Module: xenomai-forge
Branch: next
Commit: 9137bdfe0b0881d04750c8e92e065657e7a9538e
URL:
http://git.xenomai.org/?p=xenomai-forge.git;a=commit;h=9137bdfe0b0881d04750c8e92e065657e7a9538e
Author: Philippe Gerum <r...@xenomai.org>
Date: Fri Jun 6 15:24:02 2014 +0200
lib/cobalt: do not route relaxed threads to standard sched_yield()
Doing so for real-time threads brings no upside, and uselessly delays
switch back to primary mode. Conversely, this change makes
sched_yield() act as a conforming call for Xenomai threads which may
be helpful in some cases.
Xenomai threads which belong to the weak scheduling policy still yield
CPU via the regular sched_yield() service though, since they naturally
run in relaxed mode, unless Cobalt wants them to temporarily run in
primary mode (i.e. because they hold some critical resource).
---
lib/cobalt/thread.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)
diff --git a/lib/cobalt/thread.c b/lib/cobalt/thread.c
index e8c8961..821bfe5 100644
--- a/lib/cobalt/thread.c
+++ b/lib/cobalt/thread.c
@@ -163,21 +163,11 @@ int pthread_getschedparam_ex(pthread_t thread,
COBALT_IMPL(int, sched_yield, (void))
{
- unsigned long status;
- int ret;
-
- status = cobalt_get_current_mode();
- if (status & XNRELAX)
- goto libc_yield;
-
- ret = -XENOMAI_SKINCALL0(__cobalt_muxid, sc_cobalt_sched_yield);
- if (ret == EPERM)
- goto libc_yield;
-
- return ret;
+ if (cobalt_get_current() == XN_NO_HANDLE ||
+ (cobalt_get_current_mode() & (XNWEAK|XNRELAX)) == (XNWEAK|XNRELAX))
+ return __STD(sched_yield());
-libc_yield:
- return __STD(sched_yield());
+ return -XENOMAI_SKINCALL0(__cobalt_muxid, sc_cobalt_sched_yield);
}
COBALT_IMPL(int, sched_get_priority_min, (int policy))
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