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docs: Add notes about thread safety and using heap from ISRs

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Closes https://github.com/espressif/esp-idf/issues/3768
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Angus Gratton 2019-07-12 11:09:00 +10:00 committed by Angus Gratton
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docs/en/api-reference/system/mem_alloc.rst
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@ -113,6 +113,13 @@ API Reference - Heap Allocation
.. include:: /_build/inc/esp_heap_caps.inc
Thread Safety
^^^^^^^^^^^^^
Heap functions are thread safe, meaning they can be called from different tasks simultaneously without any limitations.
It is technically possible to call ``malloc``, ``free``, and related functions from interrupt handler (ISR) context. However this is not recommended, as heap function calls may delay other interrupts. It is strongly recommended to refactor applications so that any buffers used by an ISR are pre-allocated outside of the ISR. Support for calling heap functions from ISRs may be removed in a future update.
Heap Tracing & Debugging
------------------------