release Addressing Core Crashes When Canceling Server Timers in C++

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An issue often encountered in server management is the occurrence of core crashes when attempting to cancel timers. This situation arises because of the improper handling of iterators when removing timers from a map. Specifically, the iterator may increase two times due to the call to the erase() function and subsequently increase again upon entering a new loop iteration. This guide outlines a solution to effectively tackle this problem by collecting the timers to be removed and processing them after the completion of the loop.

Understanding the Issue

The issue tends to manifest after upgrading to C++11 or a newer version. The symptoms include instability when attempting to manage server timers, necessitating a careful approach to how timers are deleted and managed within the code.

Steps to Resolve the Timer Cancellation Issue

To fix the core crash in the CancelServerTimers function, follow these steps to update the questmanager.cpp file.

1. Locate the Function
   Open questmanager.cpp and find the following function:

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2. Modify the Function
   Now, enhance the function by collecting the timers to be removed and ensuring that you manage the iterators correctly without causing a crash. Here is a suggested update to the function:

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Explanation of Changes

• Iterator Management: The function now utilizes an iterator to traverse the m_mapServerTimer, removing entries as needed while ensuring that the iterator remains valid and does not advance incorrectly after an erase().
• Immediate Deletion: By deleting the timer immediately inside the loop, the code avoids the need for additional cleanup steps afterward, thus reducing potential errors related to managing temporary storage.

Conclusion

This update should greatly reduce the chance of core crashes when canceling server timers. By addressing the management of iterators and the proper timing of deletions, stability increases significantly. As always, after implementing code changes, thorough testing is essential to ensure everything operates smoothly.