scheduler: remove lock file when scheduler caught SIGTERM

svn path=/trunk/boinc/; revision=25402

checkin_notes

@@ -2540,3 +2540,10 @@ David  10 Mar 2012
 
     vda/
         stats.cpp,h (new)
+
+Bernd  12 Mar 2012
+    - scheduler: remove lock file when scheduler caught SIGTERM
+
+    sched/
+        handle_request.h
+        sched_main.cpp

sched/handle_request.h

@@ -20,3 +20,5 @@
 extern void handle_request(
     FILE* fin, FILE* fout, char* code_sign_key
 );
+
+extern void unlock_sched(void);

sched/sched_main.cpp

@@ -210,6 +210,7 @@ void sigterm_handler(int /*signo*/) {
     log_messages.printf(MSG_CRITICAL,
         "Caught SIGTERM (sent by Apache); exiting\n"
     );
+    unlock_sched();
     fflush((FILE*)NULL);
     exit(1);
     return;