Spinlock implementation for Alpha.

diff --git a/sysdeps/alpha/nptl/pthread_spin_lock.S b/sysdeps/alpha/nptl/pthread_spin_lock.S
new file mode 100644 (file)
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+++ b/sysdeps/alpha/nptl/pthread_spin_lock.S
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+/* Copyright (C) 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson  <rth@twiddle.net>, 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+
+       .text
+       .align  4
+
+       .globl  pthread_spin_lock
+       .ent    pthread_spin_lock
+pthread_spin_lock:
+       .frame  $sp, 0, $26, 0
+       .prologue 0
+
+0:     ldl_l   $1, 0($16)
+       lda     $2, 1
+       lda     $0, 0
+       bne     $1, 1f
+
+       stl_c   $2, 0($16)
+       beq     $2, 1f
+       mb
+       ret
+
+1:     ldl     $1, 0($16)
+       bne     $1, 1b
+       unop
+       br      0b
+
+       .end    pthread_spin_lock