385fe4d4b6
DOCS_PREVIEW= https://skia.org/?cl=1316123003 Review URL: https://codereview.chromium.org/1316123003
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "Test.h"
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#include "SkLazyPtr.h"
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#include "SkRunnable.h"
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#include "SkTaskGroup.h"
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namespace {
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struct CreateIntFromFloat {
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CreateIntFromFloat(float val) : fVal(val) {}
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int* operator()() const { return new int((int)fVal); }
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float fVal;
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};
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// As a template argument this must have external linkage.
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void custom_destroy(int* ptr) { *ptr = 99; }
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} // namespace
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DEF_TEST(LazyPtr, r) {
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// Basic usage: calls new int.
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SkLazyPtr<int> lazy;
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int* ptr = lazy.get();
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REPORTER_ASSERT(r, ptr);
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REPORTER_ASSERT(r, lazy.get() == ptr);
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// Advanced usage: calls a functor.
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SkLazyPtr<int> lazyFunctor;
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int* six = lazyFunctor.get(CreateIntFromFloat(6.4f));
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REPORTER_ASSERT(r, six);
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REPORTER_ASSERT(r, 6 == *six);
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// Just makes sure this is safe.
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SkLazyPtr<double> neverRead;
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// SkLazyPtr supports custom destroy methods.
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{
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SkLazyPtr<int, custom_destroy> customDestroy;
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ptr = customDestroy.get();
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// custom_destroy called here.
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}
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REPORTER_ASSERT(r, ptr);
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REPORTER_ASSERT(r, 99 == *ptr);
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// Since custom_destroy didn't actually delete ptr, we do now.
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delete ptr;
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}
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DEF_TEST(LazyPtr_Threaded, r) {
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static const int kRacers = 321;
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// Race to intialize the pointer by calling .get().
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SkLazyPtr<int> lazy;
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int* seen[kRacers];
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sk_parallel_for(kRacers, [&](int i) {
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seen[i] = lazy.get();
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});
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// lazy.get() should return the same pointer to all threads.
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for (int i = 1; i < kRacers; i++) {
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REPORTER_ASSERT(r, seen[i] != nullptr);
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REPORTER_ASSERT(r, seen[i] == seen[0]);
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}
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}
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