RTOS: Unify wipe-out of thread list

Each RTOS implementation uses it's own (similar) code to free
the thread list. There are some additional issues:

<--->
if (pointer != NULL)
	free(pointer);
<--->
This is not necessary, free(NULL) is perfectly ok.

<--->
free(rtos->thread_details);
rtos->thread_details = NULL;
rtos->thread_count = 0;
<--->
The 3rd line has been missing for all RTOS but ChibiOs. There are paths
in the code where rtos->thread_count is never set to NULL, which can
lead to null pointer dereference of rtos->thread_details.

Change-Id: I6f7045c3d4518b925cb80dd5c907a566536b34ad
Signed-off-by: Christian Eggers <ceggers@gmx.de>
---
Changelog:
v7:
- rtos_wipe_threadlist() --> rtos_free_threadlist()
- removed non related changes in gdb_server.c from this patch
v3:
- Removed world "topic" from first line of commit message
v2:
- typo: "whipe" --> "wipe"
Reviewed-on: http://openocd.zylin.com/1916
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

1 files changed, 1 insertions, 19 deletions

diff --git a/src/rtos/ThreadX.c b/src/rtos/ThreadX.c
index 19dc463..add34b4 100644
--- a/src/rtos/ThreadX.c
+++ b/src/rtos/ThreadX.c
@@ -155,25 +155,7 @@ static int ThreadX_update_threads(struct rtos *rtos)
 	}
 
 	/* wipe out previous thread details if any */
-	if (rtos->thread_details != NULL) {
-		int j;
-		for (j = 0; j < rtos->thread_count; j++) {
-			if (rtos->thread_details[j].display_str != NULL) {
-				free(rtos->thread_details[j].display_str);
-				rtos->thread_details[j].display_str = NULL;
-			}
-			if (rtos->thread_details[j].thread_name_str != NULL) {
-				free(rtos->thread_details[j].thread_name_str);
-				rtos->thread_details[j].thread_name_str = NULL;
-			}
-			if (rtos->thread_details[j].extra_info_str != NULL) {
-				free(rtos->thread_details[j].extra_info_str);
-				rtos->thread_details[j].extra_info_str = NULL;
-			}
-		}
-		free(rtos->thread_details);
-		rtos->thread_details = NULL;
-	}
+	rtos_free_threadlist(rtos);
 
 	/* read the current thread id */
 	retval = target_read_buffer(rtos->target,