intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 27 insertions, 0 deletions

diff --git a/library/cpp/coroutine/engine/stack/stack_utils.h b/library/cpp/coroutine/engine/stack/stack_utils.h
new file mode 100644
index 0000000000..46c65240b5
--- /dev/null
+++ b/library/cpp/coroutine/engine/stack/stack_utils.h
@@ -0,0 +1,27 @@
+#pragma once
+
+#include "stack_common.h"
+
+
+namespace NCoro::NStack {
+    /*! Actual size of allocated memory can exceed size in pages, due to unaligned allocation.
+     * @param sizeInPages : number of pages to allocate
+     * @param rawPtr : pointer to unaligned memory. Should be passed to free() when is not used any more.
+     * @param alignedPtr : pointer to beginning of first fully allocated page
+     * @return : true on success
+     */
+    bool GetAlignedMemory(uint64_t sizeInPages, char*& rawPtr, char*& alignedPtr) noexcept;
+
+    /*! Release mapped RSS memory.
+     *  @param alignedPt : page-size aligned memory on which RSS memory should be freed
+     *  @param numOfPages : number of pages to free from RSS memory
+     */
+    void ReleaseRss(char* alignedPtr, uint64_t numOfPages) noexcept;
+
+    /*! Count pages with RSS memory
+     * @param alignedPtr : pointer to page-aligned memory for which calculations would be done
+     * @param numOfPages : number of pages to check
+     * @return : number of pages with RSS memory
+     */
+    uint64_t CountMapped(char* alignedPtr, uint64_t numOfPages) noexcept;
+}