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66 lines
1.5 KiB
C++
66 lines
1.5 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#ifndef cmFileLock_h
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#define cmFileLock_h
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#include "cmConfigure.h" // IWYU pragma: keep
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#include <string>
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#if defined(_WIN32)
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# include <windows.h> // HANDLE
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#endif
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class cmFileLockResult;
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/**
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* @brief Cross-platform file locking.
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* @details Under the hood this class use 'fcntl' for Unix-like platforms and
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* 'LockFileEx'/'UnlockFileEx' for Win32 platform. Locks are exclusive and
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* advisory.
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*/
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class cmFileLock
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{
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public:
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cmFileLock();
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~cmFileLock();
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cmFileLock(cmFileLock const&) = delete;
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cmFileLock& operator=(cmFileLock const&) = delete;
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/**
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* @brief Lock the file.
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* @param timeoutSec Lock timeout. If -1 try until success or fatal error.
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*/
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cmFileLockResult Lock(const std::string& filename, unsigned long timeoutSec);
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/**
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* @brief Unlock the file.
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*/
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cmFileLockResult Release();
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/**
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* @brief Check file is locked by this class.
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* @details This function helps to find double locks (deadlocks) and to do
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* explicit unlocks.
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*/
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bool IsLocked(const std::string& filename) const;
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private:
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cmFileLockResult OpenFile();
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cmFileLockResult LockWithoutTimeout();
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cmFileLockResult LockWithTimeout(unsigned long timeoutSec);
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#if defined(_WIN32)
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HANDLE File = INVALID_HANDLE_VALUE;
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BOOL LockFile(DWORD flags);
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#else
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int File = -1;
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int LockFile(int cmd, int type);
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#endif
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std::string Filename;
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};
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#endif // cmFileLock_h
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