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59 lines
2.5 KiB
C
59 lines
2.5 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2023 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef MICROPY_INCLUDED_RP2_MUTEX_EXTRA_H
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#define MICROPY_INCLUDED_RP2_MUTEX_EXTRA_H
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#include "pico/mutex.h"
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uint32_t recursive_mutex_enter_blocking_and_disable_interrupts(recursive_mutex_t *mtx);
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void recursive_mutex_exit_and_restore_interrupts(recursive_mutex_t *mtx, uint32_t save);
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// Alternative version of recursive_mutex_t that doesn't issue WFE and SEV
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// instructions. This means it will use more power (busy-waits), but exiting
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// this mutex doesn't disrupt the calling CPU's event state in the same way a
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// recursive mutex does (because recurse_mutex_exit() executes SEV each time the
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// mutex is released.)
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//
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// Implement as a wrapper type because no longer compatible with the normal
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// recursive_mutex functions.
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typedef struct {
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recursive_mutex_t mutex;
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} recursive_mutex_nowait_t;
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static inline void recursive_mutex_nowait_init(recursive_mutex_nowait_t *mtx) {
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recursive_mutex_init(&mtx->mutex);
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}
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static inline bool recursive_mutex_nowait_try_enter(recursive_mutex_nowait_t *mtx, uint32_t *owner_out) {
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return recursive_mutex_try_enter(&mtx->mutex, owner_out);
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}
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void recursive_mutex_nowait_enter_blocking(recursive_mutex_nowait_t *mtx);
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void recursive_mutex_nowait_exit(recursive_mutex_nowait_t *mtx);
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#endif // MICROPY_INCLUDED_RP2_MUTEX_EXTRA_H
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