#include <os.h>
#include <rmon.h>
#include "corefunc.h"

/*
 * mesg3
 *
 * Tests for:
 *	osSendMesg
 *	osRecvMesg
 *
 * Assumed working:
 *	osGetIntMask
 *	osSetIntMask
 *	osCreateMesgQueue
 *	osCreateThread
 *	osStartThread
 *	osSetThreadPriority
 *
 * Description:
 *	Check that an awakened thread that was previously blocked on a
 *		osRecvMesg preempts the sender if the receiver is running
 *		at a higher priority.
 *	Check that an awakened thread that was previously blocked on a
 *		osSendMesg preempts the receiver if the sender is running
 *		at a higher priority.
 */

#define	NUM_LOG		8

static void		slave(void *);
static int		logExecution(int);

static OSMesgQueue	mesgQueue;
static OSMesg		mesgBuf[1];

static OSMesgQueue	slaveMesgQueue;
static OSMesg		slaveMesgBuf[1];

static OSThread		slaveThread;
static char		slaveStack[STACKSIZE];

static int		logTab[NUM_LOG];
static int		*logPtr = logTab;
static int		expLogTab[NUM_LOG] = { 0, 1, 0, 0, 1, 0, 1, 1 };

int
mesg3(void)
{
    OSIntMask savedMask, currentMask;
    OSMesg actualMesg, expectedMesg;
    int i;
    int retValue;
    int addFailures, numFailures = 0;
    
    savedMask = osSetIntMask(OS_IM_ALL);

    /*
     * Give the master (current) thread the highest priority.
     */

    osSetThreadPri(NULL, 20);

    osCreateMesgQueue(&slaveMesgQueue, slaveMesgBuf, 1);

    osCreateThread(&slaveThread, 100, slave, (void *)0,
		   slaveStack+STACKSIZE, 10);
    osStartThread(&slaveThread);

    if (logExecution(0))
	numFailures++;

    osCreateMesgQueue(&mesgQueue, mesgBuf, 1);

    /*
     * Block, waiting to receive a message.  Should run immediately after
     * the message is sent.
     */
    expectedMesg = (OSMesg)0;
    (void)osRecvMesg(&mesgQueue, &actualMesg, OS_MESG_BLOCK);

    if (logExecution(0))
	numFailures++;

    if (expectedMesg != actualMesg) {
	osSyncPrintf("mesg3: expected message 0x%x, actual 0x%x\n",
		expectedMesg, actualMesg);
	numFailures++;
    }
    currentMask = osGetIntMask();
    if (currentMask != OS_IM_ALL) {
	osSyncPrintf("mesg3: expected interrupt mask 0x%x, actual 0x%x\n",
		OS_IM_ALL, currentMask);
	numFailures++;
    }
    
    /*
     * Send two messages, back to back.  The second message should
     * cause the sender to block; the calling thread should awaken
     * immediately after the first message is received by the slave.
     */
    for (i = 0; i < 2; i++) {
	expectedMesg = (OSMesg)((i<<24)|(i<<16)|(i<<8)|i);
	retValue = osSendMesg(&mesgQueue, expectedMesg, OS_MESG_BLOCK);

	if (logExecution(0))
	    numFailures++;

	if (retValue != 0) {
	    osSyncPrintf(
		"mesg3: expected osSendMesg return value %d, actual %d\n",
		0, retValue);
	    numFailures++;
	}
	currentMask = osGetIntMask();
	if (currentMask != OS_IM_ALL) {
	    osSyncPrintf("mesg3: expected interrupt mask 0x%x, actual 0x%x\n",
		OS_IM_ALL, currentMask);
	    numFailures++;
	}
    }

    (void)osRecvMesg(&slaveMesgQueue, (OSMesg *)&addFailures, OS_MESG_BLOCK);
    numFailures += addFailures;

    /*
     * Verify everybody ran when they were supposed to.
     */
    if (logPtr != &logTab[NUM_LOG]) {
	osSyncPrintf("mesg3: log table underflow\n");
	numFailures++;
    }
    for (i = 0; i < logPtr - logTab; i++) {
	if (expLogTab[i] != logTab[i]) {
	    osSyncPrintf("mesg3: expected log id %d, actual %d at entry %d\n",
		expLogTab[i], logTab[i], i);
	    numFailures++;
	}
    }

    /*
     * Restore original interrupt mask and check it once more.
     */
    currentMask = osSetIntMask(savedMask);
    if (currentMask != OS_IM_ALL) {
	osSyncPrintf("mesg3: expected interrupt mask 0x%x, actual 0x%x\n",
		OS_IM_ALL, currentMask);
	numFailures++;
    }
    return(numFailures);
}

static void
slave(void *arg)
{
    OSIntMask currentMask;
    OSMesg actualMesg, expectedMesg;
    int i;
    int retValue;
    int numFailures = 0;

    if (logExecution(1))
	numFailures++;

    /*
     * Send a message to the master, immediately unblocking it.
     */
    expectedMesg = (OSMesg)0;
    retValue = osSendMesg(&mesgQueue, expectedMesg, OS_MESG_NOBLOCK);

    if (logExecution(1))
	numFailures++;

    if (retValue != 0) {
	osSyncPrintf("mesg3: expected osSendMesg return value %d, actual %d\n",
		0, retValue);
	numFailures++;
    }
    currentMask = osGetIntMask();
    if (currentMask != OS_IM_ALL) {
	osSyncPrintf("mesg3: expected interrupt mask 0x%x, actual 0x%x\n",
		OS_IM_ALL, currentMask);
	numFailures++;
    }

    /*
     * Wait for two messages to arrive from the master;
     * reading the first message should wake up the master.
     */
    for (i = 0; i < 2; i++) {
	expectedMesg = (OSMesg)((i<<24)|(i<<16)|(i<<8)|i);
	(void)osRecvMesg(&mesgQueue, &actualMesg, OS_MESG_BLOCK);

	if (logExecution(1))
	    numFailures++;

	if (expectedMesg != actualMesg) {
	    osSyncPrintf("mesg3: expected message 0x%x, actual 0x%x\n",
		expectedMesg, actualMesg);
	    numFailures++;
	}

	currentMask = osGetIntMask();
	if (currentMask != OS_IM_ALL) {
	    osSyncPrintf("mesg3: expected interrupt mask 0x%x, actual 0x%x\n",
		OS_IM_ALL, currentMask);
	    numFailures++;
	}
    }

    osSendMesg(&slaveMesgQueue, (OSMesg)numFailures, OS_MESG_BLOCK);
}

static int
logExecution(int id)
{
    if (logPtr >= &logTab[NUM_LOG]) {
	osSyncPrintf("mesg3: log table overflow\n");
	return(1);
    }
/*
    osSyncPrintf("%d. log %d\n", logPtr-logTab, id);
*/
    *logPtr++ = id;
    return(0);
}