Michael Phipps
afea942ffa
pageManager still needs special treatment. git-svn-id: file:///srv/svn/repos/haiku/trunk/current@890 a95241bf-73f2-0310-859d-f6bbb57e9c96
52 lines
1.1 KiB
C++
52 lines
1.1 KiB
C++
#include "pageManager.h"
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extern pageManager pageMan;
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class poolvnode
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{
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private:
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list unused;
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sem_id inUse;
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public:
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poolvnode(void)
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{
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inUse = create_sem(1,"vnodepool");
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}
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vnode *get(void)
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{
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vnode *ret=NULL;
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if (unused.count())
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{
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//printf ("poolvnode::get: Getting an unused one!\n");
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acquire_sem(inUse);
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ret=(vnode *)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 ("poolvnode::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 ("poolvnode::get: Getting a new page!\n");
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page *newPage=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(vnode);
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acquire_sem(inUse);
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//printf ("poolvnode::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(vnode)))));
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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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void put(vnode *in)
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{
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acquire_sem(inUse);
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unused.add(in);
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release_sem(inUse);
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}
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};
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