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/**
* \file wasmtime/sharedmemory.h
*
* Wasmtime API for interacting with wasm shared memories.
*/
#ifndef WASMTIME_SHAREDMEMORY_H
#define WASMTIME_SHAREDMEMORY_H
#include <wasm.h>
#include <wasmtime/conf.h>
#include <wasmtime/error.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Interface for shared memories.
*
* For more information see the Rust documentation at:
* https://docs.wasmtime.dev/api/wasmtime/struct.SharedMemory.html
*/
typedef struct wasmtime_sharedmemory wasmtime_sharedmemory_t;
#ifdef WASMTIME_FEATURE_THREADS
/**
* \brief Creates a new WebAssembly shared linear memory
*
* \param engine engine that created shared memory is associated with
* \param ty the type of the memory to create
* \param ret where to store the returned memory
*
* If an error happens when creating the memory it's returned and owned by the
* caller. If an error happens then `ret` is not filled in.
*/
WASM_API_EXTERN wasmtime_error_t *
wasmtime_sharedmemory_new(const wasm_engine_t *engine,
const wasm_memorytype_t *ty,
wasmtime_sharedmemory_t **ret);
#endif // WASMTIME_FEATURE_THREADS
/**
* \brief Deletes shared linear memory
*
* \param memory memory to be deleted
*/
WASM_API_EXTERN void
wasmtime_sharedmemory_delete(wasmtime_sharedmemory_t *memory);
/**
* \brief Clones shared linear memory
*
* \param memory memory to be cloned
*
* This function makes shallow clone, ie. copy of reference counted
* memory handle.
*/
WASM_API_EXTERN wasmtime_sharedmemory_t *
wasmtime_sharedmemory_clone(const wasmtime_sharedmemory_t *memory);
/**
* \brief Returns the type of the shared memory specified
*/
WASM_API_EXTERN wasm_memorytype_t *
wasmtime_sharedmemory_type(const wasmtime_sharedmemory_t *memory);
/**
* \brief Returns the base pointer in memory where
the shared linear memory starts.
*/
WASM_API_EXTERN uint8_t *
wasmtime_sharedmemory_data(const wasmtime_sharedmemory_t *memory);
/**
* \brief Returns the byte length of this shared linear memory.
*/
WASM_API_EXTERN size_t
wasmtime_sharedmemory_data_size(const wasmtime_sharedmemory_t *memory);
/**
* \brief Returns the length, in WebAssembly pages, of this shared linear memory
*/
WASM_API_EXTERN uint64_t
wasmtime_sharedmemory_size(const wasmtime_sharedmemory_t *memory);
/**
* \brief Attempts to grow the specified shared memory by `delta` pages.
*
* \param memory the memory to grow
* \param delta the number of pages to grow by
* \param prev_size where to store the previous size of memory
*
* If memory cannot be grown then `prev_size` is left unchanged and an error is
* returned. Otherwise `prev_size` is set to the previous size of the memory, in
* WebAssembly pages, and `NULL` is returned.
*/
WASM_API_EXTERN wasmtime_error_t *
wasmtime_sharedmemory_grow(const wasmtime_sharedmemory_t *memory,
uint64_t delta, uint64_t *prev_size);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // WASMTIME_SHAREDMEMORY_H
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