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authorWaldemar Brodkorb <wbx@openadk.org>2014-09-04 15:18:54 +0200
committerWaldemar Brodkorb <wbx@openadk.org>2014-09-04 15:18:54 +0200
commit36043b37739dffdaea8d31457570810e492268d7 (patch)
tree0045cba85b862ecca89cf7b5aff336bddbabad89 /libpthread/nptl/sysdeps/pthread_spin_lock.c
parenta5352e212fcd4da83c8ff4fe542ef23c8e3187f8 (diff)
parent6d550ddd129b18cf800eab604f74536754526cd8 (diff)
Merge remote-tracking branch 'origin/upstream'
Diffstat (limited to 'libpthread/nptl/sysdeps/pthread_spin_lock.c')
-rw-r--r--libpthread/nptl/sysdeps/pthread_spin_lock.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/pthread_spin_lock.c b/libpthread/nptl/sysdeps/pthread_spin_lock.c
new file mode 100644
index 000000000..2dfcd3c24
--- /dev/null
+++ b/libpthread/nptl/sysdeps/pthread_spin_lock.c
@@ -0,0 +1,39 @@
+/* Copyright (C) 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Jakub Jelinek <jakub@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, see
+ <http://www.gnu.org/licenses/>. */
+
+#include "pthreadP.h"
+
+int
+pthread_spin_lock (pthread_spinlock_t *lock)
+{
+ __asm__ __volatile__
+ ("1: ldstub [%0], %%g2\n"
+ " orcc %%g2, 0x0, %%g0\n"
+ " bne,a 2f\n"
+ " ldub [%0], %%g2\n"
+ ".subsection 2\n"
+ "2: orcc %%g2, 0x0, %%g0\n"
+ " bne,a 2b\n"
+ " ldub [%0], %%g2\n"
+ " b,a 1b\n"
+ ".previous"
+ : /* no outputs */
+ : "r" (lock)
+ : "g2", "memory", "cc");
+ return 0;
+}