Delete LocApiBase and derived class on msgTask thread

Direct delete of the API obj on caller thread could result
in a race condition that caller still has close() or other
handling running at the same time the API object is being
or already deleted.

CRs-Fixed: 2275383

Change-Id: I5d3de204befec3c22c73cece8516e90800abbd35

2 files changed, 29 insertions, 3 deletions

diff --git a/core/ContextBase.h b/core/ContextBase.h
index 7c5ac17..4ad6cb1 100644
--- a/core/ContextBase.h
+++ b/core/ContextBase.h
@@ -124,7 +124,16 @@ public:
     ContextBase(const MsgTask* msgTask,
                 LOC_API_ADAPTER_EVENT_MASK_T exMask,
                 const char* libName);
-    inline virtual ~ContextBase() { delete mLocApi; delete mLBSProxy; }
+    inline virtual ~ContextBase() {
+        if (nullptr != mLocApi) {
+            mLocApi->destroy();
+            mLocApi = nullptr;
+        }
+        if (nullptr != mLBSProxy) {
+            delete mLBSProxy;
+            mLBSProxy = nullptr;
+        }
+    }
 
     inline const MsgTask* getMsgTask() { return mMsgTask; }
     inline LocApiBase* getLocApi() { return mLocApi; }
diff --git a/core/LocApiBase.h b/core/LocApiBase.h
index fc86eb3..b50a973 100644
--- a/core/LocApiBase.h
+++ b/core/LocApiBase.h
@@ -103,11 +103,11 @@ class LocApiBase {
     //it as a friend
     friend struct LocOpenMsg;
     friend struct LocCloseMsg;
+    friend struct LocKillMsg;
     friend class ContextBase;
     static MsgTask* mMsgTask;
     LocAdapterBase* mLocAdapters[MAX_ADAPTERS];
 
-
 protected:
     ContextBase *mContext;
     virtual enum loc_api_adapter_err
@@ -118,7 +118,12 @@ protected:
     LOC_API_ADAPTER_EVENT_MASK_T mMask;
     LocApiBase(LOC_API_ADAPTER_EVENT_MASK_T excludedMask,
                ContextBase* context = NULL);
-    inline virtual ~LocApiBase() { close(); }
+    inline virtual ~LocApiBase() {
+        if (nullptr != mMsgTask) {
+            mMsgTask->destroy();
+            mMsgTask = nullptr;
+        }
+    }
     bool isInSession();
     const LOC_API_ADAPTER_EVENT_MASK_T mExcludedMask;
     bool isMaster();
@@ -127,6 +132,18 @@ public:
     inline void sendMsg(const LocMsg* msg) const {
         mMsgTask->sendMsg(msg);
     }
+    inline void destroy() {
+        close();
+        struct LocKillMsg : public LocMsg {
+            LocApiBase* mLocApi;
+            inline LocKillMsg(LocApiBase* locApi) : LocMsg(), mLocApi(locApi) {}
+            inline virtual void proc() const {
+                delete mLocApi;
+            }
+        };
+        sendMsg(new LocKillMsg(this));
+    }
+
     void addAdapter(LocAdapterBase* adapter);
     void removeAdapter(LocAdapterBase* adapter);