From 04878ef74512df49803d1119c72c49cd8f1bfe10 Mon Sep 17 00:00:00 2001
From: Michael Brown
Date: Mon, 10 Aug 2009 01:09:41 +0100
Subject: [process] Make it safe to call process_add() multiple times

---
 src/core/process.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

(limited to 'src/core')

diff --git a/src/core/process.c b/src/core/process.c
index 6dacd6652..9c13e0204 100644
--- a/src/core/process.c
+++ b/src/core/process.c
@@ -37,11 +37,18 @@ static LIST_HEAD ( run_queue );
  * Add process to process list
  *
  * @v process		Process
+ *
+ * It is safe to call process_add() multiple times; further calls will
+ * have no effect.
  */
 void process_add ( struct process *process ) {
-	DBGC ( process, "PROCESS %p starting\n", process );
-	ref_get ( process->refcnt );
-	list_add_tail ( &process->list, &run_queue );
+	if ( list_empty ( &process->list ) ) {
+		DBGC ( process, "PROCESS %p starting\n", process );
+		ref_get ( process->refcnt );
+		list_add_tail ( &process->list, &run_queue );
+	} else {
+		DBGC ( process, "PROCESS %p already started\n", process );
+	}
 }
 
 /**
-- 
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