PM remembers what it should schedule

- while PM implements fork also for RS it needs to remember what to
  schedule and what not. PM_SCHEDULED flag serves this purpose.

- PM only schedules processes that are descendaints of init, i.e. normal
  user processes

- after a process is forked PM schedules for the first time only
  processes that have PM_SCHEDULED set. The others are handled iether
  by kernel or some other scheduler

servers/pm/forkexit.c

@@ -92,7 +92,7 @@ PUBLIC int do_fork()
 	sigemptyset(&rmc->mp_sigtrace);
   }
   /* Inherit only these flags. In normal fork(), PRIV_PROC is not inherited. */
-  rmc->mp_flags &= (IN_USE|DELAY_CALL);
+  rmc->mp_flags &= (IN_USE|DELAY_CALL|PM_SCHEDULED);
   rmc->mp_child_utime = 0;		/* reset administration */
   rmc->mp_child_stime = 0;		/* reset administration */
   rmc->mp_exitstatus = 0;

servers/pm/main.c

@@ -505,7 +505,8 @@ PRIVATE void handle_fs_reply()
 
   case PM_FORK_REPLY:
 	/* Schedule the newly created process ... */
-	schedule_process(rmp);
+	if (rmp->mp_flags & PM_SCHEDULED)
+		schedule_process(rmp);
 	/* ... and wake it up */
 	setreply(proc_n, OK);
 

servers/pm/mproc.h

@@ -82,6 +82,7 @@ EXTERN struct mproc {
 #define TRACE_EXIT	0x08000	/* tracer is forcing this process to exit */
 #define TRACE_ZOMBIE	0x10000	/* waiting for tracer to issue WAIT call */
 #define DELAY_CALL	0x20000	/* waiting for call before sending signal */
+#define PM_SCHEDULED	0x40000 /* this process is scheduled by PM */
 
 #define NIL_MPROC ((struct mproc *) 0)
 

servers/pm/schedule.c

@@ -69,6 +69,7 @@ PUBLIC void overtake_scheduling(void)
 			if (sys_schedctl(trmp->mp_endpoint))
 				printf("PM: Error while overtaking scheduling for %s\n",
 					trmp->mp_name);
+			trmp->mp_flags |= PM_SCHEDULED;
 		}
 	}