    bool unlock()
+    {
+        if (m_sem==NULL)
+            return false;
+        if (!s_N)
+        {
+            sem_post(m_sem);
+        }
+        return (sem_close(m_sem)==0);
+    }
+};
+
+#endif
+
+QxtSemaphore::QxtSemaphore(QString uniqueID)
+{
+    qxt_d().name=uniqueID;
+    qxt_d().init();
+}
+
+QxtSemaphore::~QxtSemaphore()
+{
+    unlock();
+}
+
+bool QxtSemaphore::trylock()
+{
+    return qxt_d().trylock();
+}
+bool QxtSemaphore::unlock()
+{
+    return qxt_d().unlock();
+}