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#include "stack_storage.h"
#include "stack_utils.h"
namespace NCoro::NStack {
template<typename TGuard>
TPool<TGuard>::TPool(size_t stackSize, const TPoolAllocatorSettings& settings, const TGuard& guard)
: StackSize_(stackSize)
, RssPagesToKeep_(IsSmallStack() ? settings.SmallStackRssPagesToKeep : settings.RssPagesToKeep)
, Guard_(guard)
, ChunkSize_(Guard_.GetPageAlignedSize() + StackSize_ * settings.StacksPerChunk)
{
Y_ASSERT(RssPagesToKeep_);
if (!RssPagesToKeep_) {
RssPagesToKeep_ = 1; // at least guard should be kept
}
const size_t stackSizeInPages = stackSize / PageSize;
Y_ASSERT(stackSizeInPages >= RssPagesToKeep_);
if (stackSizeInPages < RssPagesToKeep_) {
RssPagesToKeep_ = stackSizeInPages; // keep all stack pages
}
Y_ASSERT(StackSize_ && !(StackSize_ & PageSizeMask)); // stack size is not zero and page aligned
Y_ASSERT(Guard_.GetSize() < StackSize_); // stack has enough space to place guard
Y_ASSERT(stackSizeInPages >= RssPagesToKeep_);
Storage_ = MakeHolder<TStorage>(StackSize_, RssPagesToKeep_, settings.ReleaseRate);
AllocNewMemoryChunk();
}
template<typename TGuard>
TPool<TGuard>::TPool(TPool&& other) noexcept = default;
template<typename TGuard>
TPool<TGuard>::~TPool() {
if (!Memory_.empty()) {
Y_ASSERT(NextToAlloc_ && StackSize_);
for (const auto& chunk : Memory_) {
Y_ASSERT(chunk.Raw && chunk.Aligned);
if (Guard_.ShouldRemoveProtectionBeforeFree()) {
Guard_.RemoveProtection(chunk.Aligned, Guard_.GetPageAlignedSize()); // first page in chunk
const char* endOfStacksMemory = chunk.Aligned + ChunkSize_;
for (char* i = chunk.Aligned + Guard_.GetPageAlignedSize(); i < endOfStacksMemory; i += StackSize_) {
Guard_.RemoveProtection(i, StackSize_);
}
}
free(chunk.Raw);
}
}
}
template<typename TGuard>
NDetails::TStack TPool<TGuard>::AllocStack(const char* name) {
Y_ASSERT(!Memory_.empty());
if (!Storage_->IsEmpty()) {
return Storage_->GetStack(Guard_, name);
} else {
++NumOfAllocated_;
return AllocNewStack(name);
}
}
template<typename TGuard>
void TPool<TGuard>::FreeStack(NDetails::TStack& stack) {
Y_ASSERT(Storage_->Size() < ((ChunkSize_ - Guard_.GetPageAlignedSize()) / StackSize_) * Memory_.size());
Y_ASSERT(IsStackFromThisPool(stack));
Storage_->ReturnStack(stack);
}
template<typename TGuard>
size_t TPool<TGuard>::GetReleasedSize() const noexcept {
return Storage_->GetReleasedSize();
}
template<typename TGuard>
size_t TPool<TGuard>::GetFullSize() const noexcept {
return Storage_->GetFullSize();
}
template<typename TGuard>
void TPool<TGuard>::AllocNewMemoryChunk() {
const size_t totalSizeInPages = ChunkSize_ / PageSize;
TMemory memory;
const auto res = GetAlignedMemory(totalSizeInPages, memory.Raw, memory.Aligned);
Y_VERIFY(res, "Failed to allocate memory for coro stack pool");
NextToAlloc_ = memory.Aligned + Guard_.GetPageAlignedSize(); // skip first guard page
Guard_.Protect(memory.Aligned, Guard_.GetPageAlignedSize(), false); // protect first guard page
Memory_.push_back(std::move(memory));
}
template<typename TGuard>
bool TPool<TGuard>::IsSmallStack() const noexcept {
return StackSize_ / PageSize <= SmallStackMaxSizeInPages;
}
template<typename TGuard>
bool TPool<TGuard>::IsStackFromThisPool(const NDetails::TStack& stack) const noexcept {
for (const auto& chunk : Memory_) {
const char* endOfStacksMemory = chunk.Aligned + ChunkSize_;
if (chunk.Raw <= stack.GetRawMemory() && stack.GetRawMemory() < endOfStacksMemory) {
return true;
}
}
return false;
}
template<typename TGuard>
NDetails::TStack TPool<TGuard>::AllocNewStack(const char* name) {
if (NextToAlloc_ + StackSize_ > Memory_.rbegin()->Aligned + ChunkSize_) {
AllocNewMemoryChunk(); // also sets NextToAlloc_ to first stack position in new allocated chunk of memory
}
Y_ASSERT(NextToAlloc_ + StackSize_ <= Memory_.rbegin()->Aligned + ChunkSize_);
char* newStack = NextToAlloc_;
NextToAlloc_ += StackSize_;
Guard_.Protect(newStack, StackSize_, true);
return NDetails::TStack{newStack, newStack, StackSize_, name};
}
}
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