| //===-- LockFileWindows.cpp -----------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "lldb/Host/windows/LockFileWindows.h" |
| |
| #include <io.h> |
| |
| using namespace lldb; |
| using namespace lldb_private; |
| |
| static Status fileLock(HANDLE file_handle, DWORD flags, const uint64_t start, |
| const uint64_t len) { |
| if (start != 0) |
| return Status("Non-zero start lock regions are not supported"); |
| |
| OVERLAPPED overlapped = {}; |
| |
| if (!::LockFileEx(file_handle, flags, 0, len, 0, &overlapped) && |
| ::GetLastError() != ERROR_IO_PENDING) |
| return Status(::GetLastError(), eErrorTypeWin32); |
| |
| DWORD bytes; |
| if (!::GetOverlappedResult(file_handle, &overlapped, &bytes, TRUE)) |
| return Status(::GetLastError(), eErrorTypeWin32); |
| |
| return Status(); |
| } |
| |
| LockFileWindows::LockFileWindows(int fd) |
| : LockFileBase(fd), m_file(reinterpret_cast<HANDLE>(_get_osfhandle(fd))) {} |
| |
| LockFileWindows::~LockFileWindows() { Unlock(); } |
| |
| bool LockFileWindows::IsValidFile() const { |
| return LockFileBase::IsValidFile() && m_file != INVALID_HANDLE_VALUE; |
| } |
| |
| Status LockFileWindows::DoWriteLock(const uint64_t start, const uint64_t len) { |
| return fileLock(m_file, LOCKFILE_EXCLUSIVE_LOCK, start, len); |
| } |
| |
| Status LockFileWindows::DoTryWriteLock(const uint64_t start, |
| const uint64_t len) { |
| return fileLock(m_file, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, |
| start, len); |
| } |
| |
| Status LockFileWindows::DoReadLock(const uint64_t start, const uint64_t len) { |
| return fileLock(m_file, 0, start, len); |
| } |
| |
| Status LockFileWindows::DoTryReadLock(const uint64_t start, |
| const uint64_t len) { |
| return fileLock(m_file, LOCKFILE_FAIL_IMMEDIATELY, start, len); |
| } |
| |
| Status LockFileWindows::DoUnlock() { |
| OVERLAPPED overlapped = {}; |
| |
| if (!::UnlockFileEx(m_file, 0, m_len, 0, &overlapped) && |
| ::GetLastError() != ERROR_IO_PENDING) |
| return Status(::GetLastError(), eErrorTypeWin32); |
| |
| DWORD bytes; |
| if (!::GetOverlappedResult(m_file, &overlapped, &bytes, TRUE)) |
| return Status(::GetLastError(), eErrorTypeWin32); |
| |
| return Status(); |
| } |