BUG/MEDIUM: pollers: Use a global list for fd shared between threads.
With the old model, any fd shared by multiple threads, such as listeners
or dns sockets, would only be updated on one threads, so that could lead
to missed event, or spurious wakeups.
To avoid this, add a global list for fd that are shared, using the same
implementation as the fd cache, and only remove entries from this list
when every thread as updated its poller.
[wt: this will need to be backported to 1.8 but differently so this patch
must not be backported as-is]
diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index 0f10b48..e27ecc6 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -256,6 +256,8 @@
int thread_no_sync(void);
int thread_need_sync(void);
+extern unsigned long all_threads_mask;
+
#if defined(DEBUG_THREAD) || defined(DEBUG_FULL)
/* WARNING!!! if you update this enum, please also keep lock_label() up to date below */