Import Mbed OS hard-float snapshot

platform/source/DeepSleepLock.cpp

@@ -0,0 +1,62 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017-2019 ARM Limited
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * 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 "platform/DeepSleepLock.h"
+
+#include "platform/mbed_atomic.h"
+#include "platform/mbed_critical.h"
+#include "platform/mbed_error.h"
+#include "platform/mbed_power_mgmt.h"
+
+namespace mbed {
+
+DeepSleepLock::DeepSleepLock(): _lock_count(1)
+{
+    sleep_manager_lock_deep_sleep();
+}
+
+DeepSleepLock::~DeepSleepLock()
+{
+    if (_lock_count) {
+        sleep_manager_unlock_deep_sleep();
+    }
+}
+
+void DeepSleepLock::lock()
+{
+    uint16_t count = core_util_atomic_incr_u16(&_lock_count, 1);
+    if (1 == count) {
+        sleep_manager_lock_deep_sleep();
+    }
+    if (0 == count) {
+        MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_OVERFLOW), "DeepSleepLock overflow (> USHRT_MAX)", count);
+    }
+}
+
+void DeepSleepLock::unlock()
+{
+    uint16_t count = core_util_atomic_decr_u16(&_lock_count, 1);
+    if (count == 0) {
+        sleep_manager_unlock_deep_sleep();
+    }
+    if (count == USHRT_MAX) {
+        core_util_critical_section_exit();
+        MBED_ERROR1(MBED_MAKE_ERROR(MBED_MODULE_PLATFORM, MBED_ERROR_CODE_UNDERFLOW), "DeepSleepLock underflow (< 0)", count);
+    }
+}
+
+} // namespace mbed