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Merge "Fix compare_exchange_weak tests to allow spurious failure"

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Hans Boehm 2017-04-06 01:02:28 +00:00 committed by Gerrit Code Review
commit e06c69d073
1 changed files with 19 additions and 5 deletions
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24
tests/stdatomic_test.cpp
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@ -116,20 +116,34 @@ TEST(stdatomic, atomic_compare_exchange) {
atomic_store(&i, 123); atomic_store(&i, 123);
expected = 123; expected = 123;
ASSERT_TRUE(atomic_compare_exchange_strong_explicit(&i, &expected, 456, memory_order_relaxed, memory_order_relaxed)); ASSERT_TRUE(atomic_compare_exchange_strong_explicit(&i, &expected, 456, memory_order_relaxed,
ASSERT_FALSE(atomic_compare_exchange_strong_explicit(&i, &expected, 456, memory_order_relaxed, memory_order_relaxed)); memory_order_relaxed));
ASSERT_FALSE(atomic_compare_exchange_strong_explicit(&i, &expected, 456, memory_order_relaxed,
memory_order_relaxed));
ASSERT_EQ(456, expected); ASSERT_EQ(456, expected);
atomic_store(&i, 123); atomic_store(&i, 123);
expected = 123; expected = 123;
ASSERT_TRUE(atomic_compare_exchange_weak(&i, &expected, 456)); int iter_count = 0;
do {
++iter_count;
ASSERT_LT(iter_count, 100); // Arbitrary limit on spurious compare_exchange failures.
ASSERT_EQ(expected, 123);
} while(!atomic_compare_exchange_weak(&i, &expected, 456));
ASSERT_FALSE(atomic_compare_exchange_weak(&i, &expected, 456)); ASSERT_FALSE(atomic_compare_exchange_weak(&i, &expected, 456));
ASSERT_EQ(456, expected); ASSERT_EQ(456, expected);
atomic_store(&i, 123); atomic_store(&i, 123);
expected = 123; expected = 123;
ASSERT_TRUE(atomic_compare_exchange_weak_explicit(&i, &expected, 456, memory_order_relaxed, memory_order_relaxed)); iter_count = 0;
ASSERT_FALSE(atomic_compare_exchange_weak_explicit(&i, &expected, 456, memory_order_relaxed, memory_order_relaxed)); do {
++iter_count;
ASSERT_LT(iter_count, 100);
ASSERT_EQ(expected, 123);
} while(!atomic_compare_exchange_weak_explicit(&i, &expected, 456, memory_order_relaxed,
memory_order_relaxed));
ASSERT_FALSE(atomic_compare_exchange_weak_explicit(&i, &expected, 456, memory_order_relaxed,
memory_order_relaxed));
ASSERT_EQ(456, expected); ASSERT_EQ(456, expected);
} }