tree f4089d9773e1c76e5eded9f9e3bafda75f0e03a9
parent 745f15eba97535c1b7894f81f6bc252e1a41e5d0
author Willy Tarreau <w@1wt.eu> 1541515821 +0100
committer Willy Tarreau <w@1wt.eu> 1541927917 +0100
encoding latin1

MEDIUM: stream: implement stream_buf_available()

This function replaces stream_res_available(), which is used as a callback
for the buffer allocator. It now carefully checks which stream interface
was blocked on a buffer allocation, tries to allocate the input buffer to
this stream interface, and wakes the task up once such a buffer was found.
It will automatically remove the SI_FL_WAIT_ROOM flag upon success since
the info this flag indicates becomes wrong as soon as the buffer is
allocated.

The code is still far from being perfect because if a call to si_cs_recv()
fails to allocate a buffer, we'll still end up passing via process_stream()
again, but this could be improved in the future by using finer-grained
wake-up notifications.