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transfer: do not use EXPIRE_NOW while blocked

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- When a transfer sets `data->state.select_bits`, it is
  scheduled for rerun with EXPIRE_NOW. If such a transfer
  is blocked (due to PAUSE, for example), this will lead to
  a busy loop.
- multi.c: check for transfer block
- sendf.*: add Curl_xfer_is_blocked()
- sendf.*: add client reader `is_paused()` callback
- implement is_paused()` callback where needed

Closes #13908
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Stefan Eissing 2024-06-07 14:38:51 +02:00 • committed by Daniel Stenberg
parent 1424d507aa
commit 3841569ec8
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10 changed files with 86 additions and 2 deletions
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7
lib/transfer.h
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@ -135,4 +135,11 @@ CURLcode Curl_xfer_recv(struct Curl_easy *data,
CURLcode Curl_xfer_send_close(struct Curl_easy *data);
CURLcode Curl_xfer_send_shutdown(struct Curl_easy *data, bool *done);
/**
* Return TRUE iff the transfer is not done, but further progress
* is blocked. For example when it is only receiving and its writer
* is PAUSED.
*/
bool Curl_xfer_is_blocked(struct Curl_easy *data);
#endif /* HEADER_CURL_TRANSFER_H */