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 "test.h"
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#include <stdatomic.h>
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#include <stdlib.h>
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#include <unistd.h>
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struct LG_Transport
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{
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atomic_bool entered;
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atomic_bool armed;
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atomic_bool release;
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atomic_uint cancelCount;
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atomic_uint on;
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atomic_uint off;
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};
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static bool setActive(LG_Transport * transport, bool active)
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{
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atomic_fetch_add(active ? &transport->on : &transport->off, 1);
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atomic_store(&transport->entered, true);
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if (active)
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{
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/* Lose the first cancellation edge before arming the wait. */
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while (!atomic_load(&transport->cancelCount))
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usleep(1000);
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atomic_store(&transport->release, false);
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atomic_store(&transport->armed, true);
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while (!atomic_load(&transport->release))
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usleep(1000);
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}
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return !active || atomic_load(&transport->release);
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}
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static void cancelPending(LG_Transport * transport)
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{
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atomic_fetch_add(&transport->cancelCount, 1);
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if (atomic_load(&transport->armed))
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atomic_store(&transport->release, true);
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}
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static bool cancelled(void * opaque)
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{
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return *(const bool *)opaque;
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}
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static const LG_SwSurfaceOps ops =
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{
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.setActive = setActive,
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.cancelPending = cancelPending,
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};
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int main(void)
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{
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LG_Transport transport = { 0 };
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const bool stop = true;
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CHECK(!lgSwSurface_setActive(
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&ops, &transport, true, cancelled, (void *)&stop));
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CHECK(atomic_load(&transport.entered));
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CHECK(atomic_load(&transport.cancelCount) >= 2);
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CHECK(atomic_load(&transport.on) == 1);
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CHECK(atomic_load(&transport.off) == 1);
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atomic_store(&transport.entered, false);
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atomic_store(&transport.release, false);
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atomic_store(&transport.cancelCount, 0);
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CHECK(lgSwSurface_setActive(
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&ops, &transport, false, cancelled, (void *)&stop));
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CHECK(atomic_load(&transport.entered));
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CHECK(atomic_load(&transport.cancelCount) == 0);
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CHECK(atomic_load(&transport.off) == 2);
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return EXIT_SUCCESS;
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}
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