microsoft/qdk
Publicmirrored fromhttps://github.com/microsoft/qdkAvailable
allocator/mimalloc-sys/src/lib.rs
48lines · modecode
| 1 | // Copyright (c) Microsoft Corporation. |
| 2 | // Licensed under the MIT License. |
| 3 | |
| 4 | use core::ffi::c_void; |
| 5 | pub static MI_ALIGNMENT_MAX: usize = 1024 * 1024; // 1 MiB |
| 6 | |
| 7 | extern "C" { |
| 8 | /// Allocate size bytes aligned by alignment. |
| 9 | /// size: the number of bytes to allocate |
| 10 | /// alignment: the minimal alignment of the allocated memory. Must be less than MI_ALIGNMENT_MAX |
| 11 | /// returns: a pointer to the allocated memory, or null if out of memory. The returned pointer is aligned by alignment |
| 12 | pub fn mi_malloc_aligned(size: usize, alignment: usize) -> *mut c_void; |
| 13 | pub fn mi_zalloc_aligned(size: usize, alignment: usize) -> *mut c_void; |
| 14 | |
| 15 | /// Free previously allocated memory. |
| 16 | /// The pointer p must have been allocated before (or be nullptr). |
| 17 | /// p: the pointer to the memory to free or nullptr |
| 18 | pub fn mi_free(p: *mut c_void); |
| 19 | pub fn mi_realloc_aligned(p: *mut c_void, newsize: usize, alignment: usize) -> *mut c_void; |
| 20 | } |
| 21 | |
| 22 | #[cfg(test)] |
| 23 | mod tests { |
| 24 | use super::*; |
| 25 | |
| 26 | #[test] |
| 27 | fn memory_can_be_allocated_and_freed() { |
| 28 | let ptr = unsafe { mi_malloc_aligned(8, 8) }.cast::<u8>(); |
| 29 | assert!(!ptr.cast::<c_void>().is_null()); |
| 30 | unsafe { mi_free(ptr.cast::<c_void>()) }; |
| 31 | } |
| 32 | |
| 33 | #[test] |
| 34 | fn memory_can_be_allocated_zeroed_and_freed() { |
| 35 | let ptr = unsafe { mi_zalloc_aligned(8, 8) }.cast::<u8>(); |
| 36 | assert!(!ptr.cast::<c_void>().is_null()); |
| 37 | unsafe { mi_free(ptr.cast::<c_void>()) }; |
| 38 | } |
| 39 | |
| 40 | #[test] |
| 41 | fn memory_can_be_reallocated_and_freed() { |
| 42 | let ptr = unsafe { mi_malloc_aligned(8, 8) }.cast::<u8>(); |
| 43 | assert!(!ptr.cast::<c_void>().is_null()); |
| 44 | let realloc_ptr = unsafe { mi_realloc_aligned(ptr.cast::<c_void>(), 8, 8) }.cast::<u8>(); |
| 45 | assert!(!realloc_ptr.cast::<c_void>().is_null()); |
| 46 | unsafe { mi_free(ptr.cast::<c_void>()) }; |
| 47 | } |
| 48 | } |
| 49 | |