69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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* Copyright (c) 2016, Xilinx Inc. and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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/*
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* @file generic/condition.h
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* @brief Generic condition variable primitives for libmetal.
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*/
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#ifndef __METAL_CONDITION__H__
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#error "Include metal/condition.h instead of metal/generic/condition.h"
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#endif
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#ifndef __METAL_GENERIC_CONDITION__H__
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#define __METAL_GENERIC_CONDITION__H__
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#include <unistd.h>
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#include <metal/atomic.h>
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#include <stdint.h>
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#include <limits.h>
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#include <metal/errno.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct metal_condition {
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metal_mutex_t *m; /**< mutex.
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The condition variable is attached to
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this mutex when it is waiting.
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It is also used to check correctness
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in case there are multiple waiters. */
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atomic_int v; /**< condition variable value. */
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};
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/** Static metal condition variable initialization. */
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#define METAL_CONDITION_INIT { NULL, ATOMIC_VAR_INIT(0) }
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static inline void metal_condition_init(struct metal_condition *cv)
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{
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cv->m = NULL;
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atomic_init(&cv->v, 0);
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}
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static inline int metal_condition_signal(struct metal_condition *cv)
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{
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if (!cv)
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return -EINVAL;
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/** wake up waiters if there are any. */
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atomic_fetch_add(&cv->v, 1);
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return 0;
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}
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static inline int metal_condition_broadcast(struct metal_condition *cv)
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{
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return metal_condition_signal(cv);
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __METAL_GENERIC_CONDITION__H__ */
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