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Code Issues

Front-ported Nickolay's improvement for the shared counter.

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This commit is contained in:
dimitr 2014-08-10 20:07:45 +00:00
parent 3722fedb4b
commit 51d1cd35d3
2 changed files with 3 additions and 25 deletions
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26
src/jrd/Database.cpp
View File

@ -270,8 +270,8 @@ namespace Jrd
if (!counter->lock)
{
Lock* const lock = FB_NEW_RPT(*dbb->dbb_permanent, 0)
Lock(tdbb, sizeof(SLONG), LCK_shared_counter, counter, blockingAst);
Lock* const lock =
FB_NEW_RPT(*dbb->dbb_permanent, 0) Lock(tdbb, sizeof(SLONG), LCK_shared_counter);
counter->lock = lock;
lock->lck_key.lck_long = space;
LCK_lock(tdbb, lock, LCK_PW, LCK_WAIT);
@ -283,7 +283,6 @@ namespace Jrd
if (counter->curVal > counter->maxVal)
{
LCK_convert(tdbb, counter->lock, LCK_PW, LCK_WAIT);
counter->curVal = LCK_read_data(tdbb, counter->lock);
if (!counter->curVal)
@ -294,31 +293,12 @@ namespace Jrd
counter->maxVal = counter->curVal + prefetch - 1;
LCK_write_data(tdbb, counter->lock, counter->maxVal + 1);
LCK_convert(tdbb, counter->lock, LCK_SR, LCK_WAIT);
}
return counter->curVal++;
}
int Database::SharedCounter::blockingAst(void* ast_object)
{
ValueCache* const counter = static_cast<ValueCache*>(ast_object);
fb_assert(counter && counter->lock);
Database* const dbb = counter->lock->lck_dbb;
try
{
AsyncContextHolder tdbb(dbb, FB_FUNCTION);
SyncLockGuard guard(&dbb->dbb_sh_counter_sync, SYNC_EXCLUSIVE, "Database::blockingAstSharedCounter");
LCK_downgrade(tdbb, counter->lock);
}
catch (const Exception&)
{} // no-op
return 0;
}
void Database::Linger::handler()
{
JRD_shutdown_database(dbb, SHUT_DBB_RELEASE_POOLS);

2
src/jrd/Database.h
View File

@ -259,8 +259,6 @@ public:
void shutdown(thread_db* tdbb);
private:
static int blockingAst(void* arg);
ValueCache m_counters[TOTAL_ITEMS];
};