57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
use crate::Dlmalloc;
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use core::alloc::{GlobalAlloc, Layout};
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use core::ptr;
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pub use crate::sys::enable_alloc_after_fork;
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/// An instance of a "global allocator" backed by `Dlmalloc`
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///
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/// This API requires the `global` feature is activated, and this type
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/// implements the `GlobalAlloc` trait in the standard library.
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pub struct GlobalDlmalloc;
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static mut DLMALLOC: Dlmalloc = Dlmalloc::new();
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unsafe impl GlobalAlloc for GlobalDlmalloc {
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#[inline]
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unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
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let _guard = lock();
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let dlmalloc = ptr::addr_of_mut!(DLMALLOC);
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(*dlmalloc).malloc(layout.size(), layout.align())
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}
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#[inline]
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unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
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let _guard = lock();
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let dlmalloc = ptr::addr_of_mut!(DLMALLOC);
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(*dlmalloc).free(ptr, layout.size(), layout.align())
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}
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#[inline]
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unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
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let _guard = lock();
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let dlmalloc = ptr::addr_of_mut!(DLMALLOC);
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(*dlmalloc).calloc(layout.size(), layout.align())
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}
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#[inline]
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unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
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let _guard = lock();
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let dlmalloc = ptr::addr_of_mut!(DLMALLOC);
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(*dlmalloc).realloc(ptr, layout.size(), layout.align(), new_size)
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}
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}
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unsafe fn lock() -> impl Drop {
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crate::sys::acquire_global_lock();
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struct Guard;
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impl Drop for Guard {
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fn drop(&mut self) {
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crate::sys::release_global_lock()
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}
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}
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Guard
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}
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