1 files changed, 115 insertions, 0 deletions
diff --git a/kernel/lifo.c b/kernel/lifo.c
new file mode 100644
index 000000000..4cd5a116c
--- /dev/null
+++ b/kernel/lifo.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2010-2015 Wind River Systems, Inc.
+ *
+ * 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.
+ */
+
+/** @file
+ *
+ * @brief dynamic-size LIFO queue object
+ */
+
+#include <kernel.h>
+#include <kernel_structs.h>
+#include <debug/object_tracing_common.h>
+#include <toolchain.h>
+#include <sections.h>
+#include <wait_q.h>
+#include <ksched.h>
+#include <init.h>
+
+extern struct k_lifo _k_lifo_list_start[];
+extern struct k_lifo _k_lifo_list_end[];
+
+struct k_lifo *_trace_list_k_lifo;
+
+#ifdef CONFIG_DEBUG_TRACING_KERNEL_OBJECTS
+
+/*
+ * Complete initialization of statically defined lifos.
+ */
+static int init_lifo_module(struct device *dev)
+{
+	ARG_UNUSED(dev);
+
+	struct k_lifo *lifo;
+
+	for (lifo = _k_lifo_list_start; lifo < _k_lifo_list_end; lifo++) {
+		SYS_TRACING_OBJ_INIT(k_lifo, lifo);
+	}
+	return 0;
+}
+
+SYS_INIT(init_lifo_module, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_OBJECTS);
+
+#endif /* CONFIG_DEBUG_TRACING_KERNEL_OBJECTS */
+
+void k_lifo_init(struct k_lifo *lifo)
+{
+	lifo->list = (void *)0;
+	sys_dlist_init(&lifo->wait_q);
+
+	SYS_TRACING_OBJ_INIT(k_lifo, lifo);
+}
+
+void k_lifo_put(struct k_lifo *lifo, void *data)
+{
+	struct k_thread *first_pending_thread;
+	unsigned int key;
+
+	key = irq_lock();
+
+	first_pending_thread = _unpend_first_thread(&lifo->wait_q);
+
+	if (first_pending_thread) {
+		_abort_thread_timeout(first_pending_thread);
+		_ready_thread(first_pending_thread);
+
+		_set_thread_return_value_with_data(first_pending_thread,
+						   0, data);
+
+		if (!_is_in_isr() && _must_switch_threads()) {
+			(void)_Swap(key);
+			return;
+		}
+	} else {
+		*(void **)data = lifo->list;
+		lifo->list = data;
+	}
+
+	irq_unlock(key);
+}
+
+void *k_lifo_get(struct k_lifo *lifo, int32_t timeout)
+{
+	unsigned int key;
+	void *data;
+
+	key = irq_lock();
+
+	if (likely(lifo->list)) {
+		data = lifo->list;
+		lifo->list = *(void **)data;
+		irq_unlock(key);
+		return data;
+	}
+
+	if (timeout == K_NO_WAIT) {
+		irq_unlock(key);
+		return NULL;
+	}
+
+	_pend_current_thread(&lifo->wait_q, timeout);
+
+	return _Swap(key) ? NULL : _current->base.swap_data;
+}