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lib/bt/common/osi/mutex.c

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+/******************************************************************************
+ *
+ *  Copyright (C) 2015 Google, 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.
+ *
+ ******************************************************************************/
+
+#include "osi/mutex.h"
+
+
+/* static section */
+static osi_mutex_t gl_mutex; /* Recursive Type */
+
+
+/** Create a new mutex
+ * @param mutex pointer to the mutex to create
+ * @return a new mutex */
+int osi_mutex_new(osi_mutex_t *mutex)
+{
+    int xReturn = -1;
+
+    *mutex = xSemaphoreCreateMutex();
+
+    if (*mutex != NULL) {
+        xReturn = 0;
+    }
+
+    return xReturn;
+}
+
+/** Lock a mutex
+ * @param mutex the mutex to lock */
+int osi_mutex_lock(osi_mutex_t *mutex, uint32_t timeout)
+{
+    int ret = 0;
+
+    if (timeout == OSI_MUTEX_MAX_TIMEOUT) {
+        if (xSemaphoreTake(*mutex, portMAX_DELAY) != pdTRUE) {
+            ret = -1;
+        }
+    } else {
+        if (xSemaphoreTake(*mutex, timeout / portTICK_PERIOD_MS) != pdTRUE)  {
+            ret = -2;
+        }
+    }
+
+    return ret;
+}
+
+/** Unlock a mutex
+ * @param mutex the mutex to unlock */
+void osi_mutex_unlock(osi_mutex_t *mutex)
+{
+    xSemaphoreGive(*mutex);
+}
+
+/** Delete a semaphore
+ * @param mutex the mutex to delete */
+void osi_mutex_free(osi_mutex_t *mutex)
+{
+    vSemaphoreDelete(*mutex);
+    *mutex = NULL;
+}
+
+int osi_mutex_global_init(void)
+{
+    gl_mutex = xSemaphoreCreateRecursiveMutex();
+    if (gl_mutex == NULL) {
+        return -1;
+    }
+
+    return 0;
+}
+
+void osi_mutex_global_deinit(void)
+{
+    vSemaphoreDelete(gl_mutex);
+}
+
+void osi_mutex_global_lock(void)
+{
+    xSemaphoreTakeRecursive(gl_mutex, portMAX_DELAY);
+}
+
+void osi_mutex_global_unlock(void)
+{
+    xSemaphoreGiveRecursive(gl_mutex);
+}