TargetController suspension

src/DebugServers/GdbRsp/Exceptions/DebugSessionAborted.hpp

@@ -0,0 +1,26 @@
+#pragma once
+
+#include "src/Exceptions/Exception.hpp"
+
+namespace Bloom::DebugServers::Gdb::Exceptions
+{
+    /**
+     * The GDB server may abort a debug session with the client, if an internal error occurs. One circumstance where
+     * this can happen is when the TargetController is not able to service the debug session for whatever reason.
+     *
+     * See GdbRspDebugServer::serve() for handling code.
+     */
+    class DebugSessionAborted: public Bloom::Exceptions::Exception
+    {
+    public:
+        explicit DebugSessionAborted(const std::string& message): Bloom::Exceptions::Exception(message) {
+            this->message = message;
+        }
+
+        explicit DebugSessionAborted(const char* message): Bloom::Exceptions::Exception(message) {
+            this->message = std::string(message);
+        }
+
+        explicit DebugSessionAborted() = default;
+    };
+}

src/DebugServers/GdbRsp/GdbRspDebugServer.cpp

@@ -105,7 +105,19 @@ void GdbRspDebugServer::serve() {
     try {
         if (!this->clientConnection.has_value()) {
             Logger::info("Waiting for GDB RSP connection");
-            this->waitForConnection();
+
+            while (!this->clientConnection.has_value()) {
+                this->waitForConnection();
+            }
+
+            /*
+             * Before proceeding with a new debug session, we must ensure that the TargetController is able to
+             * service it.
+             */
+            if (!this->targetControllerConsole.isTargetControllerInService()) {
+                this->closeClientConnection();
+                throw DebugSessionAborted("TargetController not in service");
+            }
         }
 
         auto packets = this->clientConnection->readPackets();
@@ -121,12 +133,17 @@ void GdbRspDebugServer::serve() {
         return;
 
     } catch (const ClientCommunicationError& exception) {
-        Logger::error("GDB client communication error - " + exception.getMessage() + " - closing connection");
+        Logger::error("GDB RSP client communication error - " + exception.getMessage() + " - closing connection");
         this->closeClientConnection();
         return;
 
     } catch (const ClientNotSupported& exception) {
-        Logger::error("Invalid GDB client - " + exception.getMessage() + " - closing connection");
+        Logger::error("Invalid GDB RSP client - " + exception.getMessage() + " - closing connection");
+        this->closeClientConnection();
+        return;
+
+    } catch (const DebugSessionAborted& exception) {
+        Logger::warning("GDB debug session aborted - " + exception.getMessage());
         this->closeClientConnection();
         return;
 
@@ -163,13 +180,9 @@ void GdbRspDebugServer::waitForConnection() {
 
         this->clientConnection = Connection(this->interruptEventNotifier);
         this->clientConnection->accept(this->serverSocketFileDescriptor);
-
-        Logger::info("Accepted GDP RSP connection from " + this->clientConnection->getIpAddress());
         this->eventManager.triggerEvent(std::make_shared<Events::DebugSessionStarted>());
 
-    } else {
-        // This method should not return until a connection has been established (or an exception is thrown)
-        return this->waitForConnection();
+        Logger::info("Accepted GDP RSP connection from " + this->clientConnection->getIpAddress());
     }
 }
 

src/DebugToolDrivers/Microchip/AtmelICE/AtmelIce.hpp

@@ -69,7 +69,6 @@ namespace Bloom::DebugToolDrivers
 
         void close() override;
 
-
         Protocols::CmsisDap::Edbg::EdbgInterface& getEdbgInterface()  {
             return this->edbgInterface;
         }

src/DebugToolDrivers/Microchip/MplabSnap/MplabSnap.hpp

@@ -55,7 +55,6 @@ namespace Bloom::DebugToolDrivers
 
         void close() override;
 
-
         Protocols::CmsisDap::Edbg::EdbgInterface& getEdbgInterface()  {
             return this->edbgInterface;
         }

src/DebugToolDrivers/Microchip/PowerDebugger/PowerDebugger.hpp

@@ -55,7 +55,6 @@ namespace Bloom::DebugToolDrivers
 
         void close() override;
 
-
         Protocols::CmsisDap::Edbg::EdbgInterface& getEdbgInterface()  {
             return this->edbgInterface;
         }

src/EventManager/EventListener.cpp

@@ -15,7 +15,7 @@ void EventListener::clearAllCallbacks() {
 void EventListener::registerEvent(GenericEventPointer event) {
     auto eventName = event->getName();
     Logger::debug("Event \"" + eventName + "\" (" + std::to_string(event->id)
-    + ") registered for listener " + std::to_string(this->id));
+    + ") registered for listener " + this->name);
     auto queueLock = this->eventQueueByEventType.acquireLock();
     auto& eventQueueByType = this->eventQueueByEventType.getReference();
 
@@ -57,7 +57,7 @@ std::vector<GenericEventPointer> EventListener::getEvents() {
 
 void EventListener::dispatchEvent(GenericEventPointer event) {
     auto eventName = event->getName();
-    Logger::debug("Dispatching event " + eventName + ".");
+    Logger::debug("Dispatching event " + eventName + " (" + std::to_string(event->id) + ").");
     // Dispatch the event to all registered handlers
     auto mappingLock = this->eventTypeToCallbacksMapping.acquireLock();
     auto& callbacks = this->eventTypeToCallbacksMapping.getReference().find(eventName)->second;

src/EventManager/EventListener.hpp

@@ -141,6 +141,40 @@ namespace Bloom
             this->registeredEventTypes.getReference().insert(EventType::name);
         }
 
+        /**
+         * Clears all registered callbacks for a specific event type.
+         *
+         * @tparam EventType
+         */
+        template<class EventType>
+        void deregisterCallbacksForEventType() {
+            static_assert(
+                std::is_base_of<Events::Event, EventType>::value,
+                "EventType is not a derivation of Event"
+            );
+
+            {
+                auto mappingLock = this->eventTypeToCallbacksMapping.acquireLock();
+                auto& mapping = this->eventTypeToCallbacksMapping.getReference();
+
+                if (mapping.contains(EventType::name)) {
+                    mapping.at(EventType::name).clear();
+                }
+            }
+
+            {
+                auto registeredEventTypesLock = this->registeredEventTypes.acquireLock();
+                this->registeredEventTypes.getReference().erase(EventType::name);
+            }
+
+            auto queueLock = this->eventQueueByEventType.acquireLock();
+            auto& eventQueueByType = this->eventQueueByEventType.getReference();
+
+            if (eventQueueByType.contains(EventType::name)) {
+                eventQueueByType.erase(EventType::name);
+            }
+        }
+
         /**
          * Waits for an event (of type EventTypeA, EventTypeB or EventTypeC) to be dispatched to the listener.
          * Then returns the event object. If timeout is reached, an std::nullopt object will be returned.

src/EventManager/Events/Events.hpp

@@ -9,6 +9,8 @@
 #include "DebugSessionStarted.hpp"
 #include "DebugSessionFinished.hpp"
 #include "TargetControllerThreadStateChanged.hpp"
+#include "ReportTargetControllerState.hpp"
+#include "TargetControllerStateReported.hpp"
 #include "ShutdownTargetController.hpp"
 #include "TargetControllerErrorOccurred.hpp"
 #include "ShutdownApplication.hpp"
@@ -33,7 +35,7 @@
 #include "ProgramCounterSetOnTarget.hpp"
 #include "ExtractTargetDescriptor.hpp"
 #include "TargetDescriptorExtracted.hpp"
-#include "InsightStateChanged.hpp"
+#include "InsightThreadStateChanged.hpp"
 #include "RetrieveTargetPinStates.hpp"
 #include "TargetPinStatesRetrieved.hpp"
 #include "SetTargetPinState.hpp"

src/EventManager/Events/InsightThreadStateChanged.hpp

@@ -7,19 +7,17 @@
 
 namespace Bloom::Events
 {
-    class InsightStateChanged: public Event
+    class InsightThreadStateChanged: public Event
     {
     private:
         ThreadState state;
     public:
-        InsightStateChanged(ThreadState state): state(state) {
+        InsightThreadStateChanged(ThreadState state): state(state) {};
 
-        };
-
-        static inline const std::string name = "InsightStateChanged";
+        static inline const std::string name = "InsightThreadStateChanged";
 
         std::string getName() const override {
-            return InsightStateChanged::name;
+            return InsightThreadStateChanged::name;
         }
 
         ThreadState getState() const {

src/EventManager/Events/ReportTargetControllerState.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+
+#include "Event.hpp"
+
+namespace Bloom::Events
+{
+    class ReportTargetControllerState: public Event
+    {
+    public:
+        ReportTargetControllerState() {};
+
+        static inline const std::string name = "ReportTargetControllerState";
+
+        std::string getName() const override {
+            return ReportTargetControllerState::name;
+        }
+    };
+}

src/EventManager/Events/TargetControllerStateReported.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <string>
+
+#include "Event.hpp"
+#include "src/TargetController/TargetControllerState.hpp"
+
+namespace Bloom::Events
+{
+    class TargetControllerStateReported: public Event
+    {
+    public:
+        TargetControllerState state;
+
+        TargetControllerStateReported(TargetControllerState state): state(state) {};
+
+        static inline const std::string name = "TargetControllerStateReported";
+
+        std::string getName() const override {
+            return TargetControllerStateReported::name;
+        }
+    };
+}

src/TargetController/TargetController.cpp

@@ -5,6 +5,7 @@
 #include "TargetController.hpp"
 #include "src/Exceptions/InvalidConfig.hpp"
 #include "src/Exceptions/TargetControllerStartupFailure.hpp"
+#include "src/Exceptions/DeviceCommunicationFailure.hpp"
 #include "src/Application.hpp"
 
 using namespace Bloom;
@@ -19,9 +20,27 @@ void TargetController::run() {
         this->setThreadStateAndEmitEvent(ThreadState::READY);
         Logger::debug("TargetController ready and waiting for events.");
 
-        while (this->getState() == ThreadState::READY) {
-            this->fireTargetEvents();
-            this->eventListener->waitAndDispatch(60);
+        while (this->getThreadState() == ThreadState::READY) {
+            try {
+                if (this->state == TargetControllerState::ACTIVE) {
+                    this->fireTargetEvents();
+                }
+
+                this->eventListener->waitAndDispatch(60);
+
+            } catch (const DeviceCommunicationFailure& exception) {
+                /*
+                 * Upon a device communication failure, we assume Bloom has lost control of the debug tool. This could
+                 * be the result of the user disconnecting the debug tool, or issuing a soft reset.
+                 * The soft reset could have been issued via another application, without the user's knowledge.
+                 * See https://github.com/navnavnav/Bloom/issues/3 for more on that.
+                 *
+                 * The TC will go into a suspended state and the DebugServer should terminate any active debug
+                 * session. When the user attempts to start another debug session, we will try to re-connect to the
+                 * debug tool.
+                 */
+                this->suspend();
+            }
         }
 
     } catch (const TargetControllerStartupFailure& exception) {
@@ -50,70 +69,11 @@ void TargetController::startup() {
     // Install Bloom's udev rules if not already installed
     this->checkUdevRules();
 
-    auto debugToolName = this->environmentConfig.debugToolName;
-    auto targetName = this->environmentConfig.targetConfig.name;
-    auto supportedDebugTools = TargetController::getSupportedDebugTools();
-    auto supportedTargets = TargetController::getSupportedTargets();
-
-    if (!supportedDebugTools.contains(debugToolName)) {
-        throw Exceptions::InvalidConfig(
-            "Debug tool name (\"" + debugToolName + "\") not recognised. Please check your configuration!"
-        );
-    }
-
-    if (!supportedTargets.contains(targetName)) {
-        throw Exceptions::InvalidConfig(
-            "Target name (\"" + targetName + "\") not recognised. Please check your configuration!"
-        );
-    }
-
-    // Initiate debug tool and target
-    this->setDebugTool(std::move(supportedDebugTools.at(debugToolName)()));
-    this->setTarget(supportedTargets.at(targetName)());
-
-    Logger::info("Connecting to debug tool");
-    this->debugTool->init();
-
-    Logger::info("Debug tool connected");
-    Logger::info("Debug tool name: " + this->debugTool->getName());
-    Logger::info("Debug tool serial: " + this->debugTool->getSerialNumber());
-
-    if (!this->target->isDebugToolSupported(this->debugTool.get())) {
-        throw Exceptions::InvalidConfig(
-            "Debug tool (\"" + this->debugTool->getName() + "\") not supported " +
-                "by target (\"" + this->target->getName() + "\")."
-        );
-    }
-
-    this->target->setDebugTool(this->debugTool.get());
-    this->target->preActivationConfigure(this->environmentConfig.targetConfig);
-
-    Logger::info("Activating target");
-    this->target->activate();
-    Logger::info("Target activated");
-    this->target->postActivationConfigure();
-
-    while (this->target->supportsPromotion()) {
-        auto promotedTarget = this->target->promote();
-
-        if (promotedTarget == nullptr
-            || std::type_index(typeid(*promotedTarget)) == std::type_index(typeid(*this->target))
-        ) {
-            break;
-        }
-
-        this->target.reset(promotedTarget.release());
-        this->target->postPromotionConfigure();
-    }
-
-    Logger::info("Target ID: " + this->target->getHumanReadableId());
-    Logger::info("Target name: " + this->target->getName());
-
-    if (this->target->getState() == TargetState::STOPPED) {
-        this->target->run();
-    }
-
     // Register event handlers
+    this->eventListener->registerCallbackForEventType<Events::ReportTargetControllerState>(
+        std::bind(&TargetController::onStateReportRequest, this, std::placeholders::_1)
+    );
+
     this->eventListener->registerCallbackForEventType<Events::ShutdownTargetController>(
         std::bind(&TargetController::onShutdownTargetControllerEvent, this, std::placeholders::_1)
     );
@@ -122,6 +82,100 @@ void TargetController::startup() {
         std::bind(&TargetController::onDebugSessionStartedEvent, this, std::placeholders::_1)
     );
 
+    this->resume();
+}
+
+void TargetController::checkUdevRules() {
+    auto bloomRulesPath = std::string("/etc/udev/rules.d/99-bloom.rules");
+    auto latestBloomRulesPath = Application::getResourcesDirPath() + "/UDevRules/99-bloom.rules";
+
+    if (!std::filesystem::exists(bloomRulesPath)) {
+        Logger::warning("Bloom udev rules missing - attempting installation");
+
+        // We can only install them if we're running as root
+        if (!Application::isRunningAsRoot()) {
+            Logger::error("Bloom udev rules missing - cannot install udev rules without root privileges.\n"
+                "Running Bloom once with root privileges will allow it to automatically install the udev rules."
+                " Alternatively, instructions on manually installing the udev rules can be found "
+                "here: https://bloom.oscillate.io/docs/getting-started\nBloom may fail to connect to some debug tools "
+                "until this is resolved.");
+            return;
+        }
+
+        if (!std::filesystem::exists(latestBloomRulesPath)) {
+            // This shouldn't happen, but it can if someone has been messing with the installation files
+            Logger::error("Unable to install Bloom udev rules - \"" + latestBloomRulesPath + "\" does not exist.");
+            return;
+        }
+
+        std::filesystem::copy(latestBloomRulesPath, bloomRulesPath);
+        Logger::warning("Bloom udev rules installed - a reconnect of the debug tool may be required "
+            "before the new udev rules come into effect.");
+    }
+}
+
+void TargetController::shutdown() {
+    if (this->getThreadState() == ThreadState::STOPPED) {
+        return;
+    }
+
+    try {
+        Logger::info("Shutting down TargetController");
+        this->eventManager.deregisterListener(this->eventListener->getId());
+        this->releaseResources();
+
+    } catch (const std::exception& exception) {
+        Logger::error("Failed to properly shutdown TargetController. Error: " + std::string(exception.what()));
+    }
+
+    this->setThreadStateAndEmitEvent(ThreadState::STOPPED);
+}
+
+void TargetController::suspend() {
+    if (this->getThreadState() != ThreadState::READY) {
+        return;
+    }
+
+    Logger::debug("Suspending TargetController");
+
+    try {
+        this->releaseResources();
+
+    } catch (const std::exception& exception) {
+        Logger::error("Failed to release connected debug tool and target resources. Error: "
+            + std::string(exception.what()));
+    }
+
+    this->eventListener->deregisterCallbacksForEventType<Events::DebugSessionFinished>();
+    this->eventListener->deregisterCallbacksForEventType<Events::ExtractTargetDescriptor>();
+    this->eventListener->deregisterCallbacksForEventType<Events::StopTargetExecution>();
+    this->eventListener->deregisterCallbacksForEventType<Events::StepTargetExecution>();
+    this->eventListener->deregisterCallbacksForEventType<Events::ResumeTargetExecution>();
+    this->eventListener->deregisterCallbacksForEventType<Events::RetrieveRegistersFromTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::WriteRegistersToTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::RetrieveMemoryFromTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::WriteMemoryToTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::SetBreakpointOnTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::RemoveBreakpointOnTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::SetProgramCounterOnTarget>();
+    this->eventListener->deregisterCallbacksForEventType<Events::InsightThreadStateChanged>();
+    this->eventListener->deregisterCallbacksForEventType<Events::RetrieveTargetPinStates>();
+    this->eventListener->deregisterCallbacksForEventType<Events::SetTargetPinState>();
+
+    this->lastTargetState = TargetState::UNKNOWN;
+    this->cachedTargetDescriptor = std::nullopt;
+
+    this->state = TargetControllerState::SUSPENDED;
+    this->eventManager.triggerEvent(
+        std::make_shared<TargetControllerStateReported>(this->state)
+    );
+
+    Logger::debug("TargetController suspended");
+}
+
+void TargetController::resume() {
+    this->acquireResources();
+
     this->eventListener->registerCallbackForEventType<Events::DebugSessionFinished>(
         std::bind(&TargetController::onDebugSessionFinishedEvent, this, std::placeholders::_1)
     );
@@ -170,7 +224,7 @@ void TargetController::startup() {
         std::bind(&TargetController::onSetProgramCounterEvent, this, std::placeholders::_1)
     );
 
-    this->eventListener->registerCallbackForEventType<Events::InsightStateChanged>(
+    this->eventListener->registerCallbackForEventType<Events::InsightThreadStateChanged>(
         std::bind(&TargetController::onInsightStateChangedEvent, this, std::placeholders::_1)
     );
 
@@ -181,68 +235,101 @@ void TargetController::startup() {
     this->eventListener->registerCallbackForEventType<Events::SetTargetPinState>(
         std::bind(&TargetController::onSetPinStateEvent, this, std::placeholders::_1)
     );
-}
 
-void TargetController::checkUdevRules() {
-    auto bloomRulesPath = std::string("/etc/udev/rules.d/99-bloom.rules");
-    auto latestBloomRulesPath = Application::getResourcesDirPath() + "/UDevRules/99-bloom.rules";
+    Logger::debug("TC resumed");
+    this->state = TargetControllerState::ACTIVE;
+    this->eventManager.triggerEvent(
+        std::make_shared<TargetControllerStateReported>(this->state)
+    );
 
-    if (!std::filesystem::exists(bloomRulesPath)) {
-        Logger::warning("Bloom udev rules missing - attempting installation");
-
-        // We can only install them if we're running as root
-        if (!Application::isRunningAsRoot()) {
-            Logger::error("Bloom udev rules missing - cannot install udev rules without root privileges.\n"
-                "Running Bloom once with root privileges will allow it to automatically install the udev rules."
-                " Alternatively, instructions on manually installing the udev rules can be found "
-                "here: https://bloom.oscillate.io/docs/getting-started\nBloom may fail to connect to some debug tools "
-                "until this is resolved.");
-            return;
-        }
-
-        if (!std::filesystem::exists(latestBloomRulesPath)) {
-            // This shouldn't happen, but it can if someone has been messing with the installation files
-            Logger::error("Unable to install Bloom udev rules - \"" + latestBloomRulesPath + "\" does not exist.");
-            return;
-        }
-
-        std::filesystem::copy(latestBloomRulesPath, bloomRulesPath);
-        Logger::warning("Bloom udev rules installed - a reconnect of the debug tool may be required "
-            "before the new udev rules come into effect.");
+    if (this->target->getState() != TargetState::RUNNING) {
+        this->target->run();
     }
 }
 
-void TargetController::shutdown() {
-    if (this->getState() == ThreadState::STOPPED) {
-        return;
+void TargetController::acquireResources() {
+    auto debugToolName = this->environmentConfig.debugToolConfig.name;
+    auto targetName = this->environmentConfig.targetConfig.name;
+
+    auto supportedDebugTools = TargetController::getSupportedDebugTools();
+    auto supportedTargets = TargetController::getSupportedTargets();
+
+    if (!supportedDebugTools.contains(debugToolName)) {
+        throw Exceptions::InvalidConfig(
+            "Debug tool name (\"" + debugToolName + "\") not recognised. Please check your configuration!"
+        );
     }
 
-    try {
-        Logger::info("Shutting down TargetController");
-        //this->targetControllerEventListener->clearAllCallbacks();
-        this->eventManager.deregisterListener(this->eventListener->getId());
-        auto target = this->getTarget();
-        auto debugTool = this->getDebugTool();
+    if (!supportedTargets.contains(targetName)) {
+        throw Exceptions::InvalidConfig(
+            "Target name (\"" + targetName + "\") not recognised. Please check your configuration!"
+        );
+    }
 
-        if (debugTool != nullptr && debugTool->isInitialised()) {
-            if (target != nullptr) {
-                /*
-                 * We call deactivate() without checking if the target is activated. This will address any cases
-                 * where a target is only partially activated (where the call to activate() failed).
-                 */
-                Logger::info("Deactivating target");
-                target->deactivate();
-            }
+    // Initiate debug tool and target
+    this->debugTool = supportedDebugTools.at(debugToolName)();
 
-            Logger::info("Closing debug tool");
-            debugTool->close();
+    Logger::info("Connecting to debug tool");
+    this->debugTool->init();
+
+    Logger::info("Debug tool connected");
+    Logger::info("Debug tool name: " + this->debugTool->getName());
+    Logger::info("Debug tool serial: " + this->debugTool->getSerialNumber());
+
+    this->target = supportedTargets.at(targetName)();
+
+    if (!this->target->isDebugToolSupported(this->debugTool.get())) {
+        throw Exceptions::InvalidConfig(
+            "Debug tool (\"" + this->debugTool->getName() + "\") not supported " +
+                "by target (\"" + this->target->getName() + "\")."
+        );
+    }
+
+    this->target->setDebugTool(this->debugTool.get());
+    this->target->preActivationConfigure(this->environmentConfig.targetConfig);
+
+    Logger::info("Activating target");
+    this->target->activate();
+    Logger::info("Target activated");
+    this->target->postActivationConfigure();
+
+    while (this->target->supportsPromotion()) {
+        auto promotedTarget = this->target->promote();
+
+        if (promotedTarget == nullptr
+            || std::type_index(typeid(*promotedTarget)) == std::type_index(typeid(*this->target))
+            ) {
+            break;
         }
 
-    } catch (const std::exception& exception) {
-        Logger::error("Failed to properly shutdown TargetController. Error: " + std::string(exception.what()));
+        this->target.reset(promotedTarget.release());
+        this->target->postPromotionConfigure();
     }
 
-    this->setStateAndEmitEvent(ThreadState::STOPPED);
+    Logger::info("Target ID: " + this->target->getHumanReadableId());
+    Logger::info("Target name: " + this->target->getName());
+}
+
+void TargetController::releaseResources() {
+    auto target = this->getTarget();
+    auto debugTool = this->getDebugTool();
+
+    if (debugTool != nullptr && debugTool->isInitialised()) {
+        if (target != nullptr) {
+            /*
+             * We call deactivate() without checking if the target is activated. This will address any cases
+             * where a target is only partially activated (where the call to activate() failed).
+             */
+            Logger::info("Deactivating target");
+            target->deactivate();
+        }
+
+        Logger::info("Closing debug tool");
+        debugTool->close();
+    }
+
+    this->debugTool.reset();
+    this->target.reset();
 }
 
 void TargetController::fireTargetEvents() {
@@ -276,6 +363,38 @@ void TargetController::onShutdownTargetControllerEvent(EventPointer<Events::Shut
     this->shutdown();
 }
 
+void TargetController::onStateReportRequest(EventPointer<Events::ReportTargetControllerState> event) {
+    auto stateEvent = std::make_shared<TargetControllerStateReported>(this->state);
+    stateEvent->correlationId = event->id;
+    this->eventManager.triggerEvent(stateEvent);
+}
+
+void TargetController::onDebugSessionStartedEvent(EventPointer<Events::DebugSessionStarted>) {
+    if (this->state == TargetControllerState::SUSPENDED) {
+        Logger::debug("Waking TargetController");
+
+        this->resume();
+        this->fireTargetEvents();
+    }
+
+    this->target->reset();
+
+    if (this->target->getState() != TargetState::STOPPED) {
+        this->target->stop();
+    }
+}
+
+void TargetController::onDebugSessionFinishedEvent(EventPointer<DebugSessionFinished>) {
+    if (this->target->getState() != TargetState::RUNNING) {
+        this->target->run();
+        this->fireTargetEvents();
+    }
+
+    if (this->environmentConfig.debugToolConfig.releasePostDebugSession) {
+        this->suspend();
+    }
+}
+
 void TargetController::onExtractTargetDescriptor(EventPointer<Events::ExtractTargetDescriptor> event) {
     if (!this->cachedTargetDescriptor.has_value()) {
         this->cachedTargetDescriptor = this->target->getDescriptor();
@@ -444,20 +563,6 @@ void TargetController::onRemoveBreakpointEvent(EventPointer<Events::RemoveBreakp
     }
 }
 
-void TargetController::onDebugSessionStartedEvent(EventPointer<Events::DebugSessionStarted>) {
-    this->target->reset();
-
-    if (this->target->getState() != TargetState::STOPPED) {
-        this->target->stop();
-    }
-}
-
-void TargetController::onDebugSessionFinishedEvent(EventPointer<DebugSessionFinished>) {
-    if (this->target->getState() != TargetState::RUNNING) {
-        this->target->run();
-    }
-}
-
 void TargetController::onSetProgramCounterEvent(EventPointer<Events::SetProgramCounterOnTarget> event) {
     try {
         if (this->target->getState() != TargetState::STOPPED) {

src/TargetController/TargetController.hpp

@@ -8,14 +8,18 @@
 #include <QJsonArray>
 
 #include "src/Helpers/Thread.hpp"
-#include "src/Logger/Logger.hpp"
-#include "src/EventManager/EventListener.hpp"
+#include "TargetControllerState.hpp"
+
 #include "src/DebugToolDrivers/DebugTools.hpp"
 #include "src/Targets/Target.hpp"
 #include "src/Targets/Targets.hpp"
+
 #include "src/EventManager/EventManager.hpp"
+#include "src/EventManager/EventListener.hpp"
 #include "src/EventManager/Events/Events.hpp"
 
+#include "src/Logger/Logger.hpp"
+
 namespace Bloom
 {
     /**
@@ -30,6 +34,11 @@ namespace Bloom
     class TargetController: public Thread
     {
     private:
+        /**
+         * The TC starts off in a suspended state. TargetController::resume() is invoked from the startup routine.
+         */
+        TargetControllerState state = TargetControllerState::SUSPENDED;
+
         ApplicationConfig applicationConfig;
         EnvironmentConfig environmentConfig;
 
@@ -138,14 +147,6 @@ namespace Bloom
             return mapping;
         }
 
-        void setDebugTool(std::unique_ptr<DebugTool> debugTool) {
-            this->debugTool = std::move(debugTool);
-        }
-
-        void setTarget(std::unique_ptr<Targets::Target> target) {
-            this->target = std::move(target);
-        }
-
         Targets::Target* getTarget() {
             return this->target.get();
         }
@@ -186,6 +187,15 @@ namespace Bloom
          */
         void shutdown();
 
+
+        void suspend();
+
+        void resume();
+
+        void acquireResources();
+
+        void releaseResources();
+
         /**
          * Should fire any events queued on the target.
          */
@@ -215,6 +225,13 @@ namespace Bloom
          */
         void run();
 
+        /**
+         * Reports the current state of the TargetController.
+         *
+         * @param event
+         */
+        void onStateReportRequest(Events::EventPointer<Events::ReportTargetControllerState> event);
+
         /**
          * Obtains a TargetDescriptor from the target and includes it in a TargetDescriptorExtracted event.
          *
@@ -322,7 +339,7 @@ namespace Bloom
          *
          * @param event
          */
-        void onInsightStateChangedEvent(Events::EventPointer<Events::InsightStateChanged> event);
+        void onInsightStateChangedEvent(Events::EventPointer<Events::InsightThreadStateChanged> event);
 
         /**
          * Will attempt to obtain the pin states from the target. Will emit a TargetPinStatesRetrieved event on success.

src/TargetController/TargetControllerConsole.cpp

@@ -9,6 +9,33 @@ using namespace Bloom::Targets;
 using namespace Bloom::Events;
 using namespace Bloom::Exceptions;
 
+TargetControllerState TargetControllerConsole::getTargetControllerState() {
+    auto getStateEvent = std::make_shared<Events::ReportTargetControllerState>();
+    this->eventManager.triggerEvent(getStateEvent);
+    auto responseEvent = this->eventListener.waitForEvent<
+        Events::TargetControllerStateReported,
+        Events::TargetControllerErrorOccurred
+    >(this->defaultTimeout, getStateEvent->id);
+
+    if (!responseEvent.has_value()
+        || !std::holds_alternative<EventPointer<Events::TargetControllerStateReported>>(responseEvent.value())
+        ) {
+        throw Exception("Unexpected response from TargetController");
+    }
+
+    auto stateReportedEvent = std::get<EventPointer<Events::TargetControllerStateReported>>(responseEvent.value());
+    return stateReportedEvent->state;
+}
+
+bool TargetControllerConsole::isTargetControllerInService() noexcept {
+    try {
+        return this->getTargetControllerState() == TargetControllerState::ACTIVE;
+
+    } catch (const std::runtime_error&) {
+        return false;
+    }
+}
+
 Targets::TargetDescriptor TargetControllerConsole::getTargetDescriptor() {
     auto extractEvent = std::make_shared<Events::ExtractTargetDescriptor>();
     this->eventManager.triggerEvent(extractEvent);
@@ -217,4 +244,4 @@ void TargetControllerConsole::setPinState(int variantId, TargetPinDescriptor pin
     updateEvent->pinState = pinState;
 
     this->eventManager.triggerEvent(updateEvent);
-}
+}

src/TargetController/TargetControllerConsole.hpp

@@ -3,6 +3,8 @@
 #include <cstdint>
 #include <optional>
 
+#include "TargetControllerState.hpp"
+
 #include "src/EventManager/EventListener.hpp"
 #include "src/EventManager/EventManager.hpp"
 
@@ -35,6 +37,10 @@ namespace Bloom
             this->defaultTimeout = timeout;
         }
 
+        TargetControllerState getTargetControllerState();
+
+        bool isTargetControllerInService() noexcept;
+
         /**
          * Requests the TargetDescriptor from the TargetController
          *

src/TargetController/TargetControllerState.hpp

@@ -0,0 +1,10 @@
+#pragma once
+
+namespace Bloom
+{
+    enum class TargetControllerState: int
+    {
+        ACTIVE,
+        SUSPENDED,
+    };
+}

src/Targets/TargetDescriptor.hpp

@@ -17,3 +17,4 @@ namespace Bloom::Targets
     };
 }
 
+Q_DECLARE_METATYPE(Bloom::Targets::TargetDescriptor)