pthread in ubuntu 10.10

[Wandy]

I wrote lines in ubuntu including the function pthread.An error raised:no referrence to the pthread_create;

Then I googled it ,install the glibc-doc but no change in the result.I can't still man the pages about the pthread family function. Someone knows what is the matter?Please help me.Thank you in advance!!

[Galik]

Compile using the -pthreads flag. That may sort it out.

eg.

g++ -o myprog -pthreads myprog.cpp

[Wandy]

I tried it. It didn't work.

[Galik]

Can you provide the exact error message please?

[Wandy]

ok，“undefined reference to `pthread_create'” and I have included the header in it.

[Moschops]

Undefined reference indicates that your linker cannot find the library containing the actual function body. The header will generally contain the function prototype; the library contains the actual code that does the actual work.

You need to link to the threading library. On the command line, probably something like

-pthread

going by the man page ( http://www.kernel.org/doc/man-pages/online/pages/man3/pthread_create.3.html )

[Athar]

You need to link the pthread library, so it's -lpthread.
-pthread(s) implies -lpthread for the linker.

[hanst99]

No, just -pthread (or -pthreads, depending on your system).

That will link to pthreads and may cause other side effects as well. Just remember to use -pthread at the compiling AND at the linking stage.