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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
This commit is contained in:
Stefan Eissing 2024-06-07 14:38:51 +02:00 • committed by Daniel Stenberg
parent 1424d507aa
commit 3841569ec8
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GPG key ID: 5CC908FDB71E12C2
10 changed files with 86 additions and 2 deletions
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8
lib/sendf.h
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@ -218,6 +218,7 @@ struct Curl_crtype {
struct Curl_creader *reader, curl_off_t offset);
CURLcode (*rewind)(struct Curl_easy *data, struct Curl_creader *reader);
CURLcode (*unpause)(struct Curl_easy *data, struct Curl_creader *reader);
bool (*is_paused)(struct Curl_easy *data, struct Curl_creader *reader);
void (*done)(struct Curl_easy *data,
struct Curl_creader *reader, int premature);
size_t creader_size; /* sizeof() allocated struct Curl_creader */
@ -268,6 +269,8 @@ CURLcode Curl_creader_def_rewind(struct Curl_easy *data,
struct Curl_creader *reader);
CURLcode Curl_creader_def_unpause(struct Curl_easy *data,
struct Curl_creader *reader);
bool Curl_creader_def_is_paused(struct Curl_easy *data,
struct Curl_creader *reader);
void Curl_creader_def_done(struct Curl_easy *data,
struct Curl_creader *reader, int premature);
@ -375,6 +378,11 @@ CURLcode Curl_creader_resume_from(struct Curl_easy *data, curl_off_t offset);
*/
CURLcode Curl_creader_unpause(struct Curl_easy *data);
/**
* Return TRUE iff any of the installed readers is paused.
*/
bool Curl_creader_is_paused(struct Curl_easy *data);
/**
* Tell all client readers that they are done.
*/