y2038: nptl: Convert pthread_rwlock_{clock|timed}{rd|wr}lock to support 64 bit time

The pthread_rwlock_clockrdlock, pthread_rwlock_clockwrlock,
pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock have been converted
to support 64 bit time.

This change uses new futex_abstimed_wait64 function in
./sysdeps/nptl/futex-helpers.c, which uses futex_time64 where possible.

The pthread_rwlock_{clock|timed}{rd|wr}lock only accepts absolute time.
Moreover, there is no need to check for NULL passed as *abstime pointer to the
syscalls as those calls have exported symbols marked with __nonull attribute
for abstime.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversions between 64 bit time to 32 bit are necessary
- Redirection to pthread_rwlock_{clock|timed}{rd|wr}lock will provide support
  for 64 bit time

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test the proper usage of both __pthread_rwlock_{clock|timed}{rd|wr}lock64
and __pthread_rwlock_{clock|timed}{rd|wr}lock.

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 16 insertions, 17 deletions

diff --git a/nptl/pthread_rwlock_common.c b/nptl/pthread_rwlock_common.c
index 3fbc66ded2..4c9f582d3d 100644
--- a/nptl/pthread_rwlock_common.c
+++ b/nptl/pthread_rwlock_common.c
@@ -278,9 +278,8 @@ __pthread_rwlock_rdunlock (pthread_rwlock_t *rwlock)
 
 
 static __always_inline int
-__pthread_rwlock_rdlock_full (pthread_rwlock_t *rwlock,
-    clockid_t clockid,
-    const struct timespec *abstime)
+__pthread_rwlock_rdlock_full64 (pthread_rwlock_t *rwlock, clockid_t clockid,
+                                const struct __timespec64 *abstime)
 {
   unsigned int r;
 
@@ -330,8 +329,9 @@ __pthread_rwlock_rdlock_full (pthread_rwlock_t *rwlock,
 		      & PTHREAD_RWLOCK_RWAITING) != 0)
 		{
 		  int private = __pthread_rwlock_get_private (rwlock);
-		  int err = futex_abstimed_wait (&rwlock->__data.__readers,
-						 r, clockid, abstime, private);
+		  int err = __futex_abstimed_wait64 (&rwlock->__data.__readers,
+		                                     r, clockid, abstime,
+		                                     private);
 		  /* We ignore EAGAIN and EINTR.  On time-outs, we can just
 		     return because we don't need to clean up anything.  */
 		  if (err == ETIMEDOUT)
@@ -457,9 +457,9 @@ __pthread_rwlock_rdlock_full (pthread_rwlock_t *rwlock,
 		  (&rwlock->__data.__wrphase_futex,
 		   &wpf, wpf | PTHREAD_RWLOCK_FUTEX_USED)))
 	    continue;
-	  int err = futex_abstimed_wait (&rwlock->__data.__wrphase_futex,
-					 1 | PTHREAD_RWLOCK_FUTEX_USED,
-					 clockid, abstime, private);
+	  int err = __futex_abstimed_wait64 (&rwlock->__data.__wrphase_futex,
+					     1 | PTHREAD_RWLOCK_FUTEX_USED,
+					     clockid, abstime, private);
 	  if (err == ETIMEDOUT)
 	    {
 	      /* If we timed out, we need to unregister.  If no read phase
@@ -585,9 +585,8 @@ __pthread_rwlock_wrunlock (pthread_rwlock_t *rwlock)
 
 
 static __always_inline int
-__pthread_rwlock_wrlock_full (pthread_rwlock_t *rwlock,
-    clockid_t clockid,
-    const struct timespec *abstime)
+__pthread_rwlock_wrlock_full64 (pthread_rwlock_t *rwlock, clockid_t clockid,
+                                const struct __timespec64 *abstime)
 {
   /* Make sure any passed in clockid and timeout value are valid.  Note that
      the previous implementation assumed that this check *must* not be
@@ -728,9 +727,9 @@ __pthread_rwlock_wrlock_full (pthread_rwlock_t *rwlock,
 	     share the flag, and another writer will wake one of the writers
 	     in this group.  */
 	  may_share_futex_used_flag = true;
-	  int err = futex_abstimed_wait (&rwlock->__data.__writers_futex,
-					 1 | PTHREAD_RWLOCK_FUTEX_USED,
-					 clockid, abstime, private);
+	  int err = __futex_abstimed_wait64 (&rwlock->__data.__writers_futex,
+					     1 | PTHREAD_RWLOCK_FUTEX_USED,
+					     clockid, abstime, private);
 	  if (err == ETIMEDOUT)
 	    {
 	      if (prefer_writer)
@@ -827,9 +826,9 @@ __pthread_rwlock_wrlock_full (pthread_rwlock_t *rwlock,
 		  (&rwlock->__data.__wrphase_futex, &wpf,
 		   PTHREAD_RWLOCK_FUTEX_USED)))
 	    continue;
-	  int err = futex_abstimed_wait (&rwlock->__data.__wrphase_futex,
-					 PTHREAD_RWLOCK_FUTEX_USED,
-					 clockid, abstime, private);
+	  int err = __futex_abstimed_wait64 (&rwlock->__data.__wrphase_futex,
+					     PTHREAD_RWLOCK_FUTEX_USED,
+					     clockid, abstime, private);
 	  if (err == ETIMEDOUT)
 	    {
 	      if (rwlock->__data.__flags != PTHREAD_RWLOCK_PREFER_READER_NP)