Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 103 insertions, 0 deletions

diff --git a/comphelper/source/misc/solarmutex.cxx b/comphelper/source/misc/solarmutex.cxx
new file mode 100644
index 000000000..5d1052327
--- /dev/null
+++ b/comphelper/source/misc/solarmutex.cxx
@@ -0,0 +1,103 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <comphelper/solarmutex.hxx>
+#include <osl/thread.hxx>
+
+#include <assert.h>
+#include <cstdlib>
+
+namespace comphelper {
+
+namespace {
+    SolarMutex* g_pSolarMutex = nullptr;
+}
+
+SolarMutex *SolarMutex::get()
+{
+    return g_pSolarMutex;
+}
+
+SolarMutex::SolarMutex()
+    : m_nCount( 0 )
+    , m_nThreadId( 0 )
+    , m_aBeforeReleaseHandler( nullptr )
+{
+    assert(!g_pSolarMutex);
+    g_pSolarMutex = this;
+}
+
+SolarMutex::~SolarMutex()
+{
+    g_pSolarMutex = nullptr;
+}
+
+void SolarMutex::doAcquire( const sal_uInt32 nLockCount )
+{
+    for ( sal_uInt32 n = nLockCount; n ; --n )
+        m_aMutex.acquire();
+    m_nThreadId = osl::Thread::getCurrentIdentifier();
+    m_nCount += nLockCount;
+}
+
+sal_uInt32 SolarMutex::doRelease( bool bUnlockAll )
+{
+    if ( !IsCurrentThread() )
+        std::abort();
+    if ( m_nCount == 0 )
+        std::abort();
+
+    const sal_uInt32 nCount = bUnlockAll ? m_nCount : 1;
+    m_nCount -= nCount;
+
+    if ( 0 == m_nCount )
+    {
+        if ( m_aBeforeReleaseHandler )
+            m_aBeforeReleaseHandler();
+        m_nThreadId = 0;
+    }
+
+    for ( sal_uInt32 n = nCount ; n ; --n )
+        m_aMutex.release();
+
+    return nCount;
+}
+
+bool SolarMutex::IsCurrentThread() const
+{
+    return m_nThreadId == osl::Thread::getCurrentIdentifier();
+}
+
+bool SolarMutex::tryToAcquire()
+{
+    if ( m_aMutex.tryToAcquire() )
+    {
+        m_nThreadId = osl::Thread::getCurrentIdentifier();
+        m_nCount++;
+        return true;
+    }
+    else
+        return false;
+}
+
+} // namespace comphelper
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */