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new d0fa1763 Optimize shared_ptr assignment in DoublyBufferedData (#2981)
d0fa1763 is described below
commit d0fa17634e7c614f8481b21d5525611d618151e4
Author: Chen Chuanle <60637740+git...@users.noreply.github.com>
AuthorDate: Sat Jun 7 23:20:20 2025 +0800
Optimize shared_ptr assignment in DoublyBufferedData (#2981)
---
src/butil/containers/doubly_buffered_data.h | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)
diff --git a/src/butil/containers/doubly_buffered_data.h
b/src/butil/containers/doubly_buffered_data.h
index ff96a903..8ba54ac0 100644
--- a/src/butil/containers/doubly_buffered_data.h
+++ b/src/butil/containers/doubly_buffered_data.h
@@ -484,17 +484,15 @@ int DoublyBufferedData<T, TLS,
AllowBthreadSuspended>::Read(
// foreground instance, so during the read process, there is
// no need to lock mutex and bthread is allowed to be suspended.
w->BeginRead();
- int index = -1;
- ptr->_data = UnsafeRead(index);
- ptr->_index = index;
- w->AddRef(index);
- ptr->_w = w;
+ // UnsafeRead will update ptr->_index
+ ptr->_data = UnsafeRead(ptr->_index);
+ w->AddRef(ptr->_index);
w->BeginReadRelease();
} else {
w->BeginRead();
ptr->_data = UnsafeRead();
- ptr->_w = w;
}
+ ptr->_w.swap(w);
return 0;
}
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