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Fixed race condition in the page writer: The state of the page we have

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picked might have changed while we were locking its cache. Might fix
#1931.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@24430 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2008-03-18 02:39:04 +00:00
parent 9596a089a4
commit 8b76a59a0d
1 changed files with 5 additions and 0 deletions
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5
src/system/kernel/vm/vm_page.cpp
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@ -965,6 +965,11 @@ page_writer(void* /*unused*/)
} }
InterruptsSpinLocker locker(sPageLock); InterruptsSpinLocker locker(sPageLock);
// state might have change while we were locking the cache
if (page->state != PAGE_STATE_MODIFIED)
continue;
remove_page_from_queue(&sModifiedPageQueue, page); remove_page_from_queue(&sModifiedPageQueue, page);
page->state = PAGE_STATE_BUSY; page->state = PAGE_STATE_BUSY;
page->busy_writing = true; page->busy_writing = true;