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Add some description for (malloc/calloc/free/realloc)

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This commit is contained in:
chansuke 2020-10-21 08:15:28 +09:00
parent d413bb6f57
commit eed45107da
1 changed files with 4 additions and 0 deletions
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4
library/std/src/sys/wasm/alloc.rs
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@ -24,24 +24,28 @@ static mut DLMALLOC: dlmalloc::Dlmalloc = dlmalloc::DLMALLOC_INIT;
unsafe impl GlobalAlloc for System {
#[inline]
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
// SAFETY: DLMALLOC.malloc() is guranteed to be safe since lock::lock() aqcuire a globl lock
let _lock = lock::lock();
unsafe { DLMALLOC.malloc(layout.size(), layout.align()) }
}
#[inline]
unsafe fn alloc_zeroed(&self, layout: Layout) -> *mut u8 {
// SAFETY: DLMALLOC.calloc() is guranteed to be safe since lock::lock() aqcuire a globl lock
let _lock = lock::lock();
unsafe { DLMALLOC.calloc(layout.size(), layout.align()) }
}
#[inline]
unsafe fn dealloc(&self, ptr: *mut u8, layout: Layout) {
// SAFETY: DLMALLOC.free() is guranteed to be safe since lock::lock() aqcuire a globl lock
let _lock = lock::lock();
unsafe { DLMALLOC.free(ptr, layout.size(), layout.align()) }
}
#[inline]
unsafe fn realloc(&self, ptr: *mut u8, layout: Layout, new_size: usize) -> *mut u8 {
// SAFETY: DLMALLOC.realloc() is guranteed to be safe since lock::lock() aqcuire a globl lock
let _lock = lock::lock();
unsafe { DLMALLOC.realloc(ptr, layout.size(), layout.align(), new_size) }
}