Finished multi-slot functionality

svn path=/trunk/boinc/; revision=381

checkin_notes

@@ -1699,3 +1699,14 @@ David	August 25, 2002
 	test_uc_win.php
     tools/
 	add.C
+
+Eric  August 26, 2002
+    - Finished multi-slot functionality.  The client now requests an
+      open slot from the ACTIVE_TASK_SET which will be the slot
+      for the new process.
+
+    client/
+        app.C
+        app.h
+        cs_apps.C
+

client/app.C

@@ -648,6 +648,35 @@ bool ACTIVE_TASK_SET::poll_time() {
     return updated;
 }
 
+// Gets the next available free slot, or returns -1 if all slots are full
+//
+int ACTIVE_TASK_SET::get_free_slot(int total_slots) {
+    int start_slot,i;
+    char *slot_status;
+
+    if (active_tasks.size() >= total_slots)
+        return -1;
+    
+    slot_status = (char *)calloc( sizeof(char), total_slots );
+    if (!slot_status) return -1;
+    
+    for (i=0; i<active_tasks.size(); i++) {
+        if (active_tasks[i]->slot >= 0 && active_tasks[i]->slot < total_slots) {
+            slot_status[active_tasks[i]->slot] = 1;
+        }
+    }
+
+    for (i=0; i<total_slots; i++) {
+        if (!slot_status[i]) {
+            free(slot_status);
+            return i;
+        }
+    }
+
+    free(slot_status);
+    return -1;
+}
+
 // Write XML data about this ACTIVE_TASK
 //
 int ACTIVE_TASK::write(FILE* fout) {

client/app.h

@@ -98,6 +98,7 @@ public:
     void unsuspend_all();
     int restart_tasks();
     void exit_tasks();
+    int get_free_slot(int total_slots);
 
     int write(FILE*);
     int parse(FILE*, CLIENT_STATE*);

client/cs_apps.C

@@ -151,11 +151,14 @@ bool CLIENT_STATE::start_apps() {
     RESULT* rp;
     ACTIVE_TASK* atp;
     bool action = false;
+    int open_slot;
 
     for (i=0; i<results.size(); i++) {
         // If all the app slots are already used, we can't start
         // a new app
-        if (active_tasks.active_tasks.size() == nslots) {
+        open_slot = active_tasks.get_free_slot(nslots);
+        
+        if (open_slot < 0) {
             if (log_flags.task_debug) {
                 printf("start_apps(): all slots full\n");
             }
@@ -172,6 +175,7 @@ bool CLIENT_STATE::start_apps() {
             }
             rp->is_active = true;
             atp = new ACTIVE_TASK;
+            atp->slot = open_slot;
             atp->init(rp);
             active_tasks.insert(atp);
             action = true;