+2019-03-16 Samuel Thibault <samuel.thibault@ens-lyon.org>
+
+ * hurd/hurd/signal.h (_hurd_critical_section_lock): Document how EINTR
+ should be handled.
+
2019-03-15 Joseph Myers <joseph@codesourcery.com>
* sysdeps/unix/sysv/linux/syscall-names.list: Update kernel
A critical section is a section of code which cannot safely be interrupted
to run a signal handler; for example, code that holds any lock cannot be
interrupted lest the signal handler try to take the same lock and
- deadlock result. */
+ deadlock result.
+
+ As a consequence, a critical section will see its RPCs return EINTR, even if
+ SA_RESTART is set! In that case, the critical section should be left, so
+ that the handler can run, and the whole critical section be tried again, to
+ avoid unexpectingly exposing EINTR to the application.
+ */
extern void *_hurd_critical_section_lock (void);