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pthread

Posted on 1999-01-23
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Hi:
I write a multi-thread application under Linux (Red Hat 5.1).
I use the pthread_create function. When I compile, it's OK. When I link the program, it said that that the pthread_create is unreferenced. So who will tel me what library should I link woth this program?
Who will offer me a makefile? (Just simple is OK)
Thanks.

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Question by:jonalee
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by:ozo
ID: 1296367
-lpthread
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grepya earned 150 total points
ID: 1296368
Some of the  libraries have to be linked in explicitly when you compile your program containing one of the functions from that library. The library names are of the form lib<name>.so
for dynamic library and lib<name>.a for static libraries. So if you want to link against a library ( statically or dynamically)
with the name lib<name>.a or lib<name>.so, you append -l<name>
as the last option of your compiler invokation
( eg. cc threadtest.c -lpthread ) Whether a static or a dynamic link is done depends on how the compiler's defaults have been set up. Nowadays dynamic linking is the default in most cases.

  In your case, you are using functions which reside in the file
/usr/lib/libpthread.so ( in the RedHat distro..) The compiler knows where to look for the library file or if you have your library file in some other location for some reason, you can
give the -L/unusual/path/  as a compiler option. ( you should read the man pages for gcc etc for more details.)
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