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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_semaphore.c
- *
- * This file contains APIs that provides operations of semaphores.
- */
- #include "pal_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_error.h"
- #include "api.h"
- PAL_HANDLE
- DkSemaphoreCreate (PAL_NUM initialCount, PAL_NUM maxCount)
- {
- ENTER_PAL_CALL(DkSemaphoreCreate);
- PAL_HANDLE handle = (PAL_HANDLE) malloc(HANDLE_SIZE(semaphore));
- int ret = _DkSemaphoreCreate(handle, initialCount, maxCount);
- if (ret < 0) {
- free(handle);
- _DkRaiseFailure(-ret);
- handle = NULL;
- }
- LEAVE_PAL_CALL_RETURN(handle);
- }
- void
- DkSemaphoreDestroy (PAL_HANDLE semaphoreHandle)
- {
- ENTER_PAL_CALL(DkSemaphoreDestroy);
- if (!semaphoreHandle) {
- _DkRaiseFailure(PAL_ERROR_INVAL);
- LEAVE_PAL_CALL();
- }
- _DkSemaphoreDestroy(semaphoreHandle);
- LEAVE_PAL_CALL();
- }
- void DkSemaphoreRelease (PAL_HANDLE handle, PAL_NUM count)
- {
- ENTER_PAL_CALL(DkSemaphoreRelease);
- if (!handle ||
- !IS_HANDLE_TYPE(handle, semaphore)) {
- _DkRaiseFailure(PAL_ERROR_INVAL);
- LEAVE_PAL_CALL();
- }
- _DkSemaphoreRelease (handle, count);
- LEAVE_PAL_CALL();
- }
- static int sem_wait (PAL_HANDLE handle, int timeout)
- {
- return _DkSemaphoreAcquireTimeout(handle, 1, timeout);
- }
- struct handle_ops sem_ops = {
- .wait = &sem_wait,
- };
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