sjanc commented on a change in pull request #4: [linux] initial port and osal 
additions.
URL: https://github.com/apache/mynewt-nimble/pull/4#discussion_r167164810
 
 

 ##########
 File path: porting/linux/os/os_mutex.c
 ##########
 @@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 <assert.h>
+#include <stdint.h>
+#include <string.h>
+#include "os/os.h"
+
+#include <pthread.h>
+
+os_error_t
+os_mutex_init(struct os_mutex *mu)
+{
+    if (!mu) {
+        return OS_INVALID_PARM;
+    }
+
+    pthread_mutexattr_t muAttr;
+    pthread_mutexattr_settype(&muAttr, PTHREAD_MUTEX_RECURSIVE_NP);
+    pthread_mutex_init(&mu->lock, &muAttr);
+
+    return OS_OK;
+}
+
+os_error_t
+os_mutex_release(struct os_mutex *mu)
+{
+    if (!mu) return OS_INVALID_PARM;
+
+    if (pthread_mutex_unlock(&mu->lock)) {
+        return OS_BAD_MUTEX;
+    }
+
+    return OS_OK;
+}
+
+os_error_t
+os_mutex_pend(struct os_mutex *mu, uint32_t timeout)
+{
+    if (!mu) return OS_INVALID_PARM;
 
 Review comment:
   coding style

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