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102 lines
3.6 KiB
C
102 lines
3.6 KiB
C
/*
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Copyright (c) 2012, Broadcom Europe Ltd
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*=============================================================================
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VideoCore OS Abstraction Layer - named semaphores
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=============================================================================*/
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#ifndef VCOS_GENERIC_NAMED_SEM_H
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#define VCOS_GENERIC_NAMED_SEM_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "interface/vcos/vcos_types.h"
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/**
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* \file
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*
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* Generic support for named semaphores, using regular ones. This is only
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* suitable for emulating them on an embedded MMUless system, since there is
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* no support for opening semaphores across process boundaries.
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*
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*/
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#define VCOS_NAMED_SEMAPHORE_NAMELEN 64
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/* In theory we could use the name facility provided within Nucleus. However, this
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* is hard to do as semaphores are constantly being created and destroyed; we
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* would need to stop everything while allocating the memory for the semaphore
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* list and then walking it. So keep our own list.
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*/
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typedef struct VCOS_NAMED_SEMAPHORE_T
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{
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struct VCOS_NAMED_SEMAPHORE_IMPL_T *actual; /**< There are 'n' named semaphores per 1 actual semaphore */
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VCOS_SEMAPHORE_T *sem; /**< Pointer to actual underlying semaphore */
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} VCOS_NAMED_SEMAPHORE_T;
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_
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vcos_generic_named_semaphore_create(VCOS_NAMED_SEMAPHORE_T *sem, const char *name, VCOS_UNSIGNED count);
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VCOSPRE_ void VCOSPOST_ vcos_named_semaphore_delete(VCOS_NAMED_SEMAPHORE_T *sem);
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ _vcos_named_semaphore_init(void);
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VCOSPRE_ void VCOSPOST_ _vcos_named_semaphore_deinit(void);
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#if defined(VCOS_INLINE_BODIES)
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VCOS_INLINE_IMPL
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VCOS_STATUS_T vcos_named_semaphore_create(VCOS_NAMED_SEMAPHORE_T *sem, const char *name, VCOS_UNSIGNED count) {
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return vcos_generic_named_semaphore_create(sem, name, count);
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}
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VCOS_INLINE_IMPL
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void vcos_named_semaphore_wait(VCOS_NAMED_SEMAPHORE_T *sem) {
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vcos_semaphore_wait(sem->sem);
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}
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VCOS_INLINE_IMPL
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VCOS_STATUS_T vcos_named_semaphore_trywait(VCOS_NAMED_SEMAPHORE_T *sem) {
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return vcos_semaphore_trywait(sem->sem);
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}
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VCOS_INLINE_IMPL
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void vcos_named_semaphore_post(VCOS_NAMED_SEMAPHORE_T *sem) {
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vcos_semaphore_post(sem->sem);
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}
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif
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