From: Ilya Zakharevich <ilya@math.berkeley.edu>
Date: Mon, 18 Dec 2006 00:55:19 +0000 (-0800)
Subject: OS/2: survive SIGCHLD
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=2563cec55ae473562ff3ccda41cd10289db419be;p=p5sagit%2Fp5-mst-13.2.git

OS/2: survive SIGCHLD
Message-ID: <20061218085519.GA14893@powdermilk.math.berkeley.edu>

plus a perldiag entry for the new error,
"Maximal count of pending signals (%s) exceeded"

p4raw-id: //depot/perl@29577
---

diff --git a/mg.c b/mg.c
index b0af1c8..d658bbc 100644
--- a/mg.c
+++ b/mg.c
@@ -1290,6 +1290,10 @@ Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
     return 0;
 }
 
+#ifndef SIG_PENDING_DIE_COUNT
+#  define SIG_PENDING_DIE_COUNT 120
+#endif
+
 static void
 S_raise_signal(pTHX_ int sig)
 {
@@ -1297,7 +1301,9 @@ S_raise_signal(pTHX_ int sig)
     /* Set a flag to say this signal is pending */
     PL_psig_pend[sig]++;
     /* And one to say _a_ signal is pending */
-    PL_sig_pending = 1;
+    if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
+	Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
+		(unsigned long)SIG_PENDING_DIE_COUNT);
 }
 
 Signal_t
diff --git a/pod/perldiag.pod b/pod/perldiag.pod
index c8c90ef..af7c9c4 100644
--- a/pod/perldiag.pod
+++ b/pod/perldiag.pod
@@ -2285,6 +2285,14 @@ rules and perl was unable to guess how to make more progress.
 (F) You tried to unpack something that didn't comply with UTF-8 encoding
 rules and perl was unable to guess how to make more progress.
 
+=item Maximal count of pending signals (%s) exceeded
+
+(F) Perl aborted due to a too important number of signals pending. This
+usually indicates that your operating system tried to deliver signals
+too fast (with a very high priority), starving the perl process from
+resources it would need to reach a point where it can process signals
+safely. (See L<perlipc/"Deferred Signals (Safe Signals)">.)
+
 =item %s matches null string many times in regex; marked by <-- HERE in m/%s/
 
 (W regexp) The pattern you've specified would be an infinite loop if the