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use libc;
use std::mem;
use super::error::ArrowError;
const ALIGNMENT: usize = 64;
#[cfg(windows)]
#[link(name = "msvcrt")]
extern "C" {
fn _aligned_malloc(size: libc::size_t, alignment: libc::size_t) -> libc::size_t;
fn _aligned_free(prt: *const u8);
}
#[cfg(windows)]
pub fn allocate_aligned(size: i64) -> Result<*const u8, ArrowError> {
let page = unsafe { _aligned_malloc(size as libc::size_t, ALIGNMENT as libc::size_t) };
match page {
0 => Err(ArrowError::MemoryError(
"Failed to allocate memory".to_string(),
)),
_ => Ok(unsafe { mem::transmute::<libc::size_t, *const u8>(page) }),
}
}
#[cfg(not(windows))]
pub fn allocate_aligned(size: i64) -> Result<*const u8, ArrowError> {
unsafe {
let mut page: *mut libc::c_void = mem::uninitialized();
let result = libc::posix_memalign(&mut page, ALIGNMENT, size as usize);
match result {
0 => Ok(mem::transmute::<*mut libc::c_void, *const u8>(page)),
_ => Err(ArrowError::MemoryError(
"Failed to allocate memory".to_string(),
)),
}
}
}
#[cfg(windows)]
pub fn free_aligned(p: *const u8) {
unsafe {
_aligned_free(p);
}
}
#[cfg(not(windows))]
pub fn free_aligned(p: *const u8) {
unsafe {
libc::free(mem::transmute::<*const u8, *mut libc::c_void>(p));
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_allocate() {
for _ in 0..10 {
let p = allocate_aligned(1024).unwrap();
assert_eq!(0, (p as usize) % 64);
}
}
}