- #MMCSS DLL DOWNLOAD WINDOWS 10 MMCSS.DLL REGISTRATION#
- #MMCSS DLL DOWNLOAD WINDOWS 10 MMCSS.DLL PRO#
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What life is there, why didnt the swordfish come? Also, what are these? Edward looked at the seven people and then asked. With him as a reference, the headquarters can study the old sinners. Wdmaud.drv!`CWaveHandle::Open’::`2′::COpenJob::WorkĪvrt.Not mentioning the fact that Xi Sa has seized the time to recover. In my local testing (I just used echo ^G from a command prompt) I was able to see a Microsoft-Windows-MMCSS/Thread_Join/ event with this stack (only the bold part is interesting)
#MMCSS DLL DOWNLOAD WINDOWS 10 MMCSS.DLL REGISTRATION#
This will shed light on what processes and threads are registering with MMCSS.Īlso, ETW supports grabbing a stack at the point of an event being logged! This will shed light on whether the registration is happening from app code directly, or a plugin, or whatever. In particular, when a task is created, the Microsoft-Windows-MMCSS provider logs a Thread_Join event. MMCSS has “Event Tracing for Windows” (ETW) logging. Welcome back! A bunch of different theories started popping up in my head, like “maybe some other process on the system is consuming all the MMCSS slots”, or “maybe a plugin for the application is registering threads without the application developer’s knowledge”, or “maybe the call to AvRevertMmThreadCharacteristics isn’t happening”, or “maybe the task handle is being overwritten between Set and Revert”.īut then I remembered Raymond Chen’s advice: Theorize if you want, but if the problem is right there in front of you, why not go for the facts?
#MMCSS DLL DOWNLOAD WINDOWS 10 MMCSS.DLL PRO#
I got an email from a pro audio application developer who said that AvSetMmThreadCharacteristics was giving an ERROR_TOO_MANY_THREADS error in his app… even though he only registered a single thread with MMCSS! Surely one thread is not too many…Īt this point you should pause and read the excellent book One Kitten is Not Too Many. This is the preferred approach for apps which want to use low-level APIs. In Windows 8.1, the Real-Time Work Queue API was created. It’s very important to note that apps which called into high-level audio and video APIs (e.g., the and HTML tags) don’t have to worry about this kind of thing the implementation of the high-level API takes care of registering the right pieces of its code with MMCSS.įor apps which (for one reason or another) choose not to use the high-level APIs, and instead want to hook into low-level APIs directly, the original design was for the app to call AvSetMmThreadCharacteristics function from its streaming thread when streaming begins, and AvRevertMmThreadCharacteristics when streaming ends. The bursts are regular so that audio and video packets don’t get delayed, and they are short so that non-multimedia activity doesn’t get starved. This is designed to give audio and video threads regular, short, bursts of very high priority, so that audio and video can stream without glitching. Windows Vista introduced a feature called the “Multimedia Class Scheduler Service” (MMCSS).
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