Tom Tromey 307733cc0f Let user C-c when waiting for DWARF index finalization ...

In PR gdb/29854, Simon pointed out that it would be good to be able to
use C-c when the DWARF cooked index is waiting for finalization.  The
idea here is to be able to interrupt a command like "break" -- not to
stop the finalization process itself, which runs in a worker thread.

This patch implements this idea, by changing the index wait functions
to, by default, allow a quit.  Polling is done, because there doesn't
seem to be a better way to interrupt a wait on a std::future.

For v2, I realized that the thread compatibility code in thread-pool.h
also needed an update.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29854

2023-02-09 07:21:52 -07:00

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