0c9c4be4ae
* bin/common_cout.cc (check_cout): Force a flush of cout if more than 20ms has elapsed since the last explicit flush. * bin/common_setup.cc (setup): Untie cin and cout if the input is not a TTY, so that cout is flush less often. * NEWS: Mention the change.
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2012, 2016 Laboratoire de Recherche et Développement de
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// l'Epita (LRDE).
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "common_sys.hh"
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#include "common_cout.hh"
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#include <iostream>
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#include <chrono>
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#include "error.h"
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namespace
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{
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static std::chrono::steady_clock::time_point last_flush;
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static void do_check_cout()
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{
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// Make sure we abort if we can't write to std::cout anymore
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// (like disk full or broken pipe with SIGPIPE ignored).
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if (!std::cout)
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error(2, 0, "error writing to standard output");
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}
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}
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void check_cout()
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{
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// If we haven't flushed explicitly for more than 20ms, do it now.
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// Otherwise we would have to wait for the buffer to fill up, and
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// this could take a long time.
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auto now = std::chrono::steady_clock::now();
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auto ms =
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std::chrono::duration_cast<std::chrono::milliseconds>(now - last_flush);
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if (ms.count() >= 20)
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{
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last_flush = now;
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std::cout.flush();
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}
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do_check_cout();
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}
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void flush_cout()
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{
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last_flush = std::chrono::steady_clock::now();
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std::cout.flush();
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do_check_cout();
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}
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