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Support for dumping current PrettyStackTrace on SIGINFO (Ctrl-T)

Authored by jordan_rose on Jul 12 2019, 9:05 AM.

Description

Support for dumping current PrettyStackTrace on SIGINFO (Ctrl-T)

Support SIGINFO (and SIGUSR1 for POSIX purposes) to tell what
long-running jobs are doing, as inspired by BSD tools (including on
macOS), by dumping the current PrettyStackTrace.

This adds a new kind of signal handler for non-fatal "info" signals,
similar to the "interrupt" handler that already exists for SIGINT
(Ctrl-C). It then uses that handler to update a "generation count"
managed by the PrettyStackTrace infrastructure, which is then checked
whenever a PrettyStackTraceEntry is pushed or popped on each
thread. If the generation has changed---i.e. if the user has pressed
Ctrl-T---the stack trace is dumped, though unfortunately it can't
include the deepest entry because that one is currently being
constructed/destructed.

https://reviews.llvm.org/D63750

llvm-svn: 365911

Details

Committed
jordan_roseJul 12 2019, 9:05 AM
Parents
rG27ec195f391c: [AMDGPU] Fix DPP combiner check for exec modification
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