| /* |
| * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef WTF_RandomNumberSeed_h |
| #define WTF_RandomNumberSeed_h |
| |
| #include <stdlib.h> |
| #include <time.h> |
| |
| #if HAVE(SYS_TIME_H) |
| #include <sys/time.h> |
| #endif |
| |
| #if OS(UNIX) |
| #include <sys/types.h> |
| #include <unistd.h> |
| #endif |
| |
| #if USE(MERSENNE_TWISTER_19937) |
| extern "C" { |
| void init_by_array(unsigned long init_key[],int key_length); |
| } |
| #endif |
| |
| // Internal JavaScriptCore usage only |
| namespace WTF { |
| |
| inline void initializeRandomNumberGenerator() |
| { |
| #if OS(DARWIN) |
| // On Darwin we use arc4random which initialises itself. |
| #elif OS(WINCE) |
| // initialize rand() |
| srand(GetTickCount()); |
| #elif COMPILER(MSVC) && defined(_CRT_RAND_S) |
| // On Windows we use rand_s which initialises itself |
| #elif OS(UNIX) && !defined(__LB_SHELL__) |
| // srandomdev is not guaranteed to exist on linux so we use this poor seed, this should be improved |
| timeval time; |
| gettimeofday(&time, 0); |
| srandom(static_cast<unsigned>(time.tv_usec * getpid())); |
| #elif OS(STARBOARD) |
| // Starboard's random initializes itself. |
| #else |
| srand(static_cast<unsigned>(time(0))); |
| #endif |
| |
| #if USE(MERSENNE_TWISTER_19937) |
| // use rand() to initialize the Mersenne Twister random number generator. |
| unsigned long initializationBuffer[4]; |
| initializationBuffer[0] = (rand() << 16) | rand(); |
| initializationBuffer[1] = (rand() << 16) | rand(); |
| initializationBuffer[2] = (rand() << 16) | rand(); |
| initializationBuffer[3] = (rand() << 16) | rand(); |
| init_by_array(initializationBuffer, 4); |
| #endif |
| } |
| |
| } |
| |
| #endif |
