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/* ----> DO NOT REMOVE THE FOLLOWING NOTICE <----
Copyright (c) 2014-2017 Datalight, Inc.
All Rights Reserved Worldwide.
This program 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; use version 2 of the License.
This program is distributed in the hope that it will be useful,
but "AS-IS," 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, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/* Businesses and individuals that for commercial or other reasons cannot
comply with the terms of the GPLv2 license may obtain a commercial license
before incorporating Reliance Edge into proprietary software for
distribution in any form. Visit http://www.datalight.com/reliance-edge for
more information.
*/
/** @file
@brief Implements a synchronization object to provide mutual exclusion.
*/
#include "ch.h"
#include "hal.h"
#if (HAL_USE_SDMMC == TRUE)
#include "sama_sdmmc_lld.h"
#if SDMMC_USE_RELEDGE_LIB == 1
#include <redfs.h>
#include <redosdeviations.h>
#if REDCONF_TASK_COUNT > 1U
static semaphore_t red_sem;
/** @brief Initialize the mutex.
After initialization, the mutex is in the released state.
The behavior of calling this function when the mutex is still initialized
is undefined.
@return A negated ::REDSTATUS code indicating the operation result.
@retval 0 Operation was successful.
*/
REDSTATUS RedOsMutexInit(void)
{
chSemObjectInit(&red_sem, 1);
return 0;
}
/** @brief Uninitialize the mutex.
The behavior of calling this function when the mutex is not initialized is
undefined; likewise, the behavior of uninitializing the mutex when it is
in the acquired state is undefined.
@return A negated ::REDSTATUS code indicating the operation result.
@retval 0 Operation was successful.
*/
REDSTATUS RedOsMutexUninit(void)
{
chSemReset(&red_sem, 0);
return 0;
}
/** @brief Acquire the mutex.
The behavior of calling this function when the mutex is not initialized is
undefined; likewise, the behavior of recursively acquiring the mutex is
undefined.
*/
void RedOsMutexAcquire(void)
{
chSemWaitTimeout(&red_sem, TIME_INFINITE);
}
/** @brief Release the mutex.
The behavior is undefined in the following cases:
- Releasing the mutex when the mutex is not initialized.
- Releasing the mutex when it is not in the acquired state.
- Releasing the mutex from a task or thread other than the one which
acquired the mutex.
*/
void RedOsMutexRelease(void)
{
chSemSignal(&red_sem);
}
#endif
#endif
#endif
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