1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/* 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 = nullptr;
const DWORD attr = 0;
const HANDLE templ = nullptr;
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);
}
}
int cmFileLock::LockFile(int 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);
}
|
