[Xenomai] [PATCH] posix: Skip auto-shadowing if current thread is already shadowed

[Jan Kiszka <jan.kiszka@siemens.com>]

While the user can also avoid double shadowing by providing the
XENO_NOSHADOW environment variable, there is still no reason to attempt
auto-shadowing in their absence if the current thread is already a
Xenomai thread. This helps, e.g., in complex dlopen scenarios where
the POSIX lib is pulled in belatedly, potentially after some other lib
already shadowed the dlopen caller.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 src/skins/posix/init.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/skins/posix/init.c b/src/skins/posix/init.c
index 80725c5..ca1d9e1 100644
--- a/src/skins/posix/init.c
+++ b/src/skins/posix/init.c
@@ -31,6 +31,7 @@
 #include <rtdk.h>
 
 #include <asm-generic/xenomai/bind.h>
+#include <asm-generic/xenomai/current.h>
 
 int __pse51_muxid = -1;
 int __pse51_rtdm_muxid = -1;
@@ -67,7 +68,7 @@ static __constructor__ void __init_posix_interface(void)
 	}
 
 	noshadow = getenv("XENO_NOSHADOW");
-	if (!noshadow || !*noshadow) {
+	if ((!noshadow || !*noshadow) && xeno_get_current() == XN_NO_HANDLE) {
 		err = __real_pthread_getschedparam(pthread_self(), &policy,
 						   &parm);
 		if (err) {
-- 
1.7.3.4