80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
//===-- LockFileWindows.cpp -------------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "lldb/Host/windows/LockFileWindows.h"
|
|
|
|
#include <io.h>
|
|
|
|
using namespace lldb;
|
|
using namespace lldb_private;
|
|
|
|
namespace {
|
|
|
|
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();
|
|
}
|
|
|
|
} // namespace
|
|
|
|
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();
|
|
}
|