pevents | Win32 events for * nix platforms | Command Line Interface library
kandi X-RAY | pevents Summary
kandi X-RAY | pevents Summary
While POSIX condition variables (pthread_cond_t) and WIN32 events both provide the essential building blocks of the synchronization primitives required to write multithreaded code with signaling, the nature of the differences between the two have lent their way towards creating different synchronization and multithreaded-programming paradigms. Developers accustomed to WIN32 events might have a hard time transitioning to condition variables; pevents aims to ease the transition for Windows developers looking to write multithreaded code on *nix by providing a familiar synchronization primitive that will allow them to duplicate the essential features of WIN32 auto/manual-reset events. As mentioned earlier, pevents provides most of the functionality of WIN32 events. The only features not included are only named events and support for security attributes. To the author's best knowledge, this is the only implementation of WIN32 events available for Linux and other posix platforms that provides support for simultaneously waiting on multiple events. Depending on your needs, we've been told that pevents may be used as a lightweight alternative to libuv/libev while still allowing your code to embrace asynchronous event handling with ease.
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QUESTION
In 7.5, the Vulkan spec says about vkCmdWaitEvents
The first synchronization scope only includes event signal operations that operate on members of
pEvents
, and the operations that happened-before the event signal operations. Event signal operations performed byvkCmdSetEvent
that occur earlier in submission order are included in the first synchronization scope, if the logically latest pipeline stage in theirstageMask
parameter is logically earlier than or equal to the logically latest pipeline stage insrcStageMask
.
I'm confused by this phrasing. Does this mean the first synchronization scope is the signalling of events that are passed in to pEvents
, plus any events that are submitted earlier and meet the stage mask and submission order requirement, or is it event signals are both passed in and meet the requirement?
In either case, since you can just pass in events with pEvents
, what is srcStageMask
is useful for?
ANSWER
Answered 2022-Jan-25 at 01:10The first synchronization scope only includes event signal operations that operate on members of
pEvents
, and the operations that happened-before the event signal operations.
The first scope of vkCmdWaitEvents
is only the hypothetical signal on the pEvent
(and all the stuff that happens-before it transitively, as would be defined by whatever signaled the event).
Event signal operations performed by
vkCmdSetEvent
that occur earlier in submission order are included in the first synchronization scope, [...]
vkCmdSetEvent
cannot be reordered past vkCmdWaitEvents
by the driver. It would basically be a broken if it did. I.e. if you call:
QUESTION
I am trying to set up an encoder IMFTransform. In this case, it happens to be NVENC H264 Encoder. However, IMFTransform::SetInputType()
is not working for ConfigureEncoder()
, and is returning MF_E_TRANSFORM_TYPE_NOT_SET
. This behavior does not occur in the ConfigureColorConversion()
function, despite the code being nearly identical. I have tried just about everything and it has not helped at all.
ANSWER
Answered 2022-Jan-03 at 16:16
MF_E_TRANSFORM_TYPE_NOT_SET
You must set the output types before setting the input types.
This is behavior by design. You would normally buuild the pipeline along the data flow, but in the case of encoder it's typically reverse for reasons I am omitting here. The error code, as documented, gives you a hint that you need to SetOutputType
first and then you would be able to do SetInputType
.
Even though Video Processor MFT is also an MFT, it's type setting is more relaxed.
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