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* [gcc r11-8537] libstd++: Only support atomic_ref::wait tests which are always lockfree
@ 2021-06-09 20:47 Thomas Rodgers
0 siblings, 0 replies; only message in thread
From: Thomas Rodgers @ 2021-06-09 20:47 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:fe28c123dbdbff41a8e58299335c8b320856cdcd
commit r11-8537-gfe28c123dbdbff41a8e58299335c8b320856cdcd
Author: Thomas Rodgers <rodgert@appliantology.com>
Date: Wed Jun 9 13:44:31 2021 -0700
libstd++: Only support atomic_ref::wait tests which are always lockfree
Fixes a regression on arm32 targets.
libstdc++-v3/ChangeLog:
* testsuite/29_atomics/atomic_ref/wait_notify.cc: Guard
test logic with constexpr check for is_always_lock_free.
(cherry picked from commit eb3a3bb8ce4ce2420919d03a3e9f9a2a4297c4d3)
Diff:
---
.../testsuite/29_atomics/atomic_ref/wait_notify.cc | 25 ++++++++++++----------
1 file changed, 14 insertions(+), 11 deletions(-)
diff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc
index 003b86c85d0..b75e27617f7 100644
--- a/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc
+++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc
@@ -30,17 +30,20 @@ template<typename S>
void
test (S va, S vb)
{
- S aa{ va };
- S bb{ vb };
- std::atomic_ref<S> a{ aa };
- a.wait(bb);
- std::thread t([&]
- {
- a.store(bb);
- a.notify_one();
- });
- a.wait(aa);
- t.join();
+ if constexpr (std::atomic_ref<S>::is_always_lock_free)
+ {
+ S aa{ va };
+ S bb{ vb };
+ std::atomic_ref<S> a{ aa };
+ a.wait(bb);
+ std::thread t([&]
+ {
+ a.store(bb);
+ a.notify_one();
+ });
+ a.wait(aa);
+ t.join();
+ }
}
int
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