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Code Issues

Better (methinks) synchronization for the monitoring stuff. Being field tested.

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This commit is contained in:
dimitr 2014-08-10 20:11:41 +00:00
parent 51d1cd35d3
commit d4492eea92
3 changed files with 26 additions and 26 deletions
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23
src/jrd/Attachment.cpp
View File

@ -434,7 +434,7 @@ void Jrd::Attachment::initLocks(thread_db* tdbb)
Lock(tdbb, sizeof(SLONG), LCK_monitor, this, blockingAstMonitor);
att_monitor_lock = lock;
lock->lck_key.lck_long = att_attachment_id;
LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT);
LCK_lock(tdbb, lock, LCK_EX, LCK_WAIT);
// Unless we're a system attachment, allocate the cancellation lock
@ -644,17 +644,20 @@ int Jrd::Attachment::blockingAstMonitor(void* ast_object)
AsyncContextHolder tdbb(dbb, FB_FUNCTION, attachment->att_monitor_lock);
try
if (!(attachment->att_flags & ATT_monitor_done))
{
Monitoring::dumpAttachment(tdbb, attachment, true);
}
catch (const Exception& ex)
{
iscLogException("Cannot dump the monitoring data", ex);
}
try
{
Monitoring::dumpAttachment(tdbb, attachment, true);
}
catch (const Exception& ex)
{
iscLogException("Cannot dump the monitoring data", ex);
}
LCK_release(tdbb, attachment->att_monitor_lock);
attachment->att_flags |= ATT_monitor_off;
LCK_downgrade(tdbb, attachment->att_monitor_lock);
attachment->att_flags |= ATT_monitor_done;
}
}
catch (const Exception&)
{} // no-op

4
src/jrd/Attachment.h
View File

@ -478,8 +478,8 @@ const ULONG ATT_manual_lock = 0x00800L; // Was locked manually
const ULONG ATT_async_manual_lock = 0x01000L; // Async mutex was locked manually
const ULONG ATT_purge_started = 0x02000L; // Purge already started - avoid 2 purges at once
const ULONG ATT_system = 0x04000L; // Special system attachment
const ULONG ATT_creator = 0x08000L; // This attachment created the DB.
const ULONG ATT_monitor_off = 0x10000L; // Monitoring lock is released
const ULONG ATT_creator = 0x08000L; // This attachment created the DB
const ULONG ATT_monitor_done = 0x10000L; // Monitoring data is refreshed
const ULONG ATT_NO_CLEANUP = (ATT_no_cleanup | ATT_notify_gc);

25
src/jrd/Monitoring.cpp
View File

@ -351,15 +351,16 @@ MonitoringSnapshot::MonitoringSnapshot(thread_db* tdbb, MemoryPool& pool)
RecordBuffer* const ctx_var_buffer = allocBuffer(tdbb, pool, rel_mon_ctx_vars);
RecordBuffer* const mem_usage_buffer = allocBuffer(tdbb, pool, rel_mon_mem_usage);
// Release our own lock
LCK_release(tdbb, attachment->att_monitor_lock);
attachment->att_flags &= ~ATT_monitor_off;
// Dump our own data
// Dump our own data and downgrade the lock, if required
Monitoring::dumpAttachment(tdbb, attachment, false);
if (!(attachment->att_flags & ATT_monitor_done))
{
LCK_convert(tdbb, attachment->att_monitor_lock, LCK_SR, LCK_NO_WAIT);
attachment->att_flags |= ATT_monitor_done;
}
// Enumerate active sessions
MonitoringData::SessionList sessions(pool);
@ -384,7 +385,7 @@ MonitoringSnapshot::MonitoringSnapshot(thread_db* tdbb, MemoryPool& pool)
{
lock->lck_key.lck_long = *iter;
if (LCK_lock(tdbb, lock, LCK_EX, LCK_WAIT))
if (LCK_lock(tdbb, lock, LCK_SR, LCK_WAIT))
LCK_release(tdbb, lock);
}
}
@ -419,10 +420,6 @@ MonitoringSnapshot::MonitoringSnapshot(thread_db* tdbb, MemoryPool& pool)
dbb->dbb_monitoring_data->read(self_att_id, temp_space);
}
// Mark our attachment as requesting a new lock
attachment->att_flags |= ATT_monitor_off;
string databaseName(dbb->dbb_database_name.c_str());
ISC_systemToUtf8(databaseName);
@ -1148,11 +1145,11 @@ void Monitoring::checkState(thread_db* tdbb)
Jrd::Attachment* const attachment = tdbb->getAttachment();
if (attachment->att_flags & ATT_monitor_off)
if (attachment->att_flags & ATT_monitor_done)
{
// Enable signal handler for the monitoring stuff
attachment->att_flags &= ~ATT_monitor_off;
LCK_lock(tdbb, attachment->att_monitor_lock, LCK_SR, LCK_WAIT);
attachment->att_flags &= ~ATT_monitor_done;
LCK_convert(tdbb, attachment->att_monitor_lock, LCK_EX, LCK_WAIT);
}
}