C++ (Cpp) pg_atomic_clear_flag Examples

Example #1

File: regress.c Project: MasahikoSawada/postgresql

static void
test_atomic_flag(void)
{
	pg_atomic_flag flag;

	pg_atomic_init_flag(&flag);

	if (!pg_atomic_unlocked_test_flag(&flag))
		elog(ERROR, "flag: unexpectedly set");

	if (!pg_atomic_test_set_flag(&flag))
		elog(ERROR, "flag: couldn't set");

	if (pg_atomic_unlocked_test_flag(&flag))
		elog(ERROR, "flag: unexpectedly unset");

	if (pg_atomic_test_set_flag(&flag))
		elog(ERROR, "flag: set spuriously #2");

	pg_atomic_clear_flag(&flag);

	if (!pg_atomic_unlocked_test_flag(&flag))
		elog(ERROR, "flag: unexpectedly set #2");

	if (!pg_atomic_test_set_flag(&flag))
		elog(ERROR, "flag: couldn't set");

	pg_atomic_clear_flag(&flag);
}

Example #2

File: cfs.c Project: knizhnik/postgresql

Datum cfs_start_gc(PG_FUNCTION_ARGS)
{
	int i = 0;

	if (cfs_gc_workers == 0 && pg_atomic_test_set_flag(&cfs_state->gc_started)) 
	{
		int j;
		BackgroundWorkerHandle** handles;

		cfs_stop = true; /* do just one iteration */	   

		cfs_state->max_iterations = 1;
		cfs_state->n_workers = PG_GETARG_INT32(0);
		handles = (BackgroundWorkerHandle**)palloc(cfs_state->n_workers*sizeof(BackgroundWorkerHandle*));		

		for (i = 0; i < cfs_state->n_workers; i++) {
			BackgroundWorker worker;
			MemSet(&worker, 0, sizeof(worker));
			sprintf(worker.bgw_name, "cfs-worker-%d", i);
			worker.bgw_flags = BGWORKER_SHMEM_ACCESS;
			worker.bgw_start_time = BgWorkerStart_ConsistentState;
			worker.bgw_restart_time = 1;
			worker.bgw_main = cfs_bgworker_main;
			worker.bgw_main_arg = Int32GetDatum(i);
			if (!RegisterDynamicBackgroundWorker(&worker, &handles[i])) { 
				break;
			}
		}
		for (j = 0; j < i; j++) {
			WaitForBackgroundWorkerShutdown(handles[j]);
		}
		pfree(handles);
		pg_atomic_clear_flag(&cfs_state->gc_started);
	}
	PG_RETURN_INT32(i);
}