add watchdog to case 7 (#5178)

Author: Jeffrey Mendelsohn

groups/bdl/bdlcc/bdlcc_fixedqueue.t.cpp

@@ -151,13 +151,52 @@ static int veryVeryVerbose;
 typedef void Element;
 typedef bdlcc::FixedQueue<Element*> Obj;
 
+const int k_DECISECOND = 100000;  // microseconds in 0.1 seconds
+
 // ============================================================================
 //                 HELPER CLASSES AND FUNCTIONS  FOR TESTING
 // ----------------------------------------------------------------------------
 
 namespace {
 namespace u {
 
+static bsls::AtomicInt s_continue;
+static char            s_watchdogText[128];
+
+/// Assign the specified `value` to be displayed if the watchdog expires.
+void setWatchdogText(const char *value)
+{
+    memcpy(s_watchdogText, value, strlen(value) + 1);
+}
+
+/// Watchdog function used to determine when a timeout should occur.  This
+/// function returns without expiration if `0 == s_continue` before one
+/// second elapses.  Upon expiration, `s_watchdogText` is displayed and the
+/// program is aborted.
+extern "C" void *watchdog(void *arg)
+{
+    if (arg) {
+        setWatchdogText(static_cast<const char *>(arg));
+    }
+
+    const int MAX = 300;  // one iteration is a deci-second
+
+    int count = 0;
+
+    while (s_continue) {
+        bslmt::ThreadUtil::microSleep(k_DECISECOND);
+        ++count;
+
+        ASSERTV(s_watchdogText, count < MAX);
+
+        if (MAX == count && s_continue) {
+            abort();
+        }
+    }
+
+    return 0;
+}
+
 /// Return the current time, as a `TimeInterval`.
 bsls::TimeInterval now()
 {
@@ -2348,6 +2387,12 @@ int main(int argc, char *argv[])
                           << "ABA \"empty\" value test" << endl
                           << "======================"   << endl;
 
+        bslmt::ThreadUtil::Handle watchdogHandle;
+
+        ::u::s_continue = 1;
+        ::u::setWatchdogText("ABA 'empty' test");
+        bslmt::ThreadUtil::create(&watchdogHandle, ::u::watchdog, 0);
+
         enum {
             k_NUM_PUSHER_THREADS = 40,
             k_NUM_VALUES = 6,
@@ -2398,8 +2443,12 @@ int main(int argc, char *argv[])
          }
          ASSERT(0 < ta.numAllocations());
          ASSERT(0 == ta.numBytesInUse());
-      } break;
 
+         ::u::s_continue = 0;
+
+         ::u::setWatchdogText("ABA 'empty' test: join watchdog");
+         bslmt::ThreadUtil::join(watchdogHandle);
+      } break;
       case 6: {
         // --------------------------------------------------------------------
         // CONCERN: REMOVE_ALL