Add checks for tasks woken up on other CPUs where needed, make xYieldPending and xPendingReadyList per-processor, add configurable ISR stack size to Kconfig, in general fix the entire wake-up-task-on-other-cpu-by-interrupt implementation

components/esp32/include/esp_crosscore_int.h

@@ -1,8 +1,35 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
 #ifndef __ESP_CROSSCORE_INT_H
 #define __ESP_CROSSCORE_INT_H
 
 
+/**
+ * Initialize the crosscore interrupt system for this CPU.
+ * This needs to be called once on every CPU that is used
+ * by FreeRTOS.
+ */
 void esp_crosscore_int_init();
+
+
+/**
+ * Send an interrupt to a CPU indicating it should yield its
+ * currently running task in favour of a higher-priority task
+ * that presumably just woke up.
+ *
+ * @param coreID Core that should do the yielding
+ */
 void esp_crosscore_int_send_yield(int coreId);
 
 #endif