Module: xenomai-head
Branch: master
Commit: 25435b03f8bcd76bdaa362a9f5db1a03586a95f8
URL:
http://git.xenomai.org/?p=xenomai-head.git;a=commit;h=25435b03f8bcd76bdaa362a9f5db1a03586a95f8
Author: Philippe Gerum <r...@xenomai.org>
Date: Sun Oct 10 12:51:34 2010 +0200
nucleus: introduce XNOTHER in thread state bits
We need a way to identify non real-time shadow threads quickly.
This patch introduces the XNOTHER bit in the per-thread state word to
this end.
---
include/nucleus/thread.h | 1 +
ksrc/nucleus/pod.c | 10 ++++++++++
ksrc/nucleus/shadow.c | 5 +++++
3 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/include/nucleus/thread.h b/include/nucleus/thread.h
index 0b13309..725233f 100644
--- a/include/nucleus/thread.h
+++ b/include/nucleus/thread.h
@@ -62,6 +62,7 @@
#define XNFPU 0x00100000 /**< Thread uses FPU */
#define XNSHADOW 0x00200000 /**< Shadow thread */
#define XNROOT 0x00400000 /**< Root thread (that is, Linux/IDLE) */
+#define XNOTHER 0x00800000 /**< Non real-time shadow (prio=0) */
/*! @} */ /* Ends doxygen comment group: nucleus_state_flags */
diff --git a/ksrc/nucleus/pod.c b/ksrc/nucleus/pod.c
index fb1f9cb..862838c 100644
--- a/ksrc/nucleus/pod.c
+++ b/ksrc/nucleus/pod.c
@@ -1898,6 +1898,16 @@ int __xnpod_set_thread_schedparam(struct xnthread
*thread,
xnsched_putback(thread);
#ifdef CONFIG_XENO_OPT_PERVASIVE
+ /*
+ * A non-real-time shadow may upgrade to real-time FIFO
+ * scheduling, but the latter may never downgrade to
+ * SCHED_NORMAL Xenomai-wise. In the valid case, we clear
+ * XNOTHER to reflect the change. Note that we keep handling
+ * non real-time shadow specifics in higher code layers, not
+ * to pollute the core scheduler with peculiarities.
+ */
+ if (sched_class == &xnsched_class_rt && sched_param->rt.prio > 0)
+ xnthread_clear_state(thread, XNOTHER);
if (propagate) {
if (xnthread_test_state(thread, XNRELAX))
xnshadow_renice(thread);
diff --git a/ksrc/nucleus/shadow.c b/ksrc/nucleus/shadow.c
index 586a08a..b25423c 100644
--- a/ksrc/nucleus/shadow.c
+++ b/ksrc/nucleus/shadow.c
@@ -1374,6 +1374,11 @@ int xnshadow_map(xnthread_t *thread, xncompletion_t
__user *u_completion,
thread->u_mode = u_mode;
+ if (xnthread_base_priority(thread) == 0 &&
+ current->policy == SCHED_NORMAL)
+ /* Non real-time shadow. */
+ xnthread_set_state(thread, XNOTHER);
+
if (u_completion) {
/*
* Send the renice signal if we are not migrating so that user
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