y2038: nptl: Convert pthread_mutex_{clock|timed}lock to support 64 bit

The pthread_mutex_clocklock and pthread_mutex_timedlock have been converted
to support 64 bit time.

This change uses:
- New __futex_clocklock_wait64 (instead of lll_timedwait)

from ./sysdeps/nptl/futex-helpers.c and

- New __futex_clocklock64 function (instead of lll_clocklock)
- New futex_lock_pi64

defined in sysdeps/nptl/futex-internal.h

The pthread_mutex_{clock|timed}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.

Some architectures - namely x86, powerpc and s390 - do support lock elision.
For those - adjustments have been made in arch specific elision-*.c files
to use __futex_clocklock64 instead of lll_clocklock.
The __lll_lock_elision (aliased to __lll_clocklock_elision in e.g.
sysdeps/unix/sysv/linux/s390/elision-timed.c) just uses, in this patch
provided, __futex_clocklock64.

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

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

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

2 files changed, 55 insertions, 20 deletions

diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index 5bcc8a2db5..710b21e890 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -468,6 +468,8 @@ extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
 # define __pthread_rwlock_clockwrlock64 __pthread_rwlock_clockwrlock
 # define __pthread_rwlock_timedrdlock64 __pthread_rwlock_timedrdlock
 # define __pthread_rwlock_timedwrlock64 __pthread_rwlock_timedwrlock
+# define __pthread_mutex_clocklock64 __pthread_mutex_clocklock
+# define __pthread_mutex_timedlock64 __pthread_mutex_timedlock
 #else
 extern int __pthread_clockjoin_np64 (pthread_t threadid, void **thread_return,
                                      clockid_t clockid,
@@ -499,6 +501,13 @@ libpthread_hidden_proto (__pthread_rwlock_timedrdlock64)
 extern int __pthread_rwlock_timedwrlock64 (pthread_rwlock_t *rwlock,
                                            const struct __timespec64 *abstime);
 libpthread_hidden_proto (__pthread_rwlock_timedwrlock64)
+extern int __pthread_mutex_clocklock64 (pthread_mutex_t *mutex,
+                                        clockid_t clockid,
+                                        const struct __timespec64 *abstime);
+libpthread_hidden_proto (__pthread_mutex_clocklock64)
+extern int __pthread_mutex_timedlock64 (pthread_mutex_t *mutex,
+                                        const struct __timespec64 *abstime);
+libpthread_hidden_proto (__pthread_mutex_timedlock64)
 #endif
 
 extern int __pthread_cond_timedwait (pthread_cond_t *cond,
diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c
index 8ae814b984..dc40399f02 100644
--- a/nptl/pthread_mutex_timedlock.c
+++ b/nptl/pthread_mutex_timedlock.c
@@ -31,7 +31,7 @@
 
 #ifndef lll_clocklock_elision
 #define lll_clocklock_elision(futex, adapt_count, clockid, abstime, private) \
-  lll_clocklock (futex, clockid, abstime, private)
+  __futex_clocklock64 (&(futex), clockid, abstime, private)
 #endif
 
 #ifndef lll_trylock_elision
@@ -45,7 +45,7 @@
 int
 __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 				  clockid_t clockid,
-				  const struct timespec *abstime)
+				  const struct __timespec64 *abstime)
 {
   int oldval;
   pid_t id = THREAD_GETMEM (THREAD_SELF, tid);
@@ -76,8 +76,8 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 	}
 
       /* We have to get the mutex.  */
-      result = lll_clocklock (mutex->__data.__lock, clockid, abstime,
-			      PTHREAD_MUTEX_PSHARED (mutex));
+      result = __futex_clocklock64 (&mutex->__data.__lock, clockid, abstime,
+                                    PTHREAD_MUTEX_PSHARED (mutex));
 
       if (result != 0)
 	goto out;
@@ -99,8 +99,8 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
       FORCE_ELISION (mutex, goto elision);
     simple:
       /* Normal mutex.  */
-      result = lll_clocklock (mutex->__data.__lock, clockid, abstime,
-			      PTHREAD_MUTEX_PSHARED (mutex));
+      result = __futex_clocklock64 (&mutex->__data.__lock, clockid, abstime,
+                                    PTHREAD_MUTEX_PSHARED (mutex));
       break;
 
     case PTHREAD_MUTEX_TIMED_ELISION_NP:
@@ -125,9 +125,9 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 	    {
 	      if (cnt++ >= max_cnt)
 		{
-		  result = lll_clocklock (mutex->__data.__lock,
-					  clockid, abstime,
-					  PTHREAD_MUTEX_PSHARED (mutex));
+		  result = __futex_clocklock64 (&mutex->__data.__lock,
+		                                clockid, abstime,
+		                                PTHREAD_MUTEX_PSHARED (mutex));
 		  break;
 		}
 	      atomic_spin_nop ();
@@ -378,8 +378,7 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 	    int private = (robust
 			   ? PTHREAD_ROBUST_MUTEX_PSHARED (mutex)
 			   : PTHREAD_MUTEX_PSHARED (mutex));
-	    int e = futex_lock_pi ((unsigned int *) &mutex->__data.__lock,
-				   abstime, private);
+	    int e = futex_lock_pi64 (&mutex->__data.__lock, abstime, private);
 	    if (e == ETIMEDOUT)
 	      return ETIMEDOUT;
 	    else if (e == ESRCH || e == EDEADLK)
@@ -394,8 +393,8 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 		/* Delay the thread until the timeout is reached. Then return
 		   ETIMEDOUT.  */
 		do
-		  e = lll_timedwait (&(int){0}, 0, clockid, abstime,
-				     private);
+		  e = __futex_clocklock_wait64 (&(int){0}, 0, clockid, abstime,
+		                                private);
 		while (e != ETIMEDOUT);
 		return ETIMEDOUT;
 	      }
@@ -543,10 +542,10 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 			goto failpp;
 		      }
 
-		    struct timespec rt;
+		    struct __timespec64 rt;
 
 		    /* Get the current time.  */
-		    __clock_gettime (CLOCK_REALTIME, &rt);
+		    __clock_gettime64 (CLOCK_REALTIME, &rt);
 
 		    /* Compute relative timeout.  */
 		    rt.tv_sec = abstime->tv_sec - rt.tv_sec;
@@ -599,9 +598,9 @@ __pthread_mutex_clocklock_common (pthread_mutex_t *mutex,
 }
 
 int
-__pthread_mutex_clocklock (pthread_mutex_t *mutex,
-			   clockid_t clockid,
-			   const struct timespec *abstime)
+__pthread_mutex_clocklock64 (pthread_mutex_t *mutex,
+			     clockid_t clockid,
+			     const struct __timespec64 *abstime)
 {
   if (__glibc_unlikely (!lll_futex_supported_clockid (clockid)))
     return EINVAL;
@@ -609,13 +608,40 @@ __pthread_mutex_clocklock (pthread_mutex_t *mutex,
   LIBC_PROBE (mutex_clocklock_entry, 3, mutex, clockid, abstime);
   return __pthread_mutex_clocklock_common (mutex, clockid, abstime);
 }
-weak_alias (__pthread_mutex_clocklock, pthread_mutex_clocklock)
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__pthread_mutex_clocklock64)
 
 int
-__pthread_mutex_timedlock (pthread_mutex_t *mutex,
+__pthread_mutex_clocklock (pthread_mutex_t *mutex,
+			   clockid_t clockid,
 			   const struct timespec *abstime)
 {
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __pthread_mutex_clocklock64 (mutex, clockid, &ts64);
+}
+#endif
+weak_alias (__pthread_mutex_clocklock, pthread_mutex_clocklock)
+
+int
+__pthread_mutex_timedlock64 (pthread_mutex_t *mutex,
+			     const struct __timespec64 *abstime)
+{
   LIBC_PROBE (mutex_timedlock_entry, 2, mutex, abstime);
   return __pthread_mutex_clocklock_common (mutex, CLOCK_REALTIME, abstime);
 }
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__pthread_mutex_timedlock64)
+
+int
+__pthread_mutex_timedlock (pthread_mutex_t *mutex,
+			   const struct timespec *abstime)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __pthread_mutex_timedlock64 (mutex, &ts64);
+}
+#endif
 weak_alias (__pthread_mutex_timedlock, pthread_mutex_timedlock)