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kolibrios/programs/demos/life2/include/me_heap.h
Yogev Ezra 2bf6bb3b5b Added sources of life2 demo to SVN.
git-svn-id: svn://kolibrios.org@1769 a494cfbc-eb01-0410-851d-a64ba20cac60
2011-01-28 13:00:06 +00:00

91 lines
2.2 KiB
C++

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