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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 OSCAR lab, Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_object.c
- *
- * This file contains APIs for closing or polling PAL handles.
- */
- #include "pal_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_error.h"
- #include "pal_debug.h"
- #include "api.h"
- #include "atomic.h"
- int _DkObjectReference (PAL_HANDLE objectHandle)
- {
- if (!objectHandle || UNKNOWN_HANDLE(objectHandle))
- return -PAL_ERROR_INVAL;
- atomic_inc(&HANDLE_HDR(objectHandle)->ref);
- return 0;
- }
- void DkObjectReference (PAL_HANDLE objectHandle)
- {
- ENTER_PAL_CALL(DkObjectReference);
- int ret = _DkObjectReference(objectHandle);
- if (ret < 0)
- _DkRaiseFailure(-ret);
- LEAVE_PAL_CALL();
- }
- int _DkObjectClose (PAL_HANDLE objectHandle)
- {
- if (!objectHandle || UNKNOWN_HANDLE(objectHandle))
- return -PAL_ERROR_INVAL;
- if (atomic_dec_and_test_nonnegative(&HANDLE_HDR(objectHandle)->ref))
- return 0;
- const struct handle_ops * ops = HANDLE_OPS(objectHandle);
- /* if the operation 'close' is defined, call the function. */
- if (ops && ops->close)
- return ops->close(objectHandle);
- free(objectHandle);
- return 0;
- }
- /* PAL call DkObjectClose: Close the given object handle. This function is
- different from DkStreamDelete. It works on all kinds of handles, and it
- simply close the reference to the object, the stream is not actually
- deleted. */
- void DkObjectClose (PAL_HANDLE objectHandle)
- {
- ENTER_PAL_CALL(DkObjectClose);
- int ret = _DkObjectClose(objectHandle);
- if (ret < 0)
- _DkRaiseFailure(-ret);
- LEAVE_PAL_CALL();
- }
- /* PAL call DkObjectsWaitAny: wait for any of the handles in the handle array.
- The wait can be timed out, unless NO_TIMEOUT is given for the timeout
- argument. */
- PAL_HANDLE
- DkObjectsWaitAny (PAL_NUM count, PAL_HANDLE * handleArray, PAL_NUM timeout)
- {
- ENTER_PAL_CALL(DkObjectsWaitAny);
- if (!count || !handleArray) {
- _DkRaiseFailure(PAL_ERROR_INVAL);
- LEAVE_PAL_CALL_RETURN(NULL);
- }
- for (int i = 0 ; i < count ; i++)
- if (UNKNOWN_HANDLE(handleArray[i]))
- handleArray[i] = NULL;
- PAL_HANDLE polled = NULL;
- int ret = _DkObjectsWaitAny (count, handleArray,
- timeout == NO_TIMEOUT ? -1 : timeout,
- &polled);
- if (ret < 0) {
- _DkRaiseFailure(-ret);
- polled = NULL;
- }
- LEAVE_PAL_CALL_RETURN(polled);
- }
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