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