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authorEric Andersen <andersen@codepoet.org>2003-02-27 18:13:05 +0000
committerEric Andersen <andersen@codepoet.org>2003-02-27 18:13:05 +0000
commit187dd78d7bd1c03fcf16e54a30314512d38e1a4a (patch)
tree9780638e5286b40da74a128c9f540a9ea720862f /libpthread/linuxthreads/sysdeps/i386/i686
parentd4d6e2c50565da18253cd0d6f3332484142b6587 (diff)
Major update for pthreads, based in large part on improvements
from glibc 2.3. This should make threads much more efficient. -Erik
Diffstat (limited to 'libpthread/linuxthreads/sysdeps/i386/i686')
-rw-r--r--libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h38
1 files changed, 25 insertions, 13 deletions
diff --git a/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h b/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h
index 8d9ea709b..3596224c1 100644
--- a/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h
+++ b/libpthread/linuxthreads/sysdeps/i386/i686/pt-machine.h
@@ -1,45 +1,51 @@
/* Machine-dependent pthreads configuration and inline functions.
i686 version.
- Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1996-2001, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson <rth@tamu.edu>.
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
+ 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
- Library General Public License for more details.
+ Lesser General Public License for more details.
- You should have received a copy of the GNU Library General Public
+ 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. */
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H 1
+
#ifndef PT_EI
# define PT_EI extern inline
#endif
+#include "kernel-features.h"
+#ifndef ASSEMBLER
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
-#define CURRENT_STACK_FRAME stack_pointer
-register char * stack_pointer __asm__ ("%esp");
+#define CURRENT_STACK_FRAME __builtin_frame_address (0)
/* Spinlock implementation; required. */
-PT_EI int
+PT_EI long int
testandset (int *spinlock)
{
- int ret;
+ long int ret;
__asm__ __volatile__ (
"xchgl %0, %1"
- : "=r"(ret), "=m"(*spinlock)
- : "0"(1), "m"(*spinlock)
+ : "=r" (ret), "=m" (*spinlock)
+ : "0" (1), "m" (*spinlock)
: "memory");
return ret;
@@ -61,7 +67,13 @@ __compare_and_swap (long int *p, long int oldval, long int newval)
: "memory");
return ret;
}
+#endif
+
+#if __ASSUME_LDT_WORKS > 0
+#include "../useldt.h"
+#endif
+/* The P4 and above really want some help to prevent overheating. */
+#define BUSY_WAIT_NOP __asm__ ("rep; nop")
-/* Use the LDT implementation only if the kernel is fixed. */
-//#include "../useldt.h"
+#endif /* pt-machine.h */