make FairProgOptions calls thread safe

fairmq/options/FairMQProgOptions.h

@@ -19,6 +19,7 @@
 #include <unordered_map>
 #include <map>
 #include <set>
+#include <mutex>
 
 #include "FairProgOptions.h"
 #include "FairMQEventManager.h"
@@ -164,6 +165,8 @@ class FairMQProgOptions : public FairProgOptions , public FairMQEventManager
     template<typename T>
     int UpdateValue(const std::string& key, T val)
     {
+        std::unique_lock<std::mutex> lock(fConfigMutex);
+
         if (fVarMap.count(key))
         {
             // update variable map
@@ -204,6 +207,8 @@ class FairMQProgOptions : public FairProgOptions , public FairMQEventManager
     template <typename T, typename F>
     void Subscribe(const std::string& key, F&& func) const
     {
+        std::unique_lock<std::mutex> lock(fConfigMutex);
+
         static_assert(!std::is_same<T,const char*>::value || !std::is_same<T, char*>::value,
             "In template member FairMQProgOptions::Subscribe<T>(key,Lambda) the types const char* or char* for the calback signatures are not supported.");
 

fairmq/options/FairProgOptions.cxx

@@ -28,6 +28,7 @@ FairProgOptions::FairProgOptions() :
                         fConfigFileOptions("Configuration file options"),
                         fSeverityMap(),
                         fVisibleOptions("Visible options"),
+                        fConfigMutex(),
                         fVerbosityLevel("INFO"),
                         fUseConfigFile(false),
                         fConfigFile()
@@ -204,29 +205,7 @@ int FairProgOptions::ParseEnvironment(const function<string(string)>& environmen
     return 0;
 }
 
-// Given a key, convert the variable value to string
+int FairProgOptions::PrintHelp() const
-string FairProgOptions::GetStringValue(const string& key)
-{
-    string valueStr;
-    try
-    {
-        if (fVarMap.count(key))
-        {
-            valueStr=FairMQ::ConvertVariableValue<FairMQ::ToString>().Run(fVarMap.at(key));
-        }
-    }
-    catch(exception& e)
-    {
-        LOG(ERROR) << "Exception thrown for the key '" << key << "'";
-        LOG(ERROR) << e.what();
-    }
-
-    return valueStr;
-}
-
-/// //////////////////////////////////////////////////////////////////////////////////////////////////////
-/// Print/notify options
-int FairProgOptions::PrintHelp()  const
 {
     cout << fVisibleOptions << "\n";
     return 0;

fairmq/options/FairProgOptions.h

@@ -24,6 +24,7 @@
 #include <iostream>
 #include <fstream>
 #include <iterator>
+#include <mutex>
 #include <tuple>
 
 /*
@@ -77,6 +78,8 @@ class FairProgOptions
     template<typename T>
     T GetValue(const std::string& key) const
     {
+        std::unique_lock<std::mutex> lock(fConfigMutex);
+
         T val = T();
         try
         {
@@ -99,11 +102,32 @@ class FairProgOptions
         return val;
     }
 
-    // convert value to string that corresponds to the key
+    // Given a key, convert the variable value to string
-    std::string GetStringValue(const std::string& key);
+    std::string GetStringValue(const std::string& key)
+    {
+        std::unique_lock<std::mutex> lock(fConfigMutex);
+
+        std::string valueStr;
+        try
+        {
+            if (fVarMap.count(key))
+            {
+                valueStr = FairMQ::ConvertVariableValue<FairMQ::ToString>().Run(fVarMap.at(key));
+            }
+        }
+        catch (std::exception& e)
+        {
+            LOG(ERROR) << "Exception thrown for the key '" << key << "'";
+            LOG(ERROR) << e.what();
+        }
+
+        return valueStr;
+    }
 
     int Count(const std::string& key) const
     {
+        std::unique_lock<std::mutex> lock(fConfigMutex);
+
         return fVarMap.count(key);
     }
 
@@ -162,6 +186,8 @@ class FairProgOptions
     std::map<std::string, FairMQ::severity_level> fSeverityMap;
     po::options_description fVisibleOptions;
 
+    mutable std::mutex fConfigMutex;
+
     std::string fVerbosityLevel;
     bool fUseConfigFile;
     boost::filesystem::path fConfigFile;