added additional test case for async writer

tests/Makefile.am

@@ -16,6 +16,7 @@ TESTS = $(TESTRUNS) cfg.sh \
 	asynwr_large.sh \
 	asynwr_deadlock.sh \
 	asynwr_deadlock2.sh \
+	asynwr_deadlock4.sh \
 	gzipwr_large.sh \
 	gzipwr_large_dynfile.sh \
 	complex1.sh \
@@ -160,6 +161,8 @@ EXTRA_DIST= 1.rstest 2.rstest 3.rstest err1.rstest \
 	   testsuites/asynwr_deadlock.conf \
 	   asynwr_deadlock2.sh \
 	   testsuites/asynwr_deadlock2.conf \
+	   asynwr_deadlock4.sh \
+	   testsuites/asynwr_deadlock4.conf \
 	   gzipwr_large.sh \
 	   testsuites/gzipwr_large.conf \
 	   gzipwr_large_dynfile.sh \

tests/asynwr_deadlock4.sh

@@ -0,0 +1,25 @@
+# This is test case from practice, with the version we introduced it, it
+# caused a deadlock during processing.
+# We added this as a standard test in the hopes that iw will help
+# detect such things in the future.
+#
+# This is a test that is constructed similar to asynwr_deadlock2.sh, but
+# can produce problems in a simpler way.
+#
+# added 2010-03-18 by Rgerhards
+# This file is part of the rsyslog project, released  under GPLv3
+echo =================================================================================
+echo TEST: \[asynwr_deadlock4.sh\]: a case known to have caused a deadlock in the past
+source $srcdir/diag.sh init
+# uncomment for debugging support:
+export RSYSLOG_DEBUG="debug nostdout noprintmutexaction"
+export RSYSLOG_DEBUGLOG="log"
+source $srcdir/diag.sh startup asynwr_deadlock4.conf
+# send 20000 messages, each close to 2K (non-randomized!), so that we can fill
+# the buffers and hopefully run into the "deadlock".
+source $srcdir/diag.sh tcpflood -m20000 -d18 -P129 -i1 -f5
+# sleep is important! need to make sure the instance is inactive
+source $srcdir/diag.sh shutdown-when-empty # shut down rsyslogd when done processing messages
+source $srcdir/diag.sh wait-shutdown       # and wait for it to terminate
+source $srcdir/diag.sh seq-check 1 20000 -E
+source $srcdir/diag.sh exit

tests/testsuites/asynwr_deadlock4.conf

@@ -0,0 +1,15 @@
+# rgerhards, 2010-03-17
+$IncludeConfig diag-common.conf
+
+$ModLoad ../plugins/imtcp/.libs/imtcp
+$MainMsgQueueTimeoutShutdown 10000
+$InputTCPServerRun 13514
+
+$template outfmt,"%msg:F,58:3%,%msg:F,58:4%,%msg:F,58:5%\n"
+$template dynfile,"rsyslog.out.log" # use multiple dynafiles
+
+$OMFileFlushOnTXEnd on
+$OMFileFlushInterval 10
+$OMFileIOBufferSize 10k
+$DynaFileCacheSize 4
+local0.* ?dynfile;outfmt