more ways to gently pause the experiment run

prsona/src/experimentQueueMain.cpp

@@ -20,6 +20,7 @@ const char *SHUT_DOWN = "scripts/bringDownTestServers.sh";
 const int INPUT_BUFFER_LEN = 133;
 char whichTest[INPUT_BUFFER_LEN];
 int currPid = 0;
+bool stopSignaled = false;
 
 void exitInterruptHandler(int signum)
 {
@@ -46,13 +47,22 @@ void exitInterruptHandler(int signum)
     exit(signum);
 }
 
+void gentleInterruptHandler(int signum)
+{
+    std::cout << "Upcoming stop signal received." << std::endl;
+    std::cout << "After the current run is done, the program will quit." << std::endl;
+
+    stopSignaled = true;
+}
+
 int main(int argc, char* argv[])
 {
     signal(SIGINT, exitInterruptHandler);
+    signal(SIGTSTP, gentleInterruptHandler);
 
     char inputBuffer[INPUT_BUFFER_LEN];
     std::ifstream configFile("cfg/queue.cfg");
-    while (!configFile.eof())
+    while (!stopSignaled && !configFile.eof())
     {
         configFile.getline(inputBuffer, INPUT_BUFFER_LEN);
         if (strlen(inputBuffer) > 0)