Ticket Mutexes — Handmade Hero — Episode Guide

0:23Recap and set the stage for the day

1:31Blackboard: Ticket Taking

4:11Blackboard: Singly-linked list

6:45Blackboard: A way to atomically add to a linked list

7:44Blackboard: Removing from a list

9:36Blackboard: Multithreaded addition to linked lists

11:46Blackboard: Multithreaded removal from linked lists

13:29Blackboard: Ticket Taking as a way to implement a fast, simple mutex for little chunks of code

14:37Blackboard: Atomic compare exchange¹

17:41Blackboard: Atomic increment

19:02Blackboard: Ticket Taking and Mutex (mutual exclusion)

22:57Blackboard: volatile int mutex^α

27:39Blackboard: Annoyingly, this implementation provides no guarantee that any thread will ever get a turn

30:04Blackboard: Ticket Taking as a way to ensure that threads get retired in order

35:12handmade_shared.h: Introduce struct ticket_mutex, BeginTicketMutex() and EndTicketMutex()

39:37handmade_asset.cpp: Implement AddOp()

42:49handmade_platform.h: Introduce and add a platform_texture_op_queue to the game_memory struct for AddOp() to use

45:48handmade_asset.cpp: Consider not setting Work->Asset->State in LoadAssetWorkDirectly()

47:21handmade_asset.cpp: Continue implementing AddOp()

49:56handmade_platform.h: Move the ticket mutex in from handmade_shared.h

51:23Consider building separate lists for each threads inside task_with_memory

52:25handmade_asset.cpp: Add platform_texture_op_queue to load_asset_work and pass it to the necessary functions

55:54Run the game and hit the assertion in AddOp()

56:12win32_handmade.cpp: Make WinMain() populate the TextureOps free list

58:53handmade_opengl.cpp: Make OpenGLManageTextures() return a texture_op

59:37win32_handmade.cpp: Make WinMain() call OpenGLManageTextures() inside a mutex

1:01:15"You ALMOST only live once"^β

1:04:49Run the game and see that it almost worked

1:05:06Q&A

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1:05:06Q&A

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1:05:06Q&A

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1:05:50handmade_asset.cpp: Note that we haven't dealt with Work->Asset->State

1:07:07dmitsuki Handmade Vulkan renderer when?

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1:07:07dmitsuki Handmade Vulkan renderer when?

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1:07:07dmitsuki Handmade Vulkan renderer when?

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1:07:21ezysigh Do you need a safety write barrier before the current ticket increment (inside mutex_unlock)?

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1:07:21ezysigh Do you need a safety write barrier before the current ticket increment (inside mutex_unlock)?

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1:07:21ezysigh Do you need a safety write barrier before the current ticket increment (inside mutex_unlock)?

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1:09:07phort99 Do you use an sRGB framebuffer and / or premultiplied alpha?

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1:09:07phort99 Do you use an sRGB framebuffer and / or premultiplied alpha?

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1:09:07phort99 Do you use an sRGB framebuffer and / or premultiplied alpha?

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1:10:20win32_handmade.cpp: Remove Win32GetThreadStartupForGL()

1:11:24Run the game and note that our texture loading bug is 100% reproducible

1:12:01phort99 Can you explain about the secondary framebuffer not being premultiplied? What's the secondary framebuffer for?

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1:12:01phort99 Can you explain about the secondary framebuffer not being premultiplied? What's the secondary framebuffer for?

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1:12:01phort99 Can you explain about the secondary framebuffer not being premultiplied? What's the secondary framebuffer for?

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1:13:05caviar_liberta And it might be pointless to do but, since you are using C++, have you used any ASM calls inside your code?

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1:13:05caviar_liberta And it might be pointless to do but, since you are using C++, have you used any ASM calls inside your code?

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1:13:05caviar_liberta And it might be pointless to do but, since you are using C++, have you used any ASM calls inside your code?

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1:14:23baramordax Is there a reason you're not using scoped mutex guards that handle unlocking whenever the guard goes out of scope?

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1:14:23baramordax Is there a reason you're not using scoped mutex guards that handle unlocking whenever the guard goes out of scope?

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1:14:23baramordax Is there a reason you're not using scoped mutex guards that handle unlocking whenever the guard goes out of scope?

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1:14:38win32_handmade.cpp: Demo the difference between our mutex and a scoped mutax guard

1:17:48Wrap it up with a few words on what is likely going wrong with the texture loading

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1:17:48Wrap it up with a few words on what is likely going wrong with the texture loading

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1:17:48Wrap it up with a few words on what is likely going wrong with the texture loading

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