[glibc] hurd: Make __pthread_timedblock update relative timeout on signal

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a367c5da61220542b7bdd9c4365c8e6d56d0ab2f

commit a367c5da61220542b7bdd9c4365c8e6d56d0ab2f
Author: Samuel Thibault <[email protected]>
Date:   Sun Aug 23 17:22:12 2026 +0200

    hurd: Make __pthread_timedblock update relative timeout on signal
    
    We should not let __mach_msg handle it, otherwise if we keep receiving
    signals faster than the computed relative timeout, we will never time out.

Diff:
---
 sysdeps/mach/htl/pt-timedblock.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/sysdeps/mach/htl/pt-timedblock.c b/sysdeps/mach/htl/pt-timedblock.c
index 06244bde6c..2b51f532bd 100644
--- a/sysdeps/mach/htl/pt-timedblock.c
+++ b/sysdeps/mach/htl/pt-timedblock.c
@@ -40,6 +40,7 @@ __pthread_timedblock (struct __pthread *thread,
   mach_msg_timeout_t timeout;
   struct timespec now;
 
+retry:
   /* We have an absolute time and now we have to convert it to a
      relative time.  Arg.  */
 
@@ -58,13 +59,19 @@ __pthread_timedblock (struct __pthread *thread,
     /* Need to do a carry.  */
     timeout -= (now.tv_nsec - abstime->tv_nsec + 999999) / 1000000;
 
-  err = __mach_msg (&msg, MACH_RCV_MSG | MACH_RCV_TIMEOUT | MSG_OPTIONS, 0,
+  err = __mach_msg (&msg, MACH_RCV_MSG | MACH_RCV_TIMEOUT | MSG_OPTIONS | MACH_RCV_INTERRUPT, 0,
 		    sizeof msg, thread->wakeupmsg.msgh_remote_port,
 		    timeout, MACH_PORT_NULL);
   if (err == EMACH_RCV_TIMED_OUT)
     return ETIMEDOUT;
-  if ((MSG_OPTIONS & MACH_RCV_INTERRUPT) != 0 && err == MACH_RCV_INTERRUPTED)
-    return EINTR;
+  if (err == MACH_RCV_INTERRUPTED)
+    {
+      if ((MSG_OPTIONS & MACH_RCV_INTERRUPT) != 0)
+	return EINTR;
+      else
+	/* Re-convert absolute time to relative time.  */
+	goto retry;
+    }
 
   assert_perror (err);
   return 0;