+class CrashRecoveryContextCleanup {
+protected:
+ CrashRecoveryContext *context;
+ CrashRecoveryContextCleanup(CrashRecoveryContext *context)
+ : context(context), cleanupFired(false) {}
+public:
+ bool cleanupFired;
+
+ virtual ~CrashRecoveryContextCleanup();
+ virtual void recoverResources() = 0;
+
+ CrashRecoveryContext *getContext() const {
+ return context;
+ }
+
+private:
+ friend class CrashRecoveryContext;
+ CrashRecoveryContextCleanup *prev, *next;
+};
+
+template<typename DERIVED, typename T>
+class CrashRecoveryContextCleanupBase : public CrashRecoveryContextCleanup {
+protected:
+ T *resource;
+ CrashRecoveryContextCleanupBase(CrashRecoveryContext *context, T* resource)
+ : CrashRecoveryContextCleanup(context), resource(resource) {}
+public:
+ static DERIVED *create(T *x) {
+ if (x) {
+ if (CrashRecoveryContext *context = CrashRecoveryContext::GetCurrent())
+ return new DERIVED(context, x);
+ }
+ return 0;
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextDestructorCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDestructorCleanup<T>, T> {
+public:
+ CrashRecoveryContextDestructorCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDestructorCleanup<T>, T>(context, resource) {}
+
+ virtual void recoverResources() {
+ this->resource->~T();
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextDeleteCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextDeleteCleanup<T>, T> {
+public:
+ CrashRecoveryContextDeleteCleanup(CrashRecoveryContext *context, T *resource)
+ : CrashRecoveryContextCleanupBase<
+ CrashRecoveryContextDeleteCleanup<T>, T>(context, resource) {}
+
+ virtual void recoverResources() {
+ delete this->resource;
+ }
+};
+
+template <typename T>
+class CrashRecoveryContextReleaseRefCleanup : public
+ CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>, T>
+{
+public:
+ CrashRecoveryContextReleaseRefCleanup(CrashRecoveryContext *context,
+ T *resource)
+ : CrashRecoveryContextCleanupBase<CrashRecoveryContextReleaseRefCleanup<T>,
+ T>(context, resource) {}
+
+ virtual void recoverResources() {
+ this->resource->Release();
+ }
+};
+
+template <typename T, typename Cleanup = CrashRecoveryContextDeleteCleanup<T> >
+class CrashRecoveryContextCleanupRegistrar {
+ CrashRecoveryContextCleanup *cleanup;
+public:
+ CrashRecoveryContextCleanupRegistrar(T *x)
+ : cleanup(Cleanup::create(x)) {
+ if (cleanup)
+ cleanup->getContext()->registerCleanup(cleanup);
+ }
+
+ ~CrashRecoveryContextCleanupRegistrar() {
+ unregister();
+ }
+
+ void unregister() {
+ if (cleanup && !cleanup->cleanupFired)
+ cleanup->getContext()->unregisterCleanup(cleanup);
+ cleanup = 0;
+ }
+};