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libzmq master
The Intelligent Transport Layer
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00001 /* 00002 Copyright (c) 2011 250bpm s.r.o. 00003 Copyright (c) 2011 Other contributors as noted in the AUTHORS file 00004 00005 This file is part of 0MQ. 00006 00007 0MQ is free software; you can redistribute it and/or modify it under 00008 the terms of the GNU Lesser General Public License as published by 00009 the Free Software Foundation; either version 3 of the License, or 00010 (at your option) any later version. 00011 00012 0MQ is distributed in the hope that it will be useful, 00013 but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 GNU Lesser General Public License for more details. 00016 00017 You should have received a copy of the GNU Lesser General Public License 00018 along with this program. If not, see <http://www.gnu.org/licenses/>. 00019 */ 00020 00021 #include <stdlib.h> 00022 00023 #include "platform.hpp" 00024 #if defined ZMQ_HAVE_WINDOWS 00025 #include "windows.hpp" 00026 #else 00027 #include <unistd.h> 00028 #endif 00029 00030 #include "random.hpp" 00031 #include "stdint.hpp" 00032 #include "clock.hpp" 00033 00034 void zmq::seed_random () 00035 { 00036 #if defined ZMQ_HAVE_WINDOWS 00037 int pid = (int) GetCurrentProcessId (); 00038 #else 00039 int pid = (int) getpid (); 00040 #endif 00041 srand ((unsigned int) (clock_t::now_us () + pid)); 00042 } 00043 00044 uint32_t zmq::generate_random () 00045 { 00046 // Compensate for the fact that rand() returns signed integer. 00047 uint32_t low = (uint32_t) rand (); 00048 uint32_t high = (uint32_t) rand (); 00049 high <<= (sizeof (int) * 8 - 1); 00050 return high | low; 00051 } 00052