John Polstra d3980376e8 Add a new function dllockinit() for registering thread locking ... functions to be used by the dynamic linker. This can be called by threads packages at start-up time. I will add the call to libc_r soon. Also add a default locking method that is used up until dllockinit() is called. The default method works by blocking SIGVTALRM, SIGPROF, and SIGALRM in critical sections. It is based on the observation that most user-space threads packages implement thread preemption with one of these signals (usually SIGVTALRM). The dynamic linker has never been reentrant, but it became less reentrant in revision 1.34 of "src/libexec/rtld-elf/rtld.c". Starting with that revision, multiple threads each doing lazy binding could interfere with each other. The usual symptom was that a symbol was falsely reported as undefined at start-up time. It was rare but not unseen. This commit fixes it.		1999-12-27 04:44:04 +00:00
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lockdflt.c	Add a new function dllockinit() for registering thread locking	1999-12-27 04:44:04 +00:00
Makefile.inc	Eliminate all machine-dependent code from the main source body and	1999-04-09 00:28:43 +00:00
reloc.c	Add a new function dllockinit() for registering thread locking	1999-12-27 04:44:04 +00:00
rtld_machdep.h	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00
rtld_start.S	$Id$ -> $FreeBSD$	1999-08-28 00:22:10 +00:00