199ba8e19b
Like all our other SK_DECLARE_STATIC_*, it's usually not a thread-safe
thing to put inside a function. Adding namespace {} prevents that
syntactically.
Needs https://codereview.chromium.org/841263004/ to land first.
BUG=chromium:447890
No public API changes.
TBR=reed@google.com
Review URL: https://codereview.chromium.org/806473006
82 lines
1.6 KiB
C++
82 lines
1.6 KiB
C++
/*
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* Copyright 2013 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 "SkOnce.h"
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#include "SkRunnable.h"
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#include "SkTaskGroup.h"
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#include "Test.h"
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static void add_five(int* x) {
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*x += 5;
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}
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SK_DECLARE_STATIC_ONCE(st_once);
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DEF_TEST(SkOnce_Singlethreaded, r) {
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int x = 0;
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// No matter how many times we do this, x will be 5.
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SkOnce(&st_once, add_five, &x);
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SkOnce(&st_once, add_five, &x);
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SkOnce(&st_once, add_five, &x);
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SkOnce(&st_once, add_five, &x);
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SkOnce(&st_once, add_five, &x);
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REPORTER_ASSERT(r, 5 == x);
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}
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static void add_six(int* x) {
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*x += 6;
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}
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namespace {
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class Racer : public SkRunnable {
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public:
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SkOnceFlag* once;
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int* ptr;
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void run() SK_OVERRIDE {
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SkOnce(once, add_six, ptr);
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}
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};
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} // namespace
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SK_DECLARE_STATIC_ONCE(mt_once);
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DEF_TEST(SkOnce_Multithreaded, r) {
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const int kTasks = 16;
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// Make a bunch of tasks that will race to be the first to add six to x.
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Racer racers[kTasks];
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int x = 0;
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for (int i = 0; i < kTasks; i++) {
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racers[i].once = &mt_once;
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racers[i].ptr = &x;
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}
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// Let them race.
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SkTaskGroup tg;
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for (int i = 0; i < kTasks; i++) {
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tg.add(&racers[i]);
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}
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tg.wait();
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// Only one should have done the +=.
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REPORTER_ASSERT(r, 6 == x);
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}
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static int gX = 0;
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static void inc_gX() { gX++; }
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SK_DECLARE_STATIC_ONCE(noarg_once);
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DEF_TEST(SkOnce_NoArg, r) {
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SkOnce(&noarg_once, inc_gX);
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SkOnce(&noarg_once, inc_gX);
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SkOnce(&noarg_once, inc_gX);
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REPORTER_ASSERT(r, 1 == gX);
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}
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