no SQL inside the signal-handler (race-condition)

atom

@@ -1462,21 +1462,7 @@ destroyworker() {
 	wait $dyingworker
 }
 
-checkworkers() {
-	for key in ${!workers[@]}
-	do
-		if ! kill -0 ${workers[key]} 2>/dev/null
-		then
-			if read -u4 -t 0.01 alienquery
-			then
-				alienresults=(${alienquery%%|*})
-				rest="${alienquery#*|}|"
-				while [ -n "$rest" ]
-				do
-					alienresults+=("${rest%%|*}")
-					rest=${rest#*|}
-				done
-			fi
+gettaskinfos() {
 	echo '
 		SELECT
 			id,
@@ -1487,7 +1473,7 @@ checkworkers() {
 			filename
 		FROM	tasks
 		WHERE
-				id='${workertasks[key]}';
+		id='$1';
 	' >&3
 	read -u4 line
 	taskid=${line%%|*}
@@ -1502,10 +1488,34 @@ checkworkers() {
 	rest=${rest#*|}
 	destfilename=${rest%%|*}
 	rest=${rest#*|}
-			if destroyworker $key
+}
+
+cleaner() {
+	for taskid in ${failedtasks[@]}
+	do
+		gettaskinfos $taskid
+		faildepends=$(
+			Select tasks 'COUNT(*)' <<-EOWhere
+				requires = $taskid
+			EOWhere
+		)
+		(( failed+=faildepends ))
+		Update tasks status 2 <<<"id = $taskid"
+		Update tasks status 2 <<<"requires = $taskid"
+		echo "SELECT	COUNT(*)
+			FROM	tasks
+			WHERE	( status = 0 OR status = 1 )
+			AND	required = $taskid;">&3
+		read -u4 count
+		if (( count == 0 ))
 		then
-				(( ++ran ))
-				(( active-- )) || true
+			rm -f "$cleanup"
+		fi
+		unset failedtasks[taskid]
+	done
+	for taskid in ${finishedtasks[@]}
+	do
+		gettaskinfos $taskid
 		Delete tasks <<<"id = $taskid"
 		if [ -n "$destfilename" ]
 		then
@@ -1530,16 +1540,6 @@ checkworkers() {
 			"WHERE  id=$destfileid;"			\
 			>&3
 		fi
-			else
-				faildepends=$(
-					Select tasks 'COUNT(*)' <<-EOWhere
-						requires = $taskid
-					EOWhere
-				)
-				(( failed+=faildepends ))
-				Update tasks status 2 <<<"id = $taskid"
-				Update tasks status 2 <<<"requires = $taskid"
-			fi
 		echo "SELECT	COUNT(*)
 			FROM	tasks
 			WHERE	( status = 0 OR status = 1 )
@@ -1549,22 +1549,25 @@ checkworkers() {
 		then
 			rm -f "$cleanup"
 		fi
-			if (( ${#alienresults[@]} ))
-			then
-				alienquery='SELECT '
-				for key in ${!alienresults[@]}
-				do
-					(( key > 0 )) && alienquery+=,
-					expr='^[0-9]*$'
-					if [[ ${alienresults[key]} =~ $expr ]]
-					then
-						alienquery+=${alienresults[key]}
-					else
-						alienquery+="\"${alienresults[@]//\"/\"\"}\""
-					fi
+		unset finishedtasks[taskid]
 	done
-				echo "$alienquery;" >&3
-				unset alienquery alienresults
+}
+
+checkworkers() {
+	for key in ${!workers[@]}
+	do
+		if ! kill -0 ${workers[key]} 2>/dev/null
+		then
+			taskid=${workertasks[key]}
+			(( ++ran ))
+			(( active-- ))
+			if destroyworker $key
+			then
+				finishedtasks+=($taskid)
+			else
+				failedtasks+=($taskid)
+				(( ++ran ))
+				(( ++failed ))
 			fi
 		fi
 	done
@@ -2057,6 +2060,7 @@ do
 			(( ++concurrency ))
 		fi
 	fi
+	cleaner
 	master
 	if ((taskcount - remaining))
 	then