- client: on startup, detect when the system clock has been set backwards,

and clear all timeout variables.
    This should fix the situation where, say:
    1) the user sets the system clock forward by a year;
    2) all projects get their min_rpc_time set;
    3) the user sets the system clock back to the correct time.
    Previously, BOINC would not do anything for a year.

    Note: a restart of BOINC is required to fix things.
    It would be harder to do this on the fly.

svn path=/trunk/boinc/; revision=15314

checkin_notes

@@ -4478,3 +4478,20 @@ Rom    May 28 2008 (HEAD)
         configure.ac
         version.h
 
+David  May 28 2008
+    - client: on startup, detect when the system clock has been set backwards,
+        and clear all timeout variables.
+        This should fix the situation where, say:
+        1) the user sets the system clock forward by a year;
+        2) all projects get their min_rpc_time set;
+        3) the user sets the system clock back to the correct time.
+        Previously, BOINC would not do anything for a year.
+
+        Note: a restart of BOINC is required to fix things.
+        It would be harder to do this on the fly.
+
+    client/
+        client_state.C,h
+        client_types.h
+        pers_file_xfer.h
+        time_stats.h

client/client_state.C

@@ -245,6 +245,8 @@ int CLIENT_STATE::init() {
     set_ncpus();
     show_host_info();
 
+    check_clock_reset();
+
     coprocs.get();
 #if 0
     fake_cuda(coprocs);
@@ -1573,4 +1575,38 @@ double calculate_exponential_backoff( int n, double MIN, double MAX) {
     return rand_range(MIN, rmax);
 }
 
+// See if a timestamp in the client state file
+// is later than the current time.
+// If so, the user must have decremented the system clock.
+// Clear all timeout variables.
+//
+void CLIENT_STATE::check_clock_reset() {
+    now = time(0);
+    if (!time_stats.last_update) return;
+    if (time_stats.last_update <= now) return;
+
+    msg_printf(NULL, MSG_INFO,
+        "System clock was turned backwards; clearing timeouts"
+    );
+    new_version_check_time = now;
+    all_projects_list_check_time = now;
+
+    unsigned int i;
+    for (i=0; i<projects.size(); i++) {
+        PROJECT* p = projects[i];
+        p->min_rpc_time = 0;
+        if (p->next_rpc_time) {
+            p->next_rpc_time = now;
+        }
+        p->next_file_xfer_up = 0;
+        p->next_file_xfer_down = 0;
+    }
+    for (i=0; i<pers_file_xfers->pers_file_xfers.size(); i++) {
+        PERS_FILE_XFER* pfx = pers_file_xfers->pers_file_xfers[i];
+        pfx->next_request_time = 0;
+    }
+
+    // RESULT: could change report_deadline, but not clear how
+}
+
 const char *BOINC_RCSID_e836980ee1 = "$Id$";

client/client_state.h

@@ -241,6 +241,7 @@ private:
     bool garbage_collect_always();
     bool update_results();
     int nresults_for_project(PROJECT*);
+    void check_clock_reset();
 
 // --------------- cpu_sched.C:
 private:

client/client_types.h

@@ -408,13 +408,11 @@ public:
     // Also, none of this is used right now (commented out)
     //
 #define FILE_XFER_FAILURE_LIMIT 3
-private:
     int file_xfer_failures_up;
     int file_xfer_failures_down;
     double next_file_xfer_up;
     double next_file_xfer_down;
 
-public:
     double next_file_xfer_time(const bool);
     void file_xfer_failed(const bool);
     void file_xfer_succeeded(const bool);

client/pers_file_xfer.h

@@ -116,8 +116,8 @@ public:
 };
 
 class PERS_FILE_XFER_SET {
-    FILE_XFER_SET* file_xfers;
 public:
+    FILE_XFER_SET* file_xfers;
     std::vector<PERS_FILE_XFER*>pers_file_xfers;
 
     PERS_FILE_XFER_SET(FILE_XFER_SET*);

client/time_stats.h

@@ -24,10 +24,10 @@
 #include <vector>
 
 class TIME_STATS {
-    double last_update;
     bool first;
     int previous_connected_state;
 public:
+    double last_update;
 // we maintain an exponentially weighted average of these quantities:
     double on_frac;
         // the fraction of total time this host runs the core client