tasking?

[wboeke]

Could you please give an example of how sender and receiver (from tasking.f) can operate?

[pahihu]

Hi,

Sure. You should check out the updated example in tt.f

Regards, pahihu

On 2023. Sep 21., at 11:44, W.Boeke @.***> wrote:

Could you please give an example of how sender and receiver (from tasking.f) can operate?

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[wboeke]

There's a problem: the program stumbles over the very first word in tt.f: |1|. It does not know the meaning of this, and I don't either.

[pahihu]

Yes there is a problem, because the last version of tt.f does not contain the word |1|. It runs fine on macOS 10.13 32/64bit and CentOS 7 32bit/64bit.

On 2023. Sep 22., at 7:18, W.Boeke @.***> wrote:

There's a problem: the program stumbles over the very first word in tt.f: |1|. It does not know the meaning of this, and I don't either.

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[wboeke]

I tried the latest version of vfc. In my naivity I tried the following:

./vfc run.f tasking.f s( hello) receive send

Result: nothing Please neglect my ignorance, and tell me what to do.

[pahihu]

Hi,

You should define the tasks with TASK, then BUILD them and finally ACTIVATE. Then start the round-robin scheduler with RR.

Ok, I will dissect the example tt.f here.

Define the tasks with TASK and BUILD them. TASK allocates the necessary data structure, BUILD links the task into the round-robin scheduler, but the default action is PASS, ie. do nothing.

        |s| |r| task t1  t1 build
        |s| |r| task t2  t2 build

Helper word, just to clear a variable:

        : off ( a)   0 swap ! ;

Clear the 1st tasks SENDER variable, that signals, it is able to receive any message. Then activate the task with T1 ACTIVATE. This sets the task to WAKE and execute the words behind ACTIVATE. The tasks still not runs, just it setup in the round-robin task chain.

        : run1
           t1 sender 's off  t1 activate

Begin the loop, print the current iteration number, then print “hello”:

           0
           begin
              cr dup . ." hello”

Send the current iteration number to task T2 and receive the result, it drops the ‘from’ (ie. T2):

              t2 send  receive drop

It is done in an infinite loop:

           0 until ;

Clear the 2nd tasks SENDER variable to receive messages, and activate the task. It is the same as in the case of the 1st task:

        : run2
           t2 sender 's off  t2 activate

Then in an infinite loop receive a message, and print “world”, then PAUSE:

           begin
              receive ( msg from) >R
              ." world” pause

Increment the iteration count by 1 and send back to the sender task (ie. T1):

              1+ R> send

Do it in an infinite loop:

           0 until ;

The word RUN is just a helper, it calls RUN1 and RUN2 to ACTIVATE the tasks, and starts the round-robin scheduler with RR:

        : run   run1 run2 rr ;

So, how to send the word “hello” to myself in an ifinite loop?

|s| |r| task t1 t1 build

: run1 0 t1 sender 's ! t1 activate c" hello" tid send begin receive >R dup count cr type R> send 0 until ;

: run run1 rr ;

On 2023. Sep 26., at 15:44, W.Boeke @.***> wrote:

I tried the latest version of vfc. In my naivity I tried the following:

./vfc run.f tasking.f s( hello) receive send

Result: nothing Please neglect my ignorance, and tell me what to do.

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[wboeke]

It works! I modified it such that only 10 "hello world" messages are sent. But after all: for me this is black magic!

[pahihu]

Great!

The black magic is in the words WAKE and STOP. WAKE restores the stack pointers of a task and begins execution where it left. STOP saves the stack pointers of the task and calls the scheduler to execute the next task in the circular task list.

Regards, pahihu

On 2023. Sep 26., at 19:20, W.Boeke @.***> wrote:

It works! I modified it such that only 10 "hello world" messages are sent. But after all: for me this is black magic!

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