From baf051ca35b40c73e98f4b5246be50209cd966a6 Mon Sep 17 00:00:00 2001
From: Jeff Johnston <jjohnstn@redhat.com>
Date: Thu, 27 Jun 2002 20:09:26 +0000
Subject: 2002-06-27  Jeff Johnston  <jjohnstn@redhat.com>

        * libc/sys/linux/Makefile.am: Add new clock routines.
        * libc/sys/linux/Makefile.in: Regenerated.
        * libc/sys/linux/clock_getres.c: New file.
        * libc/sys/linux/clock_gettime.c: Ditto.
        * libc/sys/linux/clock_settime.c: Ditto.
        * libc/sys/linux/hp-timing.h: Ditto.
        * libc/sys/linux/libc-internal.h: Ditto.
        * libc/sys/linux/sysconf.c: Fix typo.
        * libc/sys/linux/include/time.h: New file.
        * libc/sys/linux/machine/hp-timing.h: New file.
        * libc/sys/linux/machine/i386/Makefile.am: Add new files.
        * libc/sys/linux/machine/i386/Makefile.in: Regenerated.
        * libc/sys/linux/machine/i386/get_clockfreq.c: New file.
        * libc/sys/linux/machine/i386/hp-timing.c: Ditto.
        * libc/sys/linux/machine/i386/hp-timing.h: Ditto.
        * libc/sys/linux/sys/linux_time.h: Ditto.
        * libc/sys/linux/sys/time.h: Remove include of <linux/time.h> and
        replace with <sys/linux_time.h>.
---
 newlib/libc/sys/linux/clock_settime.c | 111 ++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 newlib/libc/sys/linux/clock_settime.c

(limited to 'newlib/libc/sys/linux/clock_settime.c')

diff --git a/newlib/libc/sys/linux/clock_settime.c b/newlib/libc/sys/linux/clock_settime.c
new file mode 100644
index 000000000..79a9b564a
--- /dev/null
+++ b/newlib/libc/sys/linux/clock_settime.c
@@ -0,0 +1,111 @@
+/* Copyright (C) 1999, 2000, 2001 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <libc-internal.h>
+
+
+#if HP_TIMING_AVAIL
+/* Clock frequency of the processor.  We make it a 64-bit variable
+   because some jokers are already playing with processors with more
+   than 4GHz.  */
+static hp_timing_t freq;
+
+
+/* We need the starting time for the process.  */
+extern hp_timing_t _dl_cpuclock_offset;
+
+
+/* This function is defined in the thread library.  */
+extern void __pthread_clock_settime (hp_timing_t offset)
+     __attribute__ ((__weak__));
+#endif
+
+
+/* Set CLOCK to value TP.  */
+int
+clock_settime (clockid_t clock_id, const struct timespec *tp)
+{
+  struct timeval tv;
+  int retval;
+
+  /* Make sure the time cvalue is OK.  */
+  if (tp->tv_nsec < 0 || tp->tv_nsec >= 1000000000)
+    {
+      __set_errno (EINVAL);
+      return -1;
+    }
+
+  switch (clock_id)
+    {
+    case CLOCK_REALTIME:
+      TIMESPEC_TO_TIMEVAL (&tv, tp);
+
+      retval = settimeofday (&tv, NULL);
+      break;
+
+#if HP_TIMING_AVAIL
+    case CLOCK_PROCESS_CPUTIME_ID:
+    case CLOCK_THREAD_CPUTIME_ID:
+      {
+	hp_timing_t tsc;
+	hp_timing_t usertime;
+
+	/* First thing is to get the current time.  */
+	HP_TIMING_NOW (tsc);
+
+	if (__builtin_expect (freq == 0, 0))
+	  {
+	    /* 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.  */
+		retval = -1;
+		break;
+	      }
+	  }
+
+	/* Convert the user-provided time into CPU ticks.  */
+	usertime = tp->tv_sec * freq + (tp->tv_nsec * freq) / 1000000000ull;
+
+	/* Determine the offset and use it as the new base value.  */
+	if (clock_id != CLOCK_THREAD_CPUTIME_ID
+	    || __pthread_clock_settime == NULL)
+	  _dl_cpuclock_offset = tsc - usertime;
+	else
+	  __pthread_clock_settime (tsc - usertime);
+
+	retval = 0;
+      }
+      break;
+#endif
+
+    default:
+      __set_errno (EINVAL);
+      retval = -1;
+      break;
+    }
+
+  return retval;
+}
-- 
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