[glibc] htl: Fix sem_wait race between read and gsync_wait

[glibc] htl: Fix sem_wait race between read and gsync_wait

[Samuel Thibault]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=289b098c9e21e2805e3835f9b5780235ab14a290

commit 289b098c9e21e2805e3835f9b5780235ab14a290
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Fri Dec 30 00:40:18 2022 +0100

    htl: Fix sem_wait race between read and gsync_wait
    
    If the value changes between sem_wait's read and the gsync_wait call,
    the kernel will return KERN_INVALID_ARGUMENT, which we have to interpret
    as the value having already changed.
    
    This fixes applications (e.g. libgo) seeing sem_wait erroneously return
    KERN_INVALID_ARGUMENT.

Diff:
---
 sysdeps/htl/sem-timedwait.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sysdeps/htl/sem-timedwait.c b/sysdeps/htl/sem-timedwait.c
index 1b1eec9f59..c610804b08 100644
--- a/sysdeps/htl/sem-timedwait.c
+++ b/sysdeps/htl/sem-timedwait.c
@@ -79,7 +79,7 @@ __sem_timedwait_internal (sem_t *restrict sem,
 		      ((unsigned int *) &sem->data) + SEM_VALUE_OFFSET,
 		      0, flags);
 
-	  if (err != 0)
+	  if (err != 0 && err != KERN_INVALID_ARGUMENT)
 	    {
 	      /* Error, interruption or timeout, abort.  */
 	      if (err == KERN_TIMEDOUT)
@@ -138,7 +138,7 @@ __sem_timedwait_internal (sem_t *restrict sem,
 		err = __lll_wait_intr (&isem->value,
 			  SEM_NWAITERS_MASK, flags);
 
-	      if (err != 0)
+	      if (err != 0 && err != KERN_INVALID_ARGUMENT)
 		{
 		  /* Error, interruption or timeout, abort.  */
 		  if (err == KERN_TIMEDOUT)