40eba989e2
Changes the semaphore API so that the timeout parameter must be specified when invoking task_sem_take() thereby obsoleting the following APIs: task_sem_take_wait() task_sem_take_wait_timeout() _task_sem_take() Change-Id: I746d5c966a3b81ffe014333af51aa10ea8a63263 Signed-off-by: Peter Mitsis <peter.mitsis@windriver.com>
148 lines
3.5 KiB
C
148 lines
3.5 KiB
C
/* hello.c - Hello World demo */
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/*
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* Copyright (c) 2012-2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <zephyr.h>
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#if defined(CONFIG_STDOUT_CONSOLE)
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#include <stdio.h>
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#define PRINT printf
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#else
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#include <misc/printk.h>
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#define PRINT printk
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#endif
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#ifdef CONFIG_MICROKERNEL
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/*
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* Microkernel version of hello world demo has two tasks that utilize
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* semaphores and sleeps to take turns printing a greeting message at
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* a controlled rate.
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*/
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/* specify delay between greetings (in ms); compute equivalent in ticks */
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#define SLEEPTIME 500
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#define SLEEPTICKS (SLEEPTIME * sys_clock_ticks_per_sec / 1000)
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/*
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*
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* @param taskname task identification string
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* @param mySem task's own semaphore
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* @param otherSem other task's semaphore
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*
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*/
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void helloLoop(const char *taskname, ksem_t mySem, ksem_t otherSem)
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{
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while (1) {
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task_sem_take(mySem, TICKS_UNLIMITED);
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/* say "hello" */
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PRINT("%s: Hello World!\n", taskname);
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/* wait a while, then let other task have a turn */
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task_sleep(SLEEPTICKS);
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task_sem_give(otherSem);
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}
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}
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void taskA(void)
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{
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/* taskA gives its own semaphore, allowing it to say hello right away */
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task_sem_give(TASKASEM);
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/* invoke routine that allows task to ping-pong hello messages with taskB */
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helloLoop(__func__, TASKASEM, TASKBSEM);
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}
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void taskB(void)
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{
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/* invoke routine that allows task to ping-pong hello messages with taskA */
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helloLoop(__func__, TASKBSEM, TASKASEM);
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}
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#else /* CONFIG_NANOKERNEL */
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/*
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* Nanokernel version of hello world demo has a task and a fiber that utilize
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* semaphores and timers to take turns printing a greeting message at
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* a controlled rate.
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*/
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/* specify delay between greetings (in ms); compute equivalent in ticks */
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#define SLEEPTIME 500
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#define SLEEPTICKS (SLEEPTIME * sys_clock_ticks_per_sec / 1000)
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#define STACKSIZE 2000
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char __stack fiberStack[STACKSIZE];
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struct nano_sem nanoSemTask;
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struct nano_sem nanoSemFiber;
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void fiberEntry(void)
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{
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struct nano_timer timer;
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uint32_t data[2] = {0, 0};
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nano_sem_init(&nanoSemFiber);
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nano_timer_init(&timer, data);
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while (1) {
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/* wait for task to let us have a turn */
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nano_fiber_sem_take_wait(&nanoSemFiber);
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/* say "hello" */
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PRINT("%s: Hello World!\n", __func__);
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/* wait a while, then let task have a turn */
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nano_fiber_timer_start(&timer, SLEEPTICKS);
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nano_fiber_timer_wait(&timer);
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nano_fiber_sem_give(&nanoSemTask);
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}
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}
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void main(void)
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{
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struct nano_timer timer;
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uint32_t data[2] = {0, 0};
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task_fiber_start(&fiberStack[0], STACKSIZE,
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(nano_fiber_entry_t) fiberEntry, 0, 0, 7, 0);
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nano_sem_init(&nanoSemTask);
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nano_timer_init(&timer, data);
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while (1) {
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/* say "hello" */
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PRINT("%s: Hello World!\n", __func__);
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/* wait a while, then let fiber have a turn */
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nano_task_timer_start(&timer, SLEEPTICKS);
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nano_task_timer_wait(&timer);
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nano_task_sem_give(&nanoSemFiber);
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/* now wait for fiber to let us have a turn */
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nano_task_sem_take_wait(&nanoSemTask);
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}
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}
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#endif /* CONFIG_MICROKERNEL || CONFIG_NANOKERNEL */
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