forked from KolibriOS/kolibrios
91 lines
2.2 KiB
C++
91 lines
2.2 KiB
C++
#ifndef __MENUET_HEAP_H_INCLUDED_
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#define __MENUET_HEAP_H_INCLUDED_
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#include <menuet.h>
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#include <memheap.h>
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// Menuet memory heap interface.
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namespace Menuet // All menuet functions, types and data are nested in the (Menuet) namespace.
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{
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void *Alloc(unsigned int size);
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void *ReAlloc(void *mem, unsigned int size);
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void Free(void *mem);
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}
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#ifdef __MENUET__
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namespace Menuet
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{
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// Global variables
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MemoryHeap::TFreeSpace _MenuetFreeSpace;
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MemoryHeap::TMemBlock _MenuetMemBlock;
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TMutex _MemHeapMutex = MENUET_MUTEX_INIT;
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// Functions
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void *_HeapInit(void *begin, void *use_end, void *end)
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{
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MemoryHeap::InitFreeSpace(_MenuetFreeSpace);
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_MenuetMemBlock = MemoryHeap::CreateBlock(begin, end, _MenuetFreeSpace);
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unsigned int use_beg = (unsigned int)MemoryHeap::BlockBegin(_MenuetMemBlock) +
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MemoryHeap::BlockAddSize - MemoryHeap::BlockEndSize;
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unsigned int use_size = (unsigned int)use_end;
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if (use_size <= use_beg) return 0;
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else use_size -= use_beg;
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return MemoryHeap::Alloc(_MenuetFreeSpace, use_size);
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}
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bool _SetUseMemory(unsigned int use_mem);
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int _RecalculateUseMemory(unsigned int use_mem);
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void *Alloc(unsigned int size)
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{
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if (!size) return 0;
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Lock(&_MemHeapMutex);
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void *res = MemoryHeap::Alloc(_MenuetFreeSpace, size);
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if (!res)
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{
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unsigned use_mem = (unsigned int)MemoryHeap::BlockEndFor(_MenuetMemBlock, size);
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if (_SetUseMemory(_RecalculateUseMemory(use_mem)))
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{
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res = MemoryHeap::Alloc(_MenuetFreeSpace, size);
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}
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}
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UnLock(&_MemHeapMutex);
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return res;
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}
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void *ReAlloc(void *mem, unsigned int size)
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{
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Lock(&_MemHeapMutex);
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void *res = MemoryHeap::ReAlloc(_MenuetFreeSpace, mem, size);
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if (!res && size)
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{
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unsigned use_mem = (unsigned int)MemoryHeap::BlockEndFor(_MenuetMemBlock, size);
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if (_SetUseMemory(_RecalculateUseMemory(use_mem)))
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{
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res = MemoryHeap::ReAlloc(_MenuetFreeSpace, mem, size);
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}
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}
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UnLock(&_MemHeapMutex);
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return res;
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}
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void Free(void *mem)
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{
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Lock(&_MemHeapMutex);
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MemoryHeap::Free(_MenuetFreeSpace, mem);
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UnLock(&_MemHeapMutex);
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}
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void _FreeAndThreadFinish(void *mem, int *exit_proc_now);
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}
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#endif // def __MENUET__
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#endif // ndef __MENUET_HEAP_H_INCLUDED_
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