intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 35 insertions, 0 deletions

diff --git a/library/cpp/coroutine/engine/stack/stack_common.h b/library/cpp/coroutine/engine/stack/stack_common.h
new file mode 100644
index 0000000000..ed2d74d296
--- /dev/null
+++ b/library/cpp/coroutine/engine/stack/stack_common.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include <cstdint>
+
+class TContExecutor;
+
+namespace NCoro::NStack {
+
+    static constexpr uint64_t PageSize = 4096;
+    static constexpr uint64_t PageSizeMask = PageSize - 1; // for checks
+    static constexpr uint64_t DebugOrSanStackMultiplier = 4; // for debug or sanitizer builds
+    static constexpr uint64_t SmallStackMaxSizeInPages = 6;
+
+    enum class EGuard {
+        Canary, //!< writes some data to check it for corruption
+        Page,   //!< prohibits access to page memory
+    };
+
+    struct TPoolAllocatorSettings {
+        uint64_t RssPagesToKeep = 1;
+        uint64_t SmallStackRssPagesToKeep = 1; // for stack less than SmallStackMaxSizeInPages
+        uint64_t ReleaseRate = 2;
+#if !defined(_san_enabled_) && defined(NDEBUG)
+        uint64_t StacksPerChunk = 256;
+#else
+        uint64_t StacksPerChunk = 2;
+#endif
+    };
+
+    struct TAllocatorStats {
+        uint64_t ReleasedSize = 0;
+        uint64_t NotReleasedSize = 0;
+        uint64_t NumOfAllocated = 0;
+    };
+}