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Henrik RydgårdandClaude Sonnet 5
f72709feb0
Debugger windows (register list, disassembly view, memory view, breakpoint/ thread/module/stack lists, watch list) read CPU-thread-owned state directly from the GUI thread's WM_PAINT/list-fill handlers, racing against the CPU thread. Routing every read through Core_RunOnCPUThread would be too slow for something invoked continuously on paint/list-refresh. Add g_frameMutex (Core.h/Core.cpp), held by NativeFrame() only across the span where it actually touches that state (running the CPU, processing breakpoints, running the ImGui debugger) - not across input handling or the present/frame-pacing waits. Debugger windows now hold the same mutex while reading, giving synchronized reads without the round-trip cost of queuing to the CPU thread. CtrlRegisterList::onPaint() goes back to always reading live values (now safe under the lock) and grays them out by color alone while the core is running, rather than the earlier snapshot-caching approach. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Hqm11k99viLfbJm2MkH4BH