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9bbc195d11
`zend_strtod.c` uses a global state (mostly an allocation freelist) protected by a mutex in ZTS builds. This state is used by `zend_dtoa()`, `zend_strtod()`, and variants. This creates a lot of contention in concurrent loads. `zend_dtoa()` is used to format floats to string, e.g. in sprintf, json_encode, serialize, uniqid. Here I move the global state to the thread specific `executor_globals` and remove the mutex. The impact on non-concurrent environments is null or negligible, but there is a considerable speed up on concurrent environments, especially on Alpine/Musl.
52 lines
2.3 KiB
C
52 lines
2.3 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Derick Rethans <derick@php.net> |
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+----------------------------------------------------------------------+
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*/
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/* This is a header file for the strtod implementation by David M. Gay which
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* can be found in zend_strtod.c */
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#ifndef ZEND_STRTOD_H
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#define ZEND_STRTOD_H
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#include <zend.h>
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BEGIN_EXTERN_C()
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#define ZEND_STRTOD_K_MAX 7
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typedef struct _zend_strtod_bigint zend_strtod_bigint;
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typedef struct _zend_strtod_state {
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zend_strtod_bigint *freelist[ZEND_STRTOD_K_MAX+1];
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zend_strtod_bigint *p5s;
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char *result;
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} zend_strtod_state;
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ZEND_API void zend_freedtoa(char *s);
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ZEND_API char *zend_dtoa(double _d, int mode, int ndigits, int *decpt, bool *sign, char **rve);
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ZEND_API char *zend_gcvt(double value, int ndigit, char dec_point, char exponent, char *buf);
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ZEND_API double zend_strtod(const char *s00, const char **se);
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ZEND_API double zend_hex_strtod(const char *str, const char **endptr);
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ZEND_API double zend_oct_strtod(const char *str, const char **endptr);
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ZEND_API double zend_bin_strtod(const char *str, const char **endptr);
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ZEND_API int zend_shutdown_strtod(void);
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END_EXTERN_C()
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/* double limits */
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#include <float.h>
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#if defined(DBL_MANT_DIG) && defined(DBL_MIN_EXP)
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#define ZEND_DOUBLE_MAX_LENGTH (3 + DBL_MANT_DIG - DBL_MIN_EXP)
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#else
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#define ZEND_DOUBLE_MAX_LENGTH 1080
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#endif
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#endif
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