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51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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/*
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* Copyright (C) 2020 Kaspar Schleiser <kaspar@schleiser.de>
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* 2020 Freie Universität Berlin
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* 2020 Inria
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*
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* This file is subject to the terms and conditions of the GNU Lesser General
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* Public License v2.1. See the file LICENSE in the top level directory for more
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* details.
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*/
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/**
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* @ingroup sys_ztimer64
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* @{
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*
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* @file
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* @brief ztimer64 overhead measurement functions
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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*
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* @}
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*/
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#include "atomic_utils.h"
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#include "ztimer64.h"
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typedef struct {
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ztimer64_clock_t *clock;
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volatile uint64_t *val;
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} callback_arg_t;
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static void _callback(void *arg)
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{
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callback_arg_t *callback_arg = (callback_arg_t *)arg;
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atomic_store_u64(callback_arg->val, ztimer64_now(callback_arg->clock));
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}
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int64_t ztimer64_overhead(ztimer64_clock_t *clock, uint64_t base)
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{
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volatile uint64_t after = 0;
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uint64_t pre;
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callback_arg_t arg = { .clock = clock, .val = &after };
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ztimer64_t t = { .callback = _callback, .arg = &arg };
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pre = ztimer64_now(clock);
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ztimer64_set(clock, &t, base);
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while (!atomic_load_u64(&after)) {}
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return after - pre - base;
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}
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