Squid-2.2.STABLE4: Async-IO sync fixes
    Async IO sync operation was somewhat incomplete. There could be some
    operations pending when the sync completed.
    Also, operations needs to be synced when switching user-id's, or it
    is uncertain which userid the operations get executed as.

Index: squid/src/aiops.c
diff -u squid/src/aiops.c:1.1.1.16.2.6 squid/src/aiops.c:1.1.1.16.2.7
--- squid/src/aiops.c:1.1.1.16.2.6	Tue Jul 27 19:34:37 1999
+++ squid/src/aiops.c	Sun Aug  1 17:13:05 1999
@@ -869,7 +869,7 @@
 {
     do {
 	aio_poll_threads();
-    } while(request_queue_len > 0);
+    } while(request_queue_len > 0 || busy_threads_head != NULL );
     return aio_operations_pending();
 }
 
Index: squid/src/tools.c
diff -u squid/src/tools.c:1.1.1.22.2.2 squid/src/tools.c:1.1.1.22.2.3
--- squid/src/tools.c:1.1.1.22.2.2	Tue Jul 27 20:47:49 1999
+++ squid/src/tools.c	Sun Aug  1 17:13:05 1999
@@ -503,6 +503,10 @@
 	return;
     if ((pwd = getpwnam(Config.effectiveUser)) == NULL)
 	return;
+#if USE_ASYNC_IO
+    /* Flush any pending operations before switching user id */
+    aioSync();
+#endif
     if (Config.effectiveGroup && (grp = getgrnam(Config.effectiveGroup))) {
 	if (setgid(grp->gr_gid) < 0)
 	    debug(50, 1) ("leave_suid: setgid: %s\n", xstrerror());
@@ -529,6 +533,10 @@
 enter_suid(void)
 {
     debug(21, 3) ("enter_suid: PID %d taking root priveleges\n", getpid());
+#if USE_ASYNC_IO
+    /* Flush any pending operations before switching user id */
+    aioSync();
+#endif
 #if HAVE_SETRESUID
     setresuid(-1, 0, -1);
 #else