| /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying |
| file Copyright.txt or https://cmake.org/licensing for details. */ |
| #include <windows.h> // CreateFileW |
| |
| #include "cmFileLock.h" |
| #include "cmSystemTools.h" |
| |
| cmFileLock::cmFileLock() |
| { |
| } |
| |
| cmFileLockResult cmFileLock::Release() |
| { |
| if (this->Filename.empty()) { |
| return cmFileLockResult::MakeOk(); |
| } |
| const unsigned long len = static_cast<unsigned long>(-1); |
| static OVERLAPPED overlapped; |
| const DWORD reserved = 0; |
| const BOOL unlockResult = |
| UnlockFileEx(File, reserved, len, len, &overlapped); |
| |
| this->Filename = ""; |
| |
| CloseHandle(this->File); |
| this->File = INVALID_HANDLE_VALUE; |
| |
| if (unlockResult) { |
| return cmFileLockResult::MakeOk(); |
| } else { |
| return cmFileLockResult::MakeSystem(); |
| } |
| } |
| |
| cmFileLockResult cmFileLock::OpenFile() |
| { |
| const DWORD access = GENERIC_READ | GENERIC_WRITE; |
| const DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE; |
| const PSECURITY_ATTRIBUTES security = NULL; |
| const DWORD attr = 0; |
| const HANDLE templ = NULL; |
| this->File = CreateFileW( |
| cmSystemTools::ConvertToWindowsExtendedPath(this->Filename).c_str(), |
| access, shareMode, security, OPEN_EXISTING, attr, templ); |
| if (this->File == INVALID_HANDLE_VALUE) { |
| return cmFileLockResult::MakeSystem(); |
| } else { |
| return cmFileLockResult::MakeOk(); |
| } |
| } |
| |
| cmFileLockResult cmFileLock::LockWithoutTimeout() |
| { |
| if (!this->LockFile(LOCKFILE_EXCLUSIVE_LOCK)) { |
| return cmFileLockResult::MakeSystem(); |
| } else { |
| return cmFileLockResult::MakeOk(); |
| } |
| } |
| |
| cmFileLockResult cmFileLock::LockWithTimeout(unsigned long seconds) |
| { |
| const DWORD flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY; |
| while (true) { |
| const BOOL result = this->LockFile(flags); |
| if (result) { |
| return cmFileLockResult::MakeOk(); |
| } |
| const DWORD error = GetLastError(); |
| if (error != ERROR_LOCK_VIOLATION) { |
| return cmFileLockResult::MakeSystem(); |
| } |
| if (seconds == 0) { |
| return cmFileLockResult::MakeTimeout(); |
| } |
| --seconds; |
| cmSystemTools::Delay(1000); |
| } |
| } |
| |
| BOOL cmFileLock::LockFile(DWORD flags) |
| { |
| const DWORD reserved = 0; |
| const unsigned long len = static_cast<unsigned long>(-1); |
| static OVERLAPPED overlapped; |
| return LockFileEx(this->File, flags, reserved, len, len, &overlapped); |
| } |