// $Id$ -*- C++ -*- // Block signals for the lifetime of this object (protect critical sections) // Copyright (C) 1996 Technische Universitaet Braunschweig, Germany. // Written by Andreas Zeller <zeller@gnu.org>. // // This file is part of DDD. // // DDD is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public // License as published by the Free Software Foundation; either // version 3 of the License, or (at your option) any later version. // // DDD is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. // See the GNU General Public License for more details. // // You should have received a copy of the GNU General Public // License along with DDD -- see the file COPYING. // If not, see <http://www.gnu.org/licenses/>. // // DDD is the data display debugger. // For details, see the DDD World-Wide-Web page, // `http://www.gnu.org/software/ddd/', // or send a mail to the DDD developers <ddd@gnu.org>. #ifndef _DDD_SignalBlocker_h #define _DDD_SignalBlocker_h #include <sys/types.h> #include <signal.h> #include "assert.h" // A SignalBlocker is used to protect critical sections: // // { // SignalBlocker sb(<signal name>); // ... critical section protected against <signal name>... // } // // For instance, to protect a critical section against SIGCHLD signals, // you would write: // // { // SignalBlocker sb(SIGCHLD); // ... critical section ... // } // // A SignalBlocker without arguments blocks all signals. class SignalBlocker { private: #ifdef SIG_SETMASK sigset_t old_set; // POSIX interface #else int old_mask; // BSD interface #endif // No assignments and copies SignalBlocker& operator = (const SignalBlocker&); SignalBlocker(const SignalBlocker&); public: // Constructor - block signal SIGNUM SignalBlocker(int signum); // Constructor - block all signals SignalBlocker(); // Destructor - restore state ~SignalBlocker(); }; #endif // _DDD_SignalBlocker_h // DON'T ADD ANYTHING BEHIND THIS #endif