root/MMgc/OOM.h

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/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 4 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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 *   leon.sha@sun.com
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#ifndef __OOM_H__
#define __OOM_H__

#define MMGC_ENTER_VOID                                                 \
        MMgc::GCHeap::EnterLock();                                      \
        if(MMgc::GCHeap::ShouldNotEnter())                      \
        {                                                                                       \
                MMgc::GCHeap::EnterRelease();                   \
                return;                                                                 \
        }                                                                                       \
        MMgc::EnterFrame _ef;                                           \
        MMgc::GCHeap::EnterRelease();                           \
        _ef.status = VMPI_setjmpNoUnwind(_ef.jmpbuf);            \
        if(_ef.status != 0)                                                     \
                return;


#define MMGC_ENTER_VOID_NO_GUARD                                \
        MMgc::GCHeap::EnterLock();                                      \
        MMgc::EnterFrame _ef;                                           \
        MMgc::GCHeap::EnterRelease();                           \
        _ef.status = VMPI_setjmpNoUnwind(_ef.jmpbuf);            \
        if(_ef.status != 0)                                                     \
                return;


#define MMGC_ENTER_RETURN(_val)                                 \
        MMgc::GCHeap::EnterLock();                                      \
        if(MMgc::GCHeap::ShouldNotEnter())                      \
        {                                                                                       \
                MMgc::GCHeap::EnterRelease();                   \
                return _val;                                                    \
        }                                                                                       \
        MMgc::EnterFrame _ef;                                           \
        MMgc::GCHeap::EnterRelease();                           \
        _ef.status = VMPI_setjmpNoUnwind(_ef.jmpbuf);            \
        if(_ef.status != 0)                                                     \
                return _val;

namespace MMgc
{
        class EnterFrame
        {
                friend class GCHeap;
                friend class FixedMalloc;
        public:
                EnterFrame();
                ~EnterFrame();
                jmp_buf jmpbuf;
                int status;
                void Destroy() { m_heap = NULL; }
                GC* GetActiveGC() { return m_gc; }
                void SetActiveGC(GC *gc) { m_gc = gc; }
                void SetCollectingGC(GC *gc){ m_collectingGC = gc; }
                GC* GetCollectingGC(){return m_collectingGC;}
        private:
                GCHeap *m_heap;
                GC *m_gc;
                GC *m_collectingGC;

        };
        
        typedef enum _MemoryStatus {
                kMemNormal,
                kMemSoftLimit,
                kMemHardLimit,
                kMemAbort
        } MemoryStatus;

        /**
         * Mutator oom callback mechanism, subclass and call GCHeap::AddOOMCallback
         */
        class OOMCallback
        {
        public:
                virtual ~OOMCallback() {}
                virtual void memoryStatusChange(MemoryStatus oldStatus, MemoryStatus newStatus) = 0;
        };
}

#endif /* __OOM_H__ */


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