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CRIS port 7/8: linuxthreads/sysdeps/cris


The last main dish: linuxthreads.

2001-04-08  Hans-Peter Nilsson  <hp@axis.com>

	* sysdeps/cris/pt-machine.h: New file.
	* sysdeps/cris/pspinlock.c: New file.

diff -cpNr linuxthreads/sysdeps/cris.empty/pspinlock.c linuxthreads/sysdeps/cris/pspinlock.c
*** linuxthreads/sysdeps/cris.empty/pspinlock.c	Thu Jan  1 01:00:00 1970
--- linuxthreads/sysdeps/cris/pspinlock.c	Tue Feb 27 01:04:31 2001
***************
*** 0 ****
--- 1,72 ----
+ /* POSIX spinlock implementation.  CRIS version.
+    Copyright (C) 2000, 2001 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 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>
+ #include "internals.h"
+ 
+ /* FIXME: These are just dummies.  I don't know why or if they're needed;
+    configury should default to these definitions.  We just follow the
+    crowd here.  */
+ 
+ int
+ __pthread_spin_lock (pthread_spinlock_t *lock)
+ {
+   while (testandset (lock) != 0)
+     ;
+ 
+   return 0;
+ }
+ weak_alias (__pthread_spin_lock, pthread_spin_lock)
+ 
+ 
+ int
+ __pthread_spin_trylock (pthread_spinlock_t *lock)
+ {
+   return testandset (lock) != 0 ? EBUSY : 0;
+ }
+ 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)
diff -cpNr linuxthreads/sysdeps/cris.empty/pt-machine.h linuxthreads/sysdeps/cris/pt-machine.h
*** linuxthreads/sysdeps/cris.empty/pt-machine.h	Thu Jan  1 01:00:00 1970
--- linuxthreads/sysdeps/cris/pt-machine.h	Tue Feb 27 00:21:37 2001
***************
*** 0 ****
--- 1,50 ----
+ /* Machine-dependent pthreads configuration and inline functions.
+    CRIS version.
+    Copyright (C) 2001 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 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.  */
+ 
+ #ifndef PT_EI
+ # define PT_EI extern inline
+ #endif
+ 
+ PT_EI long int
+ testandset (int *spinlock)
+ {
+   register unsigned long int ret;
+ 
+   /* Note the use of a dummy output of *spinlock to expose the write.  The
+      memory barrier is to stop *other* writes being moved past this code.  */
+   __asm__ __volatile__("clearf\n"
+ 		       "0:\n\t"
+ 		       "movu.b [%2],%0\n\t"
+ 		       "ax\n\t"
+ 		       "move.b %3,[%2]\n\t"
+ 		       "bwf 0b\n\t"
+ 		       "clearf"
+ 		       : "=&r" (ret), "=m" (*spinlock)
+ 		       : "r" (spinlock), "r" ((int) 1)
+ 		       : "memory");
+   return ret;
+ }
+ 
+ 
+ /* Get some notion of the current stack.  Need not be exactly the top
+    of the stack, just something somewhere in the current frame.
+    I don't trust register variables, so let's do this the safe way.  */
+ #define CURRENT_STACK_FRAME \
+  ({ char *sp; __asm__ ("move.d $sp,%0" : "=rm" (sp)); sp; })

brgds, H-P


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