54 lines
2.5 KiB
C
54 lines
2.5 KiB
C
// Copyright 2022 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#if defined(PLATFORM_SUPPORTS_SYNCHRONIZATION)
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# if defined(SPLIT_KEYBOARD)
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void split_shared_memory_lock(void);
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void split_shared_memory_unlock(void);
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# endif
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#else
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# if defined(SPLIT_KEYBOARD)
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inline void split_shared_memory_lock(void){};
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inline void split_shared_memory_unlock(void){};
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# endif
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#endif
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/* GCCs cleanup attribute expects a function with one parameter, which is a
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* pointer to a type compatible with the variable. As we don't want to expose
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* the platforms internal mutex type this workaround with auto generated adapter
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* function is defined */
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#define QMK_DECLARE_AUTOUNLOCK_HELPERS(prefix) \
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inline unsigned prefix##_autounlock_lock_helper(void) { \
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prefix##_lock(); \
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return 0; \
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} \
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\
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inline void prefix##_autounlock_unlock_helper(unsigned* unused_guard) { \
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prefix##_unlock(); \
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}
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/* Generate an out-of-line implementation in case the inline functions defined
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* by the above macro don't actually get inlined. */
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#define QMK_IMPLEMENT_AUTOUNLOCK_HELPERS(prefix) \
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extern inline unsigned prefix##_autounlock_lock_helper(void); \
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extern inline void prefix##_autounlock_unlock_helper(unsigned* unused_guard);
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/* Convinience macro the automatically generate the correct RAII-style
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* lock_autounlock function macro */
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#define QMK_DECLARE_AUTOUNLOCK_CALL(prefix) unsigned prefix##_guard __attribute__((unused, cleanup(prefix##_autounlock_unlock_helper))) = prefix##_autounlock_lock_helper
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#if defined(SPLIT_KEYBOARD)
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QMK_DECLARE_AUTOUNLOCK_HELPERS(split_shared_memory)
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/**
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* @brief Acquire exclusive access to the split keyboard shared memory, by
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* calling the platforms `split_shared_memory_lock()` function. The lock is
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* automatically released by calling the platforms `split_shared_memory_unlock()`
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* function. This happens when the block where
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* `split_shared_memory_lock_autounlock()` is called in goes out of scope i.e.
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* when the enclosing function returns.
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*/
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# define split_shared_memory_lock_autounlock QMK_DECLARE_AUTOUNLOCK_CALL(split_shared_memory)
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#endif
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