271ce40239
It should fix ck_pr_[load|store]_ptr on mips and riscv, make sure no *fence instructions are used on i386, as older cpus don't support it, and make sure we don't rely on gcc builtins that can lead to calls to libatomic when linked with -O0. MFC after: 1 week
298 lines
6.8 KiB
C
298 lines
6.8 KiB
C
/*
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* Copyright 2010 Samy Al Bahra.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef CK_PR_GCC_H
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#define CK_PR_GCC_H
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#ifndef CK_PR_H
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#error Do not include this file directly, use ck_pr.h
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#endif
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#include <ck_cc.h>
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CK_CC_INLINE static void
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ck_pr_barrier(void)
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{
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__asm__ __volatile__("" ::: "memory");
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return;
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}
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#ifndef CK_F_PR
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#define CK_F_PR
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#include <ck_stdbool.h>
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#include <ck_stdint.h>
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/*
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* The following represent supported atomic operations.
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* These operations may be emulated.
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*/
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#include "ck_f_pr.h"
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#define CK_PR_ACCESS(x) (*(volatile __typeof__(x) *)&(x))
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#define CK_PR_LOAD(S, M, T) \
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CK_CC_INLINE static T \
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ck_pr_md_load_##S(const M *target) \
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{ \
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T r; \
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ck_pr_barrier(); \
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r = CK_PR_ACCESS(*(const T *)target); \
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ck_pr_barrier(); \
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return (r); \
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} \
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CK_CC_INLINE static void \
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ck_pr_md_store_##S(M *target, T v) \
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{ \
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ck_pr_barrier(); \
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CK_PR_ACCESS(*(T *)target) = v; \
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ck_pr_barrier(); \
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return; \
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}
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CK_CC_INLINE static void *
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ck_pr_md_load_ptr(const void *target)
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{
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void *r;
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ck_pr_barrier();
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r = CK_CC_DECONST_PTR(*(volatile void *const*)(target));
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ck_pr_barrier();
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return r;
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}
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CK_CC_INLINE static void
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ck_pr_md_store_ptr(void *target, const void *v)
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{
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ck_pr_barrier();
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*(volatile void **)target = CK_CC_DECONST_PTR(v);
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ck_pr_barrier();
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return;
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}
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#define CK_PR_LOAD_S(S, T) CK_PR_LOAD(S, T, T)
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CK_PR_LOAD_S(char, char)
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CK_PR_LOAD_S(uint, unsigned int)
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CK_PR_LOAD_S(int, int)
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#ifndef CK_PR_DISABLE_DOUBLE
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CK_PR_LOAD_S(double, double)
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#endif
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CK_PR_LOAD_S(64, uint64_t)
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CK_PR_LOAD_S(32, uint32_t)
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CK_PR_LOAD_S(16, uint16_t)
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CK_PR_LOAD_S(8, uint8_t)
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#undef CK_PR_LOAD_S
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#undef CK_PR_LOAD
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CK_CC_INLINE static void
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ck_pr_stall(void)
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{
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ck_pr_barrier();
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}
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/*
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* Load and store fences are equivalent to full fences in the GCC port.
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*/
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#define CK_PR_FENCE(T) \
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CK_CC_INLINE static void \
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ck_pr_fence_strict_##T(void) \
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{ \
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__sync_synchronize(); \
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}
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CK_PR_FENCE(atomic)
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CK_PR_FENCE(atomic_atomic)
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CK_PR_FENCE(atomic_load)
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CK_PR_FENCE(atomic_store)
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CK_PR_FENCE(store_atomic)
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CK_PR_FENCE(load_atomic)
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CK_PR_FENCE(load)
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CK_PR_FENCE(load_load)
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CK_PR_FENCE(load_store)
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CK_PR_FENCE(store)
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CK_PR_FENCE(store_store)
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CK_PR_FENCE(store_load)
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CK_PR_FENCE(memory)
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CK_PR_FENCE(acquire)
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CK_PR_FENCE(release)
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CK_PR_FENCE(acqrel)
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CK_PR_FENCE(lock)
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CK_PR_FENCE(unlock)
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#undef CK_PR_FENCE
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/*
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* Atomic compare and swap.
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*/
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#define CK_PR_CAS(S, M, T) \
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CK_CC_INLINE static bool \
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ck_pr_cas_##S(M *target, T compare, T set) \
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{ \
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bool z; \
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z = __sync_bool_compare_and_swap((T *)target, compare, set); \
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return z; \
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}
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CK_PR_CAS(ptr, void, void *)
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#define CK_PR_CAS_S(S, T) CK_PR_CAS(S, T, T)
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CK_PR_CAS_S(char, char)
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CK_PR_CAS_S(int, int)
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CK_PR_CAS_S(uint, unsigned int)
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CK_PR_CAS_S(64, uint64_t)
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CK_PR_CAS_S(32, uint32_t)
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CK_PR_CAS_S(16, uint16_t)
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CK_PR_CAS_S(8, uint8_t)
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#undef CK_PR_CAS_S
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#undef CK_PR_CAS
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/*
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* Compare and swap, set *v to old value of target.
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*/
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CK_CC_INLINE static bool
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ck_pr_cas_ptr_value(void *target, void *compare, void *set, void *v)
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{
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set = __sync_val_compare_and_swap((void **)target, compare, set);
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*(void **)v = set;
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return (set == compare);
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}
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#define CK_PR_CAS_O(S, T) \
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CK_CC_INLINE static bool \
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ck_pr_cas_##S##_value(T *target, T compare, T set, T *v) \
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{ \
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set = __sync_val_compare_and_swap(target, compare, set);\
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*v = set; \
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return (set == compare); \
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}
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CK_PR_CAS_O(char, char)
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CK_PR_CAS_O(int, int)
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CK_PR_CAS_O(uint, unsigned int)
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CK_PR_CAS_O(64, uint64_t)
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CK_PR_CAS_O(32, uint32_t)
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CK_PR_CAS_O(16, uint16_t)
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CK_PR_CAS_O(8, uint8_t)
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#undef CK_PR_CAS_O
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/*
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* Atomic fetch-and-add operations.
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*/
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#define CK_PR_FAA(S, M, T) \
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CK_CC_INLINE static T \
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ck_pr_faa_##S(M *target, T d) \
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{ \
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d = __sync_fetch_and_add((T *)target, d); \
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return (d); \
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}
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CK_PR_FAA(ptr, void, void *)
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#define CK_PR_FAA_S(S, T) CK_PR_FAA(S, T, T)
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CK_PR_FAA_S(char, char)
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CK_PR_FAA_S(uint, unsigned int)
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CK_PR_FAA_S(int, int)
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CK_PR_FAA_S(64, uint64_t)
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CK_PR_FAA_S(32, uint32_t)
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CK_PR_FAA_S(16, uint16_t)
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CK_PR_FAA_S(8, uint8_t)
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#undef CK_PR_FAA_S
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#undef CK_PR_FAA
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/*
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* Atomic store-only binary operations.
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*/
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#define CK_PR_BINARY(K, S, M, T) \
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CK_CC_INLINE static void \
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ck_pr_##K##_##S(M *target, T d) \
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{ \
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d = __sync_fetch_and_##K((T *)target, d); \
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return; \
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}
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#define CK_PR_BINARY_S(K, S, T) CK_PR_BINARY(K, S, T, T)
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#define CK_PR_GENERATE(K) \
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CK_PR_BINARY(K, ptr, void, void *) \
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CK_PR_BINARY_S(K, char, char) \
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CK_PR_BINARY_S(K, int, int) \
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CK_PR_BINARY_S(K, uint, unsigned int) \
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CK_PR_BINARY_S(K, 64, uint64_t) \
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CK_PR_BINARY_S(K, 32, uint32_t) \
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CK_PR_BINARY_S(K, 16, uint16_t) \
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CK_PR_BINARY_S(K, 8, uint8_t)
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CK_PR_GENERATE(add)
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CK_PR_GENERATE(sub)
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CK_PR_GENERATE(and)
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CK_PR_GENERATE(or)
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CK_PR_GENERATE(xor)
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#undef CK_PR_GENERATE
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#undef CK_PR_BINARY_S
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#undef CK_PR_BINARY
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#define CK_PR_UNARY(S, M, T) \
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CK_CC_INLINE static void \
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ck_pr_inc_##S(M *target) \
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{ \
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ck_pr_add_##S(target, (T)1); \
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return; \
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} \
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CK_CC_INLINE static void \
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ck_pr_dec_##S(M *target) \
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{ \
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ck_pr_sub_##S(target, (T)1); \
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return; \
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}
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#define CK_PR_UNARY_S(S, M) CK_PR_UNARY(S, M, M)
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CK_PR_UNARY(ptr, void, void *)
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CK_PR_UNARY_S(char, char)
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CK_PR_UNARY_S(int, int)
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CK_PR_UNARY_S(uint, unsigned int)
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CK_PR_UNARY_S(64, uint64_t)
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CK_PR_UNARY_S(32, uint32_t)
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CK_PR_UNARY_S(16, uint16_t)
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CK_PR_UNARY_S(8, uint8_t)
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#undef CK_PR_UNARY_S
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#undef CK_PR_UNARY
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#endif /* !CK_F_PR */
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#endif /* CK_PR_GCC_H */
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