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Extend <stdatomic.h> to support GCC 4.7's __atomic.

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The development version of GCC also supports an atomics interface
similar to Clang's. Change the header file to work as follows:

- __CLANG_ATOMICS: Use Clang's new atomics interface,
- __GNUC_ATOMICS: Use GCC's new atomics interface,
- else: fall back to GCC's __sync interface.
This commit is contained in:
Ed Schouten 2011-12-30 01:37:25 +00:00
parent f76b319989
commit 092c20cb19
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=228977
1 changed files with 43 additions and 9 deletions
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52
include/stdatomic.h
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@ -35,13 +35,13 @@
#if __has_feature(cxx_atomic)
#define __CLANG_ATOMICS
#elif defined(__GNUC__)
#elif __GNUC_PREREQ__(4, 7)
#define __GNUC_ATOMICS
#else
#elif !defined(__GNUC__)
#error "stdatomic.h does not support your compiler"
#endif
#ifdef __GNUC_ATOMICS
#if !defined(__CLANG_ATOMICS)
#define _Atomic(T) struct { volatile T __val; }
#endif
@ -52,7 +52,7 @@
#if defined(__CLANG_ATOMICS)
#define ATOMIC_VAR_INIT(value) (value)
#define atomic_init(obj, value) __atomic_init(obj, value)
#elif defined(__GNUC_ATOMICS)
#else
#define ATOMIC_VAR_INIT(value) { .__val = (value) }
#define atomic_init(obj, value) do { \
(obj)->__val = (value); \
@ -106,19 +106,28 @@ enum memory_order {
#if defined(__CLANG_ATOMICS)
#define atomic_thread_fence(order) __atomic_thread_fence(order)
#elif defined(__GNUC_ATOMICS)
#define atomic_thread_fence(order) __sync_synchronize()
#endif
#define atomic_signal_fence(order) __asm volatile ("" : : : "memory");
#elif defined(__GNUC_ATOMICS)
#define atomic_thread_fence(order) __atomic_thread_fence(order)
#define atomic_signal_fence(order) __atomic_signal_fence(order)
#else
#define atomic_thread_fence(order) __sync_synchronize()
#define atomic_signal_fence(order) __asm volatile ("" : : : "memory");
#endif
/*
* 7.17.5 Lock-free property.
*/
#if defined(__CLANG_ATOMICS)
#define atomic_is_lock_free(obj) __atomic_is_lock_free(obj)
#define atomic_is_lock_free(obj) \
__atomic_is_lock_free(obj)
#elif defined(__GNUC_ATOMICS)
#define atomic_is_lock_free(obj) (sizeof((obj)->__val) <= sizeof(void *))
#define atomic_is_lock_free(obj) \
__atomic_is_lock_free(sizeof((obj)->__val))
#else
#define atomic_is_lock_free(obj) \
(sizeof((obj)->__val) <= sizeof(void *))
#endif
/*
@ -199,6 +208,31 @@ typedef _Atomic(__uintmax_t) atomic_uintmax_t;
#define atomic_store_explicit(object, desired, order) \
__atomic_store(object, desired, order)
#elif defined(__GNUC_ATOMICS)
#define atomic_compare_exchange_strong_explicit(object, expected, \
desired, success, failure) \
__atomic_compare_exchange_n(&(object)->__val, expected, \
desired, 0, success, failure)
#define atomic_compare_exchange_weak_explicit(object, expected, \
desired, success, failure) \
__atomic_compare_exchange_n(&(object)->__val, expected, \
desired, 1, success, failure)
#define atomic_exchange_explicit(object, desired, order) \
__atomic_exchange_n(&(object)->__val, desired, order)
#define atomic_fetch_add_explicit(object, operand, order) \
__atomic_fetch_add(&(object)->__val, operand, order)
#define atomic_fetch_and_explicit(object, operand, order) \
__atomic_fetch_and(&(object)->__val, operand, order)
#define atomic_fetch_or_explicit(object, operand, order) \
__atomic_fetch_or(&(object)->__val, operand, order)
#define atomic_fetch_sub_explicit(object, operand, order) \
__atomic_fetch_sub(&(object)->__val, operand, order)
#define atomic_fetch_xor_explicit(object, operand, order) \
__atomic_fetch_xor(&(object)->__val, operand, order)
#define atomic_load_explicit(object, order) \
__atomic_load_n(&(object)->__val, order)
#define atomic_store_explicit(object, desired, order) \
__atomic_store_n(&(object)->__val, desired, order)
#else
#define atomic_compare_exchange_strong_explicit(object, expected, \
desired, success, failure) ({ \
__typeof__((object)->__val) __v; \