diff options
Diffstat (limited to 'ext/standard/lcg.c')
| -rw-r--r-- | ext/standard/lcg.c | 126 |
1 files changed, 0 insertions, 126 deletions
diff --git a/ext/standard/lcg.c b/ext/standard/lcg.c deleted file mode 100644 index 2683c789ce..0000000000 --- a/ext/standard/lcg.c +++ /dev/null @@ -1,126 +0,0 @@ -/* - +----------------------------------------------------------------------+ - | PHP Version 4 | - +----------------------------------------------------------------------+ - | Copyright (c) 1997-2002 The PHP Group | - +----------------------------------------------------------------------+ - | This source file is subject to version 2.02 of the PHP license, | - | that is bundled with this package in the file LICENSE, and is | - | available at through the world-wide-web at | - | http://www.php.net/license/2_02.txt. | - | If you did not receive a copy of the PHP license and are unable to | - | obtain it through the world-wide-web, please send a note to | - | license@php.net so we can mail you a copy immediately. | - +----------------------------------------------------------------------+ - | Author: Sascha Schumann <sascha@schumann.cx> | - +----------------------------------------------------------------------+ -*/ - -/* $Id$ */ - -#include "php.h" -#include "php_lcg.h" - -#if HAVE_UNISTD_H -#include <unistd.h> -#endif - -#ifdef PHP_WIN32 -#include "win32/time.h" -#else -#include <sys/time.h> -#endif - -#ifdef ZTS -int lcg_globals_id; -#else -static php_lcg_globals lcg_globals; -#endif - - -#ifdef PHP_WIN32 -#include <process.h> -#endif - -/* - * combinedLCG() returns a pseudo random number in the range of (0, 1). - * The function combines two CGs with periods of - * 2^31 - 85 and 2^31 - 249. The period of this function - * is equal to the product of both primes. - */ - -#define MODMULT(a, b, c, m, s) q = s/a;s=b*(s-a*q)-c*q;if(s<0)s+=m - -PHPAPI double php_combined_lcg(TSRMLS_D) -{ - php_int32 q; - php_int32 z; - - MODMULT(53668, 40014, 12211, 2147483563L, LCG(s1)); - MODMULT(52774, 40692, 3791, 2147483399L, LCG(s2)); - - z = LCG(s1) - LCG(s2); - if (z < 1) { - z += 2147483562; - } - - return z * 4.656613e-10; -} - -static void lcg_seed(TSRMLS_D) -{ - struct timeval tv; - - if (gettimeofday(&tv, NULL) == 0) { - LCG(s1) = tv.tv_sec ^ (~tv.tv_usec); - } else { - LCG(s1) = 1; - } -#ifdef ZTS - LCG(s2) = (long) tsrm_thread_id(); -#else - LCG(s2) = (long) getpid(); -#endif - - LCG(seeded) = 1; -} - -static void lcg_init_globals(php_lcg_globals *lcg_globals_p TSRMLS_DC) -{ - LCG(seeded) = 0; -} - -PHP_MINIT_FUNCTION(lcg) -{ -#ifdef ZTS - ts_allocate_id(&lcg_globals_id, sizeof(php_lcg_globals), (ts_allocate_ctor) lcg_init_globals, NULL); -#else - lcg_init_globals(&lcg_globals); -#endif - return SUCCESS; -} - -PHP_RINIT_FUNCTION(lcg) -{ - if (!LCG(seeded)) { - lcg_seed(TSRMLS_C); - } - return SUCCESS; -} - -/* {{{ proto float lcg_value() - Returns a value from the combined linear congruential generator */ -PHP_FUNCTION(lcg_value) -{ - RETURN_DOUBLE(php_combined_lcg(TSRMLS_C)); -} -/* }}} */ - -/* - * Local variables: - * tab-width: 4 - * c-basic-offset: 4 - * End: - * vim600: sw=4 ts=4 fdm=marker - * vim<600: sw=4 ts=4 - */ |