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https://github.com/espressif/ESP8266_RTOS_SDK.git
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47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
// Copyright 2018-2019 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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#include <reent.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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static struct _reent impure_data;
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struct _reent *_global_impure_ptr = &impure_data;
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struct _reent *__getreent()
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{
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#if configUSE_NEWLIB_REENTRANT == 1
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/*
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* Locking mutex(only mutex, not ISR mutex) at the following three
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* state may cause OS death. So we use a extra _reent data instead
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* of task private reent data.
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*
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* But although at the state none of "taskSCHEDULER_RUNNING", exception
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* can cause CPU swicth context, then Locking mutex may cause OS death.
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* So we command that use ets_printf(ROM function) instead of "printf"
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* at exception and system kernal critical state.
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*/
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if (xPortInIsrContext()
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|| !xTaskGetCurrentTaskHandle()
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|| xTaskGetSchedulerState() != taskSCHEDULER_RUNNING)
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return &impure_data;
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/*
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* When scheduler starts, _global_impure_ptr = pxCurrentTCB->xNewLib_reent.
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*/
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#endif
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return _global_impure_ptr;
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}
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