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Code Issues

Backport fix for race condition when two different events could use same instance of unused Rvnt.

Browse Source 
Details at fb-devel, thread "Concurrency bugs in posting events?" by Mark Rotteveel.
Thanks to Adriano for discovering issue.
This commit is contained in:
hvlad 2017-04-14 00:17:17 +03:00
parent 40a7c45b27
commit c2d3266fce
1 changed files with 15 additions and 15 deletions
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30
src/remote/server/server.cpp
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@ -917,6 +917,19 @@ public:
if (!allowCancel)
return;
if (!(port->port_flags & PORT_disconnect))
{
PACKET packet;
packet.p_operation = op_event;
P_EVENT* p_event = &packet.p_event;
p_event->p_event_database = rdb->rdb_id;
p_event->p_event_items.cstr_length = length;
p_event->p_event_items.cstr_address = items;
p_event->p_event_rid = event->rvnt_id;
port->send(&packet);
}
if (event->rvnt_iface)
{
LocalStatus ls;
@ -924,19 +937,6 @@ public:
event->rvnt_iface->cancel(&status_vector);
event->rvnt_iface = NULL;
}
if (port->port_flags & PORT_disconnect)
return;
PACKET packet;
packet.p_operation = op_event;
P_EVENT* p_event = &packet.p_event;
p_event->p_event_database = rdb->rdb_id;
p_event->p_event_items.cstr_length = length;
p_event->p_event_items.cstr_address = items;
p_event->p_event_rid = event->rvnt_id;
port->send(&packet);
}
int release()
@ -4746,8 +4746,8 @@ ISC_STATUS rem_port::que_events(P_EVENT * stuff, PACKET* sendL)
{
if (!event->rvnt_iface)
{
event->rvnt_destroyed = 0;
break;
if (event->rvnt_destroyed.compareExchange(1, 0))
break;
}
}