Date: Thu, 31 Oct 2002 13:23:45 -0500 From: Alexander Kabaev <ak03@gte.com> To: Daniel Eischen <eischen@pcnet1.pcnet.com> Cc: dfr@nlsystems.com, tlambert2@mindspring.com, current@freebsd.org Subject: Re: [PATCH: libc]Re: gnome on current Message-ID: <20021031132345.0c6901a3.ak03@gte.com> In-Reply-To: <Pine.GSO.4.10.10210311211200.20637-100000@pcnet1.pcnet.com> References: <20021031161630.Q69202-100000@herring.nlsystems.com> <Pine.GSO.4.10.10210311211200.20637-100000@pcnet1.pcnet.com>
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On Thu, 31 Oct 2002 12:20:14 -0500 (EST) Daniel Eischen <eischen@pcnet1.pcnet.com> wrote: > I wonder how it works for Solaris (you can see both the non-underscore > and single-underscore symbols resolve to the same thing)? Perhaps their > stubs in libc pull the libgcc trick? Solaris libc uses something called ti_jmp_table to locate pthread symbols. Both _pthread and pthread functions resolve to the same stub which does something like this: 1) fetch a function pointer from the ti_jmp_table 2) jump to it. By default, ti_jump_table entries contain pointers to dummy function like _return_zero if no threading library is loaded. When the threading library is loaded, ti_jump_table is populated with new pointers to functions implemented in threading library library. GDB did not allow me to track down where exactly this happens, I presume .init function in libpthread.so does that. Just FYI. -- Alexander Kabaev To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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