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-rw-r--r--cppu/source/AffineBridge/AffineBridge.cxx360
1 files changed, 360 insertions, 0 deletions
diff --git a/cppu/source/AffineBridge/AffineBridge.cxx b/cppu/source/AffineBridge/AffineBridge.cxx
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+/* -*- 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 <osl/thread.hxx>
+#include <osl/conditn.hxx>
+#include <osl/mutex.hxx>
+#include <osl/diagnose.h>
+#include <sal/log.hxx>
+
+#include <cppu/Enterable.hxx>
+#include <cppu/helper/purpenv/Environment.hxx>
+#include <cppu/helper/purpenv/Mapping.hxx>
+#include <memory>
+
+namespace {
+
+class InnerThread;
+class OuterThread;
+
+class AffineBridge : public cppu::Enterable
+{
+public:
+ enum Msg
+ {
+ CB_DONE,
+ CB_FPOINTER
+ };
+
+ Msg m_message;
+ uno_EnvCallee * m_pCallee;
+ va_list * m_pParam;
+
+ osl::Mutex m_innerMutex;
+ oslThreadIdentifier m_innerThreadId;
+ std::unique_ptr<InnerThread> m_pInnerThread;
+ osl::Condition m_innerCondition;
+ sal_Int32 m_enterCount;
+
+ osl::Mutex m_outerMutex;
+ oslThreadIdentifier m_outerThreadId;
+ osl::Condition m_outerCondition;
+ std::unique_ptr<OuterThread> m_pOuterThread;
+
+ explicit AffineBridge();
+ virtual ~AffineBridge() override;
+
+ virtual void v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam) override;
+ virtual void v_callOut_v (uno_EnvCallee * pCallee, va_list * pParam) override;
+
+ virtual void v_enter() override;
+ virtual void v_leave() override;
+
+ virtual bool v_isValid(OUString * pReason) override;
+
+ void innerDispatch();
+ void outerDispatch(bool loop);
+};
+
+class InnerThread : public osl::Thread
+{
+ virtual void SAL_CALL run() override;
+
+ AffineBridge * m_pAffineBridge;
+
+public:
+ explicit InnerThread(AffineBridge * threadEnvironment)
+ : m_pAffineBridge(threadEnvironment)
+ {
+ create();
+ }
+};
+
+}
+
+void InnerThread::run()
+{
+ osl_setThreadName("UNO AffineBridge InnerThread");
+
+ m_pAffineBridge->enter();
+ m_pAffineBridge->innerDispatch();
+ m_pAffineBridge->leave();
+}
+
+namespace {
+
+class OuterThread : public osl::Thread
+{
+ virtual void SAL_CALL run() override;
+
+ AffineBridge * m_pAffineBridge;
+
+public:
+ explicit OuterThread(AffineBridge * threadEnvironment);
+};
+
+}
+
+OuterThread::OuterThread(AffineBridge * threadEnvironment)
+ : m_pAffineBridge(threadEnvironment)
+{
+ create();
+}
+
+void OuterThread::run()
+{
+ osl_setThreadName("UNO AffineBridge OuterThread");
+
+ osl::MutexGuard guard(m_pAffineBridge->m_outerMutex);
+
+ m_pAffineBridge->m_outerThreadId = getIdentifier();
+ m_pAffineBridge->outerDispatch(false);
+ m_pAffineBridge->m_outerThreadId = 0;
+
+ m_pAffineBridge->m_pOuterThread = nullptr;
+ m_pAffineBridge = nullptr;
+}
+
+
+AffineBridge::AffineBridge()
+ : m_message (CB_DONE),
+ m_pCallee (nullptr),
+ m_pParam (nullptr),
+ m_innerThreadId(0),
+ m_enterCount (0),
+ m_outerThreadId(0)
+{
+ SAL_INFO("cppu.affinebridge", "LIFE: AffineBridge::AffineBridge(uno_Environment * pEnv) -> " << this);
+}
+
+AffineBridge::~AffineBridge()
+{
+ SAL_INFO("cppu.affinebridge", "LIFE: AffineBridge::~AffineBridge() -> " << this);
+
+ if (m_pInnerThread && osl::Thread::getCurrentIdentifier() != m_innerThreadId)
+ {
+ m_message = CB_DONE;
+ m_innerCondition.set();
+
+ m_pInnerThread->join();
+ }
+
+ m_pInnerThread.reset();
+
+ if (m_pOuterThread)
+ {
+ m_pOuterThread->join();
+ }
+}
+
+
+void AffineBridge::outerDispatch(bool loop)
+{
+ OSL_ASSERT(m_outerThreadId == osl::Thread::getCurrentIdentifier());
+ OSL_ASSERT(m_innerThreadId != m_outerThreadId);
+
+ Msg mm;
+
+ do
+ {
+ // FIXME: created outer thread must not wait
+ // in case of no message
+ // note: no message can happen in case newly created
+ // outer thread acquire outerMutex after a real outer
+ // thread enters outerDispatch!
+ m_outerCondition.wait();
+ m_outerCondition.reset();
+
+ mm = m_message;
+
+ switch(mm)
+ {
+ case CB_DONE:
+ break;
+
+ case CB_FPOINTER:
+ {
+ m_pCallee(m_pParam);
+
+ m_message = CB_DONE;
+ m_innerCondition.set();
+ break;
+ }
+ default:
+ abort();
+ }
+ }
+ while(mm != CB_DONE && loop);
+}
+
+void AffineBridge::innerDispatch()
+{
+ OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+ OSL_ASSERT(m_innerThreadId != m_outerThreadId);
+
+ Msg mm;
+
+ do
+ {
+ m_innerCondition.wait();
+ m_innerCondition.reset();
+
+ mm = m_message;
+
+ switch(mm)
+ {
+ case CB_DONE:
+ break;
+
+ case CB_FPOINTER:
+ {
+ m_pCallee(m_pParam);
+
+ m_message = CB_DONE;
+ m_outerCondition.set();
+ break;
+ }
+ default:
+ abort();
+ }
+ }
+ while(mm != CB_DONE);
+}
+
+void AffineBridge::v_callInto_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+ osl::MutexGuard guard(m_outerMutex); // only one thread at a time can call into
+
+ if (m_innerThreadId == 0) // no inner thread yet
+ {
+ m_pInnerThread.reset(new InnerThread(this));
+ }
+
+ bool bResetId = false;
+ if (!m_outerThreadId)
+ {
+ m_outerThreadId = osl::Thread::getCurrentIdentifier();
+ bResetId = true;
+ }
+
+ m_message = CB_FPOINTER;
+ m_pCallee = pCallee;
+ m_pParam = pParam;
+ m_innerCondition.set();
+
+ outerDispatch(true);
+
+ if (bResetId)
+ m_outerThreadId = 0;
+}
+
+void AffineBridge::v_callOut_v(uno_EnvCallee * pCallee, va_list * pParam)
+{
+ OSL_ASSERT(m_innerThreadId);
+
+ osl::MutexGuard guard(m_innerMutex);
+
+ if (m_outerThreadId == 0) // no outer thread yet
+ {
+ osl::MutexGuard guard_m_outerMutex(m_outerMutex);
+
+ if (m_outerThreadId == 0)
+ {
+ if (m_pOuterThread)
+ {
+ m_pOuterThread->join();
+ }
+
+ m_pOuterThread.reset(new OuterThread(this));
+ }
+ }
+
+ m_message = CB_FPOINTER;
+ m_pCallee = pCallee;
+ m_pParam = pParam;
+ m_outerCondition.set();
+
+ innerDispatch();
+}
+
+void AffineBridge::v_enter()
+{
+ m_innerMutex.acquire();
+
+ if (!m_enterCount)
+ m_innerThreadId = osl::Thread::getCurrentIdentifier();
+
+ OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+
+ ++ m_enterCount;
+}
+
+void AffineBridge::v_leave()
+{
+ OSL_ASSERT(m_innerThreadId == osl::Thread::getCurrentIdentifier());
+
+ -- m_enterCount;
+ if (!m_enterCount)
+ m_innerThreadId = 0;
+
+ m_innerMutex.release();
+}
+
+bool AffineBridge::v_isValid(OUString * pReason)
+{
+ bool result = m_enterCount > 0;
+ if (!result)
+ *pReason = "not entered";
+
+ else
+ {
+ result = m_innerThreadId == osl::Thread::getCurrentIdentifier();
+
+ if (!result)
+ *pReason = "wrong thread";
+ }
+
+ if (result)
+ *pReason = "OK";
+
+ return result;
+}
+
+#ifdef DISABLE_DYNLOADING
+
+#define uno_initEnvironment affine_uno_uno_initEnvironment
+#define uno_ext_getMapping affine_uno_uno_ext_getMapping
+
+#endif
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_initEnvironment(uno_Environment * pEnv)
+ SAL_THROW_EXTERN_C()
+{
+ cppu::helper::purpenv::Environment_initWithEnterable(pEnv, new AffineBridge());
+}
+
+extern "C" void SAL_DLLPUBLIC_EXPORT uno_ext_getMapping(uno_Mapping ** ppMapping,
+ uno_Environment * pFrom,
+ uno_Environment * pTo )
+{
+ cppu::helper::purpenv::createMapping(ppMapping, pFrom, pTo);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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