fix: use required_by, check child task status

lib/workers/master

@@ -8,7 +8,112 @@ master() {
 			SELECT	COUNT(*)
 			FROM	tasks
 			WHERE	status = 0;
+		'>&3
 
+		read -u4 remaining
+		if (( remaining == 0 ))
+		then
+			sleep 0.1
+			return 0
+		fi
+
+		echo '
+			SELECT	COUNT(*)
+			FROM	tasks
+			WHERE	status = 0
+			AND	requires IN (
+					SELECT	id
+					FROM	tasks
+					WHERE	status = 4
+				);
+
+			SELECT
+				id,
+				source_file,
+				cmd_arg0,
+				cmd_arg1,
+				cmd_arg2,
+				cmd_arg3,
+				cmd_arg4,
+				cmd_arg5,
+				cmd_arg6,
+				cmd_arg7,
+				cmd_arg8,
+				cmd_arg9,
+				cmd_arg10,
+				cmd_arg11,
+				cmd_arg12,
+				cmd_arg13,
+				cmd_arg14,
+				cmd_arg15,
+				cmd_arg16,
+				cmd_arg17,
+				cmd_arg18,
+				cmd_arg19,
+				cmd_arg20,
+				cmd_arg21,
+				cmd_arg22,
+				cmd_arg23,
+				cmd_arg24,
+				cmd_arg25,
+				cmd_arg26,
+				cmd_arg27,
+				cmd_arg28,
+				cmd_arg29,
+				cmd_arg30,
+				cmd_arg31,
+				cmd_arg32,
+				cmd_arg33,
+				cmd_arg34,
+				cmd_arg35,
+				cmd_arg36,
+				cmd_arg37,
+				cmd_arg38,
+				cmd_arg39,
+				cmd_arg40,
+				cmd_arg41,
+				cmd_arg42,
+				cmd_arg43,
+				cmd_arg44,
+				cmd_arg45,
+				cmd_arg46,
+				cmd_arg47,
+				cmd_arg48,
+				cmd_arg49,
+				cmd_arg50,
+				cmd_arg51,
+				cmd_arg52,
+				cmd_arg53,
+				cmd_arg54,
+				cmd_arg55,
+				cmd_arg56,
+				cmd_arg57,
+				cmd_arg58,
+				cmd_arg59,
+				cleanup,
+				fileid,
+				filename
+			FROM	tasks
+			WHERE	status = 0
+			AND	requires IN (
+					SELECT	id
+					FROM	tasks
+					WHERE	status = 4
+					ORDER BY source_file
+					/* LIMIT 1 */
+				)
+			ORDER BY source_file
+			LIMIT 1;
+		'>&3
+
+		read -u4 ready
+		if (( ready > 0 ))
+		then
+			createworker
+			return 0
+		fi
+
+		echo '
 			SELECT	COUNT(*)
 			FROM	tasks
 			WHERE	status = 0
@@ -86,15 +191,12 @@ master() {
 			ORDER BY source_file
 			LIMIT 1;
 		' >&3
-		read -u4 remaining
+
 		read -u4 ready
-		if (( remaining == 0 ))
+
+		if (( active == 0 && ready == 0 ))
 		then
-			sleep 0.1
+			dumpfile="$tempdir/tasks-$(date -Iseconds).csv"
-			return 0
-		elif (( active == 0 && ready == 0 ))
-		then
-			dumpfile="$tmpdir/tasks-$(date -Iseconds).csv"
 			cat <<-EOF