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/*-
* BSD LICENSE
*
* Copyright(c) 2015 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LTHREAD_TIMER_H_
#define LTHREAD_TIMER_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "lthread_int.h"
#include "lthread_sched.h"
static inline uint64_t
_ns_to_clks(uint64_t ns)
{
/*
* clkns needs to be divided by 1E9 to get ns clocks. However,
* dividing by this first would lose a lot of accuracy.
* Dividing after a multiply by ns, could cause overflow of
* uint64_t if ns is about 5 seconds [if we assume a max tsc
* rate of 4GHz]. Therefore we first divide by 1E4, then
* multiply and finally divide by 1E5. This allows ns to be
* values many hours long, without overflow, while still keeping
* reasonable accuracy.
*/
uint64_t clkns = rte_get_tsc_hz() / 1e4;
clkns *= ns;
clkns /= 1e5;
return clkns;
}
static inline void
_timer_start(struct lthread *lt, uint64_t clks)
{
if (clks > 0) {
DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_START, <->tim, clks);
rte_timer_init(<->tim);
rte_timer_reset(<->tim,
clks,
SINGLE,
rte_lcore_id(),
_sched_timer_cb,
(void *)lt);
}
}
static inline void
_timer_stop(struct lthread *lt)
{
if (lt != NULL) {
DIAG_EVENT(lt, LT_DIAG_LTHREAD_TMR_DELETE, <->tim, 0);
rte_timer_stop(<->tim);
}
}
#ifdef __cplusplus
}
#endif
#endif /* LTHREAD_TIMER_H_ */
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