03d2a4fcbc
The collaboration content files have been placed in three folders. One for communication, one for code collaboration and one for documentation collaboration. This change only moves and renames the files. The cross-references and file paths within the files have NOT ben change. That is comming on the next change. Change-Id: Ic09a51878ab432561bc394a4464570cc51a28d69 Signed-off-by: Rodrigo Caballero <rodrigo.caballero.abraham@intel.com>
122 lines
3.6 KiB
C
122 lines
3.6 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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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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