You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.5 KiB
66 lines
1.5 KiB
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
|
|
file Copyright.txt or https://cmake.org/licensing for details. */
|
|
#ifndef cmFileLock_h
|
|
#define cmFileLock_h
|
|
|
|
#include "cmConfigure.h" // IWYU pragma: keep
|
|
|
|
#include <string>
|
|
|
|
#if defined(_WIN32)
|
|
# include <windows.h> // HANDLE
|
|
#endif
|
|
|
|
class cmFileLockResult;
|
|
|
|
/**
|
|
* @brief Cross-platform file locking.
|
|
* @details Under the hood this class use 'fcntl' for Unix-like platforms and
|
|
* 'LockFileEx'/'UnlockFileEx' for Win32 platform. Locks are exclusive and
|
|
* advisory.
|
|
*/
|
|
class cmFileLock
|
|
{
|
|
CM_DISABLE_COPY(cmFileLock)
|
|
|
|
public:
|
|
cmFileLock();
|
|
~cmFileLock();
|
|
|
|
/**
|
|
* @brief Lock the file.
|
|
* @param timeoutSec Lock timeout. If -1 try until success or fatal error.
|
|
*/
|
|
cmFileLockResult Lock(const std::string& filename, unsigned long timeoutSec);
|
|
|
|
/**
|
|
* @brief Unlock the file.
|
|
*/
|
|
cmFileLockResult Release();
|
|
|
|
/**
|
|
* @brief Check file is locked by this class.
|
|
* @details This function helps to find double locks (deadlocks) and to do
|
|
* explicit unlocks.
|
|
*/
|
|
bool IsLocked(const std::string& filename) const;
|
|
|
|
private:
|
|
cmFileLockResult OpenFile();
|
|
cmFileLockResult LockWithoutTimeout();
|
|
cmFileLockResult LockWithTimeout(unsigned long timeoutSec);
|
|
|
|
#if defined(_WIN32)
|
|
typedef HANDLE FileId;
|
|
BOOL LockFile(DWORD flags);
|
|
#else
|
|
typedef int FileId;
|
|
int LockFile(int cmd, int type);
|
|
#endif
|
|
|
|
FileId File;
|
|
std::string Filename;
|
|
};
|
|
|
|
#endif // cmFileLock_h
|