various fixes for race conditions under threads: mutex locks based

on PL_threadnum were seriously flawed, since it means more than one
thread could enter the critical region; PL_na was global instead of
thread-local; child thread could finish and free thr structures
before Thread->new() got around to creating the Thread object;
cv_clone() needed locking, as it mucks with PL_comppad and other
global data; new_struct_thread() needed to lock template-thread's
mutex while copying its data

p4raw-id: //depot/perl@2385

1 files changed, 2 insertions, 0 deletions

diff --git a/thrdvar.h b/thrdvar.h
index 39405e105c..69f17fbc76 100644
--- a/thrdvar.h
+++ b/thrdvar.h
@@ -52,6 +52,8 @@ PERLVAR(Tretstack_max,	I32)
 
 PERLVAR(TSv,		SV *)		/* used to hold temporary values */
 PERLVAR(TXpv,		XPV *)		/* used to hold temporary values */
+PERLVAR(Tna,		STRLEN)		/* for use in SvPV when length is
+					   Not Applicable */
 
 /* stat stuff */
 PERLVAR(Tstatbuf,	Stat_t)