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Diffstat (limited to 'libpthread/linuxthreads/sysdeps/nds32/pspinlock.c')
-rw-r--r--libpthread/linuxthreads/sysdeps/nds32/pspinlock.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
new file mode 100644
index 000000000..f8adf07be
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* POSIX spinlock implementation.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+
+ 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; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+ unsigned int val ;
+ unsigned int temp ;
+ unsigned int offset = 0 ;
+
+ __asm__ __volatile__ (
+ "1:\n\t"
+ "llw %0, [%1 + %2 << 0]\n\t"
+ "bnez %0, 1b\n\t"
+ "movi %3, #0x1\n\t"
+ "scw %3, [%1 + %2 << 0]\n\t"
+ "beqz %3, 1b\n\t"
+ : "=&r" (val)
+ : "r" (lock), "r" (offset), "r" (temp)
+ : "memory" ) ;
+
+ return 0 ;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+ unsigned int val ;
+ unsigned int temp ;
+ unsigned int offset = 0 ;
+
+ __asm__ __volatile__ (
+ "llw %0, [%1 + %2 << 0]\n\t"
+ "bnez %0, 1f\n\t"
+ "movi %3, #0x1\n\t"
+ "scw %3, [%1 + %2 << 0]\n\t"
+ "beqz %3, 1f\n\t"
+ "movi %0, #0x0\n\t"
+ "b 2f\n\t"
+ "1:\n\t"
+ "movi %0, #16\n\t"
+ "2:\n\t"
+ : "=&r" (val)
+ : "r" (lock), "r" (offset), "r" (temp)
+ : "memory" ) ;
+
+ return val;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+ return *lock = 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. */
+ return *lock = 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)