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/**
* @file racer.c
*
* @brief a very strenuous test of mutexes, condition variables, and semaphores
*
* @author Peter Nelson <pnelson>
*
* This creates <threads> number of threads. Each thread gets 1 line of the
* terminal. Every thread attempts to aquire the semaphore which was
* initialized with a value of <semaphores>. When a thread aquires the sem
* it prints out <runlength> number of characters, one at a time.
*
* There is an additional <pausetime> that can be used to cause each thread
* to call sleep of that value. Finally there is a "bad" thread that
* cycles misbehave states and then sleeps for <misbehavetime>.
*
* The expected default result is seeing a group of 12 threads run out for 5
* characters. Then the next group of 12 threades will run out for 5 characters.
* The bottom-right corner shows the current number of threads that are active
* (should always be <=12) and the current misbehave state.
*
* threads and semaphores should be set to 24 and 12 for best effect
* runlength should be set to 5-10 to be able to see how many are active,
* or set to 1 for the most strenuous
*
* Colors are pseudo-randomly rotated by continuously adding get_ticks() to
* the color value. No real point other than to be trippy.
*
* Arguments: program threads runlength semaphores pausetime misbehavetime
*/
#include <thread.h>
#include <syscall.h>
#include <simics.h>
#include <stdio.h>
#include <sem.h>
#include <mutex.h>
#include <stdlib.h>
#define STACK_SIZE 4096
#define MAX_MISBEHAVE 64
// Uses my static initializer, you might have to change this
mutex_t lock_print;
// Default values
int threads = 24;
int run = 5;
int sems = 12;
sem_t sem;
int pause = 0;
int bad_sleep = 50;
char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
char empty[81];
mutex_t lock_running;
int running = 0;
char color = 0;
#define expect(exp) \
{ \
err = exp; \
if(err < 0) \
lprintf("%s:%u: returned %d", \
__FILE__, __LINE__, err); \
}
void *race(void *arg)
{
int err;
int col = -1;
int i;
int row = (int)arg;
mutex_lock(&lock_print);
color += get_ticks();
set_term_color(color);
expect(set_cursor_pos(row, 0));
printf("%s", &empty[0]);
mutex_unlock(&lock_print);
while(1)
{
sem_wait(&sem);
mutex_lock(&lock_running);
int r = ++running;
mutex_unlock(&lock_running);
if(r > sems)
lprintf("BAD! I have %d > %d threads running", r, sems);
mutex_lock(&lock_print);
expect(set_cursor_pos(24, 77));
printf("%.2d", running);
mutex_unlock(&lock_print);
for(i = 0; i < run; i++)
{
col++;
if(80 == col)
{
mutex_lock(&lock_print);
color += get_ticks();
set_term_color(color);
expect(set_cursor_pos(row, 0));
printf("%s", &empty[0]);
mutex_unlock(&lock_print);
col = 0;
}
mutex_lock(&lock_print);
color += get_ticks();
set_term_color(color);
expect(set_cursor_pos(row, col));
printf("%c", alphabet[i]);
mutex_unlock(&lock_print);
if(pause)
expect(sleep(pause));
thr_yield(-1);
}
mutex_lock(&lock_running);
running--;
mutex_unlock(&lock_running);
sem_signal(&sem);
}
}
void *bad(void *arg)
{
while(1)
{
int err;
int i = (int)arg;
for(i=-1; i<MAX_MISBEHAVE; i++)
{
lprintf("calling misbehave(%d)", i);
mutex_lock(&lock_print);
expect(set_cursor_pos(24, 73));
printf("% .2d", i);
mutex_unlock(&lock_print);
misbehave(i);
sleep(bad_sleep);
}
}
return arg;
}
int main( int argc, char *argv[] )
{
int i, err;
switch(argc) {
case 6:
i = atoi(argv[5]);
if(i >= 0)
bad_sleep = i;
/* FALLTHROUGH */
case 5:
i = atoi(argv[4]);
if(i >= 0)
pause = i;
/* FALLTHROUGH */
case 4:
i = atoi(argv[3]);
if(i > 0)
sems = i;
/* FALLTHROUGH */
case 3:
i = atoi(argv[2]);
if(i <= 26 && i > 0)
run = i;
/* FALLTHROUGH */
case 2:
i = atoi(argv[1]);
if(i > 1 && i <= 24)
threads = i;
/* FALLTHROUGH */
default:
break;
}
expect(thr_init(STACK_SIZE));
expect(mutex_init(&lock_print));
expect(mutex_init(&lock_running));
expect(sem_init(&sem, sems));
for(i=0; i<80; i++)
empty[i] = ' ';
empty[80] = '\0';
expect(thr_create(bad, (void*)i) >= 0);
for(i=0; i<threads; i++)
expect(thr_create(race, (void*)i) >= 0);
getchar();
expect(set_cursor_pos(24,0));
task_vanish(0);
}
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