Module: xenomai-2.6
Branch: master
Commit: b0ece7f1365464fea6cffd93a1e3155adf1064ad
URL:
http://git.xenomai.org/?p=xenomai-2.6.git;a=commit;h=b0ece7f1365464fea6cffd93a1e3155adf1064ad
Author: Gilles Chanteperdrix <gilles.chanteperd...@xenomai.org>
Date: Sun Sep 21 20:46:37 2014 +0200
vfile/snapshot: avoid starvation by spinning 1us after every iteration
---
ksrc/nucleus/vfile.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/ksrc/nucleus/vfile.c b/ksrc/nucleus/vfile.c
index c8e0363..066c12f 100644
--- a/ksrc/nucleus/vfile.c
+++ b/ksrc/nucleus/vfile.c
@@ -279,6 +279,15 @@ redo:
data += vfile->datasz;
it->nrdata++;
}
+#ifdef CONFIG_SMP
+ {
+ /* Leave some time for other cpus to get the lock */
+ xnticks_t wakeup = xnarch_get_cpu_tsc();
+ wakeup += xnarch_ns_to_tsc(1000);
+ while ((xnsticks_t)(xnarch_get_cpu_tsc() - wakeup) < 0)
+ cpu_relax();
+ }
+#endif
}
if (ret < 0) {
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