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create ProcessWaitEvents for separating the logic of handling events

pull/3491/head
SaitTalhaNisanci 2020-02-12 12:20:37 +03:00
parent c35981f9de
commit 355805c7d8
1 changed files with 54 additions and 39 deletions
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93
src/backend/distributed/executor/adaptive_executor.c
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@ -620,6 +620,8 @@ static void ExtractParametersForRemoteExecution(ParamListInfo paramListInfo,
const char ***parameterValues);
static int GetEventSetSize(List *sessionList);
static int UpdateWaitEventSet(DistributedExecution *execution);
static bool ProcessWaitEvents(DistributedExecution *execution, WaitEvent *events, int
eventCount);
/*
* AdaptiveExecutor is called via CitusExecScan on the
@ -2048,46 +2050,9 @@ RunDistributedExecution(DistributedExecution *execution)
/* wait for I/O events */
int eventCount = WaitEventSetWait(execution->waitEventSet, timeout, events,
eventSetSize, WAIT_EVENT_CLIENT_READ);
int eventIndex = 0;
/* process I/O events */
for (; eventIndex < eventCount; eventIndex++)
if (!ProcessWaitEvents(execution, events, eventCount))
{
WaitEvent *event = &events[eventIndex];
if (event->events & WL_POSTMASTER_DEATH)
{
ereport(ERROR, (errmsg("postmaster was shut down, exiting")));
}
if (event->events & WL_LATCH_SET)
{
ResetLatch(MyLatch);
if (execution->raiseInterrupts)
{
CHECK_FOR_INTERRUPTS();
}
if (IsHoldOffCancellationReceived())
{
/*
* Break out of event loop immediately in case of cancellation.
* We cannot use "return" here inside a PG_TRY() block since
* then the exception stack won't be reset.
*/
cancellationReceived = true;
break;
}
continue;
}
WorkerSession *session = (WorkerSession *) event->user_data;
session->latestUnconsumedWaitEvents = event->events;
ConnectionStateMachine(session);
cancellationReceived = true;
}
}
@ -2153,6 +2118,56 @@ UpdateWaitEventSet(DistributedExecution *execution)
}
/*
* ProcessWaitEvents processes the received events from connections.
* It returns true if all events are processed, otherwise false.
*/
static bool
ProcessWaitEvents(DistributedExecution *execution, WaitEvent *events, int eventCount)
{
int eventIndex = 0;
/* process I/O events */
for (; eventIndex < eventCount; eventIndex++)
{
WaitEvent *event = &events[eventIndex];
if (event->events & WL_POSTMASTER_DEATH)
{
ereport(ERROR, (errmsg("postmaster was shut down, exiting")));
}
if (event->events & WL_LATCH_SET)
{
ResetLatch(MyLatch);
if (execution->raiseInterrupts)
{
CHECK_FOR_INTERRUPTS();
}
if (IsHoldOffCancellationReceived())
{
/*
* Break out of event loop immediately in case of cancellation.
* We cannot use "return" here inside a PG_TRY() block since
* then the exception stack won't be reset.
*/
return false;
}
continue;
}
WorkerSession *session = (WorkerSession *) event->user_data;
session->latestUnconsumedWaitEvents = event->events;
ConnectionStateMachine(session);
}
return true;
}
/*
* ManageWorkerPool ensures the worker pool has the appropriate number of connections
* based on the number of pending tasks.