| 31 | } |
| 32 | |
| 33 | auto FileDescriptorTable::operator=(FileDescriptorTable&& other) |
| 34 | -> FileDescriptorTable& { |
| 35 | if (this != &other) { |
| 36 | // 先关闭当前的所有文件 |
| 37 | CloseAll().or_else([](auto&& err) { |
| 38 | klog::Warn("Failed to close all files in move assignment: {}", |
| 39 | err.message()); |
| 40 | return Expected<void>{}; |
| 41 | }); |
| 42 | |
| 43 | // 使用地址确定加锁顺序，避免死锁 |
| 44 | auto* first_lock = (this < &other) ? &lock_ : &other.lock_; |
| 45 | auto* second_lock = (this < &other) ? &other.lock_ : &lock_; |
| 46 | LockGuard guard1(*first_lock); |
| 47 | LockGuard guard2(*second_lock); |
| 48 | |
| 49 | for (int i = 0; i < kMaxFd; ++i) { |
| 50 | table_[i] = other.table_[i]; |
| 51 | other.table_[i] = nullptr; |
| 52 | } |
| 53 | |
| 54 | open_count_ = other.open_count_; |
| 55 | other.open_count_ = 0; |
| 56 | } |
| 57 | |
| 58 | return *this; |
| 59 | } |
| 60 | |
| 61 | auto FileDescriptorTable::Alloc(vfs::File* file) -> Expected<int> { |
| 62 | if (file == nullptr) { |