/*
* pg_advisory_xact_lock_shared(int8) - acquire xact scoped
* share lock on an int8 key
*/
Datum
pg_advisory_xact_lock_shared_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ShareLock, false, false);
PG_RETURN_VOID();
}
/*
* pg_advisory_lock(int8) - acquire exclusive lock on an int8 key
*/
Datum
pg_advisory_lock_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ExclusiveLock, true, false);
PG_RETURN_VOID();
}
/*
* pg_advisory_unlock_shared(int8) - release share lock on an int8 key
*
* Returns true if successful, false if lock was not held
*/
Datum
pg_advisory_unlock_shared_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
bool res;
SET_LOCKTAG_INT64(tag, key);
res = LockRelease(&tag, ShareLock, true);
PG_RETURN_BOOL(res);
}
/*
* pg_try_advisory_xact_lock_shared(int8) - acquire xact scoped
* share lock on an int8 key, no wait
*
* Returns true if successful, false if lock not available
*/
Datum
pg_try_advisory_xact_lock_shared_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
LockAcquireResult res;
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ShareLock, false, true);
PG_RETURN_BOOL(res != LOCKACQUIRE_NOT_AVAIL);
}
/*
* pg_advisory_lock_shared(int8) - acquire share lock on an int8 key
*/
Datum
pg_advisory_lock_shared_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
(void) LockAcquire(&tag, ShareLock, true, false);
PG_RETURN_VOID();
}
/*
* pg_advisory_unlock(int8) - release exclusive lock on an int8 key
*
* Returns true if successful, false if lock was not held
*/
Datum
pg_advisory_unlock_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
bool res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockRelease(&tag, ExclusiveLock, true);
PG_RETURN_BOOL(res);
}
/*
* pg_try_advisory_lock_shared(int8) - acquire share lock on an int8 key, no wait
*
* Returns true if successful, false if lock not available
*/
Datum
pg_try_advisory_lock_shared_int8(PG_FUNCTION_ARGS)
{
int64 key = PG_GETARG_INT64(0);
LOCKTAG tag;
LockAcquireResult res;
PreventAdvisoryLocksInParallelMode();
SET_LOCKTAG_INT64(tag, key);
res = LockAcquire(&tag, ShareLock, true, true);
PG_RETURN_BOOL(res != LOCKACQUIRE_NOT_AVAIL);
}
