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| author | Andrew Leech <andrew@alelec.net> | 2020-06-01 16:16:25 +1000 |
|---|---|---|
| committer | Damien George <damien.p.george@gmail.com> | 2020-06-02 15:56:34 +1000 |
| commit | e54626f4c1b5cb4de0b5dc86d820bb36c1d6499f (patch) | |
| tree | b798bffcfcba139f22f66ff1c72dab070b8e26ca /docs/reference | |
| parent | 8e591d412a9922d71629f4fea74954d547f0c955 (diff) | |
docs/reference: Add note about multiple exceptions when heap is locked.
Diffstat (limited to 'docs/reference')
| -rw-r--r-- | docs/reference/isr_rules.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/reference/isr_rules.rst b/docs/reference/isr_rules.rst index 57690ac21..7f466ab42 100644 --- a/docs/reference/isr_rules.rst +++ b/docs/reference/isr_rules.rst @@ -43,6 +43,11 @@ for the purpose. Debugging is simplified if the following code is included in an import micropython micropython.alloc_emergency_exception_buf(100) +The emergency exception buffer can only hold one exception stack trace. This means that if a second exception is +thrown during the handling of an exception while the heap is locked, that second exception's stack trace will +replace the original one - even if the second exception is cleanly handled. This can lead to confusing exception +messages if the buffer is later printed. + Simplicity ~~~~~~~~~~ |