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53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*
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Copyright (c) 2011 250bpm s.r.o.
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Copyright (c) 2011 Other contributors as noted in the AUTHORS file
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser 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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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include "platform.hpp"
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#if defined ZMQ_HAVE_WINDOWS
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#include "windows.hpp"
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#else
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#include <unistd.h>
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#endif
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#include "random.hpp"
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#include "stdint.hpp"
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#include "clock.hpp"
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void zmq::seed_random ()
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{
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#if defined ZMQ_HAVE_WINDOWS
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int pid = (int) GetCurrentProcessId ();
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#else
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int pid = (int) getpid ();
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#endif
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srand ((unsigned int) (clock_t::now_us () + pid));
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}
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uint32_t zmq::generate_random ()
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{
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// Compensate for the fact that rand() returns signed integer.
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uint32_t low = (uint32_t) rand ();
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uint32_t high = (uint32_t) rand ();
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high <<= (sizeof (int) * 8 - 1);
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return high | low;
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}
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