* rt/tst-cpuclock1.c: New file.

	* rt/tst-cpuclock2.c: New file.
	* rt/tst-cputimer1.c: New file.
	* rt/tst-cputimer2.c: New file.
	* rt/tst-cputimer3.c: New file.
	* rt/Makefile (tests): Add them.

	* 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.

2 files changed, 73 insertions, 1 deletions

diff --git a/linuxthreads/ChangeLog b/linuxthreads/ChangeLog
index 868b4de424..20120372f4 100644
--- a/linuxthreads/ChangeLog
+++ b/linuxthreads/ChangeLog
@@ -1,3 +1,8 @@
+2005-04-27  Roland McGrath  <roland@redhat.com>
+
+	* sysdeps/pthread/getcpuclockid.c (pthread_getcpuclockid)
+	[__NR_clock_getres]: Use kernel-supplied CPU clocks if available.
+
 2005-03-31  Jakub Jelinek  <jakub@redhat.com>
 
 	* sysdeps/unix/sysv/linux/x86_64/sysdep-cancel.h: Use
diff --git a/linuxthreads/sysdeps/pthread/getcpuclockid.c b/linuxthreads/sysdeps/pthread/getcpuclockid.c
index 032caeb081..117c22dd37 100644
--- a/linuxthreads/sysdeps/pthread/getcpuclockid.c
+++ b/linuxthreads/sysdeps/pthread/getcpuclockid.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 2000, 2001, 2004 Free Software Foundation, Inc.
+/* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t.  Linux version
+   Copyright (C) 2000, 2001, 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
@@ -21,10 +22,76 @@
 #include <sys/time.h>
 #include <time.h>
 #include <internals.h>
+#include "kernel-features.h"
+#include "posix-cpu-timers.h"
+
+
+#if !(__ASSUME_POSIX_CPU_TIMERS > 0)
+int __libc_missing_posix_cpu_timers attribute_hidden;
+#endif
+#if !(__ASSUME_POSIX_TIMERS > 0)
+int __libc_missing_posix_timers attribute_hidden;
+#endif
 
 int
 pthread_getcpuclockid (pthread_t thread_id, clockid_t *clock_id)
 {
+#ifdef __NR_clock_getres
+  pthread_handle handle = thread_handle(thread_id);
+  int pid;
+
+  __pthread_lock (&handle->h_lock, NULL);
+  if (nonexisting_handle (handle, thread_id))
+    {
+      __pthread_unlock (&handle->h_lock);
+      return ESRCH;
+    }
+  pid = handle->h_descr->p_pid;
+  __pthread_unlock (&handle->h_lock);
+
+  /* The clockid_t value is a simple computation from the PID.
+     But we do a clock_getres call to validate it if we aren't
+     yet sure we have the kernel support.  */
+
+  const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED);
+
+# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
+#  if !(__ASSUME_POSIX_TIMERS > 0)
+  if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers)
+    __libc_missing_cpu_posix_timers = 1;
+#  endif
+  if (!__libc_missing_posix_cpu_timers)
+    {
+      INTERNAL_SYSCALL_DECL (err);
+      int r = INTERNAL_SYSCALL (clock_getres, err, 2, tidclock, NULL);
+      if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+# endif
+	{
+	  *clock_id = pidclock;
+	  return 0;
+	}
+
+# if !(__ASSUME_POSIX_CPU_TIMERS > 0)
+#  if !(__ASSUME_POSIX_TIMERS > 0)
+      if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS)
+	{
+	  /* The kernel doesn't support these calls at all.  */
+	  __libc_missing_posix_timers = 1;
+	  __libc_missing_posix_cpu_timers = 1;
+	}
+      else
+#  endif
+	if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL)
+	  {
+	    /* The kernel doesn't support these clocks at all.  */
+	    __libc_missing_posix_cpu_timers = 1;
+	  }
+      else
+	return INTERNAL_SYSCALL_ERRNO (r, err);
+    }
+# endif
+#endif
+
 #ifdef CLOCK_THREAD_CPUTIME_ID
   /* We need to store the thread ID in the CLOCKID variable together
      with a number identifying the clock.  We reserve the low 3 bits