added a command to calculate the current average wait time

diff --git a/src/dev.cc b/src/dev.cc
index 463be30..44a263a 100644 (file)
--- a/src/dev.cc
+++ b/src/dev.cc
@@ -20,7 +20,9 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include <string.h>
 #include <errno.h>
 #include <signal.h>
+#include <time.h>
 #include <limits.h>
+#include <vector>
 #include <string>
 #include <unistd.h>
 #include <sys/stat.h>
@@ -30,12 +32,22 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "dev.h"
 #include "timer.h"
 
+struct CustStat {
+       int id;
+       time_t start, end;
+};
+
+#define TMHIST_SIZE            16
+
 void post_redisplay(); // defined in main.cc
 
 int customer, ticket;
 static int report_inputs, cmd_echo;
 static long last_ticket_msec = LONG_MIN;
 
+static std::vector<CustStat> cstat;
+
+time_t calc_avg_wait();
 static void runcmd(const char *cmd);
 
 static int fd = -1;
@@ -123,6 +135,14 @@ void issue_ticket()
 {
        ticket++;
        last_ticket_msec = get_msec();
+
+       CustStat st;
+       st.id = ticket;
+       st.start = time(0);
+       st.end = (time_t)-1;
+       cstat.push_back(st);
+
+
        if(report_inputs) {
                fprintf(fp, "ticket: %d\n", ticket);
        }
@@ -135,6 +155,16 @@ void next_customer()
        if(customer < ticket) {
                customer++;
                last_ticket_msec = LONG_MIN;
+
+               for(size_t i=0; i<cstat.size(); i++) {
+                       if(cstat[i].id == customer) {
+                               cstat[i].end = time(0);
+                               fprintf(stderr, "start/end/interval: %lu %lu %lu\n", cstat[i].start,
+                                               cstat[i].end, cstat[i].end - cstat[i].start);
+                               break;
+                       }
+               }
+
                if(report_inputs) {
                        fprintf(fp, "customer: %d\n", customer);
                }
@@ -143,6 +173,21 @@ void next_customer()
        }
 }
 
+time_t calc_avg_wait()
+{
+       int count = 0;
+       time_t sum = 0;
+
+       for(size_t i=0; i<cstat.size(); i++) {
+               if(cstat[i].end != (time_t)-1) {
+                       sum += cstat[i].end - cstat[i].start;
+                       count++;
+               }
+       }
+
+       return count ? sum / count : 0;
+}
+
 #define TICKET_SHOW_DUR                1000
 
 int get_display_number()
@@ -207,9 +252,14 @@ static void runcmd(const char *cmd)
                next_customer();
                break;
 
+       case 'a':
+               fprintf(fp, "OK,avg wait time: %lu\r\n", (unsigned long)calc_avg_wait());
+               break;
+
        case 'h':
                fprintf(fp, "OK,commands: (e)cho, (v)ersion, (t)icket, (c)ustomer, "
-                               "(n)ext, (q)ueue, (r)eset, (i)nput-reports, (h)elp.\n");
+                               "(n)ext, (q)ueue, (a)verage wait time, (r)eset, (i)nput-reports, "
+                               "(h)elp.\n");
                break;
 
        default: