I've made some changes to the Boost.Threads static linking support on Win32. Previously I had added back support for static linking, but without thread-specific storage classes. Now I've added the thread-specific storage classes back in, and exposed two functions that need to be called at the appropriate time: The function on_thread_exit() should be called when a thread exists, *in the context of the exiting thread*. The function on_process_exit() should be called when the process exit. If these functions are not called at the appropriate time, leaks may occur. If you know you don't need tss cleanup, of course you can just omit to call these functions. In addition, Boost.Threads static library on Win32 requires the user of the library to define a function called tss_cleanup_implemented(); if it is not defined, a link error results. The only purpose of this function is as a "link-time assertion": the linker error stating that the function is missing warns the the user of the necessity of calling the cleanup functions. In addition, if Boost.Threads later implements tss cleanup in the static library, the linker's duplicate symbol error should warn the user that their custom implementation is no longer needed. Comments? Mike