xref: /TaskScheduler/SchedulerTests/Tests/FiberTests.cpp (revision 5786033a)

// The MIT License (MIT)
//
// 	Copyright (c) 2015 Sergey Makeev, Vadim Slyusarev
//
// 	Permission is hereby granted, free of charge, to any person obtaining a copy
// 	of this software and associated documentation files (the "Software"), to deal
// 	in the Software without restriction, including without limitation the rights
// 	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// 	copies of the Software, and to permit persons to whom the Software is
// 	furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
// 	all copies or substantial portions of the Software.
//
// 	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// 	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// 	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// 	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// 	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// 	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// 	THE SOFTWARE.

#include "Tests.h"
#include <UnitTest++.h>
#include <MTScheduler.h>

#ifdef MT_THREAD_SANITIZER
	#define SMALLEST_STACK_SIZE (566656)
#else
	#define SMALLEST_STACK_SIZE (32768)
#endif

int64 startTime = 0;
int64 endTime = 0;


SUITE(FiberTests)
{
	MT::Atomic32<int32> counter(0);
	MT::Fiber* fiberMain = nullptr;

	void FiberFunc( void* userData )
	{
		CHECK_EQUAL(0, counter.Load());
		counter.IncFetch();

		MT::Fiber* currentFiber = (MT::Fiber*)userData;
		MT::Fiber::SwitchTo(*currentFiber, *fiberMain);

		CHECK_EQUAL(2, counter.Load());
		counter.IncFetch();

		MT::Fiber::SwitchTo(*currentFiber, *fiberMain);
	}

	void FiberMain(void* userData)
	{
		endTime = MT::GetTimeMicroSeconds();
		uint32 microsecondsFromThreadToFiber = (uint32)(endTime - startTime);
		printf("%d us to convert from thread to fiber\n", microsecondsFromThreadToFiber);

		MT_UNUSED(userData);

		MT::Fiber fiber1;

		fiber1.Create(SMALLEST_STACK_SIZE, FiberFunc, &fiber1);

		MT::Fiber::SwitchTo(*fiberMain, fiber1);

		CHECK_EQUAL(1, counter.Load());
		counter.IncFetch();

		MT::Fiber::SwitchTo(*fiberMain, fiber1);

		CHECK_EQUAL(3, counter.Load());

		fiberMain = nullptr;

        printf("FiberMain - done\n");
	}



TEST(FiberSimpleTest)
{
	// Two fibers from same thread
	MT::Fiber fiber1;
	fiberMain = &fiber1;
	counter.Store(0);
	startTime = MT::GetTimeMicroSeconds();
	fiberMain->CreateFromCurrentThreadAndRun(FiberMain, nullptr);

	// CreateFromCurrentThreadAndRun from same fiber called twice for same fiber
	fiberMain = &fiber1;
	counter.Store(0);
	startTime = MT::GetTimeMicroSeconds();
	fiberMain->CreateFromCurrentThreadAndRun(FiberMain, nullptr);


	MT::Fiber fiber2;
	fiberMain = &fiber2;
	counter.Store(0);
	startTime = MT::GetTimeMicroSeconds();
	fiberMain->CreateFromCurrentThreadAndRun(FiberMain, nullptr);

    printf("Fiber test done\n");
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}