manu bba80928a8 setcontext() used to be incompatible with -lpthread since it affected ... the TLS pointer, therefore wrecking the pthread environement. Some ports had _UC_TLSBASE flag or equivalent (_UC_UNIQUE on alpha) that controlled whether setcontext() would change the TLS pointer. This change let libpthread override setcontext() with its own version that unsets _UC_TLSBASE, enabling safe usage of setcontext() with -lpthread. We also have the following required changes here: - rename alpha's _UC_UNIQUE into _UC_TLSBASE - add _UC_TLSBASE definition in header file for all ports (powerpc, sh3, sparc and sparc64 lack the implementation for now) - introduce a libc stub that can be overriden for setcontext() - modify MD libcs swapcontext() implementations so that they use the setcontext() libc stub instead of doing a plain system call. While we are there: - document various MD _UC_* flags in header file - add libc and libpthread tests for swapcontext() behavior (hopefully helpful to spot MD problems introduced with this change) Future work: - Deciding whether kernel support or _UC_TLSBASE should be added for powerpc, sh3, sparc and sparc64 is left to portmasters sparc64 Approved by core@		2012-09-12 02:00:51 +00:00
..
_lwp.c	void cast	2012-03-21 00:34:04 +00:00
_setjmp.S	Save a few global registers during set/longjmp - at least the application	2011-04-30 23:41:12 +00:00
divrem.m4
fabs.S
fixunsdfsi.S
flt_rounds.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpgetmask.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpgetround.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpgetsticky.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpsetmask.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpsetround.c	c89 prototypes, unsigned int	2012-03-21 00:38:34 +00:00
fpsetsticky.c
longjmp.c	Save a few global registers during set/longjmp - at least the application	2011-04-30 23:41:12 +00:00
makecontext.c
Makefile.inc
modf.S
nanf.c
resumecontext.c	Mark _resumecontext as dead. ANSIfy all declarations for it.	2011-09-19 21:24:57 +00:00
setjmp.S	Save a few global registers during set/longjmp - at least the application	2011-04-30 23:41:12 +00:00
sigsetjmp.S
swapcontext.S	setcontext() used to be incompatible with -lpthread since it affected	2012-09-12 02:00:51 +00:00