| /* |
| * Copyright (c) 2024 Raspberry Pi (Trading) Ltd. |
| * Copyright (c) 2024 Stephen Street (stephen@redrocketcomputing.com). |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #ifndef __STDATOMIC_H |
| #define __STDATOMIC_H |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** \file stdatomic.h |
| * \defgroup pico_atomic pico_atomic |
| * |
| * \brief Helper implementations for C11 atomics |
| * |
| * \if rp2040_specific |
| * On RP2040 a spin lock is used as protection for all atomic operations, since there is no C library support. |
| * \endif |
| * |
| * \if rp2350_specific |
| * On RP2350 the C-library provides implementations for all 1-byte, 2-byte and 4-byte atomics using processor |
| * exclusive operations. This library provides a spin-lock protected version for arbitrary-sized atomics (including 64-bit). |
| * \endif |
| */ |
| #include <stdint.h> |
| #include_next <stdatomic.h> |
| |
| // needed for PICO_C_COMPILER_IS_GNU |
| #include "pico.h" |
| |
| #if PICO_RP2040 && PICO_C_COMPILER_IS_GNU |
| // on GNU without exclusive instructions these don't get routed thru _1 functions for some reason |
| #undef atomic_flag_test_and_set |
| #undef atomic_flag_test_and_set_explicit |
| |
| extern _Bool __atomic_test_and_set_c(volatile void *mem, int model); |
| |
| #define atomic_flag_test_and_set(PTR) __atomic_test_and_set_c((PTR), __ATOMIC_SEQ_CST) |
| #define atomic_flag_test_and_set_explicit(PTR, MO) __atomic_test_and_set_c((PTR), (MO)) |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif |
