Module: xenomai-rpm
Branch: for-upstream
Commit: 510d426f81a5f32ec96a95b0678436242b83bd2e
URL:
http://git.xenomai.org/?p=xenomai-rpm.git;a=commit;h=510d426f81a5f32ec96a95b0678436242b83bd2e
Author: Philippe Gerum <r...@xenomai.org>
Date: Mon Mar 29 10:47:09 2010 +0200
native/buffer: reset buffer descriptor upon r/w preemption
In order to perform data copy while reading/writing data from/to a
buffer descriptor in a lockless manner, we rely on a control token for
detecting any preemption that shall lead to invalidating the current
buffer, before redoing the data acquisition.
Make sure to reset the buffer descriptor appropriately, before redoing
the acquisition, so that the old contents are discarded.
---
ksrc/skins/native/buffer.c | 8 ++++++--
1 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/ksrc/skins/native/buffer.c b/ksrc/skins/native/buffer.c
index 2d364bb..8aca559 100644
--- a/ksrc/skins/native/buffer.c
+++ b/ksrc/skins/native/buffer.c
@@ -400,8 +400,10 @@ redo:
* the message, we have to resend the whole
* thing.
*/
- if (bf->wrtoken != wrtoken)
+ if (bf->wrtoken != wrtoken) {
+ xnbufd_reset(bufd);
goto redo;
+ }
wroff = (wroff + n) % bf->bufsz;
rbytes -= n;
@@ -557,8 +559,10 @@ redo:
* the message, we have to re-read the whole
* thing.
*/
- if (bf->rdtoken != rdtoken)
+ if (bf->rdtoken != rdtoken) {
+ xnbufd_reset(bufd);
goto redo;
+ }
rdoff = (rdoff + n) % bf->bufsz;
rbytes -= n;
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