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1ab4520c30
Extend the zend_atomic API for ints. Also add `zend_atomic_*_compare_exchange()`, `ZEND_ATOMIC_*_INITIALIZER()`.
391 lines
13 KiB
C
391 lines
13 KiB
C
/*
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP 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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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP 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@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Levi Morrison <morrison.levi@gmail.com> |
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+----------------------------------------------------------------------+
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*/
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#ifndef ZEND_ATOMIC_H
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#define ZEND_ATOMIC_H
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#include "zend_portability.h"
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#include <stdbool.h>
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#define ZEND_GCC_PREREQ(x, y) \
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((__GNUC__ == (x) && __GNUC_MINOR__ >= (y)) || (__GNUC__ > (x)))
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/* Builtins are used to avoid library linkage */
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#if __has_feature(c_atomic) && defined(__clang__)
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#define HAVE_C11_ATOMICS 1
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#elif ZEND_GCC_PREREQ(4, 7)
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#define HAVE_GNUC_ATOMICS 1
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#elif defined(__GNUC__)
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#define HAVE_SYNC_ATOMICS 1
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#elif !defined(ZEND_WIN32)
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#define HAVE_NO_ATOMICS 1
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#endif
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#undef ZEND_GCC_PREREQ
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/* Treat zend_atomic_* types as opaque. They have definitions only for size
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* and alignment purposes.
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*/
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#if defined(ZEND_WIN32) || defined(HAVE_SYNC_ATOMICS)
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typedef struct zend_atomic_bool_s {
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volatile char value;
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} zend_atomic_bool;
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typedef struct zend_atomic_int_s {
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# ifdef ZEND_WIN32
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volatile long value;
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# else
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volatile int value;
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# endif
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} zend_atomic_int;
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#elif defined(HAVE_C11_ATOMICS)
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typedef struct zend_atomic_bool_s {
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_Atomic(bool) value;
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} zend_atomic_bool;
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typedef struct zend_atomic_int_s {
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_Atomic(int) value;
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} zend_atomic_int;
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#else
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typedef struct zend_atomic_bool_s {
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volatile bool value;
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} zend_atomic_bool;
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typedef struct zend_atomic_int_s {
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volatile int value;
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} zend_atomic_int;
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#endif
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BEGIN_EXTERN_C()
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#ifdef ZEND_WIN32
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#ifndef InterlockedExchange8
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#define InterlockedExchange8 _InterlockedExchange8
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#endif
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#ifndef InterlockedOr8
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#define InterlockedOr8 _InterlockedOr8
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#endif
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#ifndef InterlockedCompareExchange8
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#define InterlockedCompareExchange8 _InterlockedCompareExchange8
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#endif
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#ifndef InterlockedExchange
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#define InterlockedExchange _InterlockedExchange
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#endif
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#ifndef InterlockedOr
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#define InterlockedOr _InterlockedOr
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#endif
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#ifndef InterlockedCompareExchange
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#define InterlockedCompareExchange _InterlockedCompareExchange
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#endif
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#define ZEND_ATOMIC_BOOL_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_INT_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_BOOL_INITIALIZER(desired) {.value = (desired)}
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#define ZEND_ATOMIC_INT_INITIALIZER(desired) {.value = (desired)}
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static zend_always_inline bool zend_atomic_bool_exchange_ex(zend_atomic_bool *obj, bool desired) {
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return InterlockedExchange8(&obj->value, desired);
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}
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static zend_always_inline int zend_atomic_int_exchange_ex(zend_atomic_int *obj, int desired) {
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return (int) InterlockedExchange(&obj->value, desired);
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}
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static zend_always_inline bool zend_atomic_bool_compare_exchange_ex(zend_atomic_bool *obj, bool *expected, bool desired) {
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bool prev = (bool) InterlockedCompareExchange8(&obj->value, *expected, desired);
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if (prev == *expected) {
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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static zend_always_inline bool zend_atomic_int_compare_exchange_ex(zend_atomic_int *obj, int *expected, int desired) {
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int prev = (int) InterlockedCompareExchange(&obj->value, *expected, desired);
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if (prev == *expected) {
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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/* On this platform it is non-const due to Iterlocked API*/
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static zend_always_inline bool zend_atomic_bool_load_ex(zend_atomic_bool *obj) {
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/* Or'ing with false won't change the value. */
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return InterlockedOr8(&obj->value, false);
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}
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static zend_always_inline int zend_atomic_int_load_ex(zend_atomic_int *obj) {
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/* Or'ing with 0 won't change the value. */
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return (int) InterlockedOr(&obj->value, 0);
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}
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static zend_always_inline void zend_atomic_bool_store_ex(zend_atomic_bool *obj, bool desired) {
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(void)InterlockedExchange8(&obj->value, desired);
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}
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static zend_always_inline void zend_atomic_int_store_ex(zend_atomic_int *obj, int desired) {
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(void)InterlockedExchange(&obj->value, desired);
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}
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#elif defined(HAVE_C11_ATOMICS)
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#define ZEND_ATOMIC_BOOL_INIT(obj, desired) __c11_atomic_init(&(obj)->value, (desired))
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#define ZEND_ATOMIC_INT_INIT(obj, desired) __c11_atomic_init(&(obj)->value, (desired))
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#define ZEND_ATOMIC_BOOL_INITIALIZER(desired) {.value = (desired)}
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#define ZEND_ATOMIC_INT_INITIALIZER(desired) {.value = (desired)}
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static zend_always_inline bool zend_atomic_bool_exchange_ex(zend_atomic_bool *obj, bool desired) {
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return __c11_atomic_exchange(&obj->value, desired, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline int zend_atomic_int_exchange_ex(zend_atomic_int *obj, int desired) {
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return __c11_atomic_exchange(&obj->value, desired, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline bool zend_atomic_bool_compare_exchange_ex(zend_atomic_bool *obj, bool *expected, bool desired) {
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return __c11_atomic_compare_exchange_strong(&obj->value, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline bool zend_atomic_int_compare_exchange_ex(zend_atomic_int *obj, int *expected, int desired) {
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return __c11_atomic_compare_exchange_strong(&obj->value, expected, desired, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline bool zend_atomic_bool_load_ex(const zend_atomic_bool *obj) {
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return __c11_atomic_load(&obj->value, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline int zend_atomic_int_load_ex(const zend_atomic_int *obj) {
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return __c11_atomic_load(&obj->value, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline void zend_atomic_bool_store_ex(zend_atomic_bool *obj, bool desired) {
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__c11_atomic_store(&obj->value, desired, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline void zend_atomic_int_store_ex(zend_atomic_int *obj, int desired) {
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__c11_atomic_store(&obj->value, desired, __ATOMIC_SEQ_CST);
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}
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#elif defined(HAVE_GNUC_ATOMICS)
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/* bool */
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#define ZEND_ATOMIC_BOOL_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_INT_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_BOOL_INITIALIZER(desired) {.value = (desired)}
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#define ZEND_ATOMIC_INT_INITIALIZER(desired) {.value = (desired)}
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static zend_always_inline bool zend_atomic_bool_exchange_ex(zend_atomic_bool *obj, bool desired) {
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bool prev = false;
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__atomic_exchange(&obj->value, &desired, &prev, __ATOMIC_SEQ_CST);
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return prev;
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}
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static zend_always_inline int zend_atomic_int_exchange_ex(zend_atomic_int *obj, int desired) {
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int prev = false;
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__atomic_exchange(&obj->value, &desired, &prev, __ATOMIC_SEQ_CST);
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return prev;
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}
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static zend_always_inline bool zend_atomic_bool_compare_exchange_ex(zend_atomic_bool *obj, bool *expected, bool desired) {
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return __atomic_compare_exchange(&obj->value, expected, &desired, /* weak */ false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline bool zend_atomic_int_compare_exchange_ex(zend_atomic_int *obj, int *expected, int desired) {
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return __atomic_compare_exchange(&obj->value, expected, &desired, /* weak */ false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline bool zend_atomic_bool_load_ex(const zend_atomic_bool *obj) {
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bool prev = false;
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__atomic_load(&obj->value, &prev, __ATOMIC_SEQ_CST);
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return prev;
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}
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static zend_always_inline int zend_atomic_int_load_ex(const zend_atomic_int *obj) {
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int prev = false;
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__atomic_load(&obj->value, &prev, __ATOMIC_SEQ_CST);
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return prev;
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}
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static zend_always_inline void zend_atomic_bool_store_ex(zend_atomic_bool *obj, bool desired) {
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__atomic_store(&obj->value, &desired, __ATOMIC_SEQ_CST);
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}
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static zend_always_inline void zend_atomic_int_store_ex(zend_atomic_int *obj, int desired) {
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__atomic_store(&obj->value, &desired, __ATOMIC_SEQ_CST);
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}
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#elif defined(HAVE_SYNC_ATOMICS)
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#define ZEND_ATOMIC_BOOL_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_INT_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_BOOL_INITIALIZER(desired) {.value = (desired)}
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#define ZEND_ATOMIC_INT_INITIALIZER(desired) {.value = (desired)}
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static zend_always_inline bool zend_atomic_bool_exchange_ex(zend_atomic_bool *obj, bool desired) {
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bool prev = __sync_lock_test_and_set(&obj->value, desired);
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/* __sync_lock_test_and_set only does an acquire barrier, so sync
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* immediately after.
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*/
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__sync_synchronize();
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return prev;
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}
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static zend_always_inline int zend_atomic_int_exchange_ex(zend_atomic_int *obj, int desired) {
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int prev = __sync_lock_test_and_set(&obj->value, desired);
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/* __sync_lock_test_and_set only does an acquire barrier, so sync
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* immediately after.
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*/
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__sync_synchronize();
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return prev;
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}
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static zend_always_inline bool zend_atomic_bool_compare_exchange_ex(zend_atomic_bool *obj, bool *expected, bool desired) {
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bool prev = __sync_val_compare_and_swap(&obj->value, *expected, desired);
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if (prev == *expected) {
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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static zend_always_inline bool zend_atomic_int_compare_exchange_ex(zend_atomic_int *obj, int *expected, int desired) {
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int prev = __sync_val_compare_and_swap(&obj->value, *expected, desired);
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if (prev == *expected) {
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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static zend_always_inline bool zend_atomic_bool_load_ex(zend_atomic_bool *obj) {
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/* Or'ing false won't change the value */
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return __sync_fetch_and_or(&obj->value, false);
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}
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static zend_always_inline int zend_atomic_int_load_ex(zend_atomic_int *obj) {
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/* Or'ing 0 won't change the value */
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return __sync_fetch_and_or(&obj->value, 0);
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}
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static zend_always_inline void zend_atomic_bool_store_ex(zend_atomic_bool *obj, bool desired) {
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__sync_synchronize();
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obj->value = desired;
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__sync_synchronize();
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}
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static zend_always_inline void zend_atomic_int_store_ex(zend_atomic_int *obj, int desired) {
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__sync_synchronize();
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obj->value = desired;
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__sync_synchronize();
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}
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#elif defined(HAVE_NO_ATOMICS)
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#warning No atomics support detected. Please open an issue with platform details.
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#define ZEND_ATOMIC_BOOL_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_INT_INIT(obj, desired) ((obj)->value = (desired))
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#define ZEND_ATOMIC_BOOL_INITIALIZER(desired) {.value = (desired)}
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#define ZEND_ATOMIC_INT_INITIALIZER(desired) {.value = (desired)}
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static zend_always_inline void zend_atomic_bool_store_ex(zend_atomic_bool *obj, bool desired) {
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obj->value = desired;
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}
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static zend_always_inline void zend_atomic_int_store_ex(zend_atomic_int *obj, int desired) {
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obj->value = desired;
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}
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static zend_always_inline bool zend_atomic_bool_compare_exchange_ex(zend_atomic_int *obj, bool *expected, bool desired) {
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bool prev = obj->value;
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if (prev == *expected) {
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obj->value = desired;
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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static zend_always_inline bool zend_atomic_int_compare_exchange_ex(zend_atomic_int *obj, int *expected, int desired) {
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int prev = obj->value;
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if (prev == *expected) {
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obj->value = desired;
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return true;
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} else {
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*expected = prev;
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return false;
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}
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}
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static zend_always_inline bool zend_atomic_bool_load_ex(const zend_atomic_bool *obj) {
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return obj->value;
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}
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static zend_always_inline int zend_atomic_int_load_ex(const zend_atomic_int *obj) {
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return obj->value;
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}
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static zend_always_inline bool zend_atomic_bool_exchange_ex(zend_atomic_bool *obj, bool desired) {
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bool prev = obj->value;
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obj->value = desired;
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return prev;
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}
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static zend_always_inline int zend_atomic_int_exchange_ex(zend_atomic_int *obj, int desired) {
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int prev = obj->value;
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obj->value = desired;
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return prev;
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}
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#endif
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ZEND_API void zend_atomic_bool_init(zend_atomic_bool *obj, bool desired);
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ZEND_API void zend_atomic_int_init(zend_atomic_int *obj, int desired);
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ZEND_API bool zend_atomic_bool_exchange(zend_atomic_bool *obj, bool desired);
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ZEND_API int zend_atomic_int_exchange(zend_atomic_int *obj, int desired);
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ZEND_API bool zend_atomic_bool_compare_exchange(zend_atomic_bool *obj, bool *expected, bool desired);
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ZEND_API bool zend_atomic_int_compare_exchange(zend_atomic_int *obj, int *expected, int desired);
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ZEND_API void zend_atomic_bool_store(zend_atomic_bool *obj, bool desired);
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ZEND_API void zend_atomic_int_store(zend_atomic_int *obj, int desired);
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#if defined(ZEND_WIN32) || defined(HAVE_SYNC_ATOMICS)
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/* On these platforms it is non-const due to underlying APIs. */
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ZEND_API bool zend_atomic_bool_load(zend_atomic_bool *obj);
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ZEND_API int zend_atomic_int_load(zend_atomic_int *obj);
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#else
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ZEND_API bool zend_atomic_bool_load(const zend_atomic_bool *obj);
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ZEND_API int zend_atomic_int_load(const zend_atomic_int *obj);
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#endif
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END_EXTERN_C()
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#endif
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