87 lines
1.8 KiB
C++
87 lines
1.8 KiB
C++
/*
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* \brief Test pseudo-parallel use of FPU if available
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* \author Martin Stein
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* \date 2014-04-29
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*/
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/*
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* Copyright (C) 2012-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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/* Genode includes */
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#include <base/component.h>
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#include <base/heap.h>
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#include <base/log.h>
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#include <base/thread.h>
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using namespace Genode;
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class Fpu_user : public Thread
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{
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private:
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float _x;
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Signal_transmitter _st;
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Semaphore & _sem;
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void _calc(float volatile & x, float volatile & y)
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{
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for (unsigned j = 0; j < 100; j++) {
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x *= (y * 1.357);
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x /= (y * 1.246);
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}
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}
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public:
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Fpu_user(Env & env, float x, Signal_context_capability c, Semaphore &s)
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: Thread(env, "fpu_user", sizeof(size_t)*2048), _x(x), _st(c), _sem(s) {
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start(); }
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void entry()
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{
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log("FPU user started");
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enum { TRIALS = 1000 };
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for (unsigned i = 0; i < TRIALS; i++) {
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float volatile a = _x + (float)i * ((float)1 / TRIALS);
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float volatile b = _x + (float)i * ((float)1 / TRIALS);
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float volatile c = _x;
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_calc(a, c);
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_calc(b, c);
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if (a != b) {
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error("calculation error");
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break;
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}
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}
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_sem.up();
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_st.submit();
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}
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};
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struct Main
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{
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enum { FPU_USERS = 10 };
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Semaphore sem { };
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Env & env;
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Heap heap { env.ram(), env.rm() };
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Signal_handler<Main> handler { env.ep(), *this, &Main::handle };
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Main(Env & env) : env(env) {
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for (unsigned i = 0; i < FPU_USERS; i++)
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new (heap) Fpu_user(env, (i + 1) * 1.234, handler, sem); }
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void handle() {
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if (sem.cnt() >= FPU_USERS) log("test done"); }
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};
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void Component::construct(Genode::Env & env) {
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static Main main(env); }
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