75acc7bf81
Moved headers from include/libutils and include/libsysutils to libutils/include and libsysutils/include respectively, so they can be exported via these libs. They needed to be moved since Soong does not allow export from external folder. Added symlink from old locations. They are needed since Soong includes system/core/include by default. Once all modules are cleaned up to explicitly add the required libs, the symlinks will be removed. Moved headers of libutils to libutils_headers. They should be used by modules for header-only inlines. Added libutils_headers as dependency of libutils. Split of C++ headers into those that have no dependency and those that have dependency on libutils.so will be handled in a later CL. Test: Add above libs to shared lib of local module Change-Id: I122db72056b26b1f39bad1d9a0c2a1c5efda3550
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_UTILS_SINGLETON_H
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#define ANDROID_UTILS_SINGLETON_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <utils/Mutex.h>
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#include <utils/threads.h>
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#include <cutils/compiler.h>
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namespace android {
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// ---------------------------------------------------------------------------
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template <typename TYPE>
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class ANDROID_API Singleton
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{
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public:
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static TYPE& getInstance() {
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Mutex::Autolock _l(sLock);
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TYPE* instance = sInstance;
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if (instance == 0) {
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instance = new TYPE();
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sInstance = instance;
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}
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return *instance;
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}
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static bool hasInstance() {
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Mutex::Autolock _l(sLock);
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return sInstance != 0;
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}
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protected:
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~Singleton() { }
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Singleton() { }
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private:
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Singleton(const Singleton&);
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Singleton& operator = (const Singleton&);
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static Mutex sLock;
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static TYPE* sInstance;
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};
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template <typename TYPE>
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Mutex Singleton<TYPE>::sLock;
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template <typename TYPE>
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TYPE* Singleton<TYPE>::sInstance;
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/*
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* use ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) in your implementation file
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* (eg: <TYPE>.cpp) to create the static instance of Singleton<>'s attributes,
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* and avoid to have a copy of them in each compilation units Singleton<TYPE>
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* is used.
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* NOTE: we use a version of Mutex ctor that takes a parameter, because
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* for some unknown reason using the default ctor doesn't emit the variable!
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*/
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#define ANDROID_SINGLETON_STATIC_INSTANCE(TYPE) \
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template<> ::android::Mutex \
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(::android::Singleton< TYPE >::sLock)(::android::Mutex::PRIVATE); \
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template<> TYPE* ::android::Singleton< TYPE >::sInstance(0); \
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template class ::android::Singleton< TYPE >;
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// ---------------------------------------------------------------------------
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}; // namespace android
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#endif // ANDROID_UTILS_SINGLETON_H
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