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77 lines
2.5 KiB
C
77 lines
2.5 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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#include "interface/vcos/vcos.h"
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#include "interface/vcos/vcos_reentrant_mutex.h"
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VCOS_STATUS_T vcos_generic_reentrant_mutex_create(VCOS_REENTRANT_MUTEX_T *m, const char *name)
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{
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m->count = 0;
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m->owner = 0;
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return vcos_mutex_create(&m->mutex, name);
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}
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void vcos_generic_reentrant_mutex_delete(VCOS_REENTRANT_MUTEX_T *m)
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{
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vcos_assert(m->count == 0);
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vcos_mutex_delete(&m->mutex);
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}
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void vcos_generic_reentrant_mutex_lock(VCOS_REENTRANT_MUTEX_T *m)
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{
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VCOS_THREAD_T *thread = vcos_thread_current();
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vcos_assert(m);
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vcos_assert(thread != 0);
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if (m->owner != thread)
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{
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vcos_mutex_lock(&m->mutex);
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m->owner = thread;
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vcos_assert(m->count == 0);
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}
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m->count++;
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}
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void vcos_generic_reentrant_mutex_unlock(VCOS_REENTRANT_MUTEX_T *m)
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{
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vcos_assert(m->count != 0);
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vcos_assert(m->owner == vcos_thread_current());
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m->count--;
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if (m->count == 0)
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{
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m->owner = 0;
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vcos_mutex_unlock(&m->mutex);
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}
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}
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