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lf-lang / reactor-c

A reactor runtime written in C
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Fixes to prevent memory leaks in RTI #446

Closed byeonggiljun closed 4 months ago

byeonggiljun commented 5 months ago

This PR resolves memory leaks from the RTI. I attached the output file from Valgrind. valgrind-out-before.txt

With this PR, most of the leakages have disappeared.

valgrind-out-after.txt

Specifically, now the function pqueue_tag_remove_up_to frees dynamically allocated elements. Also, memory allocated for storing each node's upstream and min_delays is explicitly freed when the RTI terminates.

Valgrind reports two remaining issues. The two threads shown below are not explicitly joined. https://github.com/lf-lang/reactor-c/blob/587a8f9498b69bc82f404e432f881d7bb0bcf383/core/federated/RTI/rti_remote.c#L666

This thread is created in the function handle_stop_request_message to set a timeout to wait for MSG_TYPE_STOP_REQUEST_REPLY messages. Thus, this thread cannot be joined in the function handle_stop_request_message and I didn't come up with joining this function.

https://github.com/lf-lang/reactor-c/blob/587a8f9498b69bc82f404e432f881d7bb0bcf383/core/federated/RTI/rti_remote.c#L1677

This thread is responsible for responding to erroneous connection requests. Thus, this thread should not be joined.

Summary by CodeRabbit

coderabbitai[bot] commented 5 months ago

Walkthrough

Recent updates in the core/federated/RTI/rti_remote.c and core/utils/pqueue_tag.c files include thread synchronization and memory management enhancements. Specifically, adjustments were made to thread joining and deallocation processes, and a new function call was employed to manage priority queue operations, thereby ensuring more robust and efficient execution flow.

Changes

File Change Summary
core/federated/RTI/rti_remote.c Added thread join for responder_thread, set all_federates_exited to true, adjusted memory deallocation in free_scheduling_nodes, and modified its declaration.
core/utils/pqueue_tag.c Replaced pqueue_tag_pop() with pqueue_tag_pop_tag() in the loop within pqueue_tag_remove_up_to to enhance priority queue operations.

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lhstrh commented 4 months ago

@edwardalee?