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Fix "illegal hardware instruction" in ch6-particles on MacOS #106

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Fix "illegal hardware instruction" in ch6-particles on MacOS #106

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a0731bc
Wrap eprintln in run_guarded function
Jan 30, 2023
ee85007
Add reference to source for run_guarded function
Jan 30, 2023
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23 changes: 22 additions & 1 deletion ch6/ch6-particles/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,12 +7,33 @@ use rand::prelude::*; // <3>
use std::alloc::{GlobalAlloc, System, Layout}; // <4>

use std::time::Instant; // <5>
//
use std::cell::Cell;


#[global_allocator] // <6>
static ALLOCATOR: ReportingAllocator = ReportingAllocator;

struct ReportingAllocator; // <7>
//
//
/// Execute a closure without logging on allocations.
/// Source: https://github.com/andrewhickman/logging-allocator/blob/master/src/lib.rs#L42-L57
pub fn run_guarded<F>(f: F)
where
F: FnOnce(),
{
thread_local! {
static GUARD: Cell<bool> = Cell::new(false);
}

GUARD.with(|guard| {
if !guard.replace(true) {
f();
guard.set(false)
}
})
}

unsafe impl GlobalAlloc for ReportingAllocator {
unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
Expand All @@ -22,7 +43,7 @@ unsafe impl GlobalAlloc for ReportingAllocator {
let time_taken = end - start;
let bytes_requested = layout.size();

eprintln!("{}\t{}", bytes_requested, time_taken.as_nanos());
run_guarded(|| {eprintln!("{}\t{}", bytes_requested, time_taken.as_nanos())});
ptr
}

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