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authorrubidium <rubidium@openttd.org>2010-08-15 23:44:45 +0000
committerrubidium <rubidium@openttd.org>2010-08-15 23:44:45 +0000
commit1c3d42598e1de68e109ee27dd289885aabe9878b (patch)
treeace3c990a6bb5df5dc8585af9caa895be3c4b4a1 /src
parent12b882227717811b047d4ae84d95444b167d7226 (diff)
downloadopenttd-1c3d42598e1de68e109ee27dd289885aabe9878b.tar.xz
(svn r20510) -Codechange: unify packet queue handling and make insertion O(1) instead of O(n)
Diffstat (limited to 'src')
-rw-r--r--src/network/core/tcp_game.cpp6
-rw-r--r--src/network/core/tcp_game.h18
-rw-r--r--src/network/network_command.cpp79
-rw-r--r--src/network/network_server.cpp5
4 files changed, 72 insertions, 36 deletions
diff --git a/src/network/core/tcp_game.cpp b/src/network/core/tcp_game.cpp
index 8044ef138..66a1b6f81 100644
--- a/src/network/core/tcp_game.cpp
+++ b/src/network/core/tcp_game.cpp
@@ -36,12 +36,6 @@ NetworkClientSocket::NetworkClientSocket(ClientID client_id)
NetworkClientSocket::~NetworkClientSocket()
{
- while (this->command_queue != NULL) {
- CommandPacket *p = this->command_queue->next;
- free(this->command_queue);
- this->command_queue = p;
- }
-
if (_redirect_console_to_client == this->client_id) _redirect_console_to_client = INVALID_CLIENT_ID;
this->client_id = INVALID_CLIENT_ID;
this->status = STATUS_INACTIVE;
diff --git a/src/network/core/tcp_game.h b/src/network/core/tcp_game.h
index 70a261d08..d6952d1bf 100644
--- a/src/network/core/tcp_game.h
+++ b/src/network/core/tcp_game.h
@@ -74,6 +74,22 @@ enum TCPPacketType {
/** Packet that wraps a command */
struct CommandPacket;
+/** A queue of CommandPackets. */
+class CommandQueue {
+ CommandPacket *first; ///< The first packet in the queue.
+ CommandPacket *last; ///< The last packet in the queue; only valid when first != NULL.
+
+public:
+ /** Initialise the command queue. */
+ CommandQueue() : first(NULL), last(NULL) {}
+ /** Clear the command queue. */
+ ~CommandQueue() { this->Free(); }
+ void Append(CommandPacket *p);
+ CommandPacket *Pop();
+ CommandPacket *Peek();
+ void Free();
+};
+
/** Status of a client */
enum ClientStatus {
STATUS_INACTIVE, ///< The client is not connected nor active
@@ -106,7 +122,7 @@ public:
ClientStatus status; ///< Status of this client
- CommandPacket *command_queue; ///< The command-queue awaiting delivery
+ CommandQueue command_queue; ///< The command-queue awaiting delivery
NetworkRecvStatus CloseConnection(bool error = true);
diff --git a/src/network/network_command.cpp b/src/network/network_command.cpp
index 39eae0f94..8c550338c 100644
--- a/src/network/network_command.cpp
+++ b/src/network/network_command.cpp
@@ -52,8 +52,53 @@ static CommandCallback * const _callback_table[] = {
/* 0x19 */ CcStartStopVehicle,
};
+/**
+ * Append a CommandPacket at the end of the queue.
+ * @param p The packet to append to the queue.
+ */
+void CommandQueue::Append(CommandPacket *p)
+{
+ assert(p != NULL);
+ if (this->first == NULL) {
+ this->first = p;
+ } else {
+ this->last->next = p;
+ }
+ this->last = p;
+}
+
+/**
+ * Return the first item in the queue and remove it from the queue.
+ * @return the first item in the queue.
+ */
+CommandPacket *CommandQueue::Pop()
+{
+ CommandPacket *ret = this->first;
+ if (ret != NULL) this->first = this->first->next;
+ return ret;
+}
+
+/**
+ * Return the first item in the queue, but don't remove it.
+ * @return the first item in the queue.
+ */
+CommandPacket *CommandQueue::Peek()
+{
+ return this->first;
+}
+
+/** Free everything that is in the queue. */
+void CommandQueue::Free()
+{
+ CommandPacket *cp;
+ while ((cp = this->Pop()) != NULL) {
+ free(cp);
+ }
+}
+
+
/** Local queue of packets */
-static CommandPacket *_local_command_queue = NULL;
+static CommandQueue _local_command_queue;
/**
* Add a command to the local or client socket command queue,
@@ -65,16 +110,7 @@ void NetworkAddCommandQueue(CommandPacket cp, NetworkClientSocket *cs)
{
CommandPacket *new_cp = MallocT<CommandPacket>(1);
*new_cp = cp;
-
- CommandPacket **begin = (cs == NULL ? &_local_command_queue : &cs->command_queue);
-
- if (*begin == NULL) {
- *begin = new_cp;
- } else {
- CommandPacket *c = *begin;
- while (c->next != NULL) c = c->next;
- c->next = new_cp;
- }
+ (cs == NULL ? _local_command_queue : cs->command_queue).Append(new_cp);
}
/**
@@ -141,7 +177,7 @@ void NetworkSend_Command(TileIndex tile, uint32 p1, uint32 p2, uint32 cmd, Comma
*/
void NetworkSyncCommandQueue(NetworkClientSocket *cs)
{
- for (CommandPacket *p = _local_command_queue; p != NULL; p = p->next) {
+ for (CommandPacket *p = _local_command_queue.Peek(); p != NULL; p = p->next) {
CommandPacket c = *p;
c.callback = 0;
c.next = NULL;
@@ -156,26 +192,24 @@ void NetworkExecuteLocalCommandQueue()
{
assert(IsLocalCompany());
- while (_local_command_queue != NULL) {
-
+ CommandPacket *cp;
+ while ((cp = _local_command_queue.Peek()) != NULL) {
/* The queue is always in order, which means
* that the first element will be executed first. */
- if (_frame_counter < _local_command_queue->frame) break;
+ if (_frame_counter < cp->frame) break;
- if (_frame_counter > _local_command_queue->frame) {
+ if (_frame_counter > cp->frame) {
/* If we reach here, it means for whatever reason, we've already executed
* past the command we need to execute. */
error("[net] Trying to execute a packet in the past!");
}
- CommandPacket *cp = _local_command_queue;
-
/* We can execute this command */
_current_company = cp->company;
cp->cmd |= CMD_NETWORK_COMMAND;
DoCommandP(cp, cp->my_cmd);
- _local_command_queue = _local_command_queue->next;
+ _local_command_queue.Pop();
free(cp);
}
@@ -188,12 +222,7 @@ void NetworkExecuteLocalCommandQueue()
*/
void NetworkFreeLocalCommandQueue()
{
- /* Free all queued commands */
- while (_local_command_queue != NULL) {
- CommandPacket *p = _local_command_queue;
- _local_command_queue = _local_command_queue->next;
- free(p);
- }
+ _local_command_queue.Free();
}
/**
diff --git a/src/network/network_server.cpp b/src/network/network_server.cpp
index bd01d9300..d2f3ce3ab 100644
--- a/src/network/network_server.cpp
+++ b/src/network/network_server.cpp
@@ -1618,11 +1618,8 @@ void NetworkServer_ReadPackets(NetworkClientSocket *cs)
static void NetworkHandleCommandQueue(NetworkClientSocket *cs)
{
CommandPacket *cp;
-
- while ( (cp = cs->command_queue) != NULL) {
+ while ((cp = cs->command_queue.Pop()) != NULL) {
SEND_COMMAND(PACKET_SERVER_COMMAND)(cs, cp);
-
- cs->command_queue = cp->next;
free(cp);
}
}