33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
#![cfg_attr(feature = "alloc_trait", feature(allocator_api))]
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use tikv_jemallocator::Jemalloc;
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#[global_allocator]
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static A: Jemalloc = Jemalloc;
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#[test]
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#[cfg(feature = "alloc_trait")]
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fn shrink_in_place() {
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unsafe {
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use std::alloc::{Alloc, Layout};
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// allocate a "large" block of memory:
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let orig_sz = 10 * 4096;
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let orig_l = Layout::from_size_align(orig_sz, 1).unwrap();
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let ptr = Jemalloc.alloc(orig_l).unwrap();
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// try to shrink it in place to 1 byte - if this succeeds,
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// the size-class of the new allocation should be different
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// than that of the original allocation:
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let new_sz = 1;
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if let Ok(()) = Jemalloc.shrink_in_place(ptr, orig_l, new_sz) {
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// test that deallocating with the new layout succeeds:
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let new_l = Layout::from_size_align(new_sz, 1).unwrap();
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Jemalloc.dealloc(ptr, new_l);
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} else {
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// if shrink in place failed - deallocate with the old layout
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Jemalloc.dealloc(ptr, orig_l);
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}
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}
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}
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