86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
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/*
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* Main-stack runner: the KiCad half of wx's nested-loop bounce
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* (pcbjam docs/features/async/19, 20 D3).
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*
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* A quasi-modal's nested event loop parks its whole stack for the dialog's
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* lifetime. When that stack is a TOOL coroutine's, the park suspends the
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* fiber's body where the fiber layer cannot see it: the stale-fiber guard
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* quarantines the fiber, then REFUSES its own resume, and the dialog stops
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* responding to clicks (only the titlebar x still works, because that path is
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* ungated). That is the Symbol Properties hang.
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*
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* wx detects "this nested loop is about to park on a non-main stack" — it can,
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* cheaply and exactly, by comparing a frame address against
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* emscripten_stack_get_base()/end() — but it must not know what a coroutine
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* is. So it calls this runner, and KiCad's TOOL_MANAGER moves the loop onto
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* the main stack via its own RunMainStack mechanism, which suspends the
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* coroutine the legitimate way: a fiber swap the layer records
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* (swap_suspended = true), so no quarantine, no refused resume.
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*
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* This lives in pcbjam's binding layer rather than in KiCad or wx precisely
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* because it is the only place that may know about both.
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*/
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#pragma once
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#include <wx/app.h>
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#include <eda_base_frame.h>
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#include <tool/tool_manager.h>
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#include <wx/wasm/private/mainstack.h>
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namespace pcbjam_main_stack
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{
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/**
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* Run aFunc on the main stack if a tool coroutine is currently active.
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*
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* Returns 1 when the body has been run (bounced, or run inline because there
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* was no coroutine to bounce off), 0 when there was nothing to run it with —
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* no frame or no tool manager — in which case wx parks in place exactly as it
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* did before this hook existed.
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*/
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inline int run_on_main_stack( void ( *aFunc )( void* ), void* aArg )
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{
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if( !wxTheApp )
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return 0;
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auto* frame = dynamic_cast<EDA_BASE_FRAME*>( wxTheApp->GetTopWindow() );
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if( !frame )
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return 0;
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TOOL_MANAGER* toolMgr = frame->GetToolManager();
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if( !toolMgr )
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return 0;
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// RunOnMainStackIfActiveTool runs the body inline when no coroutine is
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// running. Either way the body HAS run, so report it as handled — letting
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// wx fall through would run the nested loop a second time.
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bool ran = false;
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toolMgr->RunOnMainStackIfActiveTool(
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[aFunc, aArg, &ran]()
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{
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ran = true;
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aFunc( aArg );
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} );
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return ran ? 1 : 0;
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}
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/**
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* Installs at static-init time. Only stores a function pointer, so it is safe
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* before wx exists; every lookup above happens lazily per call, since frames
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* come and go. Included by more than one binding TU — setting the same pointer
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* twice is idempotent.
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*/
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struct INSTALLER
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{
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INSTALLER() { wxWasmSetMainStackRunner( &run_on_main_stack ); }
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};
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inline INSTALLER g_installer;
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} // namespace pcbjam_main_stack
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