70 lines
2.6 KiB
C
70 lines
2.6 KiB
C
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/*
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* GMEM.H - Macros for windows 3.0 memory management in protected mode
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*
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* because windows 3.0 runs in pmode GlobalLock and GlobalUnlock are
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* unnessary. The "Selector" to a memory object will always be the
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* same for the life of the memory object.
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*
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* these macros take advantage of the following win3 memory "facts"
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*
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* a SELECTOR (to a global object) is a HANDLE
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* a HANDLE is *not* a SELECTOR!!!!!!!!
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*
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* GlobalLock() and GlobalUnlock() do *not* keep lock counts
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*
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* GlobalLock() is the only way to convert a HANDLE to a SELECTOR
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*
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* functions:
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*
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* GHandle(sel) convert a SELECTOR to a HANDLE
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* GSelector(h) convert a HANDLE to a SELECTOR
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*
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* GAllocSel(ulBytes) allocate a SELECTOR ulBytes in size
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* GAllocPtr(ulBytes) allocate a POINTER ulBytes in size
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*
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* GReAllocSel(sel,ulBytes) re-alloc a SELECTOR
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* GReAllocPtr(lp,ulBytes) re-alloc a POINTER
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*
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* GSizeSel(sel) return the size in bytes of a SELECTOR
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*
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* GLockSel(sel) convert a SELECTOR into a POINTER
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* GUnlockSel(sel) does nothing
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*
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* GFreeSel(sel) free a SELECTOR
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* GFreePtr(lp) free a POINTER
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*
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* 5/31/90 ToddLa
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*
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*/
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HGLOBAL __H;
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#define MAKEP(sel,off) ((LPVOID)MAKELONG(off,sel))
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#define GHandle(sel) ((HGLOBAL)(sel)) /* GlobalHandle? */
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#define GSelector(h) (HIWORD((DWORD)GlobalLock(h)))
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#define GAllocSelF(f,ulBytes) ((__H=GlobalAlloc(f,(LONG)(ulBytes))) ? GSelector(__H) : NULL )
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#define GAllocPtrF(f,ulBytes) MAKEP(GAllocSelF(f,ulBytes),0)
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#define GAllocF(f,ulBytes) GAllocSelF(f,ulBytes)
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#define GAllocSel(ulBytes) GAllocSelF(GMEM_MOVEABLE,ulBytes)
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#define GAllocPtr(ulBytes) GAllocPtrF(GMEM_MOVEABLE,ulBytes)
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#define GAlloc(ulBytes) GAllocSelF(GMEM_MOVEABLE,ulBytes)
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#define GReAllocSel(sel,ulBytes) ((__H=GlobalReAlloc((HGLOBAL)(sel),(LONG)(ulBytes), GMEM_MOVEABLE | GMEM_ZEROINIT)) ? GSelector(__H) : NULL )
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#define GReAllocPtr(lp,ulBytes) MAKEP(GReAllocSel(HIWORD((DWORD)(lp)),ulBytes),0)
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#define GReAlloc(sel,ulBytes) GReAllocSel(sel,ulBytes)
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#define GSizeSel(sel) GlobalSize((HGLOBAL)(sel))
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#define GSize(sel) GSizeSel(sel)
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#define GLockSel(sel) MAKEP(sel,0)
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#define GUnlockSel(sel) /* nothing */
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#define GLock(sel) GLockSel(sel)
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#define GUnlock(sel) GUnlockSel(sel)
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#define GFreeSel(sel) (GlobalUnlock(GHandle(sel)),GlobalFree(GHandle(sel)))
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#define GFreePtr(lp) GFreeSel(HIWORD((DWORD)(lp)))
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#define GFree(sel) GFreeSel(sel)
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