Fix potential threading issue in LUTManager
- Locks pointer before checking for validity to prevent race condition
Signed-off-by: Mohammed Suhail Munshi <MohammedSuhail.Munshi@arm.com>
Change-Id: I6872b10d058ee7f3707ba641f44bb6116e26880a
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/10960
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/helpers/LUTManager.cpp b/src/core/helpers/LUTManager.cpp
index 2bf0098..2f1746e 100644
--- a/src/core/helpers/LUTManager.cpp
+++ b/src/core/helpers/LUTManager.cpp
@@ -45,16 +45,18 @@
std::shared_ptr<ActivationLayerInfo::LookupTable65536> LUTManager::get_lut_table(LUTInfo info)
{
- const auto itr = map_fp16.find(info);
- if (itr != map_fp16.end() && !itr->second.expired())
+ const auto itr = map_fp16.find(info);
+ auto s_ptr = (itr != map_fp16.end()) ? itr->second.lock() : nullptr; // nullptr if invalid or not found.
+ if (s_ptr != nullptr)
{
// Found and valid
- return itr->second.lock(); // Return weak ptr as shared ptr
+ return s_ptr; // Return weak ptr as shared ptr
}
else
{
// Not found, or pointer not valid
- const auto ptr = std::make_shared<ActivationLayerInfo::LookupTable65536>();
+ // We do not use make_shared to prevent the weak_ptr keeping the control block alive
+ std::shared_ptr<ActivationLayerInfo::LookupTable65536> ptr(new ActivationLayerInfo::LookupTable65536);
init_lut_fp16(ptr.get());
map_fp16[info] = ptr;
return ptr;