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authorEric Andersen <andersen@codepoet.org>2003-03-03 20:58:42 +0000
committerEric Andersen <andersen@codepoet.org>2003-03-03 20:58:42 +0000
commit67eff66438688fddebe41f77fd252a3b2b135271 (patch)
tree18dbee3e9afe50d27095140198e2aa34df1de061 /libc/sysdeps/linux/i386/bits/atomicity.h
parent2229d0fa131387b9b8ad16ac88347350a080aeb5 (diff)
Initial effort at adding profiling support.
Diffstat (limited to 'libc/sysdeps/linux/i386/bits/atomicity.h')
-rw-r--r--libc/sysdeps/linux/i386/bits/atomicity.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/bits/atomicity.h b/libc/sysdeps/linux/i386/bits/atomicity.h
new file mode 100644
index 000000000..df2fb8184
--- /dev/null
+++ b/libc/sysdeps/linux/i386/bits/atomicity.h
@@ -0,0 +1,57 @@
+/* Low-level functions for atomic operations. ix86 version, x >= 4.
+ Copyright (C) 1997, 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 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. */
+
+#ifndef _ATOMICITY_H
+#define _ATOMICITY_H 1
+
+#include <inttypes.h>
+
+
+static inline uint32_t
+__attribute__ ((unused))
+exchange_and_add (volatile uint32_t *mem, uint32_t val)
+{
+ register uint32_t result;
+ __asm__ __volatile__ ("lock; xaddl %0,%1"
+ : "=r" (result), "=m" (*mem) : "0" (val), "1" (*mem));
+ return result;
+}
+
+static inline void
+__attribute__ ((unused))
+atomic_add (volatile uint32_t *mem, int val)
+{
+ __asm__ __volatile__ ("lock; addl %1,%0"
+ : "=m" (*mem) : "ir" (val), "0" (*mem));
+}
+
+static inline char
+__attribute__ ((unused))
+compare_and_swap (volatile long int *p, long int oldval, long int newval)
+{
+ char ret;
+ long int readval;
+
+ __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
+ : "=q" (ret), "=m" (*p), "=a" (readval)
+ : "r" (newval), "1" (*p), "a" (oldval));
+ return ret;
+}
+
+#endif /* atomicity.h */