From: Malcolm Beattie <mbeattie@sable.ox.ac.uk>
Date: Tue, 9 Sep 1997 16:57:41 +0000 (+0000)
Subject: Update README.threads to mention -DL.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=1304aa9d125296870a384c81cea5102c45d467c8;p=p5sagit%2Fp5-mst-13.2.git

Update README.threads to mention -DL.

p4raw-id: //depot/perl@60
---

diff --git a/README.threads b/README.threads
index 9e7b4d4..12abbe5 100644
--- a/README.threads
+++ b/README.threads
@@ -105,6 +105,18 @@ haven't tracked down yet) and there are very probably others too.
 * Plenty of others
 
 
+Debugging
+
+Use the -DL command-line option to turn on debugging of the
+multi-threading code. Under Linux, that also turns on a quick
+hack I did to grab a bit of extra information from segfaults.
+If you have a fancier gdb/threads setup than I do then you'll
+have to delete the lines in perl.c which say
+    #if defined(DEBUGGING) && defined(USE_THREADS) && defined(__linux__)
+        DEBUG_L(signal(SIGSEGV, (void(*)(int))catch_sigsegv););
+    #endif
+
+
 Background
 
 Some old globals (e.g. stack_sp, op) and some old per-interpreter