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#pragma once
#include "libutil/util.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, int fd);
enum LockType { ltRead, ltWrite, ltNone };
bool lockFile(int fd, LockType lockType, bool wait);
class PathLocks {
private:
typedef std::pair<int, 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);
};
} // namespace nix
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