XK-1A thread sync

[cicga]

Hi all,

Any idea how to implement process like:

main ( master?) thread preparing data ( other threads waiting for it.

when data is ready main thread create some ready signal(?)

based on it secondary (slave?)threads reading data and send it into ports.

cicga

[MaxFlashrom]

Example edited to take account of Al's suggested corrections:

Do something like:

Code: Select all

// prototypes for forward reference
void masterFunk(chanend cout);
void slaveFunk(chanend cin);
out port myport = XS1_PORT_32A;

channel chan;

int main()
{
    par {
         masterFunk(chan);
         slaveFunk(chan);
    }
 
}

void masterFunk(chanend cout)
{
   int result;
   while(1) {
// do work
   cout <: result;
   }
}

void slaveFunk(chanend cin)
{
    int result;

    while(1) {
       cin :> result;
      myport <: result;
   }
}

Max

[Folknology]

Be careful about using 'master' and 'slave' as these are keywords in XC for Transactions. see the Programming XC PDF - http://www.xmos.com/published/programmi ... os-devices section 3.4. For your example maybe renaming the functions slavefunk and masterfunk so as not to confuse ;-)

regards
Al

[MaxFlashrom]

Be careful about using 'master' and 'slave' as these are keywords in XC for Transactions. see the Programming XC PDF - http://www.xmos.com/published/programmi ... os-devices section 3.4. For your example maybe renaming the functions slavefunk and masterfunk so as not to confuse ;-)

regards
Al

That'll teach me to just make stuff up without trying it in the XDE. The XDE syntax highlighter would have alerted me. I've not played with transactions much, so their reserved-word status didn't stick - either that or the mental FIFO just lost that detail after cramming in some new arcane fact. I did say "something like" the code above. One has allow some work for the reader although perhaps the resulting error would have been somewhat cryptic ;-)

Max.

[cicga]

MaxFlashrom,

this code is fine for single thread, but a problem is that I need several threads working from one "trigger" signal...

thanks
cicga

[MaxFlashrom]

Are the slave threads to receive different data from the master, or all the same data?
You can just extend the idea.

Code: Select all

int main()
{
    par {
         mThread(chan1, chan2, chan3, chan4);
         sThread1(chan1);
         sThread2(chan2);
         slhread3(chan3);
         slhread4(chan4);
    }

}

One can use arrays of channels and a replicator syntax to make this more elegant, but you get the idea, I hope. There is no "trigger signal" required. XMOS works on events. The threads sleep automatically until they receive data.

Max.

[cicga]

MaxFlashrom,

ideally threads should work with different arrays generated by one master ]
something like this:

master{
a[x]=x;
b[x]=x+2;
}

svale1{
y = a[x];
bla,bla...
}

slave2{
y = b[x];
bla bla...
}

:shock:
cicga

[MaxFlashrom]

MaxFlashrom,

threads should work with different arrays generated by one master

:shock:
cicga

Well, in your master thread send each chan a different piece of data, then

Code: Select all

for (n=0; n<10;  n++) {
  chan1 <: data[0][n];
  chan2 <: data[1][n];
  chan3 <: data[2][n];
  chan4 <: data[3][n];
}

Max

[cicga]

Max
thanks a lot - its working :D

cicga