C precedence graph with semaphores

[C] precedence graph with semaphores - Printable Version

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precedence graph with semaphores - georgeziozas - Dec 20, 2020

🙃Hey there, I am working on system programming for the last weeks, and I'm trying to grasp some major concepts.
I am writing C in Linux OS.

P1 process code:

Code 
while(true){

print(P)

print(I)

}

P2 process code:

Code 
while(true){

print(Z)

}

P3 process code:

Code 
while(true){

print(A)

}

I have achieved to use P and V semaphores to print PIZZA once with the code below:

Code 
var Σ12, Σ13, Σ23: semaphores;

Σ12:= Σ13:= Σ23:= 0;

cobegin

begin Δ1; V(Σ12); V(Σ13); end;

begin P(Σ12); Δ2; V(Σ23);end;

begin P(Σ13);P(Σ23); Δ3;end;

coend

What if I want to use the same 3 semaphores to print :

Code 
PIZZAPIZZAPIZZAPIZZA.......

(forever).

Thanks in advance. ✌