![]() Case 2: Pauses ended after the wait completes. pause time needs to be added back at the end of wait Case 1: All pauses happened before the wait completes. Two cases exists, consider that 10 sec wait is issued pause duration has to be considered as "time that never existed". ![]() the wait has to be adjusted to account for the CLR Freeze. In case the CLR is paused inbetween a wait, this method calculates how much But, having informative comments like this one from coreclr/src/jit/lsra.cpp go some way to showing what it’s doing NET ‘Just-in-Time’ (JIT) Compiler have always been a bit of a mystery to me. When the target thread has delivered its context.įor more info on Dave Cutler, see this excellent interview ‘Internets of Interest #6: Dave Cutler on Dave Cutler’ or ‘The engineer’s engineer: Computer industry luminaries salute Dave Cutler’s five-decade-long quest for quality’ Get context delivers a APC to the target thread and waits on an event that will be set This seems to guarantee consistency.īut there are places we would like to avoid GetThreadContext, if it's safe and legal. Usually after we suspend a thread, we then call GetThreadContext. Running Win2K3 SP1 build 1421, we've seen two stress failures where SuspendThread returns while writes seem to still be in flight. Historically, we've assumed that the answer to both questions is No. Would be to use interlocked operations on the variable itself.Īfter SuspendThread returns, does the store buffer of the CPU for the suspended thread still need to drain? In this case even the memory barrier would not necessarily work - a better solution In this case the target thread will not suspend until the hardware switches back to executing instructions On a logical processor whose other logical processor is currently actually executing another thread. The suspended thread cannot execute any more user code, but it might be currently "running" Therefore there’s no better person to ask a deep, technical question about how Thread Suspension works on Windows, from coreclr/src/vm/threadsuspend.cppĪfter SuspendThread returns, can the suspended thread continue to execute code in user mode? There’s no art in this one, but it deserves it’s own category as it quotes the amazing Dave Cutler who led the development of Windows NT. To make the examples easier to browse, I’ve split them up into categories: If you’ve come across any interesting examples I’ve missed out, please let me know! Note: Yes, I shamelessly ‘borrowed’ this idea from John Regehr, I was motivated to write this because his excellent post ‘Explaining Code using ASCII Art’ didn’t have any. NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.” aspnet/AspNetCore - “ a cross-platform.dotnet/Roslyn - “ provides C# and Visual Basic languages with rich code analysis APIs”.It includes types for collections, file systems, console, JSON, XML, async and many others.” dotnet/CoreFX - “ the foundational class libraries for.Mono - “ open source ECMA CLI, C# and.It includes the garbage collector, JIT compiler, primitive data types and low-level classes.” So armed with a trusty regex I set out to find all the interesting ASCII Art used in source code comments in the following. To see what Matt’s CLR was all about you can watch the recording of my talk ‘From ‘dotnet run’ to ‘Hello World!’’ (from about ~24:30 in) Print ''.Who doesn’t like a nice bit of ‘ASCII Art’? I know I certainly do! I made a little more comprehensive example with functional style. If image.getpixel((colnum, rownum)): line.append(' '), Image = Image.new('1', size, 1) #create a b/w imageĭraw.text((0, 0), ShowText, font=font) #render the text to the bitmap Size = font.getsize(ShowText) #calc the size of text in pixels from PIL import Image, ImageFont, ImageDrawįont = uetype('arialbd.ttf', 15) #load the font You can render the text onto a b/w image and convert that bitmap to a string stream replacing the black and white pixels to chars. PIL gives a cool way to do this very simple.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |