From ef08d0dbc99db8c4620512e92bfb3154282eb5d3 Mon Sep 17 00:00:00 2001
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From: Andrew Morrow <acm@mongodb.com>
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Date: Wed, 15 Sep 2021 15:23:42 -0400
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Subject: [PATCH] SERVER-59459 With glibc-2.34, MINSIGSTKSZ is no longer a
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constant
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[Retrieved (and backported) from:
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https://github.com/mongodb/mongo/commit/ef08d0dbc99db8c4620512e92bfb3154282eb5d3]
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Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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---
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src/mongo/stdx/thread.h | 14 ++++++++++----
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1 file changed, 10 insertions(+), 4 deletions(-)
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diff --git a/src/mongo/stdx/thread.h b/src/mongo/stdx/thread.h
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index 7b15bb561bd9..6f1e16cdeb36 100644
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--- a/src/mongo/stdx/thread.h
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+++ b/src/mongo/stdx/thread.h
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@@ -76,11 +76,19 @@ class SigAltStackController {
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}
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private:
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+ static size_t _getStackSize() {
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+ // It would be nice for this to be a constexpr, but
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+ // MINSIGSTKSZ became a macro that invoked `sysconf` in glibc
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+ // 2.34.
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+ static const std::size_t kMinSigStkSz = MINSIGSTKSZ;
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+ return std::max(kMongoMinSignalStackSize, kMinSigStkSz);
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+ }
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+
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void _install() const {
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stack_t ss;
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ss.ss_sp = _stackStorage.get();
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ss.ss_flags = 0;
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- ss.ss_size = kStackSize;
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+ ss.ss_size = _getStackSize();
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if (sigaltstack(&ss, nullptr)) {
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abort();
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}
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@@ -107,9 +115,7 @@ class SigAltStackController {
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// ( https://jira.mongodb.org/secure/attachment/233569/233569_stacktrace-writeup.txt )
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static constexpr std::size_t kMongoMinSignalStackSize = std::size_t{64} << 10;
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- static constexpr std::size_t kStackSize =
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- std::max(kMongoMinSignalStackSize, std::size_t{MINSIGSTKSZ});
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- std::unique_ptr<std::byte[]> _stackStorage = std::make_unique<std::byte[]>(kStackSize);
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+ std::unique_ptr<std::byte[]> _stackStorage = std::make_unique<std::byte[]>(_getStackSize());
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#else // !MONGO_HAS_SIGALTSTACK
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auto makeInstallGuard() const {
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