47 lines
1.5 KiB
C
47 lines
1.5 KiB
C
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// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//replacement for gcc built-in functions
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#include "sdkconfig.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/portmacro.h"
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#include "xtensa/config/core-isa.h"
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#define CMP_EXCHANGE(n, type) bool __atomic_compare_exchange_ ## n (type* mem, type* expect, type desired, int success, int failure) \
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{ \
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bool ret = false; \
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unsigned state = portENTER_CRITICAL_NESTED(); \
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if (*mem == *expect) { \
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ret = true; \
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*mem = desired; \
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} else { \
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*expect = *mem; \
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} \
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portEXIT_CRITICAL_NESTED(state); \
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return ret; \
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}
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//this piece of code should only be compiled if the cpu doesn't support atomic compare and swap (s32c1i)
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#if XCHAL_HAVE_S32C1I == 0
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#pragma GCC diagnostic ignored "-Wbuiltin-declaration-mismatch"
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CMP_EXCHANGE(1, uint8_t)
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CMP_EXCHANGE(2, uint16_t)
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CMP_EXCHANGE(4, uint32_t)
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CMP_EXCHANGE(8, uint64_t)
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#endif
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