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Revert "Remove dead code."

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This reverts commit a36b73f745.
This commit is contained in:
Bartosz Taudul 2019-11-17 17:38:02 +01:00
parent c62732804a
commit 3854ae11b2
1 changed files with 254 additions and 4 deletions
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258
client/tracy_concurrentqueue.h
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@ -209,6 +209,12 @@ struct ConcurrentQueueDefaultTraits
// internal queue.
static const std::uint32_t EXPLICIT_CONSUMER_CONSUMPTION_QUOTA_BEFORE_ROTATE = 256;
// The maximum number of elements (inclusive) that can be enqueued to a sub-queue.
// Enqueue operations that would cause this limit to be surpassed will fail. Note
// that this limit is enforced at the block level (for performance reasons), i.e.
// it's rounded up to the nearest block size.
static const size_t MAX_SUBQUEUE_SIZE = details::const_numeric_max<size_t>::value;
// Memory allocation can be customized if needed.
// malloc should return nullptr on failure, and handle alignment like std::malloc.
@ -291,6 +297,63 @@ namespace details
++x;
return x;
}
template<typename T>
static inline void swap_relaxed(std::atomic<T>& left, std::atomic<T>& right)
{
T temp = std::move(left.load(std::memory_order_relaxed));
left.store(std::move(right.load(std::memory_order_relaxed)), std::memory_order_relaxed);
right.store(std::move(temp), std::memory_order_relaxed);
}
template<typename T>
static inline T const& nomove(T const& x)
{
return x;
}
template<bool Enable>
struct nomove_if
{
template<typename T>
static inline T const& eval(T const& x)
{
return x;
}
};
template<>
struct nomove_if<false>
{
template<typename U>
static inline auto eval(U&& x)
-> decltype(std::forward<U>(x))
{
return std::forward<U>(x);
}
};
template<typename It>
static inline auto deref_noexcept(It& it) MOODYCAMEL_NOEXCEPT -> decltype(*it)
{
return *it;
}
#if defined(__clang__) || !defined(__GNUC__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8)
template<typename T> struct is_trivially_destructible : std::is_trivially_destructible<T> { };
#else
template<typename T> struct is_trivially_destructible : std::has_trivial_destructor<T> { };
#endif
template<typename T> struct static_is_lock_free_num { enum { value = 0 }; };
template<> struct static_is_lock_free_num<signed char> { enum { value = ATOMIC_CHAR_LOCK_FREE }; };
template<> struct static_is_lock_free_num<short> { enum { value = ATOMIC_SHORT_LOCK_FREE }; };
template<> struct static_is_lock_free_num<int> { enum { value = ATOMIC_INT_LOCK_FREE }; };
template<> struct static_is_lock_free_num<long> { enum { value = ATOMIC_LONG_LOCK_FREE }; };
template<> struct static_is_lock_free_num<long long> { enum { value = ATOMIC_LLONG_LOCK_FREE }; };
template<typename T> struct static_is_lock_free : static_is_lock_free_num<typename std::make_signed<T>::type> { };
template<> struct static_is_lock_free<bool> { enum { value = ATOMIC_BOOL_LOCK_FREE }; };
template<typename U> struct static_is_lock_free<U*> { enum { value = ATOMIC_POINTER_LOCK_FREE }; };
}
@ -325,6 +388,16 @@ struct ProducerToken
}
}
// A token is always valid unless:
// 1) Memory allocation failed during construction
// 2) It was moved via the move constructor
// (Note: assignment does a swap, leaving both potentially valid)
// 3) The associated queue was destroyed
// Note that if valid() returns true, that only indicates
// that the token is valid for use with a specific queue,
// but not which one; that's up to the user to track.
inline bool valid() const { return producer != nullptr; }
~ProducerToken()
{
if (producer != nullptr) {
@ -350,8 +423,25 @@ struct ConsumerToken
template<typename T, typename Traits>
explicit ConsumerToken(ConcurrentQueue<T, Traits>& q);
ConsumerToken(ConsumerToken&& other) MOODYCAMEL_DELETE_FUNCTION;
ConsumerToken& operator=(ConsumerToken&& other) MOODYCAMEL_DELETE_FUNCTION;
ConsumerToken(ConsumerToken&& other) MOODYCAMEL_NOEXCEPT
: initialOffset(other.initialOffset), lastKnownGlobalOffset(other.lastKnownGlobalOffset), itemsConsumedFromCurrent(other.itemsConsumedFromCurrent), currentProducer(other.currentProducer), desiredProducer(other.desiredProducer)
{
}
inline ConsumerToken& operator=(ConsumerToken&& other) MOODYCAMEL_NOEXCEPT
{
swap(other);
return *this;
}
void swap(ConsumerToken& other) MOODYCAMEL_NOEXCEPT
{
std::swap(initialOffset, other.initialOffset);
std::swap(lastKnownGlobalOffset, other.lastKnownGlobalOffset);
std::swap(itemsConsumedFromCurrent, other.itemsConsumedFromCurrent);
std::swap(currentProducer, other.currentProducer);
std::swap(desiredProducer, other.desiredProducer);
}
// Disable copying and assignment
ConsumerToken(ConsumerToken const&) MOODYCAMEL_DELETE_FUNCTION;
@ -385,6 +475,15 @@ public:
static const size_t EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD = static_cast<size_t>(Traits::EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD);
static const size_t EXPLICIT_INITIAL_INDEX_SIZE = static_cast<size_t>(Traits::EXPLICIT_INITIAL_INDEX_SIZE);
static const std::uint32_t EXPLICIT_CONSUMER_CONSUMPTION_QUOTA_BEFORE_ROTATE = static_cast<std::uint32_t>(Traits::EXPLICIT_CONSUMER_CONSUMPTION_QUOTA_BEFORE_ROTATE);
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4307) // + integral constant overflow (that's what the ternary expression is for!)
#pragma warning(disable: 4309) // static_cast: Truncation of constant value
#endif
static const size_t MAX_SUBQUEUE_SIZE = (details::const_numeric_max<size_t>::value - static_cast<size_t>(Traits::MAX_SUBQUEUE_SIZE) < BLOCK_SIZE) ? details::const_numeric_max<size_t>::value : ((static_cast<size_t>(Traits::MAX_SUBQUEUE_SIZE) + (BLOCK_SIZE - 1)) / BLOCK_SIZE * BLOCK_SIZE);
#ifdef _MSC_VER
#pragma warning(pop)
#endif
static_assert(!std::numeric_limits<size_t>::is_signed && std::is_integral<size_t>::value, "Traits::size_t must be an unsigned integral type");
static_assert(!std::numeric_limits<index_t>::is_signed && std::is_integral<index_t>::value, "Traits::index_t must be an unsigned integral type");
@ -583,6 +682,20 @@ public:
}
return size;
}
// Returns true if the underlying atomic variables used by
// the queue are lock-free (they should be on most platforms).
// Thread-safe.
static bool is_lock_free()
{
return
details::static_is_lock_free<bool>::value == 2 &&
details::static_is_lock_free<size_t>::value == 2 &&
details::static_is_lock_free<std::uint32_t>::value == 2 &&
details::static_is_lock_free<index_t>::value == 2 &&
details::static_is_lock_free<void*>::value == 2;
}
private:
@ -657,6 +770,7 @@ private:
{
FreeList() : freeListHead(nullptr) { }
FreeList(FreeList&& other) : freeListHead(other.freeListHead.load(std::memory_order_relaxed)) { other.freeListHead.store(nullptr, std::memory_order_relaxed); }
void swap(FreeList& other) { details::swap_relaxed(freeListHead, other.freeListHead); }
FreeList(FreeList const&) MOODYCAMEL_DELETE_FUNCTION;
FreeList& operator=(FreeList const&) MOODYCAMEL_DELETE_FUNCTION;
@ -781,6 +895,23 @@ private:
}
}
// Returns true if the block is now empty (does not apply in explicit context)
inline bool set_empty(index_t i)
{
if (BLOCK_SIZE <= EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD) {
// Set flag
assert(!emptyFlags[BLOCK_SIZE - 1 - static_cast<size_t>(i & static_cast<index_t>(BLOCK_SIZE - 1))].load(std::memory_order_relaxed));
emptyFlags[BLOCK_SIZE - 1 - static_cast<size_t>(i & static_cast<index_t>(BLOCK_SIZE - 1))].store(true, std::memory_order_release);
return false;
}
else {
// Increment counter
auto prevVal = elementsCompletelyDequeued.fetch_add(1, std::memory_order_release);
assert(prevVal < BLOCK_SIZE);
return prevVal == BLOCK_SIZE - 1;
}
}
// Sets multiple contiguous item statuses to 'empty' (assumes no wrapping and count > 0).
// Returns true if the block is now empty (does not apply in explicit context).
inline bool set_many_empty(index_t i, size_t count)
@ -803,6 +934,20 @@ private:
}
}
inline void set_all_empty()
{
if (BLOCK_SIZE <= EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD) {
// Set all flags
for (size_t i = 0; i != BLOCK_SIZE; ++i) {
emptyFlags[i].store(true, std::memory_order_relaxed);
}
}
else {
// Reset counter
elementsCompletelyDequeued.store(BLOCK_SIZE, std::memory_order_relaxed);
}
}
inline void reset_empty()
{
if (compile_time_condition<BLOCK_SIZE <= EXPLICIT_BLOCK_EMPTY_COUNTER_THRESHOLD>::value) {
@ -1043,6 +1188,68 @@ private:
return this->tailIndex;
}
template<typename It>
size_t dequeue_bulk(It& itemFirst, size_t max)
{
auto tail = this->tailIndex.load(std::memory_order_relaxed);
auto overcommit = this->dequeueOvercommit.load(std::memory_order_relaxed);
auto desiredCount = static_cast<size_t>(tail - (this->dequeueOptimisticCount.load(std::memory_order_relaxed) - overcommit));
if (details::circular_less_than<size_t>(0, desiredCount)) {
desiredCount = desiredCount < max ? desiredCount : max;
std::atomic_thread_fence(std::memory_order_acquire);
auto myDequeueCount = this->dequeueOptimisticCount.fetch_add(desiredCount, std::memory_order_relaxed);
assert(overcommit <= myDequeueCount);
tail = this->tailIndex.load(std::memory_order_acquire);
auto actualCount = static_cast<size_t>(tail - (myDequeueCount - overcommit));
if (details::circular_less_than<size_t>(0, actualCount)) {
actualCount = desiredCount < actualCount ? desiredCount : actualCount;
if (actualCount < desiredCount) {
this->dequeueOvercommit.fetch_add(desiredCount - actualCount, std::memory_order_release);
}
// Get the first index. Note that since there's guaranteed to be at least actualCount elements, this
// will never exceed tail.
auto firstIndex = this->headIndex.fetch_add(actualCount, std::memory_order_acq_rel);
// Determine which block the first element is in
auto localBlockIndex = blockIndex.load(std::memory_order_acquire);
auto localBlockIndexHead = localBlockIndex->front.load(std::memory_order_acquire);
auto headBase = localBlockIndex->entries[localBlockIndexHead].base;
auto firstBlockBaseIndex = firstIndex & ~static_cast<index_t>(BLOCK_SIZE - 1);
auto offset = static_cast<size_t>(static_cast<typename std::make_signed<index_t>::type>(firstBlockBaseIndex - headBase) / BLOCK_SIZE);
auto indexIndex = (localBlockIndexHead + offset) & (localBlockIndex->size - 1);
// Iterate the blocks and dequeue
auto index = firstIndex;
do {
auto firstIndexInBlock = index;
auto endIndex = (index & ~static_cast<index_t>(BLOCK_SIZE - 1)) + static_cast<index_t>(BLOCK_SIZE);
endIndex = details::circular_less_than<index_t>(firstIndex + static_cast<index_t>(actualCount), endIndex) ? firstIndex + static_cast<index_t>(actualCount) : endIndex;
auto block = localBlockIndex->entries[indexIndex].block;
const auto sz = endIndex - index;
memcpy( itemFirst, (*block)[index], sizeof( T ) * sz );
index += sz;
itemFirst += sz;
block->ConcurrentQueue::Block::set_many_empty(firstIndexInBlock, static_cast<size_t>(endIndex - firstIndexInBlock));
indexIndex = (indexIndex + 1) & (localBlockIndex->size - 1);
} while (index != firstIndex + actualCount);
return actualCount;
}
else {
// Wasn't anything to dequeue after all; make the effective dequeue count eventually consistent
this->dequeueOvercommit.fetch_add(desiredCount, std::memory_order_release);
}
}
return 0;
}
private:
struct BlockIndexEntry
{
@ -1153,6 +1360,15 @@ private:
freeList.add(block);
}
inline void add_blocks_to_free_list(Block* block)
{
while (block != nullptr) {
auto next = block->next;
add_block_to_free_list(block);
block = next;
}
}
inline Block* try_get_block_from_free_list()
{
return freeList.try_get();
@ -1177,9 +1393,15 @@ private:
//////////////////////////////////
// Producer list manipulation
//////////////////////////////////
//////////////////////////////////
ProducerBase* recycle_or_create_producer()
ProducerBase* recycle_or_create_producer()
{
bool recycled;
return recycle_or_create_producer(recycled);
}
ProducerBase* recycle_or_create_producer(bool& recycled)
{
// Try to re-use one first
for (auto ptr = producerListTail.load(std::memory_order_acquire); ptr != nullptr; ptr = ptr->next_prod()) {
@ -1189,12 +1411,14 @@ private:
bool expected = true;
if (ptr->inactive.compare_exchange_strong(expected, /* desired */ false, std::memory_order_acquire, std::memory_order_relaxed)) {
// We caught one! It's been marked as activated, the caller can have it
recycled = true;
return ptr;
}
}
}
}
recycled = false;
return add_producer(static_cast<ProducerBase*>(create<ExplicitProducer>(this)));
}
@ -1216,6 +1440,16 @@ private:
return producer;
}
void reown_producers()
{
// After another instance is moved-into/swapped-with this one, all the
// producers we stole still think their parents are the other queue.
// So fix them up!
for (auto ptr = producerListTail.load(std::memory_order_relaxed); ptr != nullptr; ptr = ptr->next_prod()) {
ptr->parent = this;
}
}
//////////////////////////////////
// Utility functions
//////////////////////////////////
@ -1293,6 +1527,22 @@ ConsumerToken::ConsumerToken(ConcurrentQueue<T, Traits>& queue)
lastKnownGlobalOffset = static_cast<std::uint32_t>(-1);
}
template<typename T, typename Traits>
inline void swap(ConcurrentQueue<T, Traits>& a, ConcurrentQueue<T, Traits>& b) MOODYCAMEL_NOEXCEPT
{
a.swap(b);
}
inline void swap(ProducerToken& a, ProducerToken& b) MOODYCAMEL_NOEXCEPT
{
a.swap(b);
}
inline void swap(ConsumerToken& a, ConsumerToken& b) MOODYCAMEL_NOEXCEPT
{
a.swap(b);
}
}
} /* namespace tracy */