1 files changed, 50 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_tryrdlock.c b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_tryrdlock.c
new file mode 100644
index 0000000000..e5b8bf5390
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_tryrdlock.c
@@ -0,0 +1,50 @@
+/* Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
+
+   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 <pthreadP.h>
+#include <synch.h>
+
+
+int rw_tryrdlock (rwlock)
+      rwlock_t *rwlock;
+{
+  int errval = mutex_trylock (&rwlock->mutex);
+  if (errval != 0)
+    return errval;
+
+  if ((rwlock->readers & _RWLOCK_WR_LOCK) ||
+        (__cond_has_waiters (&rwlock->writercv) &&
+        !PTHREAD_RWLOCK_PREFER_READER_P (rwlock)))
+    {
+      (void)mutex_unlock (&rwlock->mutex);
+      return EBUSY;
+    }
+
+  /* Increment readers (note that no other bits are set).  */
+  if (rwlock->readers == _RWLOCK_RD_MAX)
+    {
+      (void)mutex_unlock (&rwlock->mutex);
+      return EAGAIN;
+    }
+  rwlock->readers++;
+
+  (void)mutex_unlock (&rwlock->mutex);
+  return 0;
+}