From 7d55341fded7b88f528b62a5527f9df8bc3259d8 Mon Sep 17 00:00:00 2001
From: Tatsuhiro Tsujikawa <tatsuhiro.t@gmail.com>
Date: Thu, 2 May 2013 12:44:55 +0900
Subject: [PATCH] Fix event polling not working with no downloads but
 keepRunning_ is true

---
 src/KeepRunningCommand.cc | 60 +++++++++++++++++++++++++++++++++++++++
 src/KeepRunningCommand.h  | 57 +++++++++++++++++++++++++++++++++++++
 src/Makefile.am           |  3 +-
 src/RequestGroupMan.h     |  5 ++++
 src/aria2api.cc           |  9 ++++++
 5 files changed, 133 insertions(+), 1 deletion(-)
 create mode 100644 src/KeepRunningCommand.cc
 create mode 100644 src/KeepRunningCommand.h

diff --git a/src/KeepRunningCommand.cc b/src/KeepRunningCommand.cc
new file mode 100644
index 00000000..f917d5e1
--- /dev/null
+++ b/src/KeepRunningCommand.cc
@@ -0,0 +1,60 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "KeepRunningCommand.h"
+#include "DownloadEngine.h"
+#include "RequestGroupMan.h"
+
+namespace aria2 {
+
+KeepRunningCommand::KeepRunningCommand(cuid_t cuid, DownloadEngine* e)
+  : Command(cuid),
+    e_(e)
+{
+  setStatusRealtime();
+}
+
+KeepRunningCommand::~KeepRunningCommand() {}
+
+bool KeepRunningCommand::execute()
+{
+  if(!e_->getRequestGroupMan()->getKeepRunning() ||
+     e_->isHaltRequested()) {
+    return true;
+  }
+  e_->addCommand(this);
+  return false;
+}
+
+} // namespace aria2
diff --git a/src/KeepRunningCommand.h b/src/KeepRunningCommand.h
new file mode 100644
index 00000000..9be030cb
--- /dev/null
+++ b/src/KeepRunningCommand.h
@@ -0,0 +1,57 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2013 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#ifndef KEEP_RUNNING_COMMAND_H
+#define KEEP_RUNNING_COMMAND_H
+
+#include "Command.h"
+
+namespace aria2 {
+
+class DownloadEngine;
+
+// This object does nothing but it is added to DownloadEngine command
+// queue (not routine one), and keeps event polling work.
+class KeepRunningCommand : public Command {
+public:
+  KeepRunningCommand(cuid_t cuid, DownloadEngine* e);
+  virtual ~KeepRunningCommand();
+  virtual bool execute();
+private:
+  DownloadEngine* e_;
+};
+
+} // namespace aria2
+
+#endif // KEEP_RUNNING_COMMAND_H
diff --git a/src/Makefile.am b/src/Makefile.am
index 59212bb6..80e755cf 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -639,7 +639,8 @@ DISTCLEANFILES = $(pkgconfig_DATA)
 
 lib_LTLIBRARIES = libaria2.la
 libaria2_la_SOURCES = $(SRCS) \
-	aria2api.cc aria2api.h
+	aria2api.cc aria2api.h \
+	KeepRunningCommand.cc KeepRunningCommand.h
 libaria2_la_LIBADD = @WSLAY_LIBS@
 
 LDADD = libaria2.la @LIBINTL@ @ALLOCA@ #-lprofiler
diff --git a/src/RequestGroupMan.h b/src/RequestGroupMan.h
index debb2573..186ed379 100644
--- a/src/RequestGroupMan.h
+++ b/src/RequestGroupMan.h
@@ -341,6 +341,11 @@ public:
   {
     keepRunning_ = flag;
   }
+
+  bool getKeepRunning() const
+  {
+    return keepRunning_;
+  }
 };
 
 } // namespace aria2
diff --git a/src/aria2api.cc b/src/aria2api.cc
index c9474a8b..dcf5a007 100644
--- a/src/aria2api.cc
+++ b/src/aria2api.cc
@@ -57,6 +57,7 @@
 #include "DownloadContext.h"
 #include "RpcMethodImpl.h"
 #include "console.h"
+#include "KeepRunningCommand.h"
 
 namespace aria2 {
 
@@ -105,6 +106,11 @@ Session* sessionNew(const KeyVals& options)
       delete session;
       session = 0;
     }
+    const SharedHandle<DownloadEngine>& e =
+      session->context->reqinfo->getDownloadEngine();
+    // Add command to make aria2 keep event polling if
+    // sessionConfigSetKeepRunning is set to true.
+    e->addCommand(new KeepRunningCommand(e->newCUID(), e.get()));
   } else {
     delete session;
     session = 0;
@@ -142,6 +148,9 @@ int shutdown(Session* session, bool force)
   } else {
     e->requestHalt();
   }
+  // Skip next polling timeout. This avoids 1 second delay when there
+  // is no Command other than KeepRunningCommand in the queue.
+  e->setNoWait(true);
   return 0;
 }