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102 lines
3.2 KiB
102 lines
3.2 KiB
/* |
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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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FIXME: This code should be moved to 'linux', it is linux-specific and not generic |
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on 'pthreads'. |
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============================================================================*/ |
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#ifndef VCOS_MUTEX_FROM_FUTEX_H |
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#define VCOS_MUTEX_FROM_FUTEX_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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#include "vcos_platform.h" |
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typedef struct VCOS_FUTEX_T |
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{ |
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volatile int value; |
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} VCOS_FUTEX_T; |
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typedef VCOS_FUTEX_T VCOS_MUTEX_T; |
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ vcos_futex_init(VCOS_FUTEX_T *futex); |
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VCOSPRE_ void VCOSPOST_ vcos_futex_delete(VCOS_FUTEX_T *futex); |
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ vcos_futex_lock(VCOS_FUTEX_T *futex); |
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VCOSPRE_ void VCOSPOST_ vcos_futex_unlock(VCOS_FUTEX_T *futex); |
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VCOSPRE_ VCOS_STATUS_T VCOSPOST_ vcos_futex_trylock(VCOS_FUTEX_T *futex); |
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#if defined(VCOS_INLINE_BODIES) |
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VCOS_INLINE_IMPL |
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VCOS_STATUS_T vcos_mutex_create(VCOS_MUTEX_T *latch, const char *name) { |
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vcos_unused(name); |
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return vcos_futex_init(latch); |
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} |
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VCOS_INLINE_IMPL |
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void vcos_mutex_delete(VCOS_MUTEX_T *latch) { |
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vcos_futex_delete(latch); |
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} |
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VCOS_INLINE_IMPL |
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VCOS_STATUS_T vcos_mutex_lock(VCOS_MUTEX_T *latch) { |
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return vcos_futex_lock(latch); |
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} |
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VCOS_INLINE_IMPL |
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void vcos_mutex_unlock(VCOS_MUTEX_T *latch) { |
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vcos_futex_unlock(latch); |
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} |
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VCOS_INLINE_IMPL |
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int vcos_mutex_is_locked(VCOS_MUTEX_T *latch) { |
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int rc = latch->value; |
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if (!rc) { |
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/* it wasn't locked */ |
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return 0; |
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} |
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else { |
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return 1; /* it was locked */ |
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} |
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} |
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VCOS_INLINE_IMPL |
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VCOS_STATUS_T vcos_mutex_trylock(VCOS_MUTEX_T *m) { |
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return vcos_futex_trylock(m); |
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} |
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#endif /* VCOS_INLINE_BODIES */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* VCOS_MUTEX_FROM_FUTEX_H */ |
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