Thread Termination During Shared Memory Deallocation
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Solution Overview
Problem
Existing systems face challenges in properly terminating threads that access shared memory segments before deallocating these segments, which can lead to system instability and memory leaks.
Innovation Solution
A system is implemented that causes threads accessing shared memory segments to terminate by executing a thread-terminating instruction after the memory region is marked as closed, ensuring that the threads do not attempt to access the shared memory segments after deallocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threads are allowed to continue accessing shared memory segments during deallocation, then thread execution continuity is maintained, but system stability deteriorates and memory leaks occur
Solution Approach 1:
The system performs preliminary actions by marking the memory region as closed and injecting thread-terminating instructions into threads before the actual deallocation of shared memory segments occurs. This ensures threads are terminated in advance, preventing them from accessing deallocated memory, thus maintaining system stability while enabling safe memory reclamation.
2Reliability
If thread termination instructions are injected into all threads, then proper thread termination is achieved, but system complexity increases
Solution Approach 1:
The system applies local quality by differentiating thread handling based on their execution state. Threads suspended during memory access operations receive thread-terminating instructions, while other threads are handled differently. This targeted approach ensures proper termination where needed without unnecessarily complicating the handling of all threads uniformly.
3Reliability
If the memory region is marked as closed before thread termination, then memory leak prevention is achieved, but thread execution is disrupted
Solution Approach 1:
The memory region is marked as closed in advance before thread termination occurs, establishing a protective state that prevents memory leaks. Thread-terminating instructions are subsequently injected to halt thread execution. This sequence ensures memory safety is established first, then thread execution is controlled to prevent access to the closed memory region.
Data Source
AI summary
A system causes threads that are accessing shared memory segments of a memory region to terminate execution in preparation for deallocating the shared memory segments from the memory region and reclaiming the memory region. The system marks the memory region as closed and then instructs each thread to suspend execution. Responsive to determining that a thread was suspended during execution of a function that includes a memory access operation, the system causes the thread to execute, upon resuming execution, a thread-terminating instruction that terminates the thread. After the threads are terminated, the system deallocates the shared memory segments from the memory region and reclaims the memory region.