1 /* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
2 file Copyright.txt or https://cmake.org/licensing for details. */
3 #include <windows.h> // CreateFileW
5 #include "cmFileLock.h"
6 #include "cmSystemTools.h"
8 cmFileLock::cmFileLock()
12 cmFileLockResult cmFileLock::Release()
14 if (this->Filename.empty()) {
15 return cmFileLockResult::MakeOk();
17 const unsigned long len = static_cast<unsigned long>(-1);
18 static OVERLAPPED overlapped;
19 const DWORD reserved = 0;
20 const BOOL unlockResult =
21 UnlockFileEx(File, reserved, len, len, &overlapped);
25 CloseHandle(this->File);
26 this->File = INVALID_HANDLE_VALUE;
29 return cmFileLockResult::MakeOk();
31 return cmFileLockResult::MakeSystem();
35 cmFileLockResult cmFileLock::OpenFile()
37 const DWORD access = GENERIC_READ | GENERIC_WRITE;
38 const DWORD shareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
39 const PSECURITY_ATTRIBUTES security = NULL;
41 const HANDLE templ = NULL;
42 this->File = CreateFileW(
43 cmSystemTools::ConvertToWindowsExtendedPath(this->Filename).c_str(),
44 access, shareMode, security, OPEN_EXISTING, attr, templ);
45 if (this->File == INVALID_HANDLE_VALUE) {
46 return cmFileLockResult::MakeSystem();
48 return cmFileLockResult::MakeOk();
52 cmFileLockResult cmFileLock::LockWithoutTimeout()
54 if (!this->LockFile(LOCKFILE_EXCLUSIVE_LOCK)) {
55 return cmFileLockResult::MakeSystem();
57 return cmFileLockResult::MakeOk();
61 cmFileLockResult cmFileLock::LockWithTimeout(unsigned long seconds)
63 const DWORD flags = LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY;
65 const BOOL result = this->LockFile(flags);
67 return cmFileLockResult::MakeOk();
69 const DWORD error = GetLastError();
70 if (error != ERROR_LOCK_VIOLATION) {
71 return cmFileLockResult::MakeSystem();
74 return cmFileLockResult::MakeTimeout();
77 cmSystemTools::Delay(1000);
81 BOOL cmFileLock::LockFile(DWORD flags)
83 const DWORD reserved = 0;
84 const unsigned long len = static_cast<unsigned long>(-1);
85 static OVERLAPPED overlapped;
86 return LockFileEx(this->File, flags, reserved, len, len, &overlapped);