Philip Withnall 7b18e6205a gthreadedresolver: Switch to using a separate thread pool
Rather than running lookups in the global shared thread pool belonging
to `GTask`, run them in a private thread pool.

This is needed because the global shared thread pool is constrained to
only 14 threads. If there are 14 ongoing calls to
`g_task_run_in_thread()` from any library/code in the process, and then
one of them asks to do a DNS lookup, the lookup will block forever.

Under certain circumstances, particularly where there are a couple of
deep chains of dependent tasks running with `g_task_run_in_thread()`,
this can livelock the program.

Since `GResolver` is likely to be called as a frequent leaf call in
certain workloads, and in particular there are likely to be several
lookups requested at the same time, it makes sense to move resolver
lookups to a private thread pool.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
2023-04-27 12:23:25 +01:00
..
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