mirror of
https://github.com/emqx/neuron.git
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Parker Liu
83 lines
2.9 KiB
C
83 lines
2.9 KiB
C
/**
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* NEURON IIoT System for Industry 4.0
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* Copyright (C) 2020-2021 EMQ Technologies Co., Ltd All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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#ifndef NEURON_ATOMIC_H_
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#define NEURON_ATOMIC_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdatomic.h>
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#include <stdbool.h>
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// neu_atomic_flag supports only test-and-set and reset operations.
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// This can be implemented without locks on any reasonable system, and
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// it corresponds to C11 atomic flag.
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struct neu_atomic_flag {
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atomic_flag f;
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};
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typedef struct neu_atomic_flag neu_atomic_flag;
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extern bool neu_atomic_flag_test_and_set(neu_atomic_flag *);
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extern void neu_atomic_flag_reset(neu_atomic_flag *);
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// neu_atomic_bool is for boolean flags that need to be checked without
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// changing their value. This might require a lock on some systems.
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struct neu_atomic_bool {
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atomic_bool v;
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};
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typedef struct neu_atomic_bool neu_atomic_bool;
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extern void neu_atomic_init_bool(neu_atomic_bool *);
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extern void neu_atomic_set_bool(neu_atomic_bool *, bool);
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extern bool neu_atomic_get_bool(neu_atomic_bool *);
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extern bool neu_atomic_swap_bool(neu_atomic_bool *, bool);
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// In a lot of circumstances, we want a simple atomic reference count,
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// or atomic tunable values for integers like queue lengths or TTLs.
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// These native integer forms should be preferred over the 64 bit versions
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// unless larger bit sizes are truly needed. They will be more efficient
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// on many platforms.
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struct neu_atomic_int {
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atomic_int v;
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};
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typedef struct neu_atomic_int neu_atomic_int;
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extern void neu_atomic_init(neu_atomic_int *);
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extern void neu_atomic_add(neu_atomic_int *, int);
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extern void neu_atomic_sub(neu_atomic_int *, int);
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extern int neu_atomic_get(neu_atomic_int *);
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extern void neu_atomic_set(neu_atomic_int *, int);
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extern int neu_atomic_swap(neu_atomic_int *, int);
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extern int neu_atomic_dec_nv(neu_atomic_int *);
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extern void neu_atomic_dec(neu_atomic_int *);
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extern void neu_atomic_inc(neu_atomic_int *);
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// neu_atomic_cas is a compare and swap. The second argument is the
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// value to compare against, and the third is the new value. Returns
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// true if the value was set.
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extern bool neu_atomic_cas(neu_atomic_int *, int, int);
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#ifdef __cplusplus
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}
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#endif
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#endif
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