CRIS port 7/8: linuxthreads/sysdeps/cris
Hans-Peter Nilsson
hans-peter.nilsson@axis.com
Sun Apr 8 19:02:00 GMT 2001
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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