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/*
* Copyright 2020 Axel Davy <davyaxel0@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* on the rights to use, copy, modify, merge, publish, distribute, sub
* license, and/or sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE. */
#ifndef _NINE_MEMORY_HELPER_H_
#define _NINE_MEMORY_HELPER_H_
struct NineDevice9;
struct nine_allocator;
struct nine_allocation;
/* Note: None of these functions are thread safe, thus the worker thread is disallowed
* to call any of them. Only exception is nine_free_worker reserved for it. */
struct nine_allocation *
nine_allocate(struct nine_allocator *allocator, unsigned size);
/* Note: Suballocations MUST be freed before their parent */
void nine_free(struct nine_allocator *allocator, struct nine_allocation *allocation);
void nine_free_worker(struct nine_allocator *allocator, struct nine_allocation *allocation);
void *nine_get_pointer(struct nine_allocator *allocator, struct nine_allocation *allocation);
/* We don't need the pointer anymore, but we are likely to need it again soon */
void nine_pointer_weakrelease(struct nine_allocator *allocator, struct nine_allocation *allocation);
/* We don't need the pointer anymore, probably for a long time */
void nine_pointer_strongrelease(struct nine_allocator *allocator, struct nine_allocation *allocation);
/* You can strong release when counter becomes 0.
* Once a counter is used for a given allocation, the same must keep being used */
void nine_pointer_delayedstrongrelease(struct nine_allocator *allocator,
struct nine_allocation *allocation,
unsigned *counter);
/* Note: It is disallowed to release a suballocation before its parent.
* It is disallowed to suballocate on a suballocation. */
struct nine_allocation *
nine_suballocate(struct nine_allocator* allocator, struct nine_allocation *allocation, int offset);
/* Won't be freed - but at least we can use the same interface */
struct nine_allocation *
nine_wrap_external_pointer(struct nine_allocator* allocator, void* data);
/* memfd_virtualsizelimit: Limit for the virtual memory usage (in MB)
* above which memfd files are unmapped (to reduce virtual memory usage).
* If negative, disables memfd usage. */
struct nine_allocator *
nine_allocator_create(struct NineDevice9 *device, int memfd_virtualsizelimit);
void
nine_allocator_destroy(struct nine_allocator *allocator);
#endif /* _NINE_MEMORY_HELPER_H_ */
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