On 8/2/07, Joaquin M Lopez Munoz <joaquin@tid.es> wrote:
Hello Caleb, thank you for trying the preview and for your contributions! When you say you multithreading it's needed in Linux: what behavior do you observe otherwise? Also, could you provide me with the Linux version and compiler you're using?
I'm using gcc-4.1.3 on Debian/unstable. Without the <threading>multi, the gcc.link step fails for ip_allocator due to unresolved externals: gcc.link ../../../bin.v2/libs/multi_index/example/gcc-4.1.3 /debug/ip_allocator ../../../bin.v2/libs/multi_index/example/gcc-4.1.3/debug/ip_allocator.o: In function `mutexattr_wrapper': /home/cae/src/boost/libs/multi_index/example/../../../boost/interprocess/sync/posix/pthread_helpers.hpp:37: undefined reference to `pthread_mutexattr_init' /home/cae/src/boost/libs/multi_index/example/../../../boost/interprocess/sync/posix/pthread_helpers.hpp:37: undefined reference to `pthread_mutexattr_setpshared' /home/cae/src/boost/libs/multi_index/example/../../../boost/interprocess/sync/posix/pthread_helpers.hpp:37: undefined reference to `pthread_mutexattr_settype' ../../../bin.v2/libs/multi_index/example/gcc-4.1.3/debug/ip_allocator.o: In function `~mutexattr_wrapper': /home/cae/src/boost/libs/multi_index/example/../../../boost/interprocess/sync/posix/pthread_helpers.hpp:45: undefined reference to `pthread_mutexattr_destroy' ../../../bin.v2/libs/multi_index/example/gcc-4.1.3/debug/ip_allocator.o: In function `boost::interprocess::shared_memory_object::priv_open_or_create(boost::interprocess::detail::create_enum_t, char const*, boost::interprocess::mode_t)': /home/cae/src/boost/libs/multi_index/example/../../../boost/interprocess/shared_memory_object.hpp:316: undefined reference to `shm_open' collect2: ld returned 1 exit status Basically unless you link an executable with -pthread on Linux, the threading primitives are not available, and -lrt is required for the SysV shared memory primitives. Specifying "<threading>multi" seems to achieve both of these goals. This could be considered to be an issue with the interprocess library, but since it is header only and doesn't provide its own Jamfile, you can't add "/boost/interprocess" to the dependencies, and have it puck up that requirement AFAIK. If you look at the Jamfile.v2 in the interprocess example directory, you'll see it adds <threading>multi. -- Caleb Epstein