+#ifndef _URCU_UATOMIC_GENERIC_H
+#define _URCU_UATOMIC_GENERIC_H
+
+/*
+ * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
+ * Copyright (c) 2009 Mathieu Desnoyers
+ * Copyright (c) 2010 Paolo Bonzini
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ *
+ * Code inspired from libuatomic_ops-1.2, inherited in part from the
+ * Boehm-Demers-Weiser conservative garbage collector.
+ */
+
+#include <urcu/compiler.h>
+#include <urcu/system.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef BITS_PER_LONG
+#define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
+#endif
+
+#ifndef uatomic_set
+#define uatomic_set(addr, v) STORE_SHARED(*(addr), (v))
+#endif
+
+#ifndef uatomic_read
+#define uatomic_read(addr) LOAD_SHARED(*(addr))
+#endif
+
+#if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR
+static inline __attribute__((always_inline))
+void _uatomic_link_error()
+{
+#ifdef ILLEGAL_INSTR
+ /* generate an illegal instruction. Cannot catch this with linker tricks
+ * when optimizations are disabled. */
+ __asm__ __volatile__(ILLEGAL_INSTR);
+#else
+ __builtin_trap ();
+#endif
+}
+
+#else /* #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */
+extern void _uatomic_link_error ();
+#endif /* #else #if !defined __OPTIMIZE__ || defined UATOMIC_NO_LINK_ERROR */
+
+/* cmpxchg */
+
+#ifndef uatomic_cmpxchg
+static inline __attribute__((always_inline))
+unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
+ unsigned long _new, int len)
+{
+ switch (len) {
+ case 4:
+ return __sync_val_compare_and_swap_4(addr, old, _new);
+#if (BITS_PER_LONG == 64)
+ case 8:
+ return __sync_val_compare_and_swap_8(addr, old, _new);
+#endif
+ }
+ _uatomic_link_error();
+ return 0;
+}
+
+
+#define uatomic_cmpxchg(addr, old, _new) \
+ ((__typeof__(*(addr))) _uatomic_cmpxchg((addr), (unsigned long)(old),\
+ (unsigned long)(_new), \
+ sizeof(*(addr))))
+
+
+/* uatomic_add_return */
+
+#ifndef uatomic_add_return
+static inline __attribute__((always_inline))
+unsigned long _uatomic_add_return(void *addr, unsigned long val,
+ int len)
+{
+ switch (len) {
+ case 4:
+ return __sync_add_and_fetch_4(addr, val);
+#if (BITS_PER_LONG == 64)
+ case 8:
+ return __sync_add_and_fetch_8(addr, val);
+#endif
+ }
+ _uatomic_link_error();
+ return 0;
+}
+
+
+#define uatomic_add_return(addr, v) \
+ ((__typeof__(*(addr))) _uatomic_add_return((addr), \
+ (unsigned long)(v), \
+ sizeof(*(addr))))
+#endif /* #ifndef uatomic_add_return */
+
+#ifndef uatomic_xchg
+/* xchg */
+
+static inline __attribute__((always_inline))
+unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
+{
+ switch (len) {
+ case 4:
+ {
+ unsigned int old;
+
+ do {
+ old = uatomic_read((unsigned int *)addr);
+ while (!__sync_bool_compare_and_swap_4(addr, old, val));
+
+ } return old;
+ }
+#if (BITS_PER_LONG == 64)
+ case 8:
+ {
+ unsigned long old;
+
+ do {
+ old = uatomic_read((unsigned long *)addr);
+ } while (!__sync_bool_compare_and_swap_8(addr, old, val));
+
+ return old;
+ }
+#endif
+ }
+ _uatomic_link_error();
+ return 0;
+}
+
+#define uatomic_xchg(addr, v) \
+ ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
+ sizeof(*(addr))))
+#endif /* #ifndef uatomic_xchg */
+
+#else /* #ifndef uatomic_cmpxchg */
+
+#ifndef uatomic_add_return
+/* uatomic_add_return */
+
+static inline __attribute__((always_inline))
+unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
+{
+ switch (len) {
+ case 4:
+ {
+ unsigned int old, oldt;
+
+ oldt = uatomic_read((unsigned int *)addr);
+ do {
+ old = oldt;
+ oldt = _uatomic_cmpxchg(addr, old, old + val, 4);
+ } while (oldt != old);
+
+ return old + val;
+ }
+#if (BITS_PER_LONG == 64)
+ case 8:
+ {
+ unsigned long old, oldt;
+
+ oldt = uatomic_read((unsigned long *)addr);
+ do {
+ old = oldt;
+ oldt = _uatomic_cmpxchg(addr, old, old + val, 8);
+ } while (oldt != old);
+
+ return old + val;
+ }
+#endif
+ }
+ _uatomic_link_error();
+ return 0;
+}
+
+#define uatomic_add_return(addr, v) \
+ ((__typeof__(*(addr))) _uatomic_add_return((addr), \
+ (unsigned long)(v), \
+ sizeof(*(addr))))
+#endif /* #ifndef uatomic_add_return */
+
+#ifndef uatomic_xchg
+/* xchg */
+
+static inline __attribute__((always_inline))
+unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
+{
+ switch (len) {
+ case 4:
+ {
+ unsigned int old, oldt;
+
+ oldt = uatomic_read((unsigned int *)addr);
+ do {
+ old = oldt;
+ oldt = _uatomic_cmpxchg(addr, old, val, 4);
+ } while (oldt != old);
+
+ return old;
+ }
+#if (BITS_PER_LONG == 64)
+ case 8:
+ {
+ unsigned long old, oldt;
+
+ oldt = uatomic_read((unsigned long *)addr);
+ do {
+ old = oldt;
+ oldt = _uatomic_cmpxchg(addr, old, val, 8);
+ } while (oldt != old);
+
+ return old;
+ }
+#endif
+ }
+ _uatomic_link_error();
+ return 0;
+}
+
+#define uatomic_xchg(addr, v) \
+ ((__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
+ sizeof(*(addr))))
+#endif /* #ifndef uatomic_xchg */
+
+#endif /* #else #ifndef uatomic_cmpxchg */
+
+/* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */
+
+#ifndef uatomic_add
+#define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v))
+#endif
+
+#define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v))
+#define uatomic_sub(addr, v) uatomic_add((addr), -(v))
+
+#ifndef uatomic_inc
+#define uatomic_inc(addr) uatomic_add((addr), 1)
+#endif
+
+#ifndef uatomic_dec
+#define uatomic_dec(addr) uatomic_add((addr), -1)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URCU_UATOMIC_GENERIC_H */
projects / urcu.git / commitdiff
