diff -Naur apache_1.3.6+01-06/conf/httpd.conf-dist apache_1.3.6+01-07/conf/httpd.conf-dist
--- apache_1.3.6+01-06/conf/httpd.conf-dist	Wed Mar 10 01:14:27 1999
+++ apache_1.3.6+01-07/conf/httpd.conf-dist	Tue Jul 20 22:19:58 1999
@@ -179,6 +179,14 @@
 #BindAddress *
 
 #
+# SingleListen:  Require that each child process listen to a single IP
+# address and port, from the list specified using Listen options.
+# Listen addresses are distributed evenly across child processes.  This
+# avoids the whole serialized accept problem.
+#
+SingleListen off
+
+#
 # Dynamic Shared Object (DSO) Support
 #
 # To be able to use the functionality of a module which was built as a DSO you
diff -Naur apache_1.3.6+01-06/htdocs/manual/bind.html apache_1.3.6+01-07/htdocs/manual/bind.html
--- apache_1.3.6+01-06/htdocs/manual/bind.html	Mon Mar 22 16:17:33 1999
+++ apache_1.3.6+01-07/htdocs/manual/bind.html	Tue Jul 20 22:21:25 1999
@@ -72,7 +72,7 @@
 <A
  HREF="mod/directive-dict.html#Syntax"
  REL="Help"
-><STRONG>Syntax:</STRONG></A> Listen <EM>[ port | IP-address:port ]</EM><BR>
+><STRONG>Syntax:</STRONG></A> Listen <EM>[ port | IP-address:port ] [ CPU-num ]</EM><BR>
 <A
  HREF="mod/directive-dict.html#Default"
  REL="Help"
@@ -92,7 +92,14 @@
 used, with a port number only, the server listens to the given port on
 all interfaces, instead of the port given by the <TT>Port</TT>
 directive. If an IP address is given as well as a port, the server
-will listen on the given port and interface.  <P> Multiple Listen
+will listen on the given port and interface.  
+
+<P>The optional <TT>CPU-num</TT> argument specifies a CPU to which child
+processes listening to this address should be bound, when the <A
+HREF="mod/core.html#singlelisten"><TT>SingleListen</TT></A> option is
+on.
+
+<P>Multiple Listen
 directives may be used to specify a number of addresses and ports to
 listen to. The server will respond to requests from any of the listed
 addresses and ports.<P>
@@ -131,6 +138,7 @@
 <A HREF="vhosts/index.html">Virtual Hosts</A>,
 <A HREF="mod/core.html#bindaddress">BindAddress directive</A>,
 <A HREF="mod/core.html#port">Port directive</A>,
+<A HREF="mod/core.html#singlelisten">SingleListen directive</A>,
 <A HREF="dns-caveats.html">DNS Issues</A>
 and
 <A HREF="mod/core.html#virtualhost">&lt;VirtualHost&gt; section</A>.
diff -Naur apache_1.3.6+01-06/htdocs/manual/misc/perf-tuning.html apache_1.3.6+01-07/htdocs/manual/misc/perf-tuning.html
--- apache_1.3.6+01-06/htdocs/manual/misc/perf-tuning.html	Mon Mar 22 16:17:45 1999
+++ apache_1.3.6+01-07/htdocs/manual/misc/perf-tuning.html	Tue Jul 20 22:24:35 1999
@@ -238,7 +238,7 @@
 contains timing indications.  For highest performance, set
 <CODE>ExtendedStatus off</CODE> (which is the default).
 
-<H4>accept Serialization - multiple sockets</H4>
+<A NAME="acceptserialization"><H4>accept Serialization - multiple sockets</H4></A>
 
 <P>This discusses a shortcoming in the Unix socket API.
 Suppose your
diff -Naur apache_1.3.6+01-06/htdocs/manual/mod/core.html apache_1.3.6+01-07/htdocs/manual/mod/core.html
--- apache_1.3.6+01-06/htdocs/manual/mod/core.html	Thu Jul  8 12:05:03 1999
+++ apache_1.3.6+01-07/htdocs/manual/mod/core.html	Tue Jul 20 22:26:34 1999
@@ -92,6 +92,7 @@
 <LI><A HREF="#serversignature">ServerSignature</A>
 <LI><A HREF="#servertokens">ServerTokens</A>
 <LI><A HREF="#servertype">ServerType</A>
+<LI><A HREF="#singlelisten">SingleListen</A>
 <LI><A HREF="#startservers">StartServers</A>
 <LI><A HREF="#threadsperchild">ThreadsPerChild</A>
 <LI><A HREF="#timeout">TimeOut</A>
@@ -1575,7 +1576,7 @@
  HREF="directive-dict.html#Syntax"
  REL="Help"
 ><STRONG>Syntax:</STRONG></A>
-Listen [<EM>IP address</EM>:]<EM>port number</EM><BR>
+Listen [<EM>IP address</EM>:]<EM>port number [CPU-num]</EM><BR>
 <A
  HREF="directive-dict.html#Context"
  REL="Help"
@@ -1588,7 +1589,8 @@
  HREF="directive-dict.html#Compatibility"
  REL="Help"
 ><STRONG>Compatibility:</STRONG></A> Listen is only available in Apache
-1.1 and later.<P>
+1.1 and later.
+The optional CPU-num argument is only available in Apache 1.3.7 and later.<P>
 
 <P>The Listen directive instructs Apache to listen to more than one IP
 address or port; by default it responds to requests on all IP
@@ -1628,6 +1630,11 @@
    Listen 192.170.2.5:8000
 </PRE>
 
+<P>The optional CPU-num argument specifies the CPU to which Apache child
+processes listening exclusively to this address/port should be bound.
+See the <A HREF="#singlelisten"><TT>SingleListen</TT></A> directive for
+detailed information.
+
 <P><STRONG>See Also:</STRONG>
 <A HREF="../dns-caveats.html">DNS Issues</A><BR>
 <STRONG>See Also:</STRONG>
@@ -2958,6 +2965,75 @@
 it is far more efficient. The server is started once, and services all
 subsequent connections. If you intend running Apache to serve a busy site,
 standalone will probably be your only option.<P>
+
+<HR>
+<H2><A NAME="singlelisten">SingleListen directive</A></H2>
+<!--%plaintext &lt;?INDEX {\tt SingleListen} directive&gt; -->
+<A
+ HREF="directive-dict.html#Syntax"
+ REL="Help"
+><STRONG>Syntax:</STRONG></A> SingleListen <EM>on|off</EM><BR>
+<A
+ HREF="directive-dict.html#Default"
+ REL="Help"
+><STRONG>Default:</STRONG></A> <CODE>SingleListen off</CODE><BR>
+<A
+ HREF="directive-dict.html#Context"
+ REL="Help"
+><STRONG>Context:</STRONG></A> server config<BR>
+<A
+ HREF="directive-dict.html#Status"
+ REL="Help"
+><STRONG>Status:</STRONG></A> core<BR>
+<A
+ HREF="directive-dict.html#Compatibility"
+ REL="Help"
+><STRONG>Compatibility:</STRONG></A> SingleListen is only available in Apache
+1.3.7 and later.
+<P>
+This directive controls the set of IP addresses (and ports) to which
+child processes listen.  When SingleListen is on, each child process
+listens to a single IP address and port from the list specified using
+Listen directives.  Listen addresses are distributed evenly across child
+processes.  This is a high-performance, but not necessarily
+general-purpose, way to solve the thorny <A
+HREF="../misc/perf-tuning.html#acceptserialization">accept-serialization
+problem</A> found with multiple Listen addresses.  When off, the
+default, each child process listens to all Listen addresses
+simultaneously.
+<P>
+This directive also enables another performance optimization for systems
+with multiple CPUs and multiple network interfaces.  When the device
+interrupts from each network interface are bound to particular CPUs and
+the Apache child processes listening for requests from those interfaces
+are bound to the same CPUs, performance is increased due to
+cache-warming.  (Listen directives specify IP-address/CPU-number pairs.)
+This optimization is particularly helpful on cache-coherent non-uniform
+memory access (ccNUMA) systems such as SGI's Origin series because it
+also increases memory reference locality.  CPU binding is disabled if
+SingleListen is off.
+<P>
+Here is an example of this:
+<PRE>Listen 111.22.33.44 0
+Listen 111.22.33.45 1
+Listen 111.22.33.46 2
+Listen 111.22.33.47 3
+SingleListen on
+</PRE>
+Apache child processes listening to requests from 111.22.33.44 are bound
+to CPU 0, child processes listening to 111.22.33.45 are bound to CPU 1,
+and so on.  When this configuration is used on a four-CPU system where
+interrupts from the network controller for 111.22.33.44 are bound to CPU
+0, interrupts from 111.22.33.45 are bound to CPU 1, and so on,
+performance is increased over a system lacking such binding.  Note that
+binding child processes to CPUs other than those to which the network
+interrupts are bound may result in worse performance.
+<P>
+See also the <A HREF="#listen">Listen</A> directive,
+the <A HREF="mod_status.html">status</A> module, and
+the <A HREF="../misc/perf-tuning.html">performance tuning guide</A>.
+<P>
+
 <HR>
 <H2><A NAME="startservers">StartServers directive</A></H2>
 <!--%plaintext &lt;?INDEX {\tt StartServers} directive&gt; -->
diff -Naur apache_1.3.6+01-06/htdocs/manual/mod/directives.html apache_1.3.6+01-07/htdocs/manual/mod/directives.html
--- apache_1.3.6+01-06/htdocs/manual/mod/directives.html	Mon Mar 22 16:17:36 1999
+++ apache_1.3.6+01-07/htdocs/manual/mod/directives.html	Tue Jul 20 22:27:13 1999
@@ -210,6 +210,7 @@
 <LI><A HREF="mod_setenvif.html#setenvif">SetEnvIf</A>
 <LI><A HREF="mod_setenvif.html#SetEnvIfNoCase">SetEnvIfNoCase</A>
 <LI><A HREF="mod_mime.html#sethandler">SetHandler</A>
+<LI><A HREF="core.html#singlelisten">SingleListen</A>
 <LI><A HREF="core.html#startservers">StartServers</A>
 <LI><A HREF="core.html#threadsperchild">ThreadsPerChild</A>
 <LI><A HREF="core.html#timeout">TimeOut</A>
diff -Naur apache_1.3.6+01-06/src/include/ap_config.h apache_1.3.6+01-07/src/include/ap_config.h
--- apache_1.3.6+01-06/src/include/ap_config.h	Mon Jul 19 16:21:55 1999
+++ apache_1.3.6+01-07/src/include/ap_config.h	Tue Jul 20 22:58:29 1999
@@ -203,6 +203,7 @@
     !defined(USE_SYSVSEM_SERIALIZED_ACCEPT)
 #define USE_FCNTL_SERIALIZED_ACCEPT
 #endif
+#define SINGLE_LISTEN_UNSERIALIZED_ACCEPT
 #define HAVE_SHMGET 1
 #define USE_SHMGET_SCOREBOARD
 #define HAVE_MMAP 1
diff -Naur apache_1.3.6+01-06/src/include/http_conf_globals.h apache_1.3.6+01-07/src/include/http_conf_globals.h
--- apache_1.3.6+01-06/src/include/http_conf_globals.h	Fri Jan  1 11:04:39 1999
+++ apache_1.3.6+01-07/src/include/http_conf_globals.h	Tue Jul 20 22:30:01 1999
@@ -87,6 +87,10 @@
 extern int ap_dump_settings;
 extern API_VAR_EXPORT int ap_extended_status;
 
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+extern int ap_single_listen;
+#endif
+
 extern char *ap_pid_fname;
 extern char *ap_scoreboard_fname;
 extern char *ap_lock_fname;
diff -Naur apache_1.3.6+01-06/src/include/httpd.h apache_1.3.6+01-07/src/include/httpd.h
--- apache_1.3.6+01-06/src/include/httpd.h	Tue Jul 20 17:14:58 1999
+++ apache_1.3.6+01-07/src/include/httpd.h	Tue Jul 20 22:31:15 1999
@@ -918,6 +918,9 @@
     int fd;
     int used;			/* Only used during restart */
     int unique;			/* is local_addr unique (not wild)? */
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    int cpu;			/* if ap_single_listen, cpu to bind to */
+#endif
 /* more stuff here, like which protocol is bound to the port */
 };
 
diff -Naur apache_1.3.6+01-06/src/include/scoreboard.h apache_1.3.6+01-07/src/include/scoreboard.h
--- apache_1.3.6+01-06/src/include/scoreboard.h	Mon Jul 19 16:22:58 1999
+++ apache_1.3.6+01-07/src/include/scoreboard.h	Tue Jul 20 22:32:03 1999
@@ -159,6 +159,10 @@
     char request[64];		/* We just want an idea... */
     server_rec *vhostrec;	/* What virtual host is being accessed? */
                                 /* SEE ABOVE FOR SAFE USAGE! */
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    int  cpu;			/* cpu to which it is bound */
+    struct sockaddr_in single_addr;	/* if ap_single_listen, listen addr */
+#endif
 } short_score;
 
 typedef struct {
diff -Naur apache_1.3.6+01-06/src/main/http_config.c apache_1.3.6+01-07/src/main/http_config.c
--- apache_1.3.6+01-06/src/main/http_config.c	Tue Jul 20 21:53:50 1999
+++ apache_1.3.6+01-07/src/main/http_config.c	Tue Jul 20 22:33:40 1999
@@ -1399,6 +1399,9 @@
     ap_listeners = NULL;
     ap_listenbacklog = DEFAULT_LISTENBACKLOG;
     ap_extended_status = 0;
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    ap_single_listen = 0;
+#endif
 
     /* Global virtual host hash bucket pointers.  Init to null. */
     ap_init_vhost_config(p);
@@ -1455,6 +1458,9 @@
     new->fd = -1;
     new->used = 0;
     new->unique = new->local_addr.sin_addr.s_addr != htonl(INADDR_ANY);
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    new->cpu = -1;
+#endif
     new->next = NULL;
     ap_listeners = new;
 }
diff -Naur apache_1.3.6+01-06/src/main/http_core.c apache_1.3.6+01-07/src/main/http_core.c
--- apache_1.3.6+01-06/src/main/http_core.c	Tue Jul 20 21:53:50 1999
+++ apache_1.3.6+01-07/src/main/http_core.c	Tue Jul 20 23:29:49 1999
@@ -2382,11 +2382,13 @@
 }
 
 /*ARGSUSED1*/
-static const char *set_listener(cmd_parms *cmd, void *dummy, char *ips)
+static const char *set_listener(cmd_parms *cmd, void *dummy, char *ips,
+    char *cpustr)
 {
     listen_rec *new;
     char *ports;
     unsigned short port;
+    int cpu;
 
     const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
     if (err != NULL) {
@@ -2407,6 +2409,14 @@
 	ports = ips;
     }
 
+    cpu = -1;
+    if (cpustr) {
+	if (ap_isdigit(*cpustr))
+	    cpu = atoi(cpustr);
+	if (cpu < 0)
+	    return "Optional CPU id must be positive number";
+    }
+
     new=ap_pcalloc(cmd->pool, sizeof(listen_rec));
     new->local_addr.sin_family = AF_INET;
     if (ports == ips) { /* no address */
@@ -2423,6 +2433,9 @@
     new->fd = -1;
     new->used = 0;
     new->unique = new->local_addr.sin_addr.s_addr != htonl(INADDR_ANY);
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    new->cpu = cpu;
+#endif
     new->next = ap_listeners;
     ap_listeners = new;
     return NULL;
@@ -2685,6 +2698,41 @@
     return NULL;
 }
 
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+static int
+set_binary(const char *how, int *var)
+{
+    int ok;
+
+    if (!strcasecmp(how, "on") || !strcasecmp(how, "yes") ||
+	!strcasecmp(how, "true") || !strncasecmp(how, "enable", 6)) {
+	*var = 1;
+	ok = 1;
+    } else if (!strcasecmp(how, "off") || !strcasecmp(how, "no") ||
+	!strcasecmp(how, "false") || !strncasecmp(how, "disable", 7)) {
+	*var = 0;
+	ok = 1;
+    } else
+	ok = 0;
+
+    return ok;
+}
+#endif
+
+/*ARGSUSED1*/
+static const char *set_single_listen(cmd_parms *cmd, void *dummy, char *arg) 
+{
+    const char *err;
+
+    err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    if (err == NULL && !set_binary(arg, &ap_single_listen))
+	err = "Unknown SingleListen state; try \"on\" or \"off\"";
+#endif
+	
+    return err;
+}
+
 #ifdef WIN32
 static const char *set_interpreter_source(cmd_parms *cmd, core_dir_config *d,
                                                 char *arg)
@@ -2882,8 +2930,8 @@
    OR_ALL, TAKE12, "soft/hard limits for max number of processes per uid" },
 { "BindAddress", set_bind_address, NULL, RSRC_CONF, TAKE1,
   "'*', a numeric IP address, or the name of a host with a unique IP address"},
-{ "Listen", set_listener, NULL, RSRC_CONF, TAKE1,
-  "A port number or a numeric IP address and a port number"},
+{ "Listen", set_listener, NULL, RSRC_CONF, TAKE12,
+  "A port number or a numeric IP address and a port number, and an optional CPU id"},
 { "SendBufferSize", set_send_buffer_size, NULL, RSRC_CONF, TAKE1,
   "Send buffer size in bytes"},
 { "AddModule", add_module_command, NULL, RSRC_CONF, ITERATE,
@@ -2925,6 +2973,13 @@
   (void*)XtOffsetOf(core_dir_config, limit_req_body),
   OR_ALL, TAKE1,
   "Limit (in bytes) on maximum size of request message body" },
+{ "SingleListen", set_single_listen, NULL, RSRC_CONF, TAKE1,
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+  "Force each child to serve a single Listen address"
+#else
+  "Ignored because !SINGLE_LISTEN_UNSERIALIZED_ACCEPT"
+#endif
+},
 { NULL }
 };
 
diff -Naur apache_1.3.6+01-06/src/main/http_main.c apache_1.3.6+01-07/src/main/http_main.c
--- apache_1.3.6+01-06/src/main/http_main.c	Tue Jul 20 17:17:27 1999
+++ apache_1.3.6+01-07/src/main/http_main.c	Tue Jul 20 22:40:59 1999
@@ -249,6 +249,9 @@
 int ap_listenbacklog;
 int ap_dump_settings = 0;
 API_VAR_EXPORT int ap_extended_status = 0;
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+int ap_single_listen;
+#endif
 
 /*
  * The max child slot ever assigned, preserved across restarts.  Necessary
@@ -965,7 +968,7 @@
  * when it's safe in the single Listen case.
  */
 #ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
-#define SAFE_ACCEPT(stmt) {if(ap_listeners->next != ap_listeners) {stmt;}}
+#define SAFE_ACCEPT(stmt) {if(!ap_single_listen && ap_listeners->next != ap_listeners) {stmt;}}
 #else
 #define SAFE_ACCEPT(stmt) {stmt;}
 #endif
@@ -3376,7 +3379,11 @@
     /* warn them about the starvation problem if they're using multiple
      * sockets
      */
-    if (ap_listeners->next != ap_listeners) {
+    if (
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+	!ap_single_listen &&
+#endif
+	ap_listeners->next != ap_listeners) {
 	ap_log_error(APLOG_MARK, APLOG_NOERRNO|APLOG_CRIT, NULL,
 		    "You cannot use multiple Listens safely on your system, "
 		    "proceeding anyway.  See src/PORTING, search for "
@@ -3695,6 +3702,19 @@
     }
 #endif
 
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    ap_sync_scoreboard_image();
+    ap_scoreboard_image->servers[my_child_num].cpu = -1;
+    if (ap_single_listen) {
+	if (head_listener->cpu >= 0 && ap_os_bind_cpu(head_listener->cpu))
+	    ap_scoreboard_image->servers[my_child_num].cpu =
+		head_listener->cpu;
+	ap_scoreboard_image->servers[my_child_num].single_addr =
+	    head_listener->local_addr;
+    }
+    put_scoreboard_info(my_child_num, &ap_scoreboard_image->servers[my_child_num]);
+#endif
+
     ap_child_init_modules(pchild, server_conf);
 
     /* done with the initialization critical section */
@@ -3767,7 +3787,11 @@
 	SAFE_ACCEPT(accept_mutex_on());
 
 	for (;;) {
-	    if (ap_listeners->next != ap_listeners) {
+	    if (
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+		!ap_single_listen &&
+#endif
+		ap_listeners->next != ap_listeners) {
 		/* more than one socket */
 		memcpy(&main_fds, &listenfds, sizeof(fd_set));
 		srv = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, NULL);
@@ -4072,6 +4096,9 @@
 	signal(SIGINT, just_die);
 	signal(SIGQUIT, SIG_DFL);
 	signal(SIGTERM, just_die);
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+	ap_single_listen = 0;
+#endif
 	child_main(slot);
     }
 
diff -Naur apache_1.3.6+01-06/src/modules/standard/mod_status.c apache_1.3.6+01-07/src/modules/standard/mod_status.c
--- apache_1.3.6+01-06/src/modules/standard/mod_status.c	Thu Jul  8 12:51:33 1999
+++ apache_1.3.6+01-07/src/modules/standard/mod_status.c	Tue Jul 20 22:44:40 1999
@@ -254,6 +254,10 @@
     parent_score ps_record;
     char stat_buffer[HARD_SERVER_LIMIT];
     int pid_buffer[HARD_SERVER_LIMIT];
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+    int cpu_buffer[HARD_SERVER_LIMIT];
+    struct sockaddr_in addr_buffer[HARD_SERVER_LIMIT];
+#endif
     clock_t tu, ts, tcu, tcs;
     server_rec *vhost;
 
@@ -313,6 +317,11 @@
 	res = score_record.status;
 	stat_buffer[i] = status_flags[res];
 	pid_buffer[i] = (int) ps_record.pid;
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+	cpu_buffer[i] = score_record.cpu;
+	if (ap_single_listen)
+	    addr_buffer[i] = score_record.single_addr;
+#endif
 	if (res == SERVER_READY)
 	    ready++;
 	else if (res != SERVER_DEAD)
@@ -461,6 +470,26 @@
 	    ap_rputs("<PRE>\n", r);
 	    for (i = 0; i < HARD_SERVER_LIMIT; ++i) {
 		if (stat_buffer[i] != '.') {
+#ifdef SINGLE_LISTEN_UNSERIALIZED_ACCEPT
+		    char slbuf[32];
+
+		    if (cpu_buffer[i] >= 0)
+			ap_snprintf(slbuf, sizeof slbuf, "cpu %d", cpu_buffer[i]);
+		    else
+			strcpy(slbuf, "any cpu");
+		    ap_rprintf(r, "   %d in state: %c on %s", pid_buffer[i],
+		     stat_buffer[i], slbuf);
+		    if (ap_single_listen)
+			ap_rprintf(r, " listening to %s:%hu\n",
+			    (addr_buffer[i].sin_addr.s_addr == htonl(INADDR_ANY)) ?
+			    "*" : ap_inet_ntoa(addr_buffer[i].sin_addr, slbuf, NULL),
+			    ntohs(addr_buffer[i].sin_port));
+		    else if (++j >= 2) {
+		    	ap_rputs("\n", r);
+			j = 0;
+		    } else
+		    	ap_rputs(",", r);
+#else
 		    ap_rprintf(r, "   %d in state: %c ", pid_buffer[i],
 		     stat_buffer[i]);
 		    if (++j >= 3) {
@@ -468,6 +497,7 @@
 			j = 0;
 		    } else
 		    	ap_rputs(",", r);
+#endif
 		}
 	    }
 	    ap_rputs("\n", r);
diff -Naur apache_1.3.6+01-06/src/os/unix/os.c apache_1.3.6+01-07/src/os/unix/os.c
--- apache_1.3.6+01-06/src/os/unix/os.c	Tue Sep 15 23:49:44 1998
+++ apache_1.3.6+01-07/src/os/unix/os.c	Tue Jul 20 22:45:13 1999
@@ -6,6 +6,11 @@
 #include "ap_config.h"
 #include "os.h"
 
+#if defined(IRIX) && IRIX >= 50
+#include "httpd.h"
+#include "http_log.h"
+#include <sys/sysmp.h>
+#endif
 
 /* some linkers complain unless there's at least one function in each
  * .o file... and extra prototype is for gcc -Wmissing-prototypes
@@ -168,4 +173,25 @@
 #else
     return dlerror();
 #endif
+}
+
+/*
+ * Bind the current process to the given CPU.  Return nonzero if
+ * successful.
+ */
+int
+ap_os_bind_cpu(int cpu)
+{
+    int bound = 0;
+
+#if defined(IRIX) && IRIX >= 50
+    /* only Irix 5.0 and beyond have sysmp(MP_MUSTRUN) */
+    if (sysmp(MP_MUSTRUN, cpu) != -1)
+	bound = 1;
+    else
+	ap_log_error(APLOG_MARK, APLOG_WARNING, NULL,
+	    "cannot bind process %d to cpu %d", getpid(), cpu);
+#endif
+
+    return bound;
 }
diff -Naur apache_1.3.6+01-06/src/os/unix/os.h apache_1.3.6+01-07/src/os/unix/os.h
--- apache_1.3.6+01-06/src/os/unix/os.h	Thu Jul  8 12:53:52 1999
+++ apache_1.3.6+01-07/src/os/unix/os.h	Tue Jul 20 22:45:33 1999
@@ -140,4 +140,6 @@
 void *      ap_os_dso_sym(void *, const char *);
 const char *ap_os_dso_error(void);
 
+int	    ap_os_bind_cpu(int);
+
 #endif	/* !APACHE_OS_H */
diff -Naur apache_1.3.6+01-06/src/os/win32/os.h apache_1.3.6+01-07/src/os/win32/os.h
--- apache_1.3.6+01-06/src/os/win32/os.h	Sun Mar  7 05:13:56 1999
+++ apache_1.3.6+01-07/src/os/win32/os.h	Tue Jul 20 22:45:58 1999
@@ -120,4 +120,6 @@
 #define ap_os_dso_sym(h,s)  GetProcAddress(h,s)
 #define ap_os_dso_error()   ""	/* for now */
 
+#define	ap_os_bind_cpu(c)   (0)
+
 #endif   /* ! APACHE_OS_H */