本文整理汇总了C++中Area::GetProtection方法的典型用法代码示例。如果您正苦于以下问题：C++ Area::GetProtection方法的具体用法？C++ Area::GetProtection怎么用？C++ Area::GetProtection使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Area的用法示例。
在下文中一共展示了Area::GetProtection方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: HandleFault
status_t AddressSpace::HandleFault(unsigned int va, bool write, bool user)
{
va &= ~(PAGE_SIZE - 1); // Round down to a page boundry.
fAreaLock.LockRead();
int lastChangeCount = fChangeCount;
Area *area = static_cast<Area*>(fAreas.Find(va));
if (area == 0) {
fAreaLock.UnlockRead();
return E_BAD_ADDRESS;
}
PageProtection protection = area->GetProtection();
if ((user && write && !(protection & USER_WRITE))
|| (user && !write && !(protection & USER_READ))
|| (!user && write && !(protection & SYSTEM_WRITE))
|| (!user && !write && !(protection & SYSTEM_READ))) {
fAreaLock.UnlockRead();
return E_NOT_ALLOWED;
}
PageCache *cache = area->GetPageCache();
if (cache == 0) {
fAreaLock.UnlockRead();
return E_NOT_ALLOWED;
}
bool copy = cache->IsCopy();
cache->AcquireRef();
fAreaLock.UnlockRead();
off_t offset = va - area->GetBaseAddress() + area->GetCacheOffset();
Page *page = cache->GetPage(offset, write && cache->IsCopy());
cache->ReleaseRef();
if (page == 0)
return E_IO;
fAreaLock.LockRead();
if (lastChangeCount != fChangeCount) {
// Changes have occured to this address. Make sure that
// the area hasn't changed underneath the fault handler.
Area *newArea = static_cast<Area*>(fAreas.Find(va));
if (newArea != area || newArea->GetPageCache() != cache ||
newArea->GetCacheOffset() != offset)
fAreaLock.UnlockRead();
return E_BAD_ADDRESS;
}
// If this is a read from copy-on-write page, it is shared with the
// original cache. Mark it read only.
if (copy && !write)
protection &= ~(USER_WRITE | SYSTEM_WRITE);
fPhysicalMap->Map(va, page->GetPhysicalAddress(), protection);
fAreaLock.UnlockRead();
AtomicAdd(&fFaultCount, 1);
return E_NO_ERROR;
}