On 19-May-2003 Robert Watson wrote: > > On Mon, 19 May 2003, Terry Lambert wrote: > >> Robert Watson wrote: >> > |-------------------+-------------+---------------+----------------------| >> > | | | | Update the run-time | >> > | rtld-elf | -- | Alexander | link editor (rtld) | >> > | thread-safety | | Kabaev | thread-safe with | >> > | | | | libpthread. | >> > |-------------------+-------------+---------------+----------------------| >> >> According to chapter 12 of the "Go Solo 2" book, this is a bogus thing >> to do. Callers are required to take a critical section over the calls >> to the dl* functions because the dlerror() function uses a static buffer >> that can be overwritten in a multi-threaded environment. > > Sadly, that insight doesn't seem to have influenced the development > practices of a number of major application vendors :-(. As Peter has mentioned before, simply locking calls to dlopen() in the application is not sufficient since every time you have to resolve a symbol when doing a call to a function for the first time, you hit the same data structures and need the locks in those cases as well. Assuming I recalled all that correctly. -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/Received on Tue May 20 2003 - 12:02:29 UTC
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