mirror of https://github.com/rust-lang/rust
58 lines
1.7 KiB
Rust
58 lines
1.7 KiB
Rust
// Verifies that ThreadSanitizer is able to detect a data race in heap allocated
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// memory block.
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//
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// Test case minimizes the use of the standard library to avoid its ambiguous
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// status with respect to instrumentation (it could vary depending on whatever
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// a function call is inlined or not).
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//
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// The conflicting data access is de-facto synchronized with a special TSAN
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// barrier, which does not introduce synchronization from TSAN perspective, but
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// is necessary to make the test robust. Without the barrier data race detection
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// would occasionally fail, making test flaky.
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//
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//@ needs-sanitizer-support
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//@ needs-sanitizer-thread
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//
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//@ compile-flags: -Z sanitizer=thread -O
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//
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//@ run-fail
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//@ error-pattern: WARNING: ThreadSanitizer: data race
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//@ error-pattern: Location is heap block of size 4
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//@ error-pattern: allocated by main thread
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#![feature(raw_ref_op)]
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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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static mut BARRIER: u64 = 0;
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extern "C" {
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fn __tsan_testonly_barrier_init(barrier: *mut u64, count: u32);
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fn __tsan_testonly_barrier_wait(barrier: *mut u64);
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}
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extern "C" fn start(c: *mut libc::c_void) -> *mut libc::c_void {
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unsafe {
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let c: *mut u32 = c.cast();
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*c += 1;
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__tsan_testonly_barrier_wait(&raw mut BARRIER);
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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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__tsan_testonly_barrier_init(&raw mut BARRIER, 2);
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let c: *mut u32 = Box::into_raw(Box::new(1));
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let mut t: libc::pthread_t = mem::zeroed();
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libc::pthread_create(&mut t, ptr::null(), start, c.cast());
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__tsan_testonly_barrier_wait(&raw mut BARRIER);
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*c += 1;
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libc::pthread_join(t, ptr::null_mut());
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Box::from_raw(c);
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}
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}
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