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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/linuxthreads/sysdeps/sparc/pspinlock.c
parenta5352e212fcd4da83c8ff4fe542ef23c8e3187f8 (diff)
parent6d550ddd129b18cf800eab604f74536754526cd8 (diff)
Merge remote-tracking branch 'origin/upstream'
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/sparc/pspinlock.c')
-rw-r--r--libpthread/linuxthreads/sysdeps/sparc/pspinlock.c95
1 files changed, 84 insertions, 11 deletions
diff --git a/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c b/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c
index 72a9af5b1..4de152be3 100644
--- a/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c
+++ b/libpthread/linuxthreads/sysdeps/sparc/pspinlock.c
@@ -1,14 +1,87 @@
-#include <features.h>
-#include <bits/wordsize.h>
+/* POSIX spinlock implementation. SPARC32 version.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
-#if __WORDSIZE == 32
+ 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.
-# if defined(__CONFIG_SPARC_V9B__)
-# include "sparc32/sparcv9b/pspinlock.c"
-# else
-# include "sparc32/pspinlock.c"
-# endif
+ 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.
-#else
-# include "sparc64/pspinlock.c"
-#endif
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+/* This implementation is similar to the one used in the Linux kernel. */
+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;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+ int result;
+ __asm__ __volatile__
+ ("ldstub [%1], %0"
+ : "=r" (result)
+ : "r" (lock)
+ : "memory");
+ return result == 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+ *lock = 0;
+ return 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+ /* We can ignore the `pshared' parameter. Since we are busy-waiting
+ all processes which can access the memory location `lock' points
+ to can use the spinlock. */
+ *lock = 0;
+ return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+ /* Nothing to do. */
+ return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)