tt3.c

/*
 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
 *      The President and Fellows of Harvard College.
 *
 * 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 University 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 UNIVERSITY 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 UNIVERSITY 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.
 */

/*
 * More thread test code.
 */
#include <types.h>
#include <lib.h>
#include <wchan.h>
#include <thread.h>
#include <synch.h>
#include <test.h>

#include "opt-synchprobs.h"

/* dimension of matrices (cannot be too large or will overflow stack) */

#if OPT_SYNCHPROBS
#define DIM 10
#else
#define DIM 70
#endif

/* number of iterations for sleepalot threads */
#define SLEEPALOT_PRINTS      20        /* number of printouts */
#define SLEEPALOT_ITERS       4         /* iterations per printout */
/* polling frequency of waker thread */
#define WAKER_WAKES          100
/* number of iterations per compute thread */
#define COMPUTE_ITERS         10

#define NWAITCHANS 12
static struct wchan *waitchans[NWAITCHANS];  /* N distinct wait channels */

static volatile int wakerdone;
static struct semaphore *wakersem;
static struct semaphore *donesem;

static
void
setup(void)
{
        char tmp[16];
        int i;

        if (wakersem == NULL) {
                wakersem = sem_create("wakersem", 1);
                donesem = sem_create("donesem", 0);
                for (i=0; i<NWAITCHANS; i++) {
                        snprintf(tmp, sizeof(tmp), "wc%d", i);
                        waitchans[i] = wchan_create(kstrdup(tmp));
                }
        }
        wakerdone = 0;
}

static
void
sleepalot_thread(void *junk, unsigned long num)
{
        int i, j;

        (void)junk;

        for (i=0; i<SLEEPALOT_PRINTS; i++) {
                for (j=0; j<SLEEPALOT_ITERS; j++) {
                        struct wchan *w;

                        w = waitchans[random()%NWAITCHANS];
                        wchan_lock(w);
                        wchan_sleep(w);
                }
                kprintf("[%lu]", num);
        }
        V(donesem);
}

static
void
waker_thread(void *junk1, unsigned long junk2)
{
        int i, done;

        (void)junk1;
        (void)junk2;

        while (1) {
                P(wakersem);
                done = wakerdone;
                V(wakersem);
                if (done) {
                        break;
                }

                for (i=0; i<WAKER_WAKES; i++) {
                        struct wchan *w;

                        w = waitchans[random()%NWAITCHANS];
                        wchan_wakeall(w);

                        thread_yield();
                }
        }
        V(donesem);
}

static
void
make_sleepalots(int howmany)
{
        char name[16];
        int i, result;

        for (i=0; i<howmany; i++) {
                snprintf(name, sizeof(name), "sleepalot%d", i);
                result = thread_fork(name, NULL, sleepalot_thread, NULL, i);
                if (result) {
                        panic("thread_fork failed: %s\n", strerror(result));
                }
        }
        result = thread_fork("waker", NULL, waker_thread, NULL, 0);
        if (result) {
                panic("thread_fork failed: %s\n", strerror(result));
        }
}

static
void
compute_thread(void *junk1, unsigned long num)
{
        struct matrix {
                char m[DIM][DIM];
        };
        struct matrix *m1, *m2, *m3;
        unsigned char tot;
        int i, j, k, m;
        uint32_t rand;

        (void)junk1;

        m1 = kmalloc(sizeof(struct matrix));
        KASSERT(m1 != NULL);
        m2 = kmalloc(sizeof(struct matrix));
        KASSERT(m2 != NULL);
        m3 = kmalloc(sizeof(struct matrix));
        KASSERT(m3 != NULL);

        for (m=0; m<COMPUTE_ITERS; m++) {

                for (i=0; i<DIM; i++) {
                        for (j=0; j<DIM; j++) {
                                rand = random();
                                m1->m[i][j] = rand >> 16;
                                m2->m[i][j] = rand & 0xffff;
                        }
                }
                
                for (i=0; i<DIM; i++) {
                        for (j=0; j<DIM; j++) {
                                tot = 0;
                                for (k=0; k<DIM; k++) {
                                        tot += m1->m[i][k] * m2->m[k][j];
                                }
                                m3->m[i][j] = tot;
                        }
                }
                
                tot = 0;
                for (i=0; i<DIM; i++) {
                        tot += m3->m[i][i];
                }

                kprintf("{%lu: %u}", num, (unsigned) tot);
                thread_yield();
        }

        kfree(m1);
        kfree(m2);
        kfree(m3);

        V(donesem);
}

static
void
make_computes(int howmany)
{
        char name[16];
        int i, result;

        for (i=0; i<howmany; i++) {
                snprintf(name, sizeof(name), "compute%d", i);
                result = thread_fork(name, NULL, compute_thread, NULL, i);
                if (result) {
                        panic("thread_fork failed: %s\n", strerror(result));
                }
        }
}

static
void
finish(int howmanytotal)
{
        int i;
        for (i=0; i<howmanytotal; i++) {
                P(donesem);
        }
        P(wakersem);
        wakerdone = 1;
        V(wakersem);
        P(donesem);
}

static
void
runtest3(int nsleeps, int ncomputes)
{
        setup();
        kprintf("Starting thread test 3 (%d [sleepalots], %d {computes}, "
                "1 waker)\n",
                nsleeps, ncomputes);
        make_sleepalots(nsleeps);
        make_computes(ncomputes);
        finish(nsleeps+ncomputes);
        kprintf("\nThread test 3 done\n");
}

int
threadtest3(int nargs, char **args)
{
        if (nargs==1) {
                runtest3(5, 2);
        }
        else if (nargs==3) {
                runtest3(atoi(args[1]), atoi(args[2]));
        }
        else {
                kprintf("Usage: tt3 [sleepthreads computethreads]\n");
                return 1;
        }
        return 0;
}