70 lines
2.1 KiB
Rust
70 lines
2.1 KiB
Rust
//@ignore-windows: No libc on Windows
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#![feature(rustc_private)]
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extern crate libc;
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use std::mem;
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use std::ptr;
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pub type Key = libc::pthread_key_t;
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static mut RECORD: usize = 0;
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static mut KEYS: [Key; 2] = [0; 2];
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static mut GLOBALS: [u64; 2] = [1, 0];
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static mut CANNARY: *mut u64 = ptr::null_mut(); // this serves as a cannary: if TLS dtors are not run properly, this will not get deallocated, making the test fail.
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pub unsafe fn create(dtor: Option<unsafe extern "C" fn(*mut u8)>) -> Key {
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let mut key = 0;
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assert_eq!(libc::pthread_key_create(&mut key, mem::transmute(dtor)), 0);
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key
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}
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pub unsafe fn set(key: Key, value: *mut u8) {
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let r = libc::pthread_setspecific(key, value as *mut _);
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assert_eq!(r, 0);
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}
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pub fn record(r: usize) {
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assert!(r < 10);
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unsafe { RECORD = RECORD * 10 + r };
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}
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unsafe extern "C" fn dtor(ptr: *mut u64) {
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assert!(CANNARY != ptr::null_mut()); // make sure we do not get run too often
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let val = *ptr;
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let which_key =
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GLOBALS.iter().position(|global| global as *const _ == ptr).expect("Should find my global");
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record(which_key);
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if val > 0 {
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*ptr = val - 1;
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set(KEYS[which_key], ptr as *mut _);
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}
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// Check if the records matches what we expect. If yes, clear the cannary.
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// If the record is wrong, the cannary will never get cleared, leading to a leak -> test fails.
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// If the record is incomplete (i.e., more dtor calls happen), the check at the beginning of this function will fail -> test fails.
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// The correct sequence is: First key 0, then key 1, then key 0.
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if RECORD == 0_1_0 {
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drop(Box::from_raw(CANNARY));
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CANNARY = ptr::null_mut();
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}
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}
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fn main() {
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unsafe {
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create(None); // check that the no-dtor case works
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// Initialize the keys we use to check destructor ordering
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for (key, global) in KEYS.iter_mut().zip(GLOBALS.iter_mut()) {
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*key = create(Some(mem::transmute(dtor as unsafe extern "C" fn(*mut u64))));
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set(*key, global as *mut _ as *mut u8);
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}
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// Initialize cannary
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CANNARY = Box::into_raw(Box::new(0u64));
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}
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}
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