2005-04-27 Roland McGrath <roland@redhat.com>

	* sysdeps/unix/sysv/linux/kernel-posix-cpu-timers.h: New file.
	* sysdeps/unix/sysv/linux/clock_getcpuclockid.c: New file.
	* sysdeps/unix/sysv/linux/ia64/clock_getcpuclockid.c
	(HAS_CPUCLOCK): New macro.
	(clock_getcpuclockid): Function removed.
	#include the new linux file to define it instead.
	* sysdeps/unix/clock_gettime.c [HP_TIMING_AVAIL] (hp_timing_gettime):
	New function, broken out of ...
	(clock_gettime) [HP_TIMING_AVAIL]: ... here.  Call it.
	(realtime_gettime): New function, broken out of ...
	(clock_gettime) [! HANDLED_REALTIME]: ... here.  Call it.
	(clock_gettime) [SYSDEP_GETTIME_CPU]: Use new macro in default case.
	* sysdeps/unix/sysv/linux/clock_gettime.c (SYSCALL_GETTIME): New macro.
	(SYSDEP_GETTIME_CPUTIME): New macro.
	(SYSDEP_GETTIME): Use both.
	[! __ASSUME_POSIX_TIMERS] (maybe_syscall_gettime): New function, broken
	out of ...
	(SYSDEP_GETTIME): ... here.  Use it.
	[__NR_clock_gettime] (HANDLED_CPUTIME): Define it.
	(SYSDEP_GETTIME_CPUTIME): New macro.  Handle CPU timers by trying
	kernel support and falling back to hp-timing code.
	* sysdeps/posix/clock_getres.c
	[HP_TIMING_AVAIL] (hp_timing_getres): New function, broken out of ...
	(clock_getres) [HP_TIMING_AVAIL]: ... here.  Call it.
	(realtime_getres): New function, broken out of ...
	(clock_getres) [! HANDLED_REALTIME]: ... here.  Call it.
	(clock_getres) [SYSDEP_GETRES_CPU]: Use new macro in default case.
	* sysdeps/unix/sysv/linux/clock_getres.c (SYSCALL_GETRES): New macro.
	(SYSDEP_GETRES_CPUTIME): New macro.
	(SYSDEP_GETRES): Use both.
	[! __ASSUME_POSIX_TIMERS] (maybe_syscall_getres): New function, broken
	out of ...
	(SYSDEP_GETRES): ... here.  Use it.
	[__NR_clock_getres] (HANDLED_CPUTIME): Define it.
	(SYSDEP_GETRES_CPUTIME): New macro.  Handle CPU timers by trying
	kernel support and falling back to hp-timing code.
	* sysdeps/unix/sysv/linux/clock_nanosleep.c: Handle
	CLOCK_PROCESS_CPUTIME_ID and CLOCK_PROCESS_THREAD_ID specially,
	translating to the kernel clockid_t for our own process/thread clock.

1 files changed, 60 insertions, 51 deletions

diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c
index a2d466607e..f4dc21f8af 100644
--- a/sysdeps/posix/clock_getres.c
+++ b/sysdeps/posix/clock_getres.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
+/* clock_getres -- Get the resolution of a POSIX clockid_t.
+   Copyright (C) 1999, 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -24,11 +25,55 @@
 #include <libc-internal.h>
 
 
-#if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
-/* Clock frequency of the processor.  */
-static long int nsec;
+#if HP_TIMING_AVAIL
+static long int nsec;		/* Clock frequency of the processor.  */
+
+static inline int
+hp_timing_getres (struct timespec *res)
+{
+  if (__builtin_expect (nsec == 0, 0))
+    {
+      hp_timing_t freq;
+
+      /* This can only happen if we haven't initialized the `nsec'
+	 variable yet.  Do this now.  We don't have to protect this
+	 code against multiple execution since all of them should
+	 lead to the same result.  */
+      freq = __get_clockfreq ();
+      if (__builtin_expect (freq == 0, 0))
+	/* Something went wrong.  */
+	return -1;
+
+      nsec = MAX (UINT64_C (1000000000) / freq, 1);
+    }
+
+  /* Fill in the values.
+     The seconds are always zero (unless we have a 1Hz machine).  */
+  res->tv_sec = 0;
+  res->tv_nsec = nsec;
+
+  return 0;
+}
 #endif
 
+static inline int
+realtime_getres (struct timespec *res)
+{
+  long int clk_tck = sysconf (_SC_CLK_TCK);
+
+  if (__builtin_expect (clk_tck != -1, 1))
+    {
+      /* This implementation assumes that the realtime clock has a
+	 resolution higher than 1 second.  This is the case for any
+	 reasonable implementation.  */
+      res->tv_sec = 0;
+      res->tv_nsec = 1000000000 / clk_tck;
+      return 0;
+    }
+
+  return -1;
+}
+
 
 /* Get resolution of clock.  */
 int
@@ -38,69 +83,33 @@ clock_getres (clockid_t clock_id, struct timespec *res)
 
   switch (clock_id)
     {
-#define HANDLE_REALTIME \
-      do {								      \
-	long int clk_tck = sysconf (_SC_CLK_TCK);			      \
-									      \
-	if (__builtin_expect (clk_tck != -1, 1))			      \
-	  {								      \
-	    /* This implementation assumes that the realtime clock has a      \
-	       resolution higher than 1 second.  This is the case for any     \
-	       reasonable implementation.  */				      \
-	    res->tv_sec = 0;						      \
-	    res->tv_nsec = 1000000000 / clk_tck;			      \
-									      \
-	    retval = 0;							      \
-	  }								      \
-      } while (0)
-
 #ifdef SYSDEP_GETRES
       SYSDEP_GETRES;
 #endif
 
 #ifndef HANDLED_REALTIME
     case CLOCK_REALTIME:
-      HANDLE_REALTIME;
+      retval = realtime_getres (res);
       break;
 #endif	/* handled REALTIME */
 
     default:
+#ifdef SYSDEP_GETRES_CPU
+      SYSDEP_GETRES_CPU;
+#endif
 #if HP_TIMING_AVAIL
       if ((clock_id & ((1 << CLOCK_IDFIELD_SIZE) - 1))
-	  != CLOCK_THREAD_CPUTIME_ID)
+	  == CLOCK_THREAD_CPUTIME_ID)
+	retval = hp_timing_getres (res);
+      else
 #endif
-	{
-	  __set_errno (EINVAL);
-	  break;
-	}
+	__set_errno (EINVAL);
+      break;
 
 #if HP_TIMING_AVAIL && !defined HANDLED_CPUTIME
-      /* FALLTHROUGH.  */
     case CLOCK_PROCESS_CPUTIME_ID:
-      {
-	if (__builtin_expect (nsec == 0, 0))
-	  {
-	    hp_timing_t freq;
-
-	    /* This can only happen if we haven't initialized the `freq'
-	       variable yet.  Do this now. We don't have to protect this
-	       code against multiple execution since all of them should
-	       lead to the same result.  */
-	    freq = __get_clockfreq ();
-	    if (__builtin_expect (freq == 0, 0))
-	      /* Something went wrong.  */
-	      break;
-
-	    nsec = MAX (UINT64_C (1000000000) / freq, 1);
-	  }
-
-	/* File in the values.  The seconds are always zero (unless we
-	   have a 1Hz machine).  */
-	res->tv_sec = 0;
-	res->tv_nsec = nsec;
-
-	retval = 0;
-      }
+    case CLOCK_THREAD_CPUTIME_ID:
+      retval = hp_timing_getres (res);
       break;
 #endif
     }