portable/ThirdParty/GCC/Xtensa_ESP32_IDF3/xtensa_overlay_os_hook.c

/* xtensa_overlay_os_hook.c -- Overlay manager OS hooks for FreeRTOS. */

/* Copyright (c) 2015-2015 Cadence Design Systems Inc. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be included */
/* in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */


#include "FreeRTOS.h"
#include "semphr.h"

#if configUSE_MUTEX

/* Mutex object that controls access to the overlay. Currently only one
 * overlay region is supported so one mutex suffices.
 */
    static SemaphoreHandle_t xt_overlay_mutex;


/* This function should be overridden to provide OS specific init such
 * as the creation of a mutex lock that can be used for overlay locking.
 * Typically this mutex would be set up with priority inheritance. See
 * overlay manager documentation for more details.
 */
    void xt_overlay_init_os( void )
    {
        /* Create the mutex for overlay access. Priority inheritance is
         * required.
         */
        xt_overlay_mutex = xSemaphoreCreateMutex();
    }


/* This function locks access to shared overlay resources, typically
 * by acquiring a mutex.
 */
    void xt_overlay_lock( void )
    {
        xSemaphoreTake( xt_overlay_mutex, 0 );
    }


/* This function releases access to shared overlay resources, typically
 * by unlocking a mutex.
 */
    void xt_overlay_unlock( void )
    {
        xSemaphoreGive( xt_overlay_mutex );
    }

#endif /* if configUSE_MUTEX */