zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/build/uClibc/libpthread/nptl/pthread_rwlock_init.c b/ap/build/uClibc/libpthread/nptl/pthread_rwlock_init.c
new file mode 100644
index 0000000..6cbdd97
--- /dev/null
+++ b/ap/build/uClibc/libpthread/nptl/pthread_rwlock_init.c
@@ -0,0 +1,73 @@
+/* Copyright (C) 2002, 2007, 2009 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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 "pthreadP.h"
+#include <bits/kernel-features.h>
+#include <string.h>
+
+static const struct pthread_rwlockattr default_attr =
+ {
+ .lockkind = PTHREAD_RWLOCK_DEFAULT_NP,
+ .pshared = PTHREAD_PROCESS_PRIVATE
+ };
+
+
+int
+__pthread_rwlock_init (
+ pthread_rwlock_t *rwlock,
+ const pthread_rwlockattr_t *attr)
+{
+ const struct pthread_rwlockattr *iattr;
+
+ iattr = ((const struct pthread_rwlockattr *) attr) ?: &default_attr;
+
+ memset (rwlock, '\0', sizeof (*rwlock));
+
+ rwlock->__data.__flags
+ = iattr->lockkind == PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP;
+
+ /* The __SHARED field is computed to minimize the work that needs to
+ be done while handling the futex. There are two inputs: the
+ availability of private futexes and whether the rwlock is shared
+ or private. Unfortunately the value of a private rwlock is
+ fixed: it must be zero. The PRIVATE_FUTEX flag has the value
+ 0x80 in case private futexes are available and zero otherwise.
+ This leads to the following table:
+
+ | pshared | result
+ | shared private | shared private |
+ ------------+-----------------+-----------------+
+ !avail 0 | 0 0 | 0 0 |
+ avail 0x80 | 0x80 0 | 0 0x80 |
+
+ If the pshared value is in locking functions XORed with avail
+ we get the expected result. */
+#ifdef __ASSUME_PRIVATE_FUTEX
+ rwlock->__data.__shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
+ ? 0 : FUTEX_PRIVATE_FLAG);
+#else
+ rwlock->__data.__shared = (iattr->pshared == PTHREAD_PROCESS_PRIVATE
+ ? 0
+ : THREAD_GETMEM (THREAD_SELF,
+ header.private_futex));
+#endif
+
+ return 0;
+}
+strong_alias (__pthread_rwlock_init, pthread_rwlock_init)