Create a scheduler thread for lightweight tasks

Author: gavinandresen

src/bitcoind.cpp

@@ -8,6 +8,7 @@
 #include "init.h"
 #include "main.h"
 #include "noui.h"
+#include "scheduler.h"
 #include "util.h"
 
 #include <boost/algorithm/string/predicate.hpp>
@@ -55,6 +56,7 @@ void WaitForShutdown(boost::thread_group* threadGroup)
 bool AppInit(int argc, char* argv[])
 {
     boost::thread_group threadGroup;
+    CScheduler scheduler;
 
     bool fRet = false;
 
@@ -142,7 +144,7 @@ bool AppInit(int argc, char* argv[])
 #endif
         SoftSetBoolArg("-server", true);
 
-        fRet = AppInit2(threadGroup);
+        fRet = AppInit2(threadGroup, scheduler);
     }
     catch (const std::exception& e) {
         PrintExceptionContinue(&e, "AppInit()");

src/init.cpp

@@ -19,6 +19,7 @@
 #include "net.h"
 #include "rpcserver.h"
 #include "script/standard.h"
+#include "scheduler.h"
 #include "txdb.h"
 #include "ui_interface.h"
 #include "util.h"
@@ -564,7 +565,7 @@ bool InitSanityCheck(void)
 /** Initialize bitcoin.
  *  @pre Parameters should be parsed and config file should be read.
  */
-bool AppInit2(boost::thread_group& threadGroup)
+bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 {
     // ********************************************************* Step 1: setup
 #ifdef _MSC_VER
@@ -890,6 +891,10 @@ bool AppInit2(boost::thread_group& threadGroup)
             threadGroup.create_thread(&ThreadScriptCheck);
     }
 
+    // Start the lightweight task scheduler thread
+    CScheduler::Function serviceLoop = boost::bind(&CScheduler::serviceQueue, &scheduler);
+    threadGroup.create_thread(boost::bind(&TraceThread<CScheduler::Function>, "scheduler", serviceLoop));
+
     /* Start the RPC server already.  It will be started in "warmup" mode
      * and not really process calls already (but it will signify connections
      * that the server is there and will be ready later).  Warmup mode will

src/init.h

@@ -8,6 +8,7 @@
 
 #include <string>
 
+class CScheduler;
 class CWallet;
 
 namespace boost
@@ -20,7 +21,7 @@ extern CWallet* pwalletMain;
 void StartShutdown();
 bool ShutdownRequested();
 void Shutdown();
-bool AppInit2(boost::thread_group& threadGroup);
+bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler);
 
 /** The help message mode determines what help message to show */
 enum HelpMessageMode {

src/qt/bitcoin.cpp

@@ -26,6 +26,7 @@
 #include "init.h"
 #include "main.h"
 #include "rpcserver.h"
+#include "scheduler.h"
 #include "ui_interface.h"
 #include "util.h"
 
@@ -178,6 +179,7 @@ public slots:
 
 private:
     boost::thread_group threadGroup;
+    CScheduler scheduler;
 
     /// Pass fatal exception message to UI thread
     void handleRunawayException(const std::exception *e);
@@ -258,7 +260,7 @@ void BitcoinCore::initialize()
     try
     {
         qDebug() << __func__ << ": Running AppInit2 in thread";
-        int rv = AppInit2(threadGroup);
+        int rv = AppInit2(threadGroup, scheduler);
         if(rv)
         {
             /* Start a dummy RPC thread if no RPC thread is active yet