another threads reliability fix: serialize writes to thr->threadsv

avoid most uses of PL_na (which is much more inefficient than a
simple local); update docs to suit; PL_na now being thr->Tna may
be a minor compatibility issue for extensions--will require dTHR
outside of XSUBs (those get automatic dTHR)

p4raw-id: //depot/perl@2387

1 files changed, 1 insertions, 1 deletions

diff --git a/perly.c b/perly.c
index a13d388724..50494a3922 100644
--- a/perly.c
+++ b/perly.c
@@ -1771,7 +1771,7 @@ case 56:
 break;
 case 57:
 #line 302 "perly.y"
-{ char *name = SvPV(((SVOP*)yyvsp[0].opval)->op_sv, PL_na);
+{ STRLEN n_a; char *name = SvPV(((SVOP*)yyvsp[0].opval)->op_sv, n_a);
 			  if (strEQ(name, "BEGIN") || strEQ(name, "END")
 			      || strEQ(name, "INIT"))
 			      CvUNIQUE_on(PL_compcv);