client: fix problems with exclusive_gpu_app feature

svn path=/trunk/boinc/; revision=22310

checkin_notes

@@ -6308,3 +6308,12 @@ David  29 Aug 2010
             login_action.php
             create_account_form.php
             create_account_action.php
+
+Charlie 31 Aug 2010
+    - client: fix problems with exclusive_gpu_app feature.
+    
+    client/
+        app.cpp
+        client_state.cpp
+    lib/
+        procinfo_mac.cpp

client/app.cpp

@@ -415,7 +415,6 @@ bool ACTIVE_TASK_SET::poll() {
     send_trickle_downs();
     graphics_poll();
     process_control_poll();
-    get_memory_usage();
     action |= check_rsc_limits_exceeded();
     get_msgs();
     for (i=0; i<active_tasks.size(); i++) {

client/client_state.cpp

@@ -627,6 +627,9 @@ bool CLIENT_STATE::poll_slow_events() {
     }
 #endif
 
+    // active_tasks.get_memory_usage() sets variables needed by 
+    // check_suspend_processing(), so it must be called first.
+    active_tasks.get_memory_usage();
     suspend_reason = check_suspend_processing();
 
     // suspend or resume activities (but only if already did startup)

lib/procinfo_mac.cpp

@@ -102,14 +102,14 @@ int procinfo_setup(vector<PROCINFO>& pi) {
 
 
     fd = popen("ps -axcopid,ppid,rss,vsz,pagein,time,command", "r");
-    if (!fd) return 0;
+    if (!fd) return ERR_FOPEN;
 
     // Skip over the header line
     do {
         c = fgetc(fd);
         if (c == EOF) {
             pclose(fd);
-            return 0;
+            return ERR_GETS;
         }
     } while (c != '\n');