From: Leandro Lucarella <llucax@gmail.com>
Date: Thu, 23 Oct 2003 02:59:19 +0000 (+0000)
Subject: Se agregan un par de mutex porque el server se muere con segmentation fault
X-Git-Tag: svn_import~376
X-Git-Url: https://git.llucax.com/z.facultad/75.42/plaqui.git/commitdiff_plain/751302dd67ffdeb0dfe72c4d2a7a2d58303cf5f3?hp=ab9300aaf1217f0c3b45dd5f1f1fdc1c5e5bd1be

Se agregan un par de mutex porque el server se muere con segmentation fault
cuando recibe muchas conexiones simultaneas. Tambien se agrega un limite a las
conexiones pendientes en el listen(). Con todo esto se sigue colgando.
---

diff --git a/Server/include/plaqui/server/runnable.h b/Server/include/plaqui/server/runnable.h
index 7896090..cc3bb0e 100644
--- a/Server/include/plaqui/server/runnable.h
+++ b/Server/include/plaqui/server/runnable.h
@@ -64,6 +64,12 @@ namespace Server {
 			 */
 			bool stop;
 
+			/**
+			 * Exclusión mutua.
+			 * Recurso usado para recibir la exclusividad sobre un recurso.
+			 */
+			Glib::Mutex mutex;
+
 		// Métodos.
 
 		private:
diff --git a/Server/include/plaqui/server/tcpserver.h b/Server/include/plaqui/server/tcpserver.h
index b3ecfa6..0290629 100644
--- a/Server/include/plaqui/server/tcpserver.h
+++ b/Server/include/plaqui/server/tcpserver.h
@@ -47,6 +47,9 @@ namespace Server {
 
 		private:
 
+			/// Cantidad máxima de conexiones pendientes.
+			static const unsigned MAX_PENDING_CONNECTIONS;
+
 			/// Lista de conexiones de control.
 			typedef std::list<Connection*> ConnectionList;
 
diff --git a/Server/src/runnable.cpp b/Server/src/runnable.cpp
index 7fd4105..cb3ba6f 100644
--- a/Server/src/runnable.cpp
+++ b/Server/src/runnable.cpp
@@ -61,10 +61,6 @@ void PlaQui::Server::Runnable::run(bool detach) {
 #endif // DEBUG
 	// Si vamos a correr la tarea en un thread.
 	if (detach) {
-		// Nos aseguramos de tener threads.
-		if (!Glib::thread_supported()) {
-			Glib::thread_init();
-		}
 		// Corremos el thread en una funcion estática para poder destruirlo al
 		// finalizar, pasandole el puntero al objeto.
 		thread = Glib::Thread::create(
@@ -81,7 +77,6 @@ void PlaQui::Server::Runnable::finish(bool attach) {
 #ifdef DEBUG
 	std::cerr << __FILE__ << ": finish(attach = " << attach << ")" << std::endl;
 #endif // DEBUG
-	// TODO - necesita un mutex?
 	stop = true;
 	if (attach) {
 		thread->join();
diff --git a/Server/src/tcpserver.cpp b/Server/src/tcpserver.cpp
index 4131224..a9ce030 100644
--- a/Server/src/tcpserver.cpp
+++ b/Server/src/tcpserver.cpp
@@ -31,6 +31,8 @@
 #	include <iostream>
 #endif // DEBUG
 
+const unsigned PlaQui::Server::TCPServer::MAX_PENDING_CONNECTIONS = 5;
+
 PlaQui::Server::TCPServer::~TCPServer(void) {
 #ifdef DEBUG
 	std::cerr << __FILE__ <<  ": destructor." << std::endl;
@@ -47,7 +49,7 @@ PlaQui::Server::TCPServer::TCPServer(int port):
 	std::cerr << __FILE__ <<  ": escuchando en " << socket.localhost()
 		<< ":" << socket.localport() << "." << std::endl;
 #endif // DEBUG
-	socket.listen();
+	socket.listen(MAX_PENDING_CONNECTIONS);
 #ifdef DEBUG
 	std::cerr << __FILE__ <<  ": [despues de listen()] escuchando en "
 		<< socket.localhost() << ":" << socket.localport() << "." << std::endl;
@@ -60,7 +62,7 @@ void PlaQui::Server::TCPServer::on_connection_finished(
 	std::cerr << __FILE__ <<  ": on_connection_finished(connection = "
 		<< connection << ")" << std::endl;
 #endif // DEBUG
-	// TODO: poner lock.
+	mutex.lock();
 	connections.remove(connection);
 #ifdef DEBUG
 	std::cerr << __FILE__ <<  ": lista de conexiones" << std::endl;
@@ -69,33 +71,32 @@ void PlaQui::Server::TCPServer::on_connection_finished(
 		std::cerr << "\t " << *i << std::endl;
 	}
 #endif // DEBUG
-	// TODO: sacar lock.
+	mutex.unlock();
 }
 
+/// \todo TODO: ver tema de timeout o como salir de un accept().
 void PlaQui::Server::TCPServer::real_run(void) {
 #ifdef DEBUG
 	std::cerr << __FILE__ <<  ": real_run()" << std::endl;
 #endif // DEBUG
 	Connection* connection;
 	while (!stop) {
-		// TODO: ver tema de timeout o como salir de un accept().
 		// Forma grasa de salir del accept: crear conexion que salga al toque.
 		connection = new_connection(socket.accept());
 #ifdef DEBUG
-	std::cerr << __FILE__ <<  ": real_run(): connection = " << connection
-		<< std::endl;
+		std::cerr << __FILE__ <<  ": real_run(): connection = " << connection
+			<< std::endl;
 #endif // DEBUG
-		// TODO: poner lock.
+		mutex.lock();
 		connections.push_back(connection);
 #ifdef DEBUG
-	std::cerr << __FILE__ <<  ": real_run(): lista de conexiones" << std::endl;
-	for (ConnectionList::const_iterator i = connections.begin();
-			i != connections.end(); i++) {
-		std::cerr << "\t " << *i << std::endl;
-	}
+		std::cerr << __FILE__ <<  ": real_run(): lista de conexiones" << std::endl;
+		for (ConnectionList::const_iterator i = connections.begin();
+				i != connections.end(); i++) {
+			std::cerr << "\t " << *i << std::endl;
+		}
 #endif // DEBUG
-		// TODO: sacar lock.
-		// TODO: esto va en Server::new_connection()
+		mutex.unlock();
 		// Conecto la señal para cuando termina una conexión, borrarla.
 		connection->signal_finished().connect(
 				SigC::bind<Connection*>(
diff --git a/Server/tests/server_test.cpp b/Server/tests/server_test.cpp
index eddd8dd..1927af4 100644
--- a/Server/tests/server_test.cpp
+++ b/Server/tests/server_test.cpp
@@ -53,6 +53,9 @@ int main(int argc, char* argv[]) {
 		str >> port;
 	}
 
+	// Inicializa threads.
+	Glib::thread_init();
+
 	// Corre el server.
 	Server server(port);
 	server.run(false);