root.c

经典的psos编程实例源码

/* root.c */

#include "sys_conf.h"
#include <psos.h>
#include <prepc.h>
#include <stdio.h>

#include "misc.h"
#include "appl.h"

/* ROOT task */
void
root()
{
	void	* dummy;
	ULONG	ioretval, iopb[4], rc, args[4], tid, ignored, ev, pend;

	/* Initialize all drivers */
	de_init(DEV_TIMER, 0, &ioretval, &dummy);
	de_init(DEV_SERIAL, 0, &ioretval, &dummy);

	bpinit(128*100);
	bprintf("\nRoot task begin\n");

	/* Create and start the other task */
	args[2] = args[3] = 0;
	args[0] = (ULONG) T1_NAM;	/* Other task's name */
	t_ident(0, 0, & (args[1]));	/* My task's ID */
	if (rc = t_create(T1_NAM, 1, 1024, 1024, 0, &tid))
		fail(rc, "root: t_create(%s)", T1_NAM);
	if (rc = t_start(tid, 0, (void(*)()) tsk1, args))
		fail(rc, "root: t_start(%s)", T1_NAM);

	for (;;) {
		rc = ev_receive(0x0000aaaa, EV_ANY, 4*TENTH, & ev);
		if (rc == 0)
			bprintf("\t\t\tGot 0x%08x", ev);
		else if (rc == ERR_TIMEOUT)
			bprintf("\t\t\tTime-out .....");
		else
			fail(rc, "root: ev_receive");
		ev_receive(0, EV_NOWAIT, 0, & pend);
		bprintf(" (0x%08x still pending)\n", pend);
		if ((rc == 0) && (ev & FINAL_EV))
			break;
	}

	/* Example finished */
	bprintf("Root task end\n");
	bpflush();
	exit(0); /* Terminate */
}