std: always check the result of pthread_mutex_lock

Author: joboet

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 +104,17 @@ impl Mutex {
 
     #[inline]
     pub unsafe fn lock(&self) {
+        #[cold]
+        #[inline(never)]
+        fn fail() -> ! {
+            let error = Error::last_os_error();
+            panic!("failed to lock mutex: {error}");
+        }
+
         let r = libc::pthread_mutex_lock(raw(self));
-        debug_assert_eq!(r, 0);
+        if r != 0 {
+            fail()
+        }
     }
 
     #[inline]