mirror of
https://github.com/verilator/verilator.git
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79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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//
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// Copyright 2018-2018 by Wilson Snyder. This program is free software; you can
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// redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License.
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// Version 2.0.
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//
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// Verilator is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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//*************************************************************************
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#include <atomic>
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#include <cstdio>
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#include <iostream>
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#include <unistd.h>
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#include "svdpi.h"
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//======================================================================
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#if defined(VERILATOR)
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# ifdef T_DPI_THREADS_COLLIDE
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# include "Vt_dpi_threads_collide__Dpi.h"
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# else
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# include "Vt_dpi_threads__Dpi.h"
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# endif
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#elif defined(VCS)
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# include "../vc_hdrs.h"
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#elif defined(CADENCE)
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# define NEED_EXTERNS
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#else
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# error "Unknown simulator for DPI test"
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#endif
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#ifdef NEED_EXTERNS
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extern "C" {
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extern void dpii_sys_task();
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extern int dpii_failure();
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}
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#endif
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//======================================================================
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struct state {
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std::atomic<bool> task_is_running;
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std::atomic<int> failure;
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state() : task_is_running(false)
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, failure(false) {}
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};
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static state st;
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void dpii_sys_task() {
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bool other_task_running = atomic_exchange(&st.task_is_running, true);
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if (other_task_running) {
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// Another task is running. This is a collision.
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st.failure = 1;
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std::cerr << "t_dpi_threads_c.cpp dpii_sys_task() saw threads collide.\n";
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} else {
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std::cerr << "t_dpi_threads_c.cpp dpii_sys_task() no collision. @" << &st.task_is_running << "\n";
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}
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// Spend some time in the DPI call, so that if we can have a collision
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// we probably will. Technically this is not guaranteed to detect every
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// race. However, one second is so much greater than the expected
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// runtime of everything else in the test, it really should pick up on
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// races just about all of the time.
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sleep(1);
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atomic_exchange(&st.task_is_running, false);
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}
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int dpii_failure() {
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return st.failure;
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}
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