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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkOnce.h"
#include "SkThreadPool.h"
#include "Test.h"
static void add_five(int* x) {
*x += 5;
}
DEF_TEST(SkOnce_Singlethreaded, r) {
int x = 0;
SK_DECLARE_STATIC_ONCE(once);
// No matter how many times we do this, x will be 5.
SkOnce(&once, add_five, &x);
SkOnce(&once, add_five, &x);
SkOnce(&once, add_five, &x);
SkOnce(&once, add_five, &x);
SkOnce(&once, add_five, &x);
REPORTER_ASSERT(r, 5 == x);
}
struct AddFour { void operator()(int* x) { *x += 4; } };
DEF_TEST(SkOnce_MiscFeatures, r) {
// Tests that we support functors and explicit SkOnceFlags.
int x = 0;
SkOnceFlag once = SK_ONCE_INIT;
SkOnce(&once, AddFour(), &x);
SkOnce(&once, AddFour(), &x);
SkOnce(&once, AddFour(), &x);
REPORTER_ASSERT(r, 4 == x);
}
static void add_six(int* x) {
*x += 6;
}
class Racer : public SkRunnable {
public:
SkOnceFlag* once;
int* ptr;
virtual void run() SK_OVERRIDE {
SkOnce(once, add_six, ptr);
}
};
DEF_TEST(SkOnce_Multithreaded, r) {
const int kTasks = 16, kThreads = 4;
// Make a bunch of tasks that will race to be the first to add six to x.
Racer racers[kTasks];
SK_DECLARE_STATIC_ONCE(once);
int x = 0;
for (int i = 0; i < kTasks; i++) {
racers[i].once = &once;
racers[i].ptr = &x;
}
// Let them race.
SkThreadPool pool(kThreads);
for (int i = 0; i < kTasks; i++) {
pool.add(&racers[i]);
}
pool.wait();
// Only one should have done the +=.
REPORTER_ASSERT(r, 6 == x);
}
// Test that the atExit option works.
static int gToDecrement = 1;
static void noop(int) {}
static void decrement() { gToDecrement--; }
static void checkDecremented() { SkASSERT(gToDecrement == 0); }
DEF_TEST(SkOnce_atExit, r) {
atexit(checkDecremented);
SK_DECLARE_STATIC_ONCE(once);
SkOnce(&once, noop, 0, decrement);
}
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