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/* -*- Mode: C++ -*- * Worldvisions Weaver Software: * Copyright (C) 1997-2002 Net Integration Technologies, Inc. * * A simple lockfile class using WvStreams. */ #ifndef __WVLOCKFILE_H #define __WVLOCKFILE_H #include "wvfile.h" class WvLockFile { public: WvLockFile(WvStringParm _lockname); /** Check to make sure no lock is established or that it's owned by us. */ bool isok(); /** Creates the lockfile with the current pid. Returns success/failure. */ bool lock(); /** * Removes the lockfile if present. If there's no lockfile after, * returns true, otherwise false. */ bool unlock(); /** * Returns one of three things: * -1 if the lockfile exists, but is inaccessible. * 0 if there is no lockfile, or the process is not running. * >0 The pid of the known-running process that owns the lock. */ pid_t readpid(); protected: WvString lockname; }; #endif // __WVLOCKFILE_H