[chuck-users] time goes backwards (and I don't like that)

[Robert Poor]

Okay: have built a fresh 1.2.1.2 AND a fresh 1.2.1.1 and observe the  
same error in both versions.  Here's a revised test program that  
nicely demonstrates that the problem lies with rounding: if the  
fractional part of now between 0.0 and 0.5 (inclusive), it rounds  
down.  If it is greater than 0.5, it rounds up.  And when the time is  
rounded up, it appears that yield() doesn't yield.
==============pasted code below==============
Event e;
spork ~ costello();
abbot();

fun void abbot() {
     while (1) {
         now + 44100.25::samp => time later;
         <<< "abbot(1):", now, later >>>;
         later => now;
         <<< "abbot(2):", now, later >>>;
         e.broadcast();
         <<< "abbot(3):", now, later >>>;
         me.yield();
         <<< "abbot(4):", now, later >>>;
     }
}

fun void costello() {
     while (1) {
         <<< "costello(1):", now >>>;
         e => now;
         <<< "costello(2):", now >>>;
     }
}
==============pasted output below==============
[poorbook15-8:Chuck/chuck-1.2.1.1-dev/src] r% ./chuck --version

chuck version: 1.2.1.1b (dracula)
    exe target: mac os x : powerpc
    http://chuck.cs.princeton.edu/

[poorbook15-8:Chuck/chuck-1.2.1.1-dev/src] r% ./chuck ~/bar.ck
abbot(1): 0.000000 44100.250000
costello(1): 0.000000
abbot(2): 44100.250000 44100.250000
abbot(3): 44100.250000 44100.250000
costello(2): 44100.000000 		 			// 0.25 rounded down
costello(1): 44100.000000
abbot(4): 44100.250000 44100.250000
abbot(1): 44100.250000 88200.500000
abbot(2): 88200.500000 88200.500000
abbot(3): 88200.500000 88200.500000
costello(2): 88200.000000 					// 0.5 rounded down
costello(1): 88200.000000
abbot(4): 88200.500000 88200.500000
abbot(1): 88200.500000 132300.750000
abbot(2): 132300.750000 132300.750000
abbot(3): 132300.750000 132300.750000
abbot(4): 132300.750000 132300.750000
abbot(1): 132300.750000 176401.000000
costello(2): 132301.000000 					// 0.75 rounded up, failed to yield
costello(1): 132301.000000
abbot(2): 176401.000000 176401.000000
abbot(3): 176401.000000 176401.000000
costello(2): 176401.000000 					// 0.0 behaves
costello(1): 176401.000000
abbot(4): 176401.000000 176401.000000
abbot(1): 176401.000000 220501.250000
abbot(2): 220501.250000 220501.250000
abbot(3): 220501.250000 220501.250000
costello(2): 220501.000000
costello(1): 220501.000000
abbot(4): 220501.250000 220501.250000
abbot(1): 220501.250000 264601.500000
abbot(2): 264601.500000 264601.500000
abbot(3): 264601.500000 264601.500000
costello(2): 264601.000000
costello(1): 264601.000000
abbot(4): 264601.500000 264601.500000
abbot(1): 264601.500000 308701.750000
   C-c C-c[chuck]: cleaning up...