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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmFileLock.h"
#include "cmSystemTools.h"
#include <windows.h> // CreateFileW
cmFileLock::cmFileLock()
: File(INVALID_HANDLE_VALUE)
{
}
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);
}
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