Fix for std::atomic in variadic function when ACE_HAS_DUMP is defined. Fixes #2326.

[bbronk01]

Summary by CodeRabbit

• Bug Fixes
  • Enhanced system reliability in handling concurrent operations by updating internal thread interaction methods. This improvement reduces the risk of data inconsistencies during high-load activity and promotes more stable performance. Though these changes occur behind the scenes, they contribute to a smoother, more robust experience when managing simultaneous processes, ensuring overall stability for end-users.

[coderabbitai]

Walkthrough

In the ACE/ace/Barrier.cpp file, the dump method within the ACE_Sub_Barrier class has been updated. Instead of accessing running_threads_ directly, the code now calls this->running_threads_.load(), ensuring a thread-safe retrieval of its value. No other functional changes were made, and the public API remains the same.

Changes

File(s)	Change Summary
ACE/ace/Barrier.cpp	Updated the dump method in ACE_Sub_Barrier to use running_threads_.load() for thread-safe access

Poem

I’m just a bunny coding by,
Threads and loads now safer to spy,
With an atomic hop I make a tweak,
Ensuring sanity when threads speak,
In this code burrow, all’s aligned—oh my!
🐇✨

---

📜 Recent review details

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Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 94721e3 and fb6bd2d.

📒 Files selected for processing (1)

• ACE/ace/Barrier.cpp (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: Codacy Static Code Analysis

🔇 Additional comments (1)

ACE/ace/Barrier.cpp (1)

28-28:

❓ Verification inconclusive

LGTM! The change improves thread safety in the dump method.

The use of .load() ensures thread-safe access to the atomic variable in the dump method.

The other direct accesses to running_threads_ appear to be thread-safe as they are protected by mutex locks:

• In wait(): Protected by ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1)
• In shutdown(): Protected by ACE_GUARD_RETURN (ACE_Thread_Mutex, ace_mon, this->lock_, -1)

Let's verify the type of running_threads_ to confirm it's atomic:

---

🏁 Script executed:

#!/bin/bash
# Search for the declaration of running_threads_
ast-grep --pattern 'class ACE_Sub_Barrier {
  $$$
  $_running_threads_$_
  $$$
}'

Length of output: 254

---

🏁 Script executed:

#!/bin/bash
# Check for occurrences of "running_threads_" in the Barrier.cpp file to locate its declaration and usages.
grep -R "running_threads_" -n ACE/ace/Barrier.cpp

# Additionally, check for usage of std::atomic in Barrier.cpp to verify the atomic type of running_threads_
grep -R "std::atomic<" -n ACE/ace/Barrier.cpp

Length of output: 449

---

LGTM – but please verify the type declaration for running_threads_.

The change in the dump method to use .load() is an appropriate update to ensure thread-safe reading of the atomic variable for diagnostic output. Our review of the file shows that:

• The dump method now correctly calls .load() (line 28), which improves thread safety.
• Other accesses to running_threads_ (lines 92, 97, 104, 107, and 142) are within guarded sections (using mutex locks), so they remain thread-safe under the current design.

However, since our search in Barrier.cpp did not find a direct reference to std::atomic<...> for running_threads_, please verify (likely in the corresponding header file) that running_threads_ is indeed declared as an atomic type. Once that confirmation is provided, no further changes are necessary.

✨ Finishing Touches

• 📝 Generate Docstrings (Beta)

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