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Add comment about async signal safety for PR #70

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Antony Polukhin
2019-01-12 22:37:31 +03:00
parent 5c6740b680
commit 1ad62e582a
1 changed files with 3 additions and 0 deletions
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include/boost/stacktrace/detail/collect_unwind.ipp
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@@ -71,7 +71,10 @@ std::size_t this_thread_frames::collect(native_frame_ptr_t* out_frames, std::siz
skip += 1;
#if defined(BOOST_STACKTRACE_USE_LIBC_BACKTRACE_FUNCTION)
// According to https://opensource.apple.com/source/Libc/Libc-1272.200.26/gen/backtrace.c.auto.html
// it looks like the `::backtrace` is async signal safe.
frames_count = static_cast<size_t>(::backtrace(const_cast<void **>(out_frames), static_cast<int>(max_frames_count)));
// NOTE: There is no way to pass "skip" count to backtrace function so we need to perform left shift operation.
// If number of elements in result backtrace is >= max_frames_count then "skip" elements are wasted.
if (frames_count && skip) {