/* University of California, Riverside - CS122B (Tony Givargis) */

/*--------------------------------------------------------------------------*/

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <vxWorks.h>
#include <sysLib.h>
#include <taskLib.h>
#include <string.h>

/*--------------------------------------------------------------------------*/

#define DELAY_IN_SECONDS(x)        taskDelay(x * 50);

/*--------------------------------------------------------------------------*/

/* These functions mimick the actual sensor readers */
double read_sensor_a(void) { return 32 + rand() % 76; }
double read_sensor_b(void) { return 16 + rand() % 50; }
double read_sensor_c(void) { return 44 + rand() % 93; }

/*--------------------------------------------------------------------------*/

typedef struct {
    
    /* these are sampled once per second */
    double sample_a[10];
    double sample_b[10];
    double sample_c[10];
    
    /* these are calculated from above once every 5 seconds */
    double average_a[2];
    double average_b[2];
    double average_c[2];
    
    /* these are calculated from the above once every 10 seconds */
    double average_a2;
    double average_b2;
    double average_c2;
    
    /* this is calculated from the above once every 10 seconds */
    double average;
} temperature_t;

/*--------------------------------------------------------------------------*/

int                 not_done;    /* used to signal the end of the program */
temperature_t       temperature; /* holds the sampled data */
SEM_ID              mutex;       /* used for mutual exclusion */

/*--------------------------------------------------------------------------*/

void task_a(void) {
    
    int buffer_index = 0;
    
    while( not_done ) {        /* activated once every 1 second */
        
	/* get sample and store in buffer (don't forget mutual exclusion) */
	
	/* update buffer index (local variable, so no need for mutex) */
        
        DELAY_IN_SECONDS(1);
    }
}

/*--------------------------------------------------------------------------*/

/* tasks b, c, d, e, f and g go here */

/*--------------------------------------------------------------------------*/

void prog_start(void) {                /* called to start the system */
    
    /* don't change these two lines */
    srand(100);
    
    /* initialize shared variables */
    not_done = 1;
    memset(&temperature, 0, sizeof(temperature));
    mutex = semBCreate(SEM_Q_FIFO, SEM_FULL);
    
    /* start tasks */        
    taskSpawn("simulator", 200, 0, 2000,
              (FUNCPTR)task_a,0,0,0,0,0,0,0,0,0,0);

    /* and so on .... */
}

/*--------------------------------------------------------------------------*/

void prog_stop(void) {                /* called to stop the system */
    
    not_done = 0;
    semDelete(mutex);
}