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Questions - semaphore

Does one need to declare java synchronization mechanisms (locks, ,semaphores etc) as volatile?

If a lock/semaphore is being used by multiple threads for synchronization, does one need to declare it as volatile? Are the member variables of locks/semaphores itself guaranteed to reflect the latest...
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Gaurav

java

multithreading

locking

semaphore

Votes: 0

Answers: 2

Latest Answer

Typically you want to make the lock final because once the lock instance is set, you don't want to change it. But for discussion's sake, if you don't want to make it final, it is in most cases fine if...
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pveentjer

Will semaphore corrupt data transmission of peripherals like UART in a microcontroller?

Semaphore disables interrupts and so will this cause other operations like receiving data on SPI to get corrupt?
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Joseph Stephen

embedded

microcontroller

semaphore

freertos

Votes: 0

Answers: 2

Latest Answer

There's no standard way of implementing a semaphore. To disable all interrupts on the MCU is one way to do it, but it's a very poor amateur way of doing so. Because in more complex applications with m...
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Lundin

How to recreate swapchain after vkAcquireNextImageKHR is VK_SUBOPTIMAL_KHR?

This vulkan tutorial discusses swapchain recreation: You could also decide to [recreate the swapchain] that if the swap chain is suboptimal, but I've chosen to proceed anyway in that case because we'...
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Drew

semaphore

vulkan

Votes: 0

Answers: 1

Latest Answer

Ad 3: you can use the old images (and swapchain) if you properly use the oldSwapchain parameter when creating the new swapchain. Which is what I assume the tutorial suggests. Anyway. What I do is that...
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krOoze

Where and how are semaphores in PHP stored

I am curious about where and how PHP stores semaphores in context of sharing them within the application. From what I was able to understand from documentation, they use shared memory. Since container...
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HubertNNN

php

linux

semaphore

shared-memory

Votes: 0

Answers: 0

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