1 files changed, 120 insertions, 0 deletions
diff --git a/unotools/source/i18n/readwritemutexguard.cxx b/unotools/source/i18n/readwritemutexguard.cxx
new file mode 100644
index 000000000000..6adc5bab14bf
--- /dev/null
+++ b/unotools/source/i18n/readwritemutexguard.cxx
@@ -0,0 +1,120 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+// MARKER(update_precomp.py): autogen include statement, do not remove
+#include "precompiled_unotools.hxx"
+#include "unotools/readwritemutexguard.hxx"
+#include <tools/debug.hxx>
+
+
+namespace utl {
+
+ReadWriteGuard::ReadWriteGuard( ReadWriteMutex& rMutexP,
+            sal_Int32 nRequestMode )
+        : rMutex( rMutexP )
+{
+    // don't do anything until a pending write completed (or another
+    // ReadWriteGuard leaves the ctor phase)
+    ::osl::MutexGuard aGuard( rMutex.pWriteMutex );
+    nMode = nRequestMode;
+    if ( nMode & ReadWriteGuardMode::nWrite )
+    {
+        rMutex.pWriteMutex->acquire();
+        // wait for any read to complete
+// TODO: set up a waiting thread instead of a loop
+        sal_Bool bWait = sal_True;
+        do
+        {
+            rMutex.pMutex->acquire();
+            bWait = (rMutex.nReadCount != 0);
+            if ( nMode & ReadWriteGuardMode::nCriticalChange )
+                bWait |= (rMutex.nBlockCriticalCount != 0);
+            rMutex.pMutex->release();
+        } while ( bWait );
+    }
+    else if ( nMode & ReadWriteGuardMode::nBlockCritical )
+    {
+        rMutex.pMutex->acquire();
+        ++rMutex.nBlockCriticalCount;
+        rMutex.pMutex->release();
+    }
+    else
+    {
+        rMutex.pMutex->acquire();
+        ++rMutex.nReadCount;
+        rMutex.pMutex->release();
+    }
+}
+
+
+ReadWriteGuard::~ReadWriteGuard()
+{
+    if ( nMode & ReadWriteGuardMode::nWrite )
+        rMutex.pWriteMutex->release();
+    else if ( nMode & ReadWriteGuardMode::nBlockCritical )
+    {
+        rMutex.pMutex->acquire();
+        --rMutex.nBlockCriticalCount;
+        rMutex.pMutex->release();
+    }
+    else
+    {
+        rMutex.pMutex->acquire();
+        --rMutex.nReadCount;
+        rMutex.pMutex->release();
+    }
+}
+
+
+void ReadWriteGuard::changeReadToWrite()
+{
+    sal_Bool bOk = !(nMode & (ReadWriteGuardMode::nWrite | ReadWriteGuardMode::nBlockCritical));
+    DBG_ASSERT( bOk, "ReadWriteGuard::changeReadToWrite: can't" );
+    if ( bOk )
+    {
+        // MUST release read before acquiring write mutex or dead lock would
+        // occur if there was a write in another thread waiting for this read
+        // to complete.
+        rMutex.pMutex->acquire();
+        --rMutex.nReadCount;
+        rMutex.pMutex->release();
+
+        rMutex.pWriteMutex->acquire();
+        nMode |= ReadWriteGuardMode::nWrite;
+        // wait for any other read to complete
+// TODO: set up a waiting thread instead of a loop
+        sal_Bool bWait = sal_True;
+        do
+        {
+            rMutex.pMutex->acquire();
+            bWait = (rMutex.nReadCount != 0);
+            rMutex.pMutex->release();
+        } while ( bWait );
+    }
+}
+
+}   // namespace utl