Hi everybody! Here is my problem : I wrote a c++ program on Linux which uses the pthread library to handle several requests of several clients. Each request executes an algo in which some parts, some loops, are parallelized with openmp (on 2 processors). I compile my program with gcc 4.3. With one request, so with one tread created by pthread lib, there is no problem, the execution is ok, and I have no problem with the openmp directives. But, when I execute my code with several requests, a deadlock, or a segmentation fault, occurs at execution, in the openmp part. I have already searched for a solution on the web, and on this forum too, I found some answers saying that there is a problem with gcc 4.2 and 4.3 and openmp with multithreading, so I try with gcc 4.5 but it doesn't correct the problem. There is no error in my code, in the declarations of my variables, in the openmp directives,... and I really think it is due to gcc because the code works when I compile it with the intel c compiler. More precisions on the problem : I have simplified my code as far as possible (sorry if it is still too big) to keep only the part where the problem occurs. Consequently, the program does nothing so don't try to understand its goal :-D (normally it's an algo to make some operations on images). I have put some comments in the code to help, and I have precised where the problem occurs in Classe2.cpp. I work on Linux (version debian 2.6.26 amd64) and compile with the lines at the beginning of main.cpp. Other packages are necessary to make the code works : -libmagick++, -libgraphicsmagick++, -graphicsmagick, -CImg (http://cimg.sourceforge.net/download.shtml) : copy the CImg.h downloaded file in the directory with my source files. The source files: http://old.nabble.com/file/p29173546/main.cpp main.cpp http://old.nabble.com/file/p29173546/Classe1.cpp Classe1.cpp http://old.nabble.com/file/p29173546/Classe1.h Classe1.h http://old.nabble.com/file/p29173546/Classe2.cpp Classe2.cpp http://old.nabble.com/file/p29173546/Classe2.h Classe2.h http://old.nabble.com/file/p29173546/Classe3.cpp Classe3.cpp http://old.nabble.com/file/p29173546/Classe3.h Classe3.h And the two images used: http://old.nabble.com/file/p29173546/image1.jpg http://old.nabble.com/file/p29173546/image2.jpg Normally, with all of that, it would compile with no problem and you will be able to test it :-). I know there is a lot of things (big code, packages to install,... in addition maybe I am not clear in my explanations %-|) but I would greatly appreciate some help :-). Thanks -- View this message in context: http://old.nabble.com/Problem-with-an-openMP-and-pthread-program-compiled-with-gcc-tp29173546p29173546.html Sent from the gcc - Help mailing list archive at Nabble.com.
