Diff: mbed-os/events/mbed_shared_queues.cpp

Revision:

0:9b3d4731edbb

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/events/mbed_shared_queues.cpp	Thu Jun 21 13:51:43 2018 +0000
@@ -0,0 +1,72 @@
+/* events
+ * Copyright (c) 2017 ARM Limited
+ *
+ * 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.
+ */
+
+#include "events/mbed_shared_queues.h"
+#include "mbed.h"
+
+using namespace events;
+
+namespace mbed {
+
+#ifdef MBED_CONF_RTOS_PRESENT
+/* Create an event queue, and start the thread that dispatches it. Static
+ * variables mean this happens once the first time each template instantiation
+ * is called. This is currently instantiated no more than twice.
+ */
+template
+<osPriority Priority, size_t QueueSize, size_t StackSize>
+EventQueue *do_shared_event_queue_with_thread()
+{
+    static uint64_t queue_buffer[QueueSize / sizeof(uint64_t)];
+    static EventQueue queue(sizeof queue_buffer, (unsigned char *) queue_buffer);
+
+    static uint64_t stack[StackSize / sizeof(uint64_t)];
+    static Thread thread(Priority, StackSize, (unsigned char *) stack);
+
+    Thread::State state = thread.get_state();
+    if (state == Thread::Inactive || state == Thread::Deleted) {
+        osStatus status = thread.start(callback(&queue, &EventQueue::dispatch_forever));
+        MBED_ASSERT(status == osOK);
+        if (status != osOK) {
+            return NULL;
+        }
+    }
+
+    return &queue;
+}
+#endif
+
+EventQueue *mbed_event_queue()
+{
+#if MBED_CONF_EVENTS_SHARED_DISPATCH_FROM_APPLICATION || !defined MBED_CONF_RTOS_PRESENT
+    /* Only create the EventQueue, but no dispatching thread */
+    static unsigned char queue_buffer[MBED_CONF_EVENTS_SHARED_EVENTSIZE];
+    static EventQueue queue(sizeof queue_buffer, queue_buffer);
+
+    return &queue;
+#else
+    return do_shared_event_queue_with_thread<osPriorityNormal, MBED_CONF_EVENTS_SHARED_EVENTSIZE, MBED_CONF_EVENTS_SHARED_STACKSIZE>();
+#endif
+}
+
+#ifdef MBED_CONF_RTOS_PRESENT
+EventQueue *mbed_highprio_event_queue()
+{
+    return do_shared_event_queue_with_thread<osPriorityHigh, MBED_CONF_EVENTS_SHARED_HIGHPRIO_EVENTSIZE, MBED_CONF_EVENTS_SHARED_HIGHPRIO_STACKSIZE>();
+}
+#endif
+
+}