marcorealacci/master-degree-notes
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

vault backup: 2025-04-06 16:58:00

Browse source
This commit is contained in:
Marco Realacci 2025-04-06 16:58:00 +02:00
parent 6e87cd5b03
commit 09d45ed1c5
2 changed files with 4 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

3
Concurrent Systems/notes/4 - Semaphores.md
View file

@ -299,5 +299,4 @@ def end_write() :=
W_MUTEX.up()
return
```
This is prioritizing writers as if there are writers waiting, they will be waiting at `GLOB_MUTEX.down()`. This semaphore is upped before `PRIO_MUTEX` which is the one that blocks readers.
But writers won't be able to writer until there are no readers, if they keep coming, they will block the writers as `GLOB_MUTEX` will never be upped.
This is prioritizing writers as if there are writers waiting, they will be waiting at `GLOB_MUTEX.down()`. This semaphore is upped before `PRIO_MUTEX` which is the one that blocks readers.