47 lines
3.2 KiB
Plaintext
47 lines
3.2 KiB
Plaintext
[video output=day123 member=cmuratori stream_platform=twitch stream_username=handmade_hero project=code title="Interlocked Operations" vod_platform=youtube id=_olNhuuRYxo annotator=dspecht annotator=Miblo]
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[2:33][Blackboard: Thread Synchronization / Communication]
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[3:31][Blackboard: Processes]
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[4:08][Blackboard: Threads]
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[5:22][Blackboard: Problem #1 - Knowing what work to do]
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[7:05][Blackboard: Problem #2 - Sync / When work is done / visible]
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[11:15][Blackboard: Conceptualising how threads work]
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[12:34][Blackboard: Doing a busy-wait loop]
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[16:19][Blackboard: Preventing multiple threads from doing the same work]
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[18:57][Blackboard: x64 provides special instructions]
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[19:46][Blackboard: "locked exchange"]
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[24:00][Blackboard: "interlocked compare exchange"]
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[26:51][Put on the Pig Hat]
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[28:43][Blackboard: Being slyfox with the other primitives][quote 96]
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[30:02][Blackboard: "reads and writes" in a multithreaded context]
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[31:56][Blackboard: cache lines]
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[39:34][Take off the Pig Hat and open the code]
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[40:17][win32_handmade.cpp: Make four threads that do different work]
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[42:41][Run Handmade Hero]
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[42:57][Make the threads look for work to do]
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[48:51][Run and inspect the debug output]
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[50:17][Moment of realisation: You need to let ThreadInfo values persist]
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[51:38][Inspect the output]
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[52:32][Explain what's happening]
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[54:50][The writes to EntryCount are not in order]
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[57:04][The reads are not in order]
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[58:14][Q&A][:speech]
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[58:40][@tenbroya][Is your use of "for (;;)" instead of "while(1)" a stylistic choice or is there a benefit / drawback I'm missing?]
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[1:00:17][@gasto5][What's the problem with not being interlocked and seeing the same value, as your "TODO" suggests?]
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[1:02:39][Blackboard: Why two threads did the same work]
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[1:05:29][@quikligames][Do mutexes that I've seen used for multithreaded code in other places rely on those interlocking instructions, or are they something completely different?]
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[1:06:23][@emanresuon][What is your opinion on lockless queues?]
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[1:08:18][@sedihglow][What's the point of an infinite loop to begin with? It ends at some point, doesn't it?]
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[1:08:46][@my_twitch_sn][What threading libraries do you recommend and why (e.g. boost or pthreads)?]
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[1:09:37][@lavisan][What's better: a job scheduler from where each thread can get a job, or separate queues for each thread?]
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[1:10:45][Blackboard: "Single producer / Single consumer" vs "Single producer / Multiple consumer"]
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[1:14:39][@pseudonym73][I think that the point of "lockless" is that it doesn't use an operating system-level lock]
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[1:14:55][Blackboard: "lock free"]
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[1:16:46][@rygorous][Hey Casey, an InterlockedIncrement is a lock-free operation! (The terminology is shitty. The original term is "non-blocking" which is more useful)]
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[1:17:40][@gasto5][Is it reasonable to synchronize the receiving of network packets on one synchronized thread?]
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[1:19:16][@cubercaleb][Later in the development cycle, will you go over threading for other operating systems like Mac and Linux?]
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[1:19:45][@rc1290][What are the advantages of having a queue of jobs, instead of creating a thread every time you add a job?]
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[1:20:04][Blackboard: Overlap vs Performance]
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[1:24:50][Recap and glimpse into the future][:speech]
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[1:28:08][Close things down][:speech]
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[/video]
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