IVGCVSW-3431 Create Profiling Service State Machine

Change-Id: I30ae52d38181a91ce642e24919ad788902e42eb4
Signed-off-by: Nikhil Raj <nikhil.raj@arm.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/src/profiling/ProfilingStateMachine.cpp b/src/profiling/ProfilingStateMachine.cpp
new file mode 100644
index 0000000000..682e1b8894
--- /dev/null
+++ b/src/profiling/ProfilingStateMachine.cpp
@@ -0,0 +1,93 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "ProfilingStateMachine.hpp"
+
+#include <armnn/Exceptions.hpp>
+
+namespace armnn
+{
+
+namespace profiling
+{
+
+ProfilingState ProfilingStateMachine::GetCurrentState() const
+{
+    return m_State;
+}
+
+void ProfilingStateMachine::TransitionToState(ProfilingState newState)
+{
+     switch (newState)
+     {
+         case ProfilingState::Uninitialised:
+         {
+             ProfilingState expectedState = m_State.load(std::memory_order::memory_order_relaxed);
+             do {
+                 if (!IsOneOfStates(expectedState, ProfilingState::Uninitialised))
+                 {
+                     throw armnn::Exception(std::string("Cannot transition from state [")
+                                            + GetProfilingStateName(expectedState)
+                                            +"] to [" + GetProfilingStateName(newState) + "]");
+                 }
+             } while (!m_State.compare_exchange_strong(expectedState, newState,
+                      std::memory_order::memory_order_relaxed));
+
+             break;
+         }
+         case  ProfilingState::NotConnected:
+         {
+             ProfilingState expectedState = m_State.load(std::memory_order::memory_order_relaxed);
+             do {
+                 if (!IsOneOfStates(expectedState, ProfilingState::Uninitialised, ProfilingState::NotConnected,
+                                    ProfilingState::Active))
+                 {
+                     throw armnn::Exception(std::string("Cannot transition from state [")
+                                            + GetProfilingStateName(expectedState)
+                                            +"] to [" + GetProfilingStateName(newState) + "]");
+                 }
+             } while (!m_State.compare_exchange_strong(expectedState, newState,
+                      std::memory_order::memory_order_relaxed));
+
+             break;
+         }
+         case ProfilingState::WaitingForAck:
+         {
+             ProfilingState expectedState = m_State.load(std::memory_order::memory_order_relaxed);
+             do {
+                 if (!IsOneOfStates(expectedState, ProfilingState::NotConnected, ProfilingState::WaitingForAck))
+                 {
+                     throw armnn::Exception(std::string("Cannot transition from state [")
+                                            + GetProfilingStateName(expectedState)
+                                            +"] to [" + GetProfilingStateName(newState) + "]");
+                 }
+             } while (!m_State.compare_exchange_strong(expectedState, newState,
+                      std::memory_order::memory_order_relaxed));
+
+             break;
+         }
+         case ProfilingState::Active:
+         {
+             ProfilingState expectedState = m_State.load(std::memory_order::memory_order_relaxed);
+             do {
+                 if (!IsOneOfStates(expectedState, ProfilingState::WaitingForAck, ProfilingState::Active))
+                 {
+                     throw armnn::Exception(std::string("Cannot transition from state [")
+                                            + GetProfilingStateName(expectedState)
+                                            +"] to [" + GetProfilingStateName(newState) + "]");
+                 }
+             } while (!m_State.compare_exchange_strong(expectedState, newState,
+                      std::memory_order::memory_order_relaxed));
+
+             break;
+         }
+         default:
+             break;
+     }
+}
+
+} //namespace profiling
+
+} //namespace armnn
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