bootloader: use Py_UnbufferedStdioFlag to enable unbuffered output #5597
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The frozen script periodically prints * character to a single line on the specified output stream (stdout or stderr) in either text or binary mode. Once the selected number of characters have been printed, end-of-transmission is signalled by 'E' character. The test itself is asynchronously reading the output of the spawned frozen script, and counting the recived * characters as long as the received buffer ends with *. In buffered mode, the whole E-terminated line is exepected to be received at once, while in unbuffered mode, each * character is expected to be received separately.
Setting Py_UnbufferedStdioFlag enables unbuffered stdio mode in the Python library. This enables unbuffered binary layer of stdout and stderr streams in all supported Python versions, while unbuffered text layer requires Python 3.7 or later.
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Setting
Py_UnbufferedStdioFlagenables unbuffered stdio mode in the Python library.This enables unbuffered binary layer of
stdoutand stderr streams in all supported Python versions, while unbuffered text layer requires Python 3.7 or later.Closes #1441.