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-rw-r--r--include/atomic.h139
1 files changed, 139 insertions, 0 deletions
diff --git a/include/atomic.h b/include/atomic.h
index bd2e2f13f7..340c6e6bfb 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -21,6 +21,26 @@
#ifndef _ATOMIC_H
#define _ATOMIC_H 1
+/* This header defines three types of macros:
+
+ - atomic arithmetic and logic operation on memory. They all
+ have the prefix "atomic_".
+
+ - conditionally atomic operations of the same kinds. These
+ always behave identical but can be faster when atomicity
+ is not really needed since only one thread has access to
+ the memory location. In that case the code is slower in
+ the multi-thread case. The interfaces have the prefix
+ "catomic_".
+
+ - support functions like barriers. They also have the preifx
+ "atomic_".
+
+ Architectures must provide a few lowlevel macros (the compare
+ and exchange definitions). All others are optional. They
+ should only be provided if the architecture has specific
+ support for the operation. */
+
#include <stdlib.h>
#include <bits/atomic.h>
@@ -70,12 +90,29 @@
#endif
+#if !defined catomic_compare_and_exchange_val_acq \
+ && defined __arch_c_compare_and_exchange_val_32_acq
+# define catomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+ __atomic_val_bysize (__arch_c_compare_and_exchange_val,acq, \
+ mem, newval, oldval)
+#else
+# define catomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+ atomic_compare_and_exchange_val_acq (mem, newval, oldval)
+#endif
+
+
#ifndef atomic_compare_and_exchange_val_rel
# define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
atomic_compare_and_exchange_val_acq (mem, newval, oldval)
#endif
+#ifndef catomic_compare_and_exchange_val_rel
+# define catomic_compare_and_exchange_val_rel(mem, newval, oldval) \
+ atomic_compare_and_exchange_val_acq (mem, newval, oldval)
+#endif
+
+
/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
Return zero if *MEM was changed or non-zero if no exchange happened. */
#ifndef atomic_compare_and_exchange_bool_acq
@@ -94,12 +131,34 @@
#endif
+#ifndef catomic_compare_and_exchange_bool_acq
+# ifdef __arch_c_compare_and_exchange_bool_32_acq
+# define catomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+ __atomic_bool_bysize (__arch_c_compare_and_exchange_bool,acq, \
+ mem, newval, oldval)
+# else
+# define catomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+ ({ /* Cannot use __oldval here, because macros later in this file might \
+ call this macro with __oldval argument. */ \
+ __typeof (oldval) __old = (oldval); \
+ catomic_compare_and_exchange_val_acq (mem, newval, __old) != __old; \
+ })
+# endif
+#endif
+
+
#ifndef atomic_compare_and_exchange_bool_rel
# define atomic_compare_and_exchange_bool_rel(mem, newval, oldval) \
atomic_compare_and_exchange_bool_acq (mem, newval, oldval)
#endif
+#ifndef catomic_compare_and_exchange_bool_rel
+# define catomic_compare_and_exchange_bool_rel(mem, newval, oldval) \
+ catomic_compare_and_exchange_bool_acq (mem, newval, oldval)
+#endif
+
+
/* Store NEWVALUE in *MEM and return the old value. */
#ifndef atomic_exchange_acq
# define atomic_exchange_acq(mem, newvalue) \
@@ -141,6 +200,23 @@
#endif
+#ifndef catomic_exchange_and_add
+# define catomic_exchange_and_add(mem, value) \
+ ({ __typeof (*(mem)) __oldv; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __value = (value); \
+ \
+ do \
+ __oldv = *__memp; \
+ while (__builtin_expect (catomic_compare_and_exchange_bool_acq (__memp, \
+ __oldv \
+ + __value,\
+ __oldv), \
+ 0)); \
+ \
+ __oldv; })
+#endif
+
#ifndef atomic_max
# define atomic_max(mem, value) \
@@ -159,6 +235,25 @@
} while (0)
#endif
+
+#ifndef catomic_max
+# define catomic_max(mem, value) \
+ do { \
+ __typeof (*(mem)) __oldv; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __value = (value); \
+ do { \
+ __oldv = *__memp; \
+ if (__oldv >= __value) \
+ break; \
+ } while (__builtin_expect (catomic_compare_and_exchange_bool_acq (__memp, \
+ __value,\
+ __oldv),\
+ 0)); \
+ } while (0)
+#endif
+
+
#ifndef atomic_min
# define atomic_min(mem, value) \
do { \
@@ -176,21 +271,38 @@
} while (0)
#endif
+
#ifndef atomic_add
# define atomic_add(mem, value) (void) atomic_exchange_and_add ((mem), (value))
#endif
+#ifndef catomic_add
+# define catomic_add(mem, value) \
+ (void) catomic_exchange_and_add ((mem), (value))
+#endif
+
+
#ifndef atomic_increment
# define atomic_increment(mem) atomic_add ((mem), 1)
#endif
+#ifndef catomic_increment
+# define catomic_increment(mem) catomic_add ((mem), 1)
+#endif
+
+
#ifndef atomic_increment_val
# define atomic_increment_val(mem) (atomic_exchange_and_add ((mem), 1) + 1)
#endif
+#ifndef catomic_increment_val
+# define catomic_increment_val(mem) (catomic_exchange_and_add ((mem), 1) + 1)
+#endif
+
+
/* Add one to *MEM and return true iff it's now zero. */
#ifndef atomic_increment_and_test
# define atomic_increment_and_test(mem) \
@@ -203,11 +315,21 @@
#endif
+#ifndef catomic_decrement
+# define catomic_decrement(mem) catomic_add ((mem), -1)
+#endif
+
+
#ifndef atomic_decrement_val
# define atomic_decrement_val(mem) (atomic_exchange_and_add ((mem), -1) - 1)
#endif
+#ifndef catomic_decrement_val
+# define catomic_decrement_val(mem) (catomic_exchange_and_add ((mem), -1) - 1)
+#endif
+
+
/* Subtract 1 from *MEM and return true iff it's now zero. */
#ifndef atomic_decrement_and_test
# define atomic_decrement_and_test(mem) \
@@ -327,6 +449,23 @@
} while (0)
#endif
+#ifndef catomic_or
+# define catomic_or(mem, mask) \
+ do { \
+ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __mask = (mask); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (catomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ | __mask, \
+ __oldval),\
+ 0)); \
+ } while (0)
+#endif
+
/* Atomically *mem |= mask and return the old value of *mem. */
#ifndef atomic_or_val
# define atomic_or_val(mem, mask) \