108 lines
2.7 KiB
C
108 lines
2.7 KiB
C
/** @file
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* @brief An implementation of a solution to the dining philosophers problem
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* for both the nano- and microkernel.
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*
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* This particular implementation uses 6 fibers or tasks of
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* different priority, semaphores and timers. The implementation demostrates
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* fibers and semaphores in the nanokernel and tasks and timers in the
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* microkernel.
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*/
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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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#ifdef CONFIG_NANOKERNEL
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#include <nanokernel.h>
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#include "phil.h"
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#else
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#include <zephyr.h>
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#include "phil.h"
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#endif
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#define DEMO_DESCRIPTION \
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"\x1b[2J\x1b[15;1H" \
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"Demo Description\n" \
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"----------------\n" \
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"An implementation of a solution to the Dining Philosophers problem\n" \
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"(a classic multi-thread synchronization problem). This particular\n" \
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"implementation demonstrates the usage of multiple (6) %s\n" \
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"of differing priorities and the %s semaphores and timers."
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#ifdef CONFIG_NANOKERNEL
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#define STSIZE 1024
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extern void philEntry (void); //!< External function.
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char philStack[N_PHILOSOPHERS][STSIZE];//!< Declares a global stack of size 1024.
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struct nano_sem forks[N_PHILOSOPHERS];//!< Declares global semaphore forks for the number of philosophers.
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#endif /* CONFIG_NANOKERNEL */
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#ifdef CONFIG_NANOKERNEL
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/**
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* @brief The nanokernel entry point.
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*
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* Actions:
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* -# Starts one fiber per philosopher.
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* -# Waits forever.
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* @return Does not return.
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*/
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int main (void)
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{
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int i;
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PRINTF (DEMO_DESCRIPTION, "fibers", "nanokernel");
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for (i = 0; i < N_PHILOSOPHERS; i++)
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{
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nano_sem_init (&forks[i]);
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nano_task_sem_give (&forks[i]);
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}
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/* A1 */
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for (i = 0; i < N_PHILOSOPHERS; i++)
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task_fiber_start (&philStack[i][0], STSIZE,
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(nano_fiber_entry_t) philEntry, 0, 0, 6, 0);
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/* A2 */
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while (1)
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{
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extern void nano_cpu_idle (void);
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nano_cpu_idle ();
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}
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}
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#else
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/**
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* @brief Starts the dining philosophers demo of the microkernel.
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*
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* This function starts the dining philosophers demo and
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* then waits forever.
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* @return Does not return.
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*/
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void philDemo(void) {
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PRINTF(DEMO_DESCRIPTION, "tasks", "microkernel");
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task_group_start(PHI);
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while (1) {
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task_sleep(10000);
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}
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}
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#endif
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