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Marco Realacci 2025-03-21 18:50:08 +01:00
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.obsidian/workspace.json vendored
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@ -21,6 +21,22 @@
"title": "4b - Monitors" "title": "4b - Monitors"
} }
}, },
{
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"state": {
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"page": 14,
"left": -227,
"top": 577,
"zoom": 0.9
},
"icon": "lucide-file-text",
"title": "class 4"
}
},
{ {
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"type": "leaf", "type": "leaf",
@ -225,8 +241,9 @@
}, },
"active": "51157f32453cba69", "active": "51157f32453cba69",
"lastOpenFiles": [ "lastOpenFiles": [
"Concurrent Systems/notes/4 - Semaphores.md", "Concurrent Systems/slides/class 4.pdf",
"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/notes/2b - Round Robin algorithm.md", "Concurrent Systems/notes/2b - Round Robin algorithm.md",
"Concurrent Systems/notes/4c - Dining Philosophers.md", "Concurrent Systems/notes/4c - Dining Philosophers.md",
@ -247,7 +264,6 @@
"Pasted image 20250318090733.png", "Pasted image 20250318090733.png",
"Concurrent Systems/slides/class 5.pdf", "Concurrent Systems/slides/class 5.pdf",
"Concurrent Systems/notes/images/Pasted image 20250317105355.png", "Concurrent Systems/notes/images/Pasted image 20250317105355.png",
"Concurrent Systems/slides/class 4.pdf",
"Concurrent Systems/notes/images/Pasted image 20250317100456.png", "Concurrent Systems/notes/images/Pasted image 20250317100456.png",
"HCIW/slides/4 HUI2016-6-forcefeedback.pdf", "HCIW/slides/4 HUI2016-6-forcefeedback.pdf",
"HCIW/slides/3b Haptic slides.pdf", "HCIW/slides/3b Haptic slides.pdf",

3
Concurrent Systems/notes/4b - Monitors.md
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@ -34,7 +34,8 @@ Of course, `signal()` will have no effect on the last process who calls it.
- For every condition C, a semaphore SEMC init at 0 and an integer $N_{C}$ init at 0 (to store and count the number of suspended processes on the given condition) - For every condition C, a semaphore SEMC init at 0 and an integer $N_{C}$ init at 0 (to store and count the number of suspended processes on the given condition)
- A semaphore PRIO init at 0 and an integer $N_{PR}$ init at 0 (to store and count the number of processes that have performed a signal, and so have priority to re-enter the monitor) - A semaphore PRIO init at 0 and an integer $N_{PR}$ init at 0 (to store and count the number of processes that have performed a signal, and so have priority to re-enter the monitor)
Every monitor operation starts with `MUTEX.down()` and ends with `if NPR > 0 then PRIO.up() else MUTEX.up()` >[!note]Operations
>Every monitor operation starts with `MUTEX.down()` and ends with `if NPR > 0 then PRIO.up() else MUTEX.up()`
``` ```
C.wait() := C.wait() :=