User:NevilleDNZ/ALGOL 68

par: Parallel processing[edit]

ALGOL 68 supports programming of parallel processing. Using the keyword par, a collateral clause is converted to a parallel clause, where the synchronisation of actions is controlled using semaphores. In A68G the parallel actions are mapped to threads when available on the hosting operating system. In A68S a different paradigm of parallel processing was implemented (see below).

TEST Test test - with Algol_strict.css
TEST Test test - explicit desired.

PROC
    eat = VOID: ( muffins-:=1; print(("Yum!",new line))),
    speak = VOID: ( words-:=1; print(("Yak...",new line)));
 
INT muffins := 4, words := 8;
SEMA mouth = LEVEL 1;
 
PAR BEGIN
    WHILE muffins > 0 DO
        DOWN mouth;
        eat;
        UP mouth
    OD,
    WHILE words > 0 DO
        DOWN mouth;
        speak;
        UP mouth
    OD
END