atomic_sync.c
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/*
* Copyright (C) 2015-2016 Eistec AB
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup core_util
* @{
*
* @file
*
* @brief Implementation of __sync atomic operations for GCC versions prior to v4.7
*
* @see https://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary
* @see https://gcc.gnu.org/onlinedocs/gcc/_005f_005fsync-Builtins.html
* @see https://gcc.gnu.org/onlinedocs/gcc-4.6.4/gcc/Atomic-Builtins.html
*
* @author Joakim Nohlgård <joakim.nohlgard@eistec.se>
*/
#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdatomic.h>
#include <string.h>
#include "irq.h"
#if !defined(__llvm__) && !defined(__clang__)
/* GCC documentation refers to the types as I1, I2, I4, I8, I16 */
typedef uint8_t I1;
typedef uint16_t I2;
typedef uint32_t I4;
typedef uint64_t I8;
/* typedef __uint128_t I16; */ /* No 128 bit integer support yet */
/**
* @brief This is a macro that defines a function named __sync_lock_test_and_set_<em>n</em>
*
* This is an exchange operation, not a compare and swap
*
* @param[in] n width of the data, in bytes
*/
#define TEMPLATE_SYNC_LOCK_TEST_AND_SET_N(n) \
I##n __sync_lock_test_and_set_##n (I##n *ptr, I##n desired) \
{ \
unsigned int mask = irq_disable(); \
I##n old = *ptr; \
*ptr = desired; \
irq_restore(mask); \
return old; \
}
/**
* @brief This is a macro that defines a function named __sync_lock_release_<em>n</em>
*
* This will write 0 to @p *ptr
*
* @param[in] n width of the data, in bytes
*/
#define TEMPLATE_SYNC_LOCK_RELEASE_N(n) \
void __sync_lock_release_##n (I##n *ptr) \
{ \
unsigned int mask = irq_disable(); \
*ptr = 0; \
irq_restore(mask); \
}
/**
* @brief This is a macro that defines a function named __sync_bool_compare_and_swap_<em>n</em>
*
* @param[in] n width of the data, in bytes
*/
#define TEMPLATE_SYNC_BOOL_COMPARE_AND_SWAP_N(n) \
bool __sync_bool_compare_and_swap_##n (I##n *ptr, I##n expected, I##n desired) \
{ \
unsigned int mask = irq_disable(); \
I##n cur = *ptr; \
if (cur != expected) { \
irq_restore(mask); \
return false; \
} \
\
*ptr = desired; \
irq_restore(mask); \
return true; \
}
/**
* @brief This is a macro that defines a function named __sync_val_compare_and_swap_<em>n</em>
*
* @param[in] n width of the data, in bytes
*/
#define TEMPLATE_SYNC_VAL_COMPARE_AND_SWAP_N(n) \
I##n __sync_val_compare_and_swap_##n (I##n *ptr, I##n expected, I##n desired) \
{ \
unsigned int mask = irq_disable(); \
I##n cur = *ptr; \
if (cur == expected) { \
*ptr = desired; \
} \
\
irq_restore(mask); \
return cur; \
}
/**
* @brief This is a macro that defines a function named __sync_fetch_and_<em>opname</em>_<em>n</em>
*
* @param[in] opname operator name that will be used in the function name
* @param[in] op actual C language operator
* @param[in] n width of the data, in bytes
* @param[in] prefixop optional prefix unary operator (use ~ for inverting, NAND, NOR etc)
*/
#define TEMPLATE_SYNC_FETCH_AND_OP_N(opname, op, n, prefixop) \
I##n __sync_fetch_and_##opname##_##n(I##n *ptr, I##n val) \
{ \
unsigned int mask = irq_disable(); \
I##n tmp = *ptr; \
*ptr = prefixop(tmp op val); \
irq_restore(mask); \
return tmp; \
}
/**
* @brief This is a macro that defines a function named __sync_<em>opname</em>_and_fetch_<em>n</em>
*
* @param[in] opname operator name that will be used in the function name
* @param[in] op actual C language operator
* @param[in] n width of the data, in bytes
* @param[in] prefixop optional prefix unary operator (use ~ for inverting, NAND, NOR etc)
*/
#define TEMPLATE_SYNC_OP_AND_FETCH_N(opname, op, n, prefixop) \
I##n __sync_##opname##_and_fetch_##n(I##n *ptr, I##n val) \
{ \
unsigned int mask = irq_disable(); \
I##n tmp = prefixop((*ptr) op val); \
*ptr = tmp; \
irq_restore(mask); \
return tmp; \
}
/* Template instantiations below */
TEMPLATE_SYNC_LOCK_TEST_AND_SET_N(1) /* __sync_lock_test_and_set_1 */
TEMPLATE_SYNC_LOCK_TEST_AND_SET_N(2) /* __sync_lock_test_and_set_2 */
TEMPLATE_SYNC_LOCK_TEST_AND_SET_N(4) /* __sync_lock_test_and_set_4 */
TEMPLATE_SYNC_LOCK_TEST_AND_SET_N(8) /* __sync_lock_test_and_set_8 */
TEMPLATE_SYNC_LOCK_RELEASE_N(1) /* __sync_lock_release_1 */
TEMPLATE_SYNC_LOCK_RELEASE_N(2) /* __sync_lock_release_2 */
TEMPLATE_SYNC_LOCK_RELEASE_N(4) /* __sync_lock_release_4 */
TEMPLATE_SYNC_LOCK_RELEASE_N(8) /* __sync_lock_release_8 */
TEMPLATE_SYNC_BOOL_COMPARE_AND_SWAP_N(1) /* __sync_bool_compare_and_swap_1 */
TEMPLATE_SYNC_BOOL_COMPARE_AND_SWAP_N(2) /* __sync_bool_compare_and_swap_2 */
TEMPLATE_SYNC_BOOL_COMPARE_AND_SWAP_N(4) /* __sync_bool_compare_and_swap_4 */
TEMPLATE_SYNC_BOOL_COMPARE_AND_SWAP_N(8) /* __sync_bool_compare_and_swap_8 */
TEMPLATE_SYNC_VAL_COMPARE_AND_SWAP_N(1) /* __sync_val_compare_and_swap_1 */
TEMPLATE_SYNC_VAL_COMPARE_AND_SWAP_N(2) /* __sync_val_compare_and_swap_2 */
TEMPLATE_SYNC_VAL_COMPARE_AND_SWAP_N(4) /* __sync_val_compare_and_swap_4 */
TEMPLATE_SYNC_VAL_COMPARE_AND_SWAP_N(8) /* __sync_val_compare_and_swap_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N( add, +, 1, ) /* __sync_fetch_and_add_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N( add, +, 2, ) /* __sync_fetch_and_add_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N( add, +, 4, ) /* __sync_fetch_and_add_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N( add, +, 8, ) /* __sync_fetch_and_add_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N( sub, -, 1, ) /* __sync_fetch_and_sub_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N( sub, -, 2, ) /* __sync_fetch_and_sub_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N( sub, -, 4, ) /* __sync_fetch_and_sub_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N( sub, -, 8, ) /* __sync_fetch_and_sub_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N( and, &, 1, ) /* __sync_fetch_and_and_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N( and, &, 2, ) /* __sync_fetch_and_and_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N( and, &, 4, ) /* __sync_fetch_and_and_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N( and, &, 8, ) /* __sync_fetch_and_and_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N( or, |, 1, ) /* __sync_fetch_and_or_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N( or, |, 2, ) /* __sync_fetch_and_or_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N( or, |, 4, ) /* __sync_fetch_and_or_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N( or, |, 8, ) /* __sync_fetch_and_or_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N( xor, ^, 1, ) /* __sync_fetch_and_xor_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N( xor, ^, 2, ) /* __sync_fetch_and_xor_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N( xor, ^, 4, ) /* __sync_fetch_and_xor_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N( xor, ^, 8, ) /* __sync_fetch_and_xor_8 */
TEMPLATE_SYNC_FETCH_AND_OP_N(nand, &, 1, ~) /* __sync_fetch_and_nand_1 */
TEMPLATE_SYNC_FETCH_AND_OP_N(nand, &, 2, ~) /* __sync_fetch_and_nand_2 */
TEMPLATE_SYNC_FETCH_AND_OP_N(nand, &, 4, ~) /* __sync_fetch_and_nand_4 */
TEMPLATE_SYNC_FETCH_AND_OP_N(nand, &, 8, ~) /* __sync_fetch_and_nand_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N( add, +, 1, ) /* __sync_add_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N( add, +, 2, ) /* __sync_add_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N( add, +, 4, ) /* __sync_add_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N( add, +, 8, ) /* __sync_add_and_fetch_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N( sub, -, 1, ) /* __sync_sub_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N( sub, -, 2, ) /* __sync_sub_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N( sub, -, 4, ) /* __sync_sub_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N( sub, -, 8, ) /* __sync_sub_and_fetch_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N( and, &, 1, ) /* __sync_and_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N( and, &, 2, ) /* __sync_and_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N( and, &, 4, ) /* __sync_and_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N( and, &, 8, ) /* __sync_and_and_fetch_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N( or, |, 1, ) /* __sync_or_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N( or, |, 2, ) /* __sync_or_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N( or, |, 4, ) /* __sync_or_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N( or, |, 8, ) /* __sync_or_and_fetch_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N( xor, ^, 1, ) /* __sync_xor_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N( xor, ^, 2, ) /* __sync_xor_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N( xor, ^, 4, ) /* __sync_xor_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N( xor, ^, 8, ) /* __sync_xor_and_fetch_8 */
TEMPLATE_SYNC_OP_AND_FETCH_N(nand, &, 1, ~) /* __sync_nand_and_fetch_1 */
TEMPLATE_SYNC_OP_AND_FETCH_N(nand, &, 2, ~) /* __sync_nand_and_fetch_2 */
TEMPLATE_SYNC_OP_AND_FETCH_N(nand, &, 4, ~) /* __sync_nand_and_fetch_4 */
TEMPLATE_SYNC_OP_AND_FETCH_N(nand, &, 8, ~) /* __sync_nand_and_fetch_8 */
#endif
/** @} */