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//===--- LockingHelpers.h - Utilities to help test locks ------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2020 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#ifndef LOCKING_HELPERS_H
#define LOCKING_HELPERS_H
#include "ThreadingHelpers.h"
// Test that a Mutex object can be locked and unlocked from a single thread
template <typename M>
void basicLockable(M &mutex) {
// We can lock, unlock, lock and unlock an unlocked lock
mutex.lock();
mutex.unlock();
mutex.lock();
mutex.unlock();
}
// Test that a Mutex object's try_lock() method works.
template <typename M>
void tryLockable(M &mutex) {
bool ret;
// We can lock an unlocked lock
ret = mutex.try_lock();
ASSERT_TRUE(ret);
// We cannot lock a locked lock
ret = mutex.try_lock();
#if SWIFT_THREADING_NONE
// Noop since none threading mode always succeeds getting lock
(void)ret;
#else
ASSERT_FALSE(ret);
#endif
mutex.unlock();
}
// Test that a Mutex object can be locked and unlocked
template <typename M>
void basicLockableThreaded(M &mutex) {
int count1 = 0;
int count2 = 0;
threadedExecute(10, [&](int) {
for (int j = 0; j < 50; ++j) {
mutex.lock();
auto count = count2;
count1++;
count2 = count + 1;
mutex.unlock();
}
});
ASSERT_EQ(count1, 500);
ASSERT_EQ(count2, 500);
}
#if SWIFT_THREADING_NONE
template <typename M>
void lockableThreaded(M &mutex) {
// Noop since none threading mode always succeeds getting lock
}
#else
// More extensive tests
template <typename M>
void lockableThreaded(M &mutex) {
mutex.lock();
threadedExecute(5, [&](int) { ASSERT_FALSE(mutex.try_lock()); });
mutex.unlock();
threadedExecute(1, [&](int) {
ASSERT_TRUE(mutex.try_lock());
mutex.unlock();
});
int count1 = 0;
int count2 = 0;
threadedExecute(10, [&](int) {
for (int j = 0; j < 50; ++j) {
if (mutex.try_lock()) {
auto count = count2;
count1++;
count2 = count + 1;
mutex.unlock();
} else {
j--;
}
}
});
ASSERT_EQ(count1, 500);
ASSERT_EQ(count2, 500);
}
#endif
// Test a scoped lock implementation
template <typename SL, typename M>
void scopedLockThreaded(M &mutex) {
int count1 = 0;
int count2 = 0;
threadedExecute(10, [&](int) {
for (int j = 0; j < 50; ++j) {
SL guard(mutex);
auto count = count2;
count1++;
count2 = count + 1;
}
});
ASSERT_EQ(count1, 500);
ASSERT_EQ(count2, 500);
}
// Test a scoped unlock nested in a scoped lock
template <typename SL, typename SU, typename M>
void scopedUnlockUnderScopedLockThreaded(M &mutex) {
int count1 = 0;
int count2 = 0;
int badCount = 0;
threadedExecute(10, [&](int) {
for (int j = 0; j < 50; ++j) {
SL guard(mutex);
{
SU unguard(mutex);
badCount++;
}
auto count = count2;
count1++;
count2 = count + 1;
}
});
ASSERT_EQ(count1, 500);
ASSERT_EQ(count2, 500);
}
// Test a critical section
template <typename M>
void criticalSectionThreaded(M &mutex) {
int count1 = 0;
int count2 = 0;
threadedExecute(10, [&](int) {
for (int j = 0; j < 50; ++j) {
mutex.withLock([&] {
auto count = count2;
count1++;
count2 = count + 1;
});
}
});
ASSERT_EQ(count1, 500);
ASSERT_EQ(count2, 500);
}
#endif
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