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.NET Forum / Languages / C++ Libraries / April 2005SetThreadIdealProcessor Compile Error
Hello. I'm running VC++ .NET 2002 SP1 and creating a quick DOSbox program to calculate FFT's on data sets. Basically, open data file, load arrays, compute FFT's on arrays, and write the resultant data to disk. I have successfully created and am using two threads to simultaneously compute the FFT's on two processors (dual xeon system). But, I cannot use the SetThreadIdealProcessor function on my thread handles. I get a compile error of 'SetThreadIdealProcessor undeclared identifier'. Sometimes WinXPpro does not schedule the threads properly and they run slowly (as seen via task manager). Why is the error occurring because I can see the declaration of the function in the proper header file? And, yep, I'm using the correct compiler settings for multithreading... Any explanations? Should I use SetThreadAffinityMask instead? If so, what is the format of the mask? Thanks! Joe >Hello. I'm running VC++ .NET 2002 SP1 and creating a quick DOSbox program >to calculate FFT's on data sets. Basically, open data file, load arrays, [quoted text clipped - 13 lines] >Any explanations? Should I use SetThreadAffinityMask instead? If so, what >is the format of the mask? From the docs for SetThreadIdealProcessor(): "To compile an application that uses this function, define the _WIN32_WINNT macro as 0x0400 or later. For more information, see Using the SDK Headers." -- Phillip Crews aka Severian Microsoft MVP, Windows SDK Posting email address is real Hello and thank you for the response. I forgot to mention that. I did try placing at the very beginning of my source file, prior to all the .h includes: #define _WIN32_WINNT >= 0x0501 #define WINVER >= 0x0501 Which are the values for WindowsXP and I learned this from the http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winprog/winprog /using_the_windows_headers.asp webpage. Did I do this incorrectly? Thanks again, Joe >>Hello. I'm running VC++ .NET 2002 SP1 and creating a quick DOSbox program >>to calculate FFT's on data sets. Basically, open data file, load arrays, [quoted text clipped - 28 lines] > Microsoft MVP, Windows SDK > Posting email address is real > Hello and thank you for the response. > [quoted text clipped - 3 lines] > #define _WIN32_WINNT >= 0x0501 > #define WINVER >= 0x0501 Upps... You must define a *specific* value! #define _WIN32_WINNT 0x0501 #define WINVER 0x0501  SignatureGreetings Jochen My blog about Win32 and .NET http://blog.kalmbachnet.de/ Heya! Thanks! Looks like I got it now... I'm new to multi-threading, having this new dual xeon system, so thank you for helping me with my ignorance. I did have to place the defines between the #include "stdafx.h" and #include "windows.h" It didn't work if I placed the defines at the very beginning of the source file. Perhaps stdafx.h remodifies my defines before it gets to windows.h?? Nonetheless, it compiled just great this time around! Thanks again. Much appreciated! Joe >> Hello and thank you for the response. >> [quoted text clipped - 9 lines] > #define _WIN32_WINNT 0x0501 > #define WINVER 0x0501 Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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