File: [local] / prex-old / usr / sample / thread / thread.c (download)
Revision 1.1.1.1.2.1, Wed Aug 13 16:12:42 2008 UTC (16 years ago) by nbrk
Branch: PREX_0_8_BASE
Changes since 1.1.1.1: +2 -2 lines
Prex 0.8.0 has been released. Branch off from vanilla PREX_0_7_BASE preparing
the tree for backporting my changes.
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/*
* Copyright (c) 2005, Kohsuke Ohtani
* All rights reserved.
*
* 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 the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
/*
* thread.c - sample program to create three threads.
*/
#include <prex/prex.h>
#include <stdio.h>
#define VERBOSE_MODE
#ifdef VERBOSE_MODE
#define thr_printf(s) printf(s)
#else
#define thr_printf(s)
#endif
static thread_t main_th;
static char stack[3][1024];
/*
* Run specified routine as new thread.
*/
static int
thread_run(void (*start)(void), void *stack)
{
thread_t th;
if (thread_create(task_self(), &th) != 0)
return -1;
if (thread_load(th, start, stack) != 0)
return -1;
if (thread_resume(th) != 0)
return -1;
return 0;
}
/*
* Display 'AAAA...'
*/
static void
thread_A(void)
{
int i;
thr_printf("\nthread A is starting\n");
for (i = 0; i < 1024; i++) {
thr_printf("A");
if ((i & 0xff) == 0)
thread_yield();
}
thr_printf("\nthread A is terminated\n");
thread_terminate(thread_self());
}
/*
* Display 'BBBB...'
*/
static void
thread_B(void)
{
int i;
thr_printf("\nthread B is starting\n");
for (i = 0; i < 4096; i++) {
thr_printf("B");
if ((i & 0xff) == 0)
thread_yield();
}
thr_printf("\nthread B is terminated\n");
thread_terminate(thread_self());
}
/*
* Display 'CCCC...'
*/
static void
thread_C(void)
{
int i;
thr_printf("\nthread C is starting\n");
for (i = 0; i < 8192; i++) {
thr_printf("C");
if ((i & 0xff) == 0)
thread_yield();
}
thr_printf("\nthread C is terminated\n");
thread_terminate(thread_self());
}
int
main(int argc, char *argv[])
{
int err;
printf("Thread sample program\n");
main_th = thread_self();
/*
* Raise this thread's priority.
*/
err = thread_setprio(main_th, 100);
/*
* Run threads as normal priority thread.
*/
thread_run(thread_A, stack[0]+1024);
thread_run(thread_B, stack[1]+1024);
thread_run(thread_C, stack[2]+1024);
/*
* Lower this thread's priority.
*/
err = thread_setprio(main_th, 254);
/*
* Since other threads have higher priority than
* this thread, the control will come here only when
* all other threads are terminated.
*/
printf("test - OK!\n");
return 0;
}