Change API to require all calls be from the same context. (#78)

* Remove atomic driver and all uses of otPlatAtomic* in OpenThread.
* Change posix example to only use a single thread of execution.

src/cli/cli_serial.cpp

@@ -50,9 +50,6 @@ static const char sEraseString[] = {'\b', ' ', '\b'};
 static const char CRNL[] = {'\r', '\n'};
 static Serial *sServer;
 
-Tasklet Serial::sReceiveTask(&ReceiveTask, NULL);
-Tasklet Serial::sSendDoneTask(&SendDoneTask, NULL);
-
 Serial::Serial(void)
 {
     sServer = this;
@@ -68,28 +65,20 @@ ThreadError Serial::Start(void)
     return kThreadError_None;
 }
 
-extern "C" void otPlatSerialSignalReceive(void)
+extern "C" void otPlatSerialReceived(const uint8_t *aBuf, uint16_t aBufLength)
 {
-    Serial::sReceiveTask.Post();
+    sServer->ReceiveTask(aBuf, aBufLength);
 }
 
-void Serial::ReceiveTask(void *aContext)
+void Serial::ReceiveTask(const uint8_t *aBuf, uint16_t aBufLength)
 {
-    sServer->ReceiveTask();
-}
-
-void Serial::ReceiveTask(void)
-{
-    uint16_t bufLength;
-    const uint8_t *buf;
     const uint8_t *end;
 
-    buf = otPlatSerialGetReceivedBytes(&bufLength);
-    end = buf + bufLength;
+    end = aBuf + aBufLength;
 
-    for (; buf < end; buf++)
+    for (; aBuf < end; aBuf++)
     {
-        switch (*buf)
+        switch (*aBuf)
         {
         case '\r':
         case '\n':
@@ -115,13 +104,11 @@ void Serial::ReceiveTask(void)
             break;
 
         default:
-            Output(reinterpret_cast<const char *>(buf), 1);
-            mRxBuffer[mRxLength++] = *buf;
+            Output(reinterpret_cast<const char *>(aBuf), 1);
+            mRxBuffer[mRxLength++] = *aBuf;
             break;
         }
     }
-
-    otPlatSerialHandleReceiveDone();
 }
 
 ThreadError Serial::ProcessCommand(void)
@@ -201,12 +188,7 @@ exit:
     return;
 }
 
-extern "C" void otPlatSerialSignalSendDone(void)
-{
-    Serial::sSendDoneTask.Post();
-}
-
-void Serial::SendDoneTask(void *aContext)
+extern "C" void otPlatSerialSendDone(void)
 {
     sServer->SendDoneTask();
 }

src/cli/cli_serial.hpp

@@ -80,8 +80,8 @@ public:
      */
     int OutputFormat(const char *fmt, ...);
 
-    static Tasklet sReceiveTask;
-    static Tasklet sSendDoneTask;
+    void ReceiveTask(const uint8_t *aBuf, uint16_t aBufLength);
+    void SendDoneTask(void);
 
 private:
     enum
@@ -91,12 +91,7 @@ private:
         kMaxLineLength = 128,
     };
 
-    static void ReceiveTask(void *aContext);
-    static void SendDoneTask(void *aContext);
-
     ThreadError ProcessCommand(void);
-    void ReceiveTask(void);
-    void SendDoneTask(void);
     void Send(void);
 
     char mRxBuffer[kRxBufferSize];

src/cli/cli_udp.hpp

@@ -80,7 +80,7 @@ public:
 private:
     enum
     {
-        kMaxLineLength = 80,
+        kMaxLineLength = 128,
     };
 
     static void HandleUdpReceive(void *aContext, otMessage aMessage, const otMessageInfo *aMessageInfo);