[Bug gdb/30695] [gdb, tsan] FAIL: gdb.base/bg-exec-sigint-bp-cond.exp: no force memory write: SIGINT does not interrupt background execution

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30695

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
From https://www.gnu.org/software/libc/manual/html_node/Merged-Signals.html:
...
If multiple signals of the same type are delivered to your process before your
signal handler has a chance to be invoked at all, the handler may only be
invoked once, as if only a single signal had arrived. In effect, the signals
merge into one. This situation can arise when the signal is blocked, or in a
multiprocessing environment where the system is busy running some other
processes while the signals are delivered. This means, for example, that you
cannot reliably use a signal handler to count signals. The only distinction you
can reliably make is whether at least one signal has arrived since a given time
in the past. 
...

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