diff options
| -rw-r--r-- | library/std/src/sys/pal/unix/locks/pthread_mutex.rs | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/library/std/src/sys/pal/unix/locks/pthread_mutex.rs b/library/std/src/sys/pal/unix/locks/pthread_mutex.rs index 8a78bc1fd73..ee0794334fb 100644 --- a/library/std/src/sys/pal/unix/locks/pthread_mutex.rs +++ b/library/std/src/sys/pal/unix/locks/pthread_mutex.rs @@ -1,4 +1,5 @@ use crate::cell::UnsafeCell; +use crate::io::Error; use crate::mem::{forget, MaybeUninit}; use crate::sys::cvt_nz; use crate::sys_common::lazy_box::{LazyBox, LazyInit}; @@ -103,8 +104,24 @@ impl Mutex { #[inline] pub unsafe fn lock(&self) { + #[cold] + #[inline(never)] + fn fail(r: i32) -> ! { + let error = Error::from_raw_os_error(r); + panic!("failed to lock mutex: {error}"); + } + let r = libc::pthread_mutex_lock(raw(self)); - debug_assert_eq!(r, 0); + // As we set the mutex type to `PTHREAD_MUTEX_NORMAL` above, we expect + // the lock call to never fail. Unfortunately however, some platforms + // (Solaris) do not conform to the standard, and instead always provide + // deadlock detection. How kind of them! Unfortunately that means that + // we need to check the error code here. To save us from UB on other + // less well-behaved platforms in the future, we do it even on "good" + // platforms like macOS. See #120147 for more context. + if r != 0 { + fail(r) + } } #[inline] |