[Xenomai-git] Philippe Gerum : lib/cobalt: limit regular SCHED_FIFO priority to the valid range

[git repository hosting]

Module: xenomai-forge
Branch: master
Commit: e7b43d30568b3c5753e83577bb370ee6fe43a5a5
URL:    
http://git.xenomai.org/?p=xenomai-forge.git;a=commit;h=e7b43d30568b3c5753e83577bb370ee6fe43a5a5

Author: Philippe Gerum <r...@xenomai.org>
Date:   Thu Jul 11 18:52:24 2013 +0200

lib/cobalt: limit regular SCHED_FIFO priority to the valid range

---

 lib/cobalt/thread.c |   21 ++++++++++++++-------
 1 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/lib/cobalt/thread.c b/lib/cobalt/thread.c
index 40179b6..19f57a8 100644
--- a/lib/cobalt/thread.c
+++ b/lib/cobalt/thread.c
@@ -33,6 +33,8 @@ static pthread_attr_ex_t default_attr_ex;
 
 static int linuxthreads;
 
+static int std_maxpri;
+
 static void prefault_stack(void)
 {
        if (pthread_self() == __cobalt_main_tid) {
@@ -57,6 +59,12 @@ static int libc_setschedparam(pthread_t thread,
        case SCHED_TP:
        case SCHED_SPORADIC:
                policy = SCHED_FIFO;
+               /*
+                * Our priority range is larger than the regular
+                * kernel's, limit the priority value accordingly.
+                */
+               if (priority > std_maxpri)
+                       priority = std_maxpri;
                break;
        default:
                policy = policy_ex;
@@ -434,15 +442,14 @@ COBALT_IMPL(int, pthread_kill, (pthread_t thread, int 
sig))
 
 static __attribute__((constructor)) void cobalt_thread_init(void)
 {
-       pthread_attr_init_ex(&default_attr_ex);
 #ifdef _CS_GNU_LIBPTHREAD_VERSION
-       {
-               char vers[128];
-               linuxthreads =
-                       !confstr(_CS_GNU_LIBPTHREAD_VERSION, vers, sizeof(vers))
-                       || strstr(vers, "linuxthreads");
-       }
+       char vers[128];
+       linuxthreads =
+               !confstr(_CS_GNU_LIBPTHREAD_VERSION, vers, sizeof(vers))
+               || strstr(vers, "linuxthreads");
 #else /* !_CS_GNU_LIBPTHREAD_VERSION */
        linuxthreads = 1;
 #endif /* !_CS_GNU_LIBPTHREAD_VERSION */
+       pthread_attr_init_ex(&default_attr_ex);
+       std_maxpri = __STD(sched_get_priority_max(SCHED_FIFO));
 }


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