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54adf5979c
In the current NuttX kernel implementation, there is no function
to represent pure scheduler ticks.
The existing clock_systime_ticks() cannot serve this purpose,
because it keeps increasing even when the scheduler is not running.
This happens since the returned value reflects real hardware time:
as long as the timer or alarm hardware is active,
clock_systime_ticks() will continuously increase.
This patch introduces two new functions that provide access to
scheduler ticks — a counter that only increases when the scheduler
itself is running.
Signed-off-by: Chengdong Wang wangchengdong@lixiang.com
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
############################################################################
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# sched/clock/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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CSRCS += clock.c clock_initialize.c clock_settime.c clock_gettime.c
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CSRCS += clock_systime_ticks.c clock_systime_timespec.c clock_sched_ticks.c
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CSRCS += clock_perf.c clock_realtime2absticks.c
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# Unless a driver with a more accurate version of up_*delay is enabled, always
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# include the base delay definition (busy-loop) as a minimum-viable product. We
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# don't want the weak references to conflict.
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ifneq ($(CONFIG_TIMER_ARCH),y)
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CSRCS += delay.c
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endif
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ifeq ($(CONFIG_CLOCK_TIMEKEEPING),y)
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CSRCS += clock_timekeeping.c
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endif
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ifeq ($(CONFIG_CLOCK_ADJTIME),y)
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CSRCS += clock_adjtime.c
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endif
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# Include clock build support
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DEPPATH += --dep-path clock
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VPATH += :clock
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