#include    <errno.h>
#include    <stdio.h>
#include    <unistd.h>
#include    <sys/types.h>

#include "pa3.h"
/* Test of concurrent access errors.                    */
/* Two threads try to concurrently increment a counter.  Final counter  */
/* value should be 2000, but it won't be.               */

int value = 0;

void
worker_thread( void * ignore )
{
    int i;
    int x;
    for ( i = 0 ; i < 1000 ; i++ )
    {
        x = value;
        sched_yield();
        value = x + 1;
    }
    printf( "Worker thread %ld ends, value is %d.\n", thread_self(), value );
    //return 0;
}

int
main()
{
    thread_t        ignore;

    printf( "Cogito ergo sum.\n" );


    if ( thread_create( &ignore, worker_thread, (void*)ignore ) != 0 )
    {
        printf( "\x1b[2;31mpthread_create() failed file %s, line %d.\x1b[0m\n",
            __FILE__, __LINE__ );
        return 0;
    }
    else if ( thread_create( &ignore, worker_thread, (void*)ignore ) != 0 )
    {
        printf( "\x1b[2;31mpthread_create() failed file %s, line %d.\x1b[0m\n",
            __FILE__, __LINE__ );
        return 0;
    }
    else
    {
        while(1) { sched_yield(); }
        //thread_exit(0);
    }
}