kkraus14 commented on code in PR #37040:
URL: https://github.com/apache/arrow/pull/37040#discussion_r1293773997
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cpp/src/arrow/device.h:
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@@ -102,26 +103,40 @@ class ARROW_EXPORT Device : public
std::enable_shared_from_this<Device>,
/// \brief EXPERIMENTAL: An object that provides event/stream sync primitives
///
- ///
+ /// This class is thread-safe.
class ARROW_EXPORT SyncEvent {
public:
virtual ~SyncEvent() = default;
/// @brief Block until sync event is completed.
- ///
- /// Should be a no-op for CPU devices.
- virtual Status wait() = 0;
+ Status wait() {
+ const std::lock_guard<std::mutex> lock(mx_);
+ wait_internal();
+ }
/// @brief Make the provided stream wait on the sync event.
///
/// Tells the provided stream that it should wait until the
/// synchronization event is completed without blocking the CPU.
/// @param stream Should be appropriate for the underlying device
- virtual Status stream_wait(void* stream) = 0;
+ Status stream_wait(void* stream) {
+ const std::lock_guard<std::mutex> lock(mx_);
+ stream_wait_internal(stream);
+ }
Review Comment:
Do we need to lock on these two APIs? I imagine it makes them non-trivially
more expensive, especially in the case where `wait()` could be a no-op?
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