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| author | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-12-29 00:07:06 +0000 |
|---|---|---|
| committer | Ian Lance Taylor <ian@gcc.gnu.org> | 2018-12-29 00:07:06 +0000 |
| commit | e20bfbd18e64b8ab9428aa518b5d7b74a73461d9 (patch) | |
| tree | a5200fb4bd7b40981b58590f089defa85c251512 /libgo/runtime/runtime.h | |
| parent | 50bec22834e0b147fca92bea80501bccc309ce4d (diff) | |
| download | gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.zip gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.tar.gz gcc-e20bfbd18e64b8ab9428aa518b5d7b74a73461d9.tar.bz2 | |
runtime: prevent deadlock when profiling signal arrives in stack scan
Precise stack scan needs to unwind the stack. When it is
unwinding the stack, if a profiling signal arrives, which also
does a traceback, it may deadlock in dl_iterate_phdr. Prevent
this deadlock by setting up runtime_in_callers before traceback.
Reviewed-on: https://go-review.googlesource.com/c/155766
From-SVN: r267457
Diffstat (limited to 'libgo/runtime/runtime.h')
| -rw-r--r-- | libgo/runtime/runtime.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/libgo/runtime/runtime.h b/libgo/runtime/runtime.h index 21921ec..9f6e251 100644 --- a/libgo/runtime/runtime.h +++ b/libgo/runtime/runtime.h @@ -515,3 +515,9 @@ bool runtime_usestackmaps; bool probestackmaps(void) __asm__("runtime.probestackmaps"); + +// This is set to non-zero when calling backtrace_full. This is used +// to avoid getting hanging on a recursive lock in dl_iterate_phdr on +// older versions of glibc when a SIGPROF signal arrives while +// collecting a backtrace. +extern uint32 __go_runtime_in_callers; |