Undo all the work on determinism in the driver. New plan soon.

luprex/core/cpp/drivertests.cpp

@@ -19,6 +19,13 @@ static void dump_lines(StreamBuffer *in, StreamBuffer *out, int chid) {
     }
 }
 
+// This test is the minimal possible DrivenEngine.
+class DriverStubTest : public DrivenEngine {
+    virtual void event_init(int argc, char *argv[]) {
+        stop_driver();
+    }
+};
+
 // This test connects to a public webserver and prints
 // the output from the server.
 class DriverWebServerTest : public DrivenEngine {
@@ -72,15 +79,6 @@ public:
     }
 };
 
-static int64_t mallocstate() {
-    int64_t result = 0;
-    for (int i = 0; i < 10; i++) {
-        int64_t n = int64_t(malloc(1));
-        result = (result * 17) + n;
-    }
-    return result;
-}
-
 // This test just prints the time.
 class DriverPrintClockTest : public DrivenEngine {
 public:
@@ -94,7 +92,7 @@ public:
     virtual void event_update() {
         double clock = get_clock();
         if (clock > last_clock_ + 0.5) {
-            int64_t ms = mallocstate();
+            int ms = util::hash_of_mallocs();
             stdostream() << std::fixed << std::setprecision(2) << clock << "   " << std::hex << ms << "  ";
             count_++;
             last_clock_ = clock;
@@ -120,6 +118,9 @@ private:
     }
 };
 
+UniqueDrivenEngine make_DriverStubTest() {
+    return UniqueDrivenEngine(new DriverStubTest);
+}
 
 UniqueDrivenEngine make_DriverWebServerTest() {
     return UniqueDrivenEngine(new DriverWebServerTest);