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vault backup: 2025-04-03 00:10:03

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Marco Realacci 2025-04-03 00:10:03 +02:00
parent 90e5cc1e91
commit 018560c352
2 changed files with 38 additions and 3 deletions
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6
.obsidian/workspace.json vendored
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@ -13,12 +13,12 @@
"state": { "state": {
"type": "markdown", "type": "markdown",
"state": { "state": {
"file": "Concurrent Systems/notes/4b - Monitors.md", "file": "Concurrent Systems/test/Untitled.md",
"mode": "source", "mode": "source",
"source": false "source": false
}, },
"icon": "lucide-file", "icon": "lucide-file",
"title": "4b - Monitors" "title": "Untitled"
} }
}, },
{ {
@ -206,8 +206,8 @@
}, },
"active": "7c5b0ca6f7687800", "active": "7c5b0ca6f7687800",
"lastOpenFiles": [ "lastOpenFiles": [
"Concurrent Systems/notes/4 - Semaphores.md",
"Concurrent Systems/notes/4b - Monitors.md", "Concurrent Systems/notes/4b - Monitors.md",
"Concurrent Systems/notes/4 - Semaphores.md",
"Concurrent Systems/notes/5 - Software Transactional Memory.md", "Concurrent Systems/notes/5 - Software Transactional Memory.md",
"Concurrent Systems/test/Untitled.md", "Concurrent Systems/test/Untitled.md",
"Concurrent Systems/notes/4c - Dining Philosophers.md", "Concurrent Systems/notes/4c - Dining Philosophers.md",

35
Concurrent Systems/test/Untitled.md
View file

@ -34,3 +34,38 @@ end_write() :=
GLOB_MUTEX.up() GLOB_MUTEX.up()
return return
``` ```
```
monitor RW_READERS :=
AR, WR, AW, WW init at 0
condition CR, CW, CR_PR
operation begin_read() :=
WR++
if WW != 0 then
CR_PR.wait()
if AW != 0 then
CR.wait()
CR.signal()
AR++
WR--
operation end_read() :=
AR--
if AR = 0 then
CW.signal()
operation begin_write() :=
WW++
if (AR + AW != 0) then
CW.wait()
AW++
WW--
operation end_write() :=
AW--
if WR > 0 then
CR.signal()
else
CW.signal()
```