Non-blocking send#160
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zuiderkwast merged 7 commits intoEricsson:single-process-clientfrom Apr 1, 2026
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Use send_timeout 0. If send returns timeout, it has still queued all the data for sending later. When this happens, backoff and don't send more to the socket until the pending commands have got replies from the server. Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>
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Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>
Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>
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Related discussion about this behavior of the inet driver: |
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LGTM, seems to be helpful
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Hi i think most of it looks good, just have a small comment in ered_client_tests.erl.
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Some more context. If we use blocking send, the process can become unresponsive and we can get a deadlock. See the discussion here: #157 (comment) |
Co-authored-by: Hippo <44473866+WilliamVoong@users.noreply.github.com>
…blocking-send # Conflicts: # src/ered_client.erl
Parametrize send_backoff_t with a Transport argument (gen_tcp or ssl)
and run both variants. The TLS variant is skipped on OTP 28.0 .. 28.4
(ssl 11.2.0 .. 11.5.2) where {send_timeout, 0} incorrectly closes the
ssl socket on timeout. This was fixed in ssl-11.5.3 (OTP-20018).
Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech>
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Use send_timeout 0. If send returns timeout, it has still queued all the data for sending later. When this happens, backoff and don't send more to the socket until the pending commands have got replies from the server. This requires that gen_tcp is used with the inet backend (the default) and not the socket backend. With TLS, this approach works in older OTP versions, but it was broken for TLS in OTP 28.0 - 28.4, but fixed again in 28.4.1 (OTP-20018). If we need to support these OTP versions, or if we want to suppor gen_tcp with the socket backend or the socket module directly, we can implement more variants later. --------- Signed-off-by: Viktor Söderqvist <viktor.soderqvist@est.tech> Co-authored-by: Hippo <44473866+WilliamVoong@users.noreply.github.com>
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Use send_timeout 0. If send returns timeout, it has still queued all the data for sending later. When this happens, backoff and don't send more to the socket until the pending commands have got replies from the server. This requires that gen_tcp is used with the inet backend (the default) and not the socket backend.
With TLS, this approach works in older OTP versions, but it was broken for TLS in OTP 28.0 - 28.4, but fixed again in 28.4.1 (OTP-20018).
If we need to support these OTP versions, or if we want to suppor gen_tcp with the socket backend or the socket module directly, we can implement more variants later.