ensure scheduling priority is inherited into new threads (issue #5293)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@6692 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/utils.c b/utils.c
index bb3a3e5..79d7336 100755 (executable)
--- a/utils.c
+++ b/utils.c
@@ -475,6 +475,19 @@ int ast_pthread_create_stack(pthread_t *thread, pthread_attr_t *attr, void *(*st
                pthread_attr_init(&lattr);
                attr = &lattr;
        }
+#ifdef __linux__
+       /* On Linux, pthread_attr_init() defaults to PTHREAD_EXPLICIT_SCHED,
+          which is kind of useless. Change this here to
+          PTHREAD_INHERIT_SCHED; that way the -p option to set realtime
+          priority will propagate down to new threads by default.
+          This does mean that callers cannot set a different priority using
+          PTHREAD_EXPLICIT_SCHED in the attr argument; instead they must set
+          the priority afterwards with pthread_setschedparam(). */
+       errno = pthread_attr_setinheritsched(attr, PTHREAD_INHERIT_SCHED);
+       if (errno)
+               ast_log(LOG_WARNING, "pthread_attr_setinheritsched returned non-zero: %s\n", strerror(errno));
+#endif
+
        if (!stacksize)
                stacksize = AST_STACKSIZE;
        errno = pthread_attr_setstacksize(attr, stacksize);