First phase of memory management rewrite (see backend/utils/mmgr/README

for details).  It doesn't really do that much yet, since there are no
short-term memory contexts in the executor, but the infrastructure is
in place and long-term contexts are handled reasonably.  A few long-
standing bugs have been fixed, such as 'VACUUM; anything' in a single
query string crashing.  Also, out-of-memory is now considered a
recoverable ERROR, not FATAL.
Eliminate a large amount of crufty, now-dead code in and around
memory management.
Fix problem with holding off SIGTRAP, SIGSEGV, etc in postmaster and
backend startup.

1 files changed, 39 insertions, 1 deletions

diff --git a/src/backend/libpq/pqsignal.c b/src/backend/libpq/pqsignal.c
index 04ebd7dd57..4648fe455f 100644
--- a/src/backend/libpq/pqsignal.c
+++ b/src/backend/libpq/pqsignal.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/libpq/pqsignal.c,v 1.15 2000/06/11 11:39:50 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/libpq/pqsignal.c,v 1.16 2000/06/28 03:31:41 tgl Exp $
  *
  * NOTES
  *		This shouldn't be in libpq, but the monitor and some other
@@ -44,6 +44,44 @@
 
 #include "libpq/pqsignal.h"
 
+
+/*
+ * Initialize BlockSig and UnBlockSig.
+ *
+ * BlockSig is the set of signals to block when we are trying to block
+ * signals.  This includes all signals we normally expect to get, but NOT
+ * signals that should never be turned off.
+ *
+ * UnBlockSig is the set of signals to block when we don't want to block
+ * signals (is this ever nonzero??)
+ */
+void
+pqinitmask(void)
+{
+#ifdef HAVE_SIGPROCMASK
+	sigemptyset(&UnBlockSig);
+	sigfillset(&BlockSig);
+	sigdelset(&BlockSig, SIGABRT);
+	sigdelset(&BlockSig, SIGILL);
+	sigdelset(&BlockSig, SIGSEGV);
+	sigdelset(&BlockSig, SIGBUS);
+	sigdelset(&BlockSig, SIGTRAP);
+	sigdelset(&BlockSig, SIGCONT);
+	sigdelset(&BlockSig, SIGSYS);
+#else
+	UnBlockSig = 0;
+	BlockSig = sigmask(SIGHUP) | sigmask(SIGQUIT) |
+		sigmask(SIGTERM) | sigmask(SIGALRM) |
+		sigmask(SIGINT) | sigmask(SIGUSR1) |
+		sigmask(SIGUSR2) | sigmask(SIGCHLD) |
+		sigmask(SIGWINCH) | sigmask(SIGFPE);
+#endif
+}
+
+
+/*
+ * Set up a signal handler
+ */
 pqsigfunc
 pqsignal(int signo, pqsigfunc func)
 {