1 files changed, 66 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_unlock.c b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_unlock.c
new file mode 100644
index 0000000000..7c90c38049
--- /dev/null
+++ b/nptl/sysdeps/unix/sysv/solaris2/kopensolaris-gnu/rw_unlock.c
@@ -0,0 +1,66 @@
+/* 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_unlock (rwlock)
+      rwlock_t *rwlock;
+{
+  int errval = mutex_lock (&rwlock->mutex);
+  if (errval != 0)
+    return errval;
+
+  if (rwlock->readers & _RWLOCK_WR_LOCK)
+    {
+      /* Writer unlock.  */
+      if (__builtin_expect (rwlock->owner != (uintptr_t)THREAD_SELF, 0) ||
+            ((rwlock->type & LOCK_SHARED) && __builtin_expect (
+            rwlock->ownerpid != THREAD_GETMEM (THREAD_SELF, pid), 0)))
+        {
+          (void)mutex_unlock (&rwlock->mutex);
+          return EBUSY;
+        }
+      rwlock->owner = rwlock->ownerpid = 0;
+      rwlock->readers &= ~_RWLOCK_WR_LOCK;
+    }
+  else
+    {
+      /* Reader unlock.  */
+      if ((rwlock->readers & _RWLOCK_RD_MASK) == 0)
+        {
+          (void)mutex_unlock (&rwlock->mutex);
+          return EBUSY;
+        }
+      rwlock->readers = (rwlock->readers & _RWLOCK_WR_LOCK) |
+          ((rwlock->readers & _RWLOCK_RD_MASK) - 1);
+    }
+
+  /* Wake up a writer (if possible) or all readers.  */
+  if ((rwlock->readers & _RWLOCK_RD_MASK) == 0 &&
+        __cond_has_waiters (&rwlock->writercv))
+    errval = cond_signal (&rwlock->writercv);
+  else if (__cond_has_waiters (&rwlock->readercv))
+    errval = cond_broadcast (&rwlock->readercv);
+
+  (void)mutex_unlock (&rwlock->mutex);
+  return errval;
+}