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shared-object.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2017
00008  *
00009  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 namespace Gecode {
00035 
00046   class SharedHandle {
00047   public:
00053     class GECODE_KERNEL_EXPORT Object : public HeapAllocated {
00054       friend class SharedHandle;
00055     private:
00057       Support::RefCount rc;
00058     public:
00060       Object(void);
00062       virtual ~Object(void);
00063     };
00064   private:
00066     Object* o;
00068     void subscribe(void);
00070     void cancel(void);
00071   public:
00073     SharedHandle(void);
00075     SharedHandle(SharedHandle::Object* so);
00077     SharedHandle(const SharedHandle& sh);
00079     SharedHandle& operator =(const SharedHandle& sh);
00081     ~SharedHandle(void);
00083     explicit operator bool(void) const;
00084   protected:
00086     SharedHandle::Object* object(void) const;
00088     void object(SharedHandle::Object* n);
00089   };
00090 
00091 
00092   forceinline
00093   SharedHandle::Object::Object(void)
00094     : rc(0) {}
00095   forceinline
00096   SharedHandle::Object::~Object(void) {
00097     assert(!rc);
00098   }
00099 
00100 
00101   forceinline SharedHandle::Object*
00102   SharedHandle::object(void) const {
00103     return o;
00104   }
00105   forceinline void
00106   SharedHandle::subscribe(void) {
00107     if (o != nullptr) o->rc.inc();
00108   }
00109   forceinline void
00110   SharedHandle::cancel(void) {
00111     if ((o != nullptr) && o->rc.dec())
00112       delete o;
00113     o=nullptr;
00114   }
00115   forceinline void
00116   SharedHandle::object(SharedHandle::Object* n) {
00117     if (n != o) {
00118       cancel(); o=n; subscribe();
00119     }
00120   }
00121   forceinline
00122   SharedHandle::SharedHandle(void) : o(nullptr) {}
00123   forceinline
00124   SharedHandle::SharedHandle(SharedHandle::Object* so) : o(so) {
00125     subscribe();
00126   }
00127   forceinline
00128   SharedHandle::SharedHandle(const SharedHandle& sh) : o(sh.o) {
00129     subscribe();
00130   }
00131   forceinline SharedHandle&
00132   SharedHandle::operator =(const SharedHandle& sh) {
00133     if (&sh != this) {
00134       cancel(); o=sh.o; subscribe();
00135     }
00136     return *this;
00137   }
00138   forceinline
00139   SharedHandle::operator bool(void) const {
00140     return o != nullptr;
00141   }
00142   forceinline
00143   SharedHandle::~SharedHandle(void) {
00144     cancel();
00145   }
00146 
00147 }
00148 
00149 // STATISTICS: kernel-memory