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Fix cross-thread buffer usage

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If the initial handshake that is sent by the accepting thread is buffered,
the subsequent flushing of it is done by the owning thread. As
cross-thread buffer usage is not allowed, the initial handshake must be
sent by the owning thread.
This commit is contained in:
Markus Mäkelä 2018-11-09 09:51:47 +02:00
parent 514b5f7856
commit 0a9d24230a
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GPG Key ID: 72D48FCE664F7B19
1 changed files with 11 additions and 20 deletions
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31
server/modules/protocol/MySQL/mariadbclient/mysql_client.cc
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@ -34,7 +34,7 @@
#include <maxscale/protocol/mysql.h>
#include <maxscale/query_classifier.h>
#include <maxscale/router.h>
#include <maxscale/routingworker.h>
#include <maxscale/routingworker.hh>
#include <maxscale/session.h>
#include <maxscale/ssl.h>
#include <maxscale/utils.h>
@ -424,6 +424,7 @@ int MySQLSendHandshake(DCB* dcb)
// writing data in the Client buffer queue
dcb->func.write(dcb, buf);
protocol->protocol_auth_state = MXS_AUTH_STATE_MESSAGE_READ;
return sizeof(mysql_packet_header) + mysql_payload_size;
}
@ -1422,25 +1423,6 @@ int gw_MySQLAccept(DCB* listener)
static void gw_process_one_new_client(DCB* client_dcb)
{
MySQLProtocol* protocol;
protocol = mysql_protocol_init(client_dcb, client_dcb->fd);
if (protocol == NULL)
{
/** delete client_dcb */
dcb_close(client_dcb);
MXS_ERROR("Failed to create protocol object for client connection.");
return;
}
client_dcb->protocol = protocol;
// send handshake to the client_dcb
MySQLSendHandshake(client_dcb);
// client protocol state change
protocol->protocol_auth_state = MXS_AUTH_STATE_MESSAGE_READ;
/**
* Set new descriptor to event set. At the same time,
* change state to DCB_STATE_POLLING so that
@ -1466,6 +1448,15 @@ static void gw_process_one_new_client(DCB* client_dcb)
}
else
{
// Move the rest of the initialization process to the owning worker
mxs::RoutingWorker* worker = static_cast<mxs::RoutingWorker*>(client_dcb->poll.owner);
worker->execute([=](){
client_dcb->protocol = mysql_protocol_init(client_dcb, client_dcb->fd);
MXS_ABORT_IF_NULL(client_dcb->protocol);
MySQLSendHandshake(client_dcb);
}, mxs::RoutingWorker::EXECUTE_AUTO);
MXS_DEBUG("Added dcb %p for fd %d to epoll set.",
client_dcb,
client_dcb->fd);