122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/** @file
|
|
* @brief An implementation of a solution to the dining philosophers problem
|
|
* for both the nano- and microkernel.
|
|
*
|
|
* This particular implementation uses 6 fibers or tasks of
|
|
* different priority, semaphores and timers. The implementation demostrates
|
|
* fibers and semaphores in the nanokernel and tasks and timers in the
|
|
* microkernel.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2012-2014 Wind River Systems, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1) Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2) 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.
|
|
*
|
|
* 3) Neither the name of Wind River Systems 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 HOLDER 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.
|
|
*/
|
|
|
|
#ifdef CONFIG_NANOKERNEL
|
|
#include <nanokernel.h>
|
|
#include "phil.h"
|
|
#else
|
|
#include <zephyr.h>
|
|
#include "phil.h"
|
|
#endif
|
|
|
|
#define DEMO_DESCRIPTION \
|
|
"\x1b[2J\x1b[15;1H" \
|
|
"Demo Description\n" \
|
|
"----------------\n" \
|
|
"An implementation of a solution to the Dining Philosophers problem\n" \
|
|
"(a classic multi-thread synchronization problem). This particular\n" \
|
|
"implementation demonstrates the usage of multiple (6) %s\n" \
|
|
"of differing priorities and the %s semaphores and timers."
|
|
|
|
#ifdef CONFIG_NANOKERNEL
|
|
|
|
#define STSIZE 1024
|
|
|
|
extern void philEntry (void); //!< External function.
|
|
|
|
char philStack[N_PHILOSOPHERS][STSIZE];//!< Declares a global stack of size 1024.
|
|
struct nano_sem forks[N_PHILOSOPHERS];//!< Declares global semaphore forks for the number of philosophers.
|
|
#endif /* CONFIG_NANOKERNEL */
|
|
|
|
#ifdef CONFIG_NANOKERNEL
|
|
|
|
/**
|
|
* @brief The nanokernel entry point.
|
|
*
|
|
* Actions:
|
|
* -# Starts one fiber per philosopher.
|
|
* -# Waits forever.
|
|
* @return Does not return.
|
|
*/
|
|
int main (void)
|
|
{
|
|
int i;
|
|
|
|
PRINTF (DEMO_DESCRIPTION, "fibers", "nanokernel");
|
|
|
|
for (i = 0; i < N_PHILOSOPHERS; i++)
|
|
{
|
|
nano_sem_init (&forks[i]);
|
|
nano_task_sem_give (&forks[i]);
|
|
}
|
|
|
|
/* A1 */
|
|
for (i = 0; i < N_PHILOSOPHERS; i++)
|
|
task_fiber_start (&philStack[i][0], STSIZE,
|
|
(nano_fiber_entry_t) philEntry, 0, 0, 6, 0);
|
|
|
|
/* A2 */
|
|
while (1)
|
|
{
|
|
extern void nano_cpu_idle (void);
|
|
nano_cpu_idle ();
|
|
}
|
|
}
|
|
|
|
#else
|
|
|
|
/**
|
|
* @brief Starts the dining philosophers demo of the microkernel.
|
|
*
|
|
* This function starts the dining philosophers demo and
|
|
* then waits forever.
|
|
* @return Does not return.
|
|
*/
|
|
void philDemo(void) {
|
|
PRINTF(DEMO_DESCRIPTION, "tasks", "microkernel");
|
|
|
|
task_group_start(PHI);
|
|
|
|
while (1) {
|
|
task_sleep(10000);
|
|
}
|
|
}
|
|
#endif
|