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The return value of term_data() is used as the return value from the GUI-terminal versions of the Seat output method, which means backends will take it to be the amount of standard-output data currently buffered, and exert back-pressure on the remote peer if it gets too big (e.g. by ceasing to extend the window in that particular SSH-2 channel). Historically, as a comment in term_data() explained, we always just returned 0 from that function, on the basis that we were processing all the terminal data through our terminal emulation code immediately, and never retained any of it in the buffer at all. If the terminal emulation code were to start running slowly, then it would slow down the _whole_ PuTTY system, due to single-threadedness, and back-pressure of a sort would be exerted on the remote by it simply failing to get round to reading from the network socket. But by the time we got back to the top level of term_data(), we'd have finished reading all the data we had, so it was still appropriate to return 0. That comment is still correct if you're thinking about the limiting factor on terminal data processing being the CPU usage in term_out(). But now that's no longer the whole story, because sometimes we leave data in term->inbuf without having processed it: during drag-selects in the terminal window, and (just introduced) while waiting for the response to a pending window resize request. For both those reasons, we _don't_ always have a buffer size of zero when we return from term_data(). So now that hole in our buffer size management is filled in: term_data() returns the true size of the remaining unprocessed terminal output, so that back-pressure will be exerted if the terminal is currently not consuming it. And when processing resumes and we start to clear our backlog, we call backend_unthrottle to let the backend know it can relax the back-pressure if necessary. |
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| .. | ||
| sclog | ||
| agentmulti.py | ||
| agenttest.py | ||
| agenttestdata.py | ||
| agenttestgen.py | ||
| colours.txt | ||
| cryptsuite.py | ||
| desref.py | ||
| display.txt | ||
| eccref.py | ||
| fuzzterm.c | ||
| lattrs.txt | ||
| list-accel.py | ||
| mpu-check.pl | ||
| numbertheory.py | ||
| primegen.py | ||
| scocols.txt | ||
| ssh.py | ||
| testcrypt-enum.h | ||
| testcrypt-func.h | ||
| testcrypt.c | ||
| testcrypt.py | ||
| testsc.c | ||
| testzlib.c | ||
| utf8.txt | ||
| vt100.txt | ||
| windowchange.py | ||