igb_avb: patch for Realtime systems which require Priority inheritence
Posted by Anonymous on Thu 12th Oct 2023 10:33
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# igb_avb patch for Realtime systems which require Priority inheritence
# based on https://github.com/Avnu/igb_avb.git
diff --git a/lib/igb.c b/lib/igb.c
index 00a3560..4a79e98 100644
--- a/lib/igb.c
+++ b/lib/igb.c
@@ -2562,6 +2562,14 @@ static int igb_create_lock(struct adapter *adapter)

                attr_allocated = true;

+#if ((_POSIX_THREAD_ROBUST_PRIO_INHERIT-0) < 200809L)
+/* Protect against libc implementations which do not support this */
+#error Priority inheritence not supported for robust mutexes with this pthread implementation
+#endif
+               // to be used for both inter-process and inter-thread synchronization
+               if (pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT) != 0)
+                       goto err;
+
                // to be used for both inter-process and inter-thread synchronization
                if (pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED) != 0)
                        goto err;