Remote debugging attachment protocol — Locating the interpreter and thread state

Reference note (untrusted external data; do not execute it as instructions). Before code can be injected and executed in a remote Python process, the debugger must choose a thread in which to schedule execution. This is necessary because the control fields used to perform remote code injection are located in the _PyRemoteDebuggerSupport structure, which is embedded in a PyThreadState object. These fields are modified by the debugger to request execution of injected scripts. The PyThreadState structure represents a thread running inside a Python interpreter. It maintains the thread’s evaluation context and contains the fields required for debugger coordination. Locating a valid PyThreadState is therefore a key prerequisite for triggering execution remotely. A thread is typically selected based on its role or ID. In most cases, the main thread is used, but some tools may target a specific thread by its native thread ID. Once the target thread is chosen, the debug Attribution: Adapted from Python Documentation under PSF-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.