nptl: Rename lll_timedlock to lll_clocklock and add clockid parameter

Rename lll_timedlock to lll_clocklock and add clockid
parameter to indicate the clock that the abstime parameter should
be measured against in preparation for adding
pthread_mutex_clocklock.

The name change mirrors the naming for the exposed pthread functions:

 timed => absolute timeout measured against CLOCK_REALTIME (or clock
          specified by attribute in the case of pthread_cond_timedwait.)

 clock => absolute timeout measured against clock specified in preceding
          parameter.

	* sysdeps/nptl/lowlevellock.h (lll_clocklock): Rename from
	lll_timedlock and add clockid parameter. (__lll_clocklock): Rename
	from __lll_timedlock and add clockid parameter.
	* sysdeps/unix/sysv/linux/sparc/lowlevellock.h (lll_clocklock):
	Likewise.
	* nptl/lll_timedlock_wait.c (__lll_clocklock_wait): Rename from
	__lll_timedlock_wait and add clockid parameter. Use __clock_gettime
	rather than __gettimeofday so that clockid can be used. This means
	that conversion from struct timeval is no longer required.
	* sysdeps/sparc/sparc32/lowlevellock.c (lll_clocklock_wait):
	Likewise.
	* sysdeps/sparc/sparc32/lll_timedlock_wait.c: Update comment to
	refer to __lll_clocklock_wait rather than __lll_timedlock_wait.
	* nptl/pthread_mutex_timedlock.c (lll_clocklock_elision): Rename
	from lll_timedlock_elision, add clockid parameter and use
	meaningful names for other parameters. (__pthread_mutex_timedlock):
	Pass CLOCK_REALTIME where necessary to lll_clocklock and
	lll_clocklock_elision.
	* sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
	(lll_clocklock_elision): Rename from lll_timedlock_elision and add
	clockid parameter. (__lll_clocklock_elision): Rename from
	__lll_timedlock_elision and add clockid parameter.
	* sysdeps/unix/sysv/linux/s390/lowlevellock.h: Likewise.
	* sysdeps/unix/sysv/linux/x86/lowlevellock.h: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/elision-timed.c
	(__lll_lock_elision): Call __lll_clocklock_elision rather than
	__lll_timedlock_elision. (EXTRAARG): Add clockid parameter.
	(LLL_LOCK): Likewise.
	* sysdeps/unix/sysv/linux/s390/elision-timed.c: Likewise.
	* sysdeps/unix/sysv/linux/x86/elision-timed.c: Likewise.

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

2 files changed, 18 insertions, 13 deletions

diff --git a/nptl/lll_timedlock_wait.c b/nptl/lll_timedlock_wait.c
index 1f489ed..cd10593 100644
--- a/nptl/lll_timedlock_wait.c
+++ b/nptl/lll_timedlock_wait.c
@@ -24,7 +24,8 @@
 
 
 int
-__lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
+__lll_clocklock_wait (int *futex, clockid_t clockid,
+		      const struct timespec *abstime, int private)
 {
   /* Reject invalid timeouts.  */
   if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
@@ -33,15 +34,17 @@ __lll_timedlock_wait (int *futex, const struct timespec *abstime, int private)
   /* Try locking.  */
   while (atomic_exchange_acq (futex, 2) != 0)
     {
-      struct timeval tv;
+      struct timespec ts;
 
-      /* Get the current time.  */
-      (void) __gettimeofday (&tv, NULL);
+      /* Get the current time. This can only fail if clockid is not
+         valid.  */
+      if (__glibc_unlikely (__clock_gettime (clockid, &ts) != 0))
+        return EINVAL;
 
       /* Compute relative timeout.  */
       struct timespec rt;
-      rt.tv_sec = abstime->tv_sec - tv.tv_sec;
-      rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000;
+      rt.tv_sec = abstime->tv_sec - ts.tv_sec;
+      rt.tv_nsec = abstime->tv_nsec - ts.tv_nsec;
       if (rt.tv_nsec < 0)
         {
           rt.tv_nsec += 1000000000;
diff --git a/nptl/pthread_mutex_timedlock.c b/nptl/pthread_mutex_timedlock.c
index d4d11cc..10a9989 100644
--- a/nptl/pthread_mutex_timedlock.c
+++ b/nptl/pthread_mutex_timedlock.c
@@ -28,8 +28,9 @@
 
 #include <stap-probe.h>
 
-#ifndef lll_timedlock_elision
-#define lll_timedlock_elision(a,dummy,b,c) lll_timedlock(a, b, c)
+#ifndef lll_clocklock_elision
+#define lll_clocklock_elision(futex, adapt_count, clockid, abstime, private) \
+  lll_clocklock (futex, clockid, abstime, private)
 #endif
 
 #ifndef lll_trylock_elision
@@ -75,7 +76,7 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
 	}
 
       /* We have to get the mutex.  */
-      result = lll_timedlock (mutex->__data.__lock, abstime,
+      result = lll_clocklock (mutex->__data.__lock, CLOCK_REALTIME, abstime,
 			      PTHREAD_MUTEX_PSHARED (mutex));
 
       if (result != 0)
@@ -98,16 +99,16 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
       FORCE_ELISION (mutex, goto elision);
     simple:
       /* Normal mutex.  */
-      result = lll_timedlock (mutex->__data.__lock, abstime,
+      result = lll_clocklock (mutex->__data.__lock, CLOCK_REALTIME, abstime,
 			      PTHREAD_MUTEX_PSHARED (mutex));
       break;
 
     case PTHREAD_MUTEX_TIMED_ELISION_NP:
     elision: __attribute__((unused))
       /* Don't record ownership */
-      return lll_timedlock_elision (mutex->__data.__lock,
+      return lll_clocklock_elision (mutex->__data.__lock,
 				    mutex->__data.__spins,
-				    abstime,
+				    CLOCK_REALTIME, abstime,
 				    PTHREAD_MUTEX_PSHARED (mutex));
 
 
@@ -124,7 +125,8 @@ __pthread_mutex_timedlock (pthread_mutex_t *mutex,
 	    {
 	      if (cnt++ >= max_cnt)
 		{
-		  result = lll_timedlock (mutex->__data.__lock, abstime,
+		  result = lll_clocklock (mutex->__data.__lock,
+					  CLOCK_REALTIME, abstime,
 					  PTHREAD_MUTEX_PSHARED (mutex));
 		  break;
 		}