Fix parallel execution of termination runs

Author: peterschrammel

2ls.inc

@@ -1,41 +1,65 @@
-# tool 
+# tool
 
 TOOL_BINARY=./2ls-binary
 TOOL_NAME=2LS
 
 # function to run the tool
 
-run() 
+run()
 {
   # add property-specific options
   if [[ "$PROP" == "termination" ]]; then
-    PROPERTY="$PROPERTY --termination --competition-mode"
+    PROPERTY1="$PROPERTY --termination --competition-mode"
     PROPERTY2="$PROPERTY --nontermination --competition-mode"
-    
+
     # run the termination and nontermination analysis in parallel
-    $TOOL_BINARY --graphml-witness $LOG.witness $BIT_WIDTH $PROPERTY \
-      --function $ENTRY $BM >> $LOG.ok 2>&1 &
+    $TOOL_BINARY --graphml-witness $LOG.witness $BIT_WIDTH $PROPERTY1 \
+      --function $ENTRY $BM >> $LOG.ok1 2>&1 &
+    PID1="$!"
     $TOOL_BINARY --graphml-witness $LOG.witness $BIT_WIDTH $PROPERTY2 \
-      --function $ENTRY $BM >> $LOG.ok 2>&1 &
-    wait -n
-    
+      --function $ENTRY $BM >> $LOG.ok2 2>&1 &
+    PID2="$!"
+    # this might not work in all environments
+    wait -n &> /dev/null
+
     # store the exit code of the first process that is finished
     EC=$?
-    
-    # if the result of termination analysis is unknown,
-    # wait for the most recently executed background process,
-    # which is nontermination analysis
-    if [$EC -eq 5]; then
-      wait $!
+
+    # find out which one has finished
+    for pid in $PID1 $PID2
+    do
+      if ! ps -p $pid &> /dev/null; then
+        EXITED=$pid
+        break
+      fi
+    done
+
+    # if the result of the first exiting analysis is inconclusive
+    # then wait for the other analysis to finish
+    if [ $EC -eq 5 ]; then
+      wait -n &> /dev/null
       EC=$?
+      if [[ "$EXITED" == "$PID1" ]]; then
+        mv $LOG.ok2 $LOG.ok
+      else
+        mv $LOG.ok1 $LOG.ok
+      fi
+    else # we have a conclusive result, kill the other process
+      if [[ "$EXITED" == "$PID1" ]]; then
+        kill -9 $PID2 &> /dev/null
+        mv $LOG.ok1 $LOG.ok
+      else
+        kill -9 $PID1  &> /dev/null
+        mv $LOG.ok2 $LOG.ok
+      fi
     fi
   else
     PROPERTY="$PROPERTY --k-induction --competition-mode"
-    
+
     # run the tool
     $TOOL_BINARY --graphml-witness $LOG.witness $BIT_WIDTH $PROPERTY \
       --function $ENTRY $BM >> $LOG.ok 2>&1
-    
+
     # store the exit code
     EC=$?
   fi