From 32bac84548078ca697bcfa6154902288d6c61b88 Mon Sep 17 00:00:00 2001
From: igd <liguiding@pinecone.net>
Date: Mon, 26 Aug 2019 10:54:49 -0600
Subject: [PATCH] sched/Kconfig, sched/signal/sig_notification.c:  Add
 configuration option to decide select either the high-priority or
 low-priority work queue for SIG_EVTHREAD notifications.

---
 sched/Kconfig                   | 13 +++++++++++++
 sched/signal/sig_notification.c | 10 ++++++++--
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/sched/Kconfig b/sched/Kconfig
index 90cc7b42c20..430f62316fe 100644
--- a/sched/Kconfig
+++ b/sched/Kconfig
@@ -1340,6 +1340,19 @@ config SIG_EVTHREAD
 		different mechanism would need to be development to support this
 		feature on the PROTECTED or KERNEL build.
 
+config SIG_EVTHREAD_HPWORK
+	bool "SIGEV_EVTHREAD use HPWORK"
+	default n
+	depends on SIG_EVTHREAD && CONFIG_SCHED_HPWORK
+	---help---
+		if selected, SIGEV_THHREAD will use the high priority work queue.
+		If not, it will use the low priority work queue (if available).
+
+		REVISIT:  This solution is non-optimal.  Some notifications should
+		be high priority and others should be lower priority.  Ideally, you
+		should be able to determine which work queue is used on a
+		notification-by-notification basis.
+
 menuconfig SIG_DEFAULT
 	bool "Default signal actions"
 	default n
diff --git a/sched/signal/sig_notification.c b/sched/signal/sig_notification.c
index 38c1059718a..68b0fb7ded6 100644
--- a/sched/signal/sig_notification.c
+++ b/sched/signal/sig_notification.c
@@ -53,6 +53,12 @@
 #include "sched/sched.h"
 #include "signal/signal.h"
 
+#ifdef CONFIG_SIG_EVTHREAD_HPWORK
+#  define SIG_EVTHREAD_WORK HPWORK
+#else
+#  define SIG_EVTHREAD_WORK LPWORK
+#endif
+
 /****************************************************************************
  * Name: nxsig_notification_worker
  *
@@ -166,7 +172,7 @@ int nxsig_notification(pid_t pid, FAR struct sigevent *event,
 
       /* Then queue the work */
 
-      return work_queue(LPWORK, &work->work,
+      return work_queue(SIG_EVTHREAD_WORK, &work->work,
                         nxsig_notification_worker, work, 0);
     }
 #endif
@@ -191,6 +197,6 @@ int nxsig_notification(pid_t pid, FAR struct sigevent *event,
 #ifdef CONFIG_SIG_EVTHREAD
 void nxsig_cancel_notification(FAR struct sigwork_s *work)
 {
-  work_cancel(LPWORK, &work->work);
+  work_cancel(SIG_EVTHREAD_WORK, &work->work);
 }
 #endif