1 files changed, 98 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/mips/pspinlock.c b/linuxthreads/sysdeps/mips/pspinlock.c
new file mode 100644
index 0000000000..350aa7553c
--- /dev/null
+++ b/linuxthreads/sysdeps/mips/pspinlock.c
@@ -0,0 +1,98 @@
+/* POSIX spinlock implementation.  MIPS version.
+   Copyright (C) 2000, 2002, 2003, 2004 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <sgidefs.h>
+#include <sys/tas.h>
+#include "internals.h"
+
+#include <sgidefs.h>
+
+/* This implementation is similar to the one used in the Linux kernel.  */
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  unsigned int tmp1, tmp2;
+
+  asm volatile
+    ("\t\t\t# spin_lock\n"
+     "1:\n\t"
+     ".set	push\n\t"
+#if _MIPS_SIM == _ABIO32
+     ".set	mips2\n\t"
+#endif
+     "ll	%1,%3\n\t"
+     "li	%2,1\n\t"
+     "bnez	%1,1b\n\t"
+     "sc	%2,%0\n\t"
+     ".set	pop\n\t"
+     "beqz	%2,1b"
+     : "=m" (*lock), "=&r" (tmp1), "=&r" (tmp2)
+     : "m" (*lock)
+     : "memory");
+
+  return 0;
+}
+
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  /* To be done.  */
+  return 0;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  asm volatile
+    ("\t\t\t# spin_unlock\n\t"
+     "sw	$0,%0"
+     : "=m" (*lock)
+     :
+     : "memory");
+  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)