> not thread safe if the involved profiles are file-based
it still crashes if I use USE_PTHREADS and cmsOpenProfileFromMem()
my reason for wanting to do this, is that cmsCreateTransform() can be quite
slow (as much as 1sec), and I often want to make multiple transforms.
note, if I use cmsCreate_sRGBProfile() instead of cmsOpenProfileFromXXX(),
it doesn't crash
Louis Solomon
www.SteelBytes.com
----- Original Message -----
From: "Marti.Maria" <[EMAIL PROTECTED]>
To: "Louis Solomon [SteelBytes]" <[EMAIL PROTECTED]>; "lcms-user"
<lcms-user@lists.sourceforge.net>
Sent: Thursday, June 07, 2007 6:08 PM
Subject: Re: [Lcms-user] cmsCreateTransform is not thread safe
>
>
> Hi Louis,
>
> Thanks for the report. Yes, you are right, cmsCreateTransform
> is not thread safe if the involved profiles are file-based. That is
> because files are not locked when readed. Currently, only
> cmsDoTransform() is thread safe, and strictly you have to
> turn on USE_PTHREADS toggle on lcms.h
>
> That is so because multithreading only make real sense when
> applying rerendering. But your point is well taken, and locking the
> file would be an interesting addition for next release, unfortunately
> not for 1.17 since I am already out of schedule.
>
> Thanks again.
> Marti
>
> ----- Original Message -----
> From: "Louis Solomon [SteelBytes]" <[EMAIL PROTECTED]>
> To: "lcms-user" <lcms-user@lists.sourceforge.net>
> Sent: Tuesday, June 05, 2007 8:13 AM
> Subject: [Lcms-user] cmsCreateTransform is not thread safe
>
>
> Hi,
> cmsCreateTransform is not thread safe using 1.16 or 1.17b. Note, using
> cmsCreate_sRGBProfile() instead of
> cmsOpenProfileFromFile("AdobeRGB1998.icc","rb") does work, and so does
> calling the two cmsCreateTransform()'s in succession. Test env: 32bit
> debug
> target built with VS2005 on Vista64.
>
> Louis Solomon
> www.SteelBytes.com
>
>
> #include <windows.h>
> #include "lcms\lcms.h"
>
> static cmsHPROFILE prof_xyz,prof_rgb;
> static cmsHTRANSFORM trans_xyz_to_rgb,trans_rgb_to_xyz;
>
> static DWORD WINAPI make_trans_xyz_to_rgb(LPVOID lpParameter)
> {
> trans_xyz_to_rgb = cmsCreateTransform(
> prof_xyz,TYPE_XYZ_DBL,
> prof_rgb,TYPE_RGB_DBL,
> INTENT_ABSOLUTE_COLORIMETRIC,cmsFLAGS_NOTPRECALC);
> return 0;
> }
>
> static DWORD WINAPI make_trans_rgb_to_xyz(LPVOID lpParameter)
> {
> trans_rgb_to_xyz = cmsCreateTransform(
> prof_rgb,TYPE_RGB_DBL,
> prof_xyz,TYPE_XYZ_DBL,
> INTENT_ABSOLUTE_COLORIMETRIC,cmsFLAGS_NOTPRECALC);
> return 0;
> }
>
> int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR
> lpCmdLine,int nCmdShow)
> {
> prof_xyz = cmsCreateXYZProfile();
> prof_rgb = cmsOpenProfileFromFile("AdobeRGB1998.icc","rb");
> //cmsCreate_sRGBProfile();
> for (int i=0;i<10;++i)
> {
> #define try_threads
> #ifdef try_threads
> DWORD threadid;
> HANDLE workers[2];
> workers[0] = CreateThread(NULL,0,make_trans_xyz_to_rgb,NULL,0,&threadid);
> workers[1] = CreateThread(NULL,0,make_trans_rgb_to_xyz,NULL,0,&threadid);
> WaitForMultipleObjects(2,workers,TRUE,INFINITE);
> for (unsigned i=0;i<2;++i)
> CloseHandle(workers[i]);
> #else
> make_trans_xyz_to_rgb(0);
> make_trans_rgb_to_xyz(0);
> #endif
> cmsDeleteTransform(trans_xyz_to_rgb);
> cmsDeleteTransform(trans_rgb_to_xyz);
> }
> cmsCloseProfile(prof_rgb);
> cmsCloseProfile(prof_xyz);
> }
>
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by DB2 Express
> Download DB2 Express C - the FREE version of DB2 express and take
> control of your XML. No limits. Just data. Click to get it now.
> http://sourceforge.net/powerbar/db2/
> _______________________________________________
> Lcms-user mailing list
> Lcms-user@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/lcms-user
>
>
-------------------------------------------------------------------------
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
http://sourceforge.net/powerbar/db2/
_______________________________________________
Lcms-user mailing list
Lcms-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/lcms-user
