70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "thread/event.hpp"
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#include "thread/monitor.hpp"
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#include "thread/semaphore.hpp"
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#include "tap.hpp"
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#include <atomic>
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#include <thread>
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///////////////////////////////////////////////////////////////////////////////
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// a single atomic integer wrapper that allows precise ordering of thread
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// entrance and exit for exact testing of thread interleavings.
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struct foo {
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foo ():
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enter (0),
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leave (0)
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{ ; }
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void
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inc (void) {
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enter.acquire ();
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++value;
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leave.release ();
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}
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std::atomic<int> value = 0;
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cruft::thread::semaphore enter;
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cruft::thread::semaphore leave;
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};
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///////////////////////////////////////////////////////////////////////////////
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int
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main ()
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{
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cruft::TAP::logger tap;
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cruft::thread::monitor<foo> obj;
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const auto &value = obj->value;
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auto &enter = obj->enter;
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auto &leave = obj->leave;
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std::thread t1 ([&] () { obj->inc (); });
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std::thread t2 ([&] () { obj->inc (); });
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tap.expect_eq (value, 0, "wrapped class was left initialised");
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enter.release ();
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leave.acquire ();
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tap.expect_eq (value, 1, "only one thread had access");
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enter.release ();
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leave.acquire ();
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tap.expect_eq (value, 2, "second thread got access");
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t1.join ();
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t2.join ();
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return tap.status ();
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}
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