1 files changed, 109 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/clock_gettime.c b/newlib/libc/sys/linux/clock_gettime.c
new file mode 100644
index 000000000..a86786bb2
--- /dev/null
+++ b/newlib/libc/sys/linux/clock_gettime.c
@@ -0,0 +1,109 @@
+/* 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 <stdint.h>
+#include <time.h>
+#include <sys/time.h>
+#include <libc-internal.h>
+#include <hp-timing.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 int __pthread_clock_gettime (hp_timing_t freq, struct timespec *tp)
+     __attribute__ ((__weak__));
+#endif
+
+
+/* Get current value of CLOCK and store it in TP.  */
+int
+clock_gettime (clockid_t clock_id, struct timespec *tp)
+{
+  struct timeval tv;
+  int retval = -1;
+
+  switch (clock_id)
+    {
+    case CLOCK_REALTIME:
+      retval = gettimeofday (&tv, NULL);
+      if (retval == 0)
+	/* Convert into `timespec'.  */
+	TIMEVAL_TO_TIMESPEC (&tv, tp);
+      break;
+
+#if HP_TIMING_AVAIL
+    case CLOCK_PROCESS_CPUTIME_ID:
+    case CLOCK_THREAD_CPUTIME_ID:
+      {
+	hp_timing_t 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.  */
+	      break;
+	  }
+
+	if (clock_id == CLOCK_THREAD_CPUTIME_ID
+	    && __pthread_clock_gettime != NULL)
+	  {
+	    retval = __pthread_clock_gettime (freq, tp);
+	    break;
+	  }
+
+	/* Get the current counter.  */
+	HP_TIMING_NOW (tsc);
+
+	/* Compute the offset since the start time of the process.  */
+	tsc -= _dl_cpuclock_offset;
+
+	/* Compute the seconds.  */
+	tp->tv_sec = tsc / freq;
+
+	/* And the nanoseconds.  This computation should be stable until
+	   we get machines with about 16GHz frequency.  */
+	tp->tv_nsec = ((tsc % freq) * UINT64_C (1000000000)) / freq;
+
+	retval = 0;
+      }
+    break;
+#endif
+
+    default:
+      __set_errno (EINVAL);
+      break;
+    }
+
+  return retval;
+}