Refactor OpenThread Global Variables into a Single Context Structure (#357)

* Refactor OpenThread to contain all global/static variables in a single context structure.

include/openthread-types.h

@@ -44,6 +44,26 @@
 extern "C" {
 #endif
 
+#ifdef _WIN32
+#ifdef WINDOWS_KERNEL
+#include <ntdef.h>
+#else
+#include <windows.h>
+#endif
+#else
+#ifndef CONTAINING_RECORD
+/*#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Winvalid-offsetof"
+#define CONTAINING_RECORD(address, type, field) \
+    ((type *)((uint8_t*)(address) - offsetof(type, field)))
+#pragma GCC diagnostic pop*/
+#define BASE 0x1
+#define myoffsetof(s,m) (((size_t)&(((s*)BASE)->m))-BASE)
+#define CONTAINING_RECORD(address, type, field) \
+    ((type *)((uint8_t*)(address) - myoffsetof(type, field)))
+#endif
+#endif
+
 /**
  * This type represents the OpenThread instance structure.
  */

include/openthread.h

@@ -1621,6 +1621,8 @@ void otPlatformReset(otInstance *aInstance);
 /**
  * Get the ROUTER_DOWNGRADE_THRESHOLD parameter used in the Router role.
  *
+ * @param[in]  aInstance  A pointer to an OpenThread instance.
+ *
  * @returns The ROUTER_DOWNGRADE_THRESHOLD value.
  *
  * @sa otSetRouterDowngradeThreshold
@@ -1630,6 +1632,7 @@ uint8_t otGetRouterDowngradeThreshold(otInstance *aInstance);
 /**
  * Set the ROUTER_DOWNGRADE_THRESHOLD parameter used in the Leader role.
  *
+ * @param[in]  aInstance   A pointer to an OpenThread instance.
  * @param[in]  aThreshold  The ROUTER_DOWNGRADE_THRESHOLD value.
  *
  * @sa otGetRouterDowngradeThreshold