1 files changed, 73 insertions, 0 deletions
diff --git a/libpthread/nptl/pthread_condattr_setclock.c b/libpthread/nptl/pthread_condattr_setclock.c
new file mode 100644
index 000000000..87597c8b5
--- /dev/null
+++ b/libpthread/nptl/pthread_condattr_setclock.c
@@ -0,0 +1,73 @@
+/* Copyright (C) 2003, 2004, 2007, 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+   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 <assert.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <time.h>
+#include <sysdep.h>
+#include "pthreadP.h"
+#include <bits/kernel-features.h>
+
+
+int
+pthread_condattr_setclock (
+     pthread_condattr_t *attr,
+     clockid_t clock_id)
+{
+  /* Only a few clocks are allowed.  CLOCK_REALTIME is always allowed.
+     CLOCK_MONOTONIC only if the kernel has the necessary support.  */
+  if (clock_id == CLOCK_MONOTONIC)
+    {
+#ifndef __ASSUME_POSIX_TIMERS
+# ifdef __NR_clock_getres
+      /* Check whether the clock is available.  */
+      static int avail;
+
+      if (avail == 0)
+	{
+	  struct timespec ts;
+
+	  INTERNAL_SYSCALL_DECL (err);
+	  int val;
+	  val = INTERNAL_SYSCALL (clock_getres, err, 2, CLOCK_MONOTONIC, &ts);
+	  avail = INTERNAL_SYSCALL_ERROR_P (val, err) ? -1 : 1;
+	}
+
+      if (avail < 0)
+# endif
+	/* Not available.  */
+	return EINVAL;
+#endif
+    }
+  else if (clock_id != CLOCK_REALTIME)
+    /* If more clocks are allowed some day the storing of the clock ID
+       in the pthread_cond_t structure needs to be adjusted.  */
+    return EINVAL;
+
+  /* Make sure the value fits in the bits we reserved.  */
+  assert (clock_id < (1 << COND_NWAITERS_SHIFT));
+
+  int *valuep = &((struct pthread_condattr *) attr)->value;
+
+  *valuep = ((*valuep & ~(((1 << COND_NWAITERS_SHIFT) - 1) << 1))
+	     | (clock_id << 1));
+
+  return 0;
+}