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lib/bt/common/osi/semaphore.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/semaphore.h"
+
+/*-----------------------------------------------------------------------------------*/
+//  Creates and returns a new semaphore. The "init_count" argument specifies
+//  the initial state of the semaphore, "max_count" specifies the maximum value
+//  that can be reached.
+int osi_sem_new(osi_sem_t *sem, uint32_t max_count, uint32_t init_count)
+{
+    int ret = -1;
+
+    if (sem) {
+        *sem = xSemaphoreCreateCounting(max_count, init_count);
+        if ((*sem) != NULL) {
+            ret = 0;
+        }
+    }
+
+    return ret;
+}
+
+/*-----------------------------------------------------------------------------------*/
+// Give a semaphore
+void osi_sem_give(osi_sem_t *sem)
+{
+    xSemaphoreGive(*sem);
+}
+
+/*
+  Blocks the thread while waiting for the semaphore to be
+  signaled. If the "timeout" argument is non-zero, the thread should
+  only be blocked for the specified time (measured in
+  milliseconds).
+
+*/
+int
+osi_sem_take(osi_sem_t *sem, uint32_t timeout)
+{
+    int ret = 0;
+
+    if (timeout ==  OSI_SEM_MAX_TIMEOUT) {
+        if (xSemaphoreTake(*sem, portMAX_DELAY) != pdTRUE) {
+            ret = -1;
+        }
+    } else {
+        if (xSemaphoreTake(*sem, timeout / portTICK_PERIOD_MS) != pdTRUE) {
+            ret = -2;
+        }
+    }
+
+    return ret;
+}
+
+// Deallocates a semaphore
+void osi_sem_free(osi_sem_t *sem)
+{
+    vSemaphoreDelete(*sem);
+    *sem = NULL;
+}