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Marco Realacci 2025-03-12 11:14:27 +01:00
parent 6bd7ddb752
commit 19763a4483
2 changed files with 10 additions and 4 deletions
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10
Concurrent Systems/notes/4 - Semaphores.md
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@ -101,7 +101,7 @@ B.consume() :=
B.produce(v) :=
FREE.down()
SP.down()
while not EMPTY[in] do # there is at least an EMPTY cell, otherwise it would have been blocked
while not EMPTY[in] do
IN <- (IN+1) mod k
i <- IN
EMPTY[IN] <- ff
@ -123,4 +123,10 @@ B.consume() :=
EMPTY[o] <- tt
FREE.up()
return tmp
```
```
Thanks to the semaphores, we are sure that while loops will not go on forever! The loops starts only if there is at least a FREE / BUSY cell.
#### (Multiple) Producers/Consumers - Wrong solution
EXERCISE - will do later
#### The Readers/Writers problem