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src/libstore/pathlocks.hh
57 строк
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Dylan Green
Pathlocks Implementation for Windows (#10586)
22 апр 2024, 18:08
Не верифицирован
22 апр 2024, 18:08
aa16530
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#pragma once ///@file #include "file-descriptor.hh" namespace nix { /** * Open (possibly create) a lock file and return the file descriptor. * -1 is returned if create is false and the lock could not be opened * because it doesn't exist. Any other error throws an exception. */ AutoCloseFD openLockFile(const Path & path, bool create); /** * Delete an open lock file. */ void deleteLockFile(const Path & path, Descriptor desc); enum LockType { ltRead, ltWrite, ltNone }; bool lockFile(Descriptor desc, LockType lockType, bool wait); class PathLocks { private: typedef std::pair<Descriptor, Path> FDPair; std::list<FDPair> fds; bool deletePaths; public: PathLocks(); PathLocks(const PathSet & paths, const std::string & waitMsg = ""); bool lockPaths(const PathSet & _paths, const std::string & waitMsg = "", bool wait = true); ~PathLocks(); void unlock(); void setDeletion(bool deletePaths); }; struct FdLock { Descriptor desc; bool acquired = false; FdLock(Descriptor desc, LockType lockType, bool wait, std::string_view waitMsg); ~FdLock() { if (acquired) lockFile(desc, ltNone, false); } }; }