1 files changed, 93 insertions, 0 deletions
diff --git a/linuxthreads/sysdeps/ia64/pspinlock.c b/linuxthreads/sysdeps/ia64/pspinlock.c
new file mode 100644
index 0000000000..ada28bd9f0
--- /dev/null
+++ b/linuxthreads/sysdeps/ia64/pspinlock.c
@@ -0,0 +1,93 @@
+/* POSIX spinlock implementation.  ia64 version.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Jes Sorensen <jes@linuxcare.com>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library 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>
+
+
+/* This implementation is inspired by the implementation used in the
+   Linux kernel. */
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  asm volatile
+    ("mov ar.ccv = r0\n\t"
+     "mov r3 = 1\n\t"
+     ";;\n"
+     "1:\n\t"
+     "ld4 r2 = %0\n\t"
+     ";;\n\t"
+     "cmp4.eq p0, p7 = r0, r2\n\t"
+     "(p7) br.cond.spnt.few 1b \n\t"
+     "cmpxchg4.acq r2 = %0, r3, ar.ccv\n\t"
+     ";;\n\t"
+     "cmp4.eq p0, p7 = r0, r2\n\t"
+     "(p7) br.cond.spnt.few 1b\n\t"
+     ";;\n"
+     :: "m" (lock) : "r2", "r3", "p7", "memory");
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  int oldval;
+
+  asm volatile
+    ("mov ar.ccv = r0\n\t"
+     "mov r2 = 1\n\t"
+     ";;\n\t"
+     "cmpxchg4.acq %0 = %1, r2, ar.ccv\n\t"
+     ";;\n"
+     : "=r" (oldval) : "m" (lock) : "r2", "memory");
+  return oldval > 0 ? 0 : EBUSY;
+}
+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)