mirror of
https://github.com/gnif/LookingGlass.git
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85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/**
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* Looking Glass
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* Copyright © 2017-2026 The Looking Glass Authors
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* https://looking-glass.io
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include "sw_surface.h"
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#include "common/debug.h"
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#include "common/thread.h"
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#include "common/time.h"
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#include <stdatomic.h>
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struct SwSurfaceCall
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{
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const LG_SwSurfaceOps * ops;
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LG_Transport * transport;
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bool active;
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bool result;
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atomic_bool done;
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};
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static int swSurfaceCallThread(void * opaque)
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{
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struct SwSurfaceCall * call = opaque;
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call->result = call->ops->setActive(call->transport, call->active);
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atomic_store_explicit(&call->done, true, memory_order_release);
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return 0;
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}
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bool lgSwSurface_setActive(const LG_SwSurfaceOps * ops,
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LG_Transport * transport, bool active,
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LG_TransportCancelledFn cancelled, void * opaque)
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{
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if (!ops || !ops->setActive || !ops->cancelPending || !transport)
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return false;
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struct SwSurfaceCall call =
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{
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.ops = ops,
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.transport = transport,
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.active = active,
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};
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atomic_init(&call.done, false);
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LGThread * thread;
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if (!lgCreateThread("surfaceState", swSurfaceCallThread, &call, &thread))
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return false;
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bool cancelRequested = false;
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while (!atomic_load_explicit(&call.done, memory_order_acquire))
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{
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if (active && cancelled && cancelled(opaque))
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{
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cancelRequested = true;
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ops->cancelPending(transport);
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}
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nsleep(1000000U);
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}
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if (active && cancelled && cancelled(opaque))
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cancelRequested = true;
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if (!lgJoinThread(thread, NULL))
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{
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DEBUG_ERROR("Failed to join software surface state worker");
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return false;
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}
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if (active && cancelRequested)
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{
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/* The backend may complete successfully at the same instant cancellation
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* is observed. Leave it inactive before reporting the cancelled result. */
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if (!ops->setActive(transport, false))
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DEBUG_ERROR("Failed to deactivate a cancelled software surface");
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return false;
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}
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return call.result;
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}
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