diff options
Diffstat (limited to 'include/atomic.h')
| -rw-r--r-- | include/atomic.h | 365 |
1 files changed, 96 insertions, 269 deletions
diff --git a/include/atomic.h b/include/atomic.h index 2ad8b5fcb7..d44728b215 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -21,31 +21,6 @@ #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. - - As <atomic.h> macros are usually heavily nested and often use local - variables to make sure side-effects are evaluated properly, use for - macro local variables a per-macro unique prefix. This file uses - __atgN_ prefix where N is different in each macro. */ - #include <stdlib.h> #include <bits/atomic.h> @@ -55,33 +30,33 @@ and following args. */ #define __atomic_val_bysize(pre, post, mem, ...) \ ({ \ - __typeof (*mem) __atg1_result; \ + __typeof (*mem) __result; \ if (sizeof (*mem) == 1) \ - __atg1_result = pre##_8_##post (mem, __VA_ARGS__); \ + __result = pre##_8_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 2) \ - __atg1_result = pre##_16_##post (mem, __VA_ARGS__); \ + __result = pre##_16_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 4) \ - __atg1_result = pre##_32_##post (mem, __VA_ARGS__); \ + __result = pre##_32_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 8) \ - __atg1_result = pre##_64_##post (mem, __VA_ARGS__); \ + __result = pre##_64_##post (mem, __VA_ARGS__); \ else \ abort (); \ - __atg1_result; \ + __result; \ }) #define __atomic_bool_bysize(pre, post, mem, ...) \ ({ \ - int __atg2_result; \ + int __result; \ if (sizeof (*mem) == 1) \ - __atg2_result = pre##_8_##post (mem, __VA_ARGS__); \ + __result = pre##_8_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 2) \ - __atg2_result = pre##_16_##post (mem, __VA_ARGS__); \ + __result = pre##_16_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 4) \ - __atg2_result = pre##_32_##post (mem, __VA_ARGS__); \ + __result = pre##_32_##post (mem, __VA_ARGS__); \ else if (sizeof (*mem) == 8) \ - __atg2_result = pre##_64_##post (mem, __VA_ARGS__); \ + __result = pre##_64_##post (mem, __VA_ARGS__); \ else \ abort (); \ - __atg2_result; \ + __result; \ }) @@ -95,29 +70,12 @@ #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 @@ -129,26 +87,8 @@ # define atomic_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) __atg3_old = (oldval); \ - atomic_compare_and_exchange_val_acq (mem, newval, __atg3_old) \ - != __atg3_old; \ - }) -# endif -#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) __atg4_old = (oldval); \ - catomic_compare_and_exchange_val_acq (mem, newval, __atg4_old) \ - != __atg4_old; \ + __typeof (oldval) __old = (oldval); \ + atomic_compare_and_exchange_val_acq (mem, newval, __old) != __old; \ }) # endif #endif @@ -160,26 +100,21 @@ #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) \ - ({ __typeof (*(mem)) __atg5_oldval; \ - __typeof (mem) __atg5_memp = (mem); \ - __typeof (*(mem)) __atg5_value = (newvalue); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __value = (newvalue); \ \ do \ - __atg5_oldval = *__atg5_memp; \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg5_memp, __atg5_value, \ - __atg5_oldval), 0)); \ + __oldval = *__memp; \ + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __value, \ + __oldval),\ + 0)); \ \ - __atg5_oldval; }) + __oldval; }) #endif #ifndef atomic_exchange_rel @@ -190,124 +125,72 @@ /* Add VALUE to *MEM and return the old value of *MEM. */ #ifndef atomic_exchange_and_add # define atomic_exchange_and_add(mem, value) \ - ({ __typeof (*(mem)) __atg6_oldval; \ - __typeof (mem) __atg6_memp = (mem); \ - __typeof (*(mem)) __atg6_value = (value); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __value = (value); \ \ do \ - __atg6_oldval = *__atg6_memp; \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg6_memp, \ - __atg6_oldval \ - + __atg6_value, \ - __atg6_oldval), 0)); \ + __oldval = *__memp; \ + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __oldval \ + + __value,\ + __oldval),\ + 0)); \ \ - __atg6_oldval; }) + __oldval; }) #endif -#ifndef catomic_exchange_and_add -# define catomic_exchange_and_add(mem, value) \ - ({ __typeof (*(mem)) __atg7_oldv; \ - __typeof (mem) __atg7_memp = (mem); \ - __typeof (*(mem)) __atg7_value = (value); \ - \ - do \ - __atg7_oldv = *__atg7_memp; \ - while (__builtin_expect \ - (catomic_compare_and_exchange_bool_acq (__atg7_memp, \ - __atg7_oldv \ - + __atg7_value, \ - __atg7_oldv), 0)); \ - \ - __atg7_oldv; }) -#endif - #ifndef atomic_max # define atomic_max(mem, value) \ do { \ - __typeof (*(mem)) __atg8_oldval; \ - __typeof (mem) __atg8_memp = (mem); \ - __typeof (*(mem)) __atg8_value = (value); \ - do { \ - __atg8_oldval = *__atg8_memp; \ - if (__atg8_oldval >= __atg8_value) \ - break; \ - } while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg8_memp, __atg8_value,\ - __atg8_oldval), 0)); \ - } while (0) -#endif - - -#ifndef catomic_max -# define catomic_max(mem, value) \ - do { \ - __typeof (*(mem)) __atg9_oldv; \ - __typeof (mem) __atg9_memp = (mem); \ - __typeof (*(mem)) __atg9_value = (value); \ + __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __value = (value); \ do { \ - __atg9_oldv = *__atg9_memp; \ - if (__atg9_oldv >= __atg9_value) \ + __oldval = *__memp; \ + if (__oldval >= __value) \ break; \ - } while (__builtin_expect \ - (catomic_compare_and_exchange_bool_acq (__atg9_memp, \ - __atg9_value, \ - __atg9_oldv), 0)); \ + } while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __value, \ + __oldval),\ + 0)); \ } while (0) #endif - #ifndef atomic_min # define atomic_min(mem, value) \ do { \ - __typeof (*(mem)) __atg10_oldval; \ - __typeof (mem) __atg10_memp = (mem); \ - __typeof (*(mem)) __atg10_value = (value); \ + __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __value = (value); \ do { \ - __atg10_oldval = *__atg10_memp; \ - if (__atg10_oldval <= __atg10_value) \ + __oldval = *__memp; \ + if (__oldval <= __value) \ break; \ - } while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg10_memp, \ - __atg10_value, \ - __atg10_oldval), 0)); \ + } while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __value, \ + __oldval),\ + 0)); \ } 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) \ @@ -320,21 +203,11 @@ #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) \ @@ -345,34 +218,35 @@ /* Decrement *MEM if it is > 0, and return the old value. */ #ifndef atomic_decrement_if_positive # define atomic_decrement_if_positive(mem) \ - ({ __typeof (*(mem)) __atg11_oldval; \ - __typeof (mem) __atg11_memp = (mem); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ \ do \ { \ - __atg11_oldval = *__atg11_memp; \ - if (__builtin_expect (__atg11_oldval <= 0, 0)) \ + __oldval = *__memp; \ + if (__builtin_expect (__oldval <= 0, 0)) \ break; \ } \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg11_memp, \ - __atg11_oldval - 1, \ - __atg11_oldval), 0)); \ - __atg11_oldval; }) + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __oldval \ + - 1, \ + __oldval),\ + 0));\ + __oldval; }) #endif #ifndef atomic_add_negative # define atomic_add_negative(mem, value) \ - ({ __typeof (value) __atg12_value = (value); \ - atomic_exchange_and_add (mem, __atg12_value) < -__atg12_value; }) + ({ __typeof (value) __aan_value = (value); \ + atomic_exchange_and_add (mem, __aan_value) < -__aan_value; }) #endif #ifndef atomic_add_zero # define atomic_add_zero(mem, value) \ - ({ __typeof (value) __atg13_value = (value); \ - atomic_exchange_and_add (mem, __atg13_value) == -__atg13_value; }) + ({ __typeof (value) __aaz_value = (value); \ + atomic_exchange_and_add (mem, __aaz_value) == -__aaz_value; }) #endif @@ -384,102 +258,55 @@ #ifndef atomic_bit_test_set # define atomic_bit_test_set(mem, bit) \ - ({ __typeof (*(mem)) __atg14_old; \ - __typeof (mem) __atg14_memp = (mem); \ - __typeof (*(mem)) __atg14_mask = ((__typeof (*(mem))) 1 << (bit)); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __mask = ((__typeof (*(mem))) 1 << (bit)); \ \ do \ - __atg14_old = (*__atg14_memp); \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg14_memp, \ - __atg14_old | __atg14_mask,\ - __atg14_old), 0)); \ + __oldval = (*__memp); \ + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __oldval \ + | __mask, \ + __oldval),\ + 0)); \ \ - __atg14_old & __atg14_mask; }) + __oldval & __mask; }) #endif -/* Atomically *mem &= mask. */ +/* Atomically *mem &= mask and return the old value of *mem. */ #ifndef atomic_and # define atomic_and(mem, mask) \ - do { \ - __typeof (*(mem)) __atg15_old; \ - __typeof (mem) __atg15_memp = (mem); \ - __typeof (*(mem)) __atg15_mask = (mask); \ - \ - do \ - __atg15_old = (*__atg15_memp); \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg15_memp, \ - __atg15_old & __atg15_mask, \ - __atg15_old), 0)); \ - } while (0) -#endif - -/* Atomically *mem &= mask and return the old value of *mem. */ -#ifndef atomic_and_val -# define atomic_and_val(mem, mask) \ - ({ __typeof (*(mem)) __atg16_old; \ - __typeof (mem) __atg16_memp = (mem); \ - __typeof (*(mem)) __atg16_mask = (mask); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __mask = (mask); \ \ do \ - __atg16_old = (*__atg16_memp); \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg16_memp, \ - __atg16_old & __atg16_mask,\ - __atg16_old), 0)); \ + __oldval = (*__memp); \ + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __oldval \ + & __mask, \ + __oldval),\ + 0)); \ \ - __atg16_old; }) + __oldval; }) #endif /* Atomically *mem |= mask and return the old value of *mem. */ #ifndef atomic_or # define atomic_or(mem, mask) \ - do { \ - __typeof (*(mem)) __atg17_old; \ - __typeof (mem) __atg17_memp = (mem); \ - __typeof (*(mem)) __atg17_mask = (mask); \ - \ - do \ - __atg17_old = (*__atg17_memp); \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg17_memp, \ - __atg17_old | __atg17_mask, \ - __atg17_old), 0)); \ - } while (0) -#endif - -#ifndef catomic_or -# define catomic_or(mem, mask) \ - do { \ - __typeof (*(mem)) __atg18_old; \ - __typeof (mem) __atg18_memp = (mem); \ - __typeof (*(mem)) __atg18_mask = (mask); \ - \ - do \ - __atg18_old = (*__atg18_memp); \ - while (__builtin_expect \ - (catomic_compare_and_exchange_bool_acq (__atg18_memp, \ - __atg18_old | __atg18_mask,\ - __atg18_old), 0)); \ - } while (0) -#endif - -/* Atomically *mem |= mask and return the old value of *mem. */ -#ifndef atomic_or_val -# define atomic_or_val(mem, mask) \ - ({ __typeof (*(mem)) __atg19_old; \ - __typeof (mem) __atg19_memp = (mem); \ - __typeof (*(mem)) __atg19_mask = (mask); \ + ({ __typeof (*(mem)) __oldval; \ + __typeof (mem) __memp = (mem); \ + __typeof (*(mem)) __mask = (mask); \ \ do \ - __atg19_old = (*__atg19_memp); \ - while (__builtin_expect \ - (atomic_compare_and_exchange_bool_acq (__atg19_memp, \ - __atg19_old | __atg19_mask,\ - __atg19_old), 0)); \ + __oldval = (*__memp); \ + while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \ + __oldval \ + | __mask, \ + __oldval),\ + 0)); \ \ - __atg19_old; }) + __oldval; }) #endif #ifndef atomic_full_barrier |