39 lines
965 B
C++
39 lines
965 B
C++
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#include "areaPool.h"
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#include "area.h"
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#include "page.h"
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#include "vmHeaderBlock.h"
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#include "pageManager.h"
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extern vmHeaderBlock *vmBlock;
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area *poolarea::get(void)
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{
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area *ret=NULL;
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if (unused.count())
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{
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//printf ("poolarea::get: Getting an unused one!\n");
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acquire_sem(inUse);
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ret=(area *)unused.next();
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release_sem(inUse);
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}
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if (ret)
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{
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//printf ("poolarea::get: Returning address:%x \n",ret);
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return ret;
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}
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else
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{
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//printf ("poolarea::get: Getting a new page!\n");
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page *newPage=vmBlock->pageMan->getPage();
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if (!newPage)
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throw ("Out of pages to allocate a pool!");
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int newCount=PAGE_SIZE/sizeof(area);
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acquire_sem(inUse);
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//printf ("poolarea::get: Adding %d new elements to the pool!\n",newCount);
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for (int i=0;i<newCount;i++)
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unused.add(((void *)(newPage->getAddress()+(i*sizeof(area)))));
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release_sem(inUse);
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return (get()); // A little cheat - call self again to get the first one from stack...
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}
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}
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