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_r167164236
 
 

 ##########
 File path: porting/linux/os/os_atomic.c
 ##########
 @@ -0,0 +1,35 @@
+/*
+ * 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 <stdint.h>
+#include <pthread.h>
+
+pthread_mutex_t s_mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+pthread_cond_t s_cond = PTHREAD_COND_INITIALIZER;
+
+void os_atomic_begin()
+{
+    pthread_mutex_lock(&s_mutex);
+}
+
+void os_atomic_end()
+{
+    pthread_mutex_unlock(&s_mutex);
+    pthread_cond_signal(&s_cond);
 
 Review comment:
   why this conditional is needed? there seems to be no pthread_cond_wait() 
called anywhere for s_cond

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