#ifndef COSMOPOLITAN_LIBC_BITS_ATOMIC_H_
#define COSMOPOLITAN_LIBC_BITS_ATOMIC_H_
#include "libc/atomic.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* @fileoverview Cosmopolitan C11 Atomics Library
*
* - Forty-two different ways to say MOV.
* - Fourteen different ways to say XCHG.
* - Twenty different ways to say LOCK CMPXCHG.
*
* @see libc/atomic.h
*/
typedef int memory_order;
enum {
memory_order_relaxed,
memory_order_consume,
memory_order_acquire,
memory_order_release,
memory_order_acq_rel,
memory_order_seq_cst,
};
#define ATOMIC_VAR_INIT(...) __VA_ARGS__
#define atomic_is_lock_free(obj) ((void)(obj), sizeof(obj) <= sizeof(void *))
#define atomic_flag atomic_bool
#define ATOMIC_FLAG_INIT ATOMIC_VAR_INIT(0)
#define atomic_flag_test_and_set_explicit(x, order) \
atomic_exchange_explicit(x, 1, order)
#define atomic_flag_clear_explicit(x, order) atomic_store_explicit(x, 0, order)
#define atomic_compare_exchange_strong(pObject, pExpected, desired) \
atomic_compare_exchange_strong_explicit( \
pObject, pExpected, desired, memory_order_seq_cst, memory_order_seq_cst)
#define atomic_compare_exchange_weak(pObject, pExpected, desired) \
atomic_compare_exchange_weak_explicit( \
pObject, pExpected, desired, memory_order_seq_cst, memory_order_seq_cst)
#define atomic_exchange(pObject, desired) \
atomic_exchange_explicit(pObject, desired, memory_order_seq_cst)
#define atomic_fetch_add(pObject, operand) \
atomic_fetch_add_explicit(pObject, operand, memory_order_seq_cst)
#define atomic_fetch_and(pObject, operand) \
atomic_fetch_and_explicit(pObject, operand, memory_order_seq_cst)
#define atomic_fetch_or(pObject, operand) \
atomic_fetch_or_explicit(pObject, operand, memory_order_seq_cst)
#define atomic_fetch_sub(pObject, operand) \
atomic_fetch_sub_explicit(pObject, operand, memory_order_seq_cst)
#define atomic_fetch_xor(pObject, operand) \
atomic_fetch_xor_explicit(pObject, operand, memory_order_seq_cst)
#define atomic_load(pObject) atomic_load_explicit(pObject, memory_order_seq_cst)
#define atomic_store(pObject, desired) \
atomic_store_explicit(pObject, desired, memory_order_seq_cst)
#define atomic_flag_test_and_set(x) \
atomic_flag_test_and_set_explicit(x, memory_order_seq_cst)
#define atomic_flag_clear(x) atomic_flag_clear_explicit(x, memory_order_seq_cst)
#if defined(__CLANG_ATOMIC_BOOL_LOCK_FREE)
#define atomic_init(obj, value) __c11_atomic_init(obj, value)
#define atomic_thread_fence(order) __c11_atomic_thread_fence(order)
#define atomic_signal_fence(order) __c11_atomic_signal_fence(order)
#define atomic_compare_exchange_strong_explicit(object, expected, desired, \
success, failure) \
__c11_atomic_compare_exchange_strong(object, expected, desired, success, \
failure)
#define atomic_compare_exchange_weak_explicit(object, expected, desired, \
success, failure) \
__c11_atomic_compare_exchange_weak(object, expected, desired, success, \
failure)
#define atomic_exchange_explicit(object, desired, order) \
__c11_atomic_exchange(object, desired, order)
#define atomic_fetch_add_explicit(object, operand, order) \
__c11_atomic_fetch_add(object, operand, order)
#define atomic_fetch_and_explicit(object, operand, order) \
__c11_atomic_fetch_and(object, operand, order)
#define atomic_fetch_or_explicit(object, operand, order) \
__c11_atomic_fetch_or(object, operand, order)
#define atomic_fetch_sub_explicit(object, operand, order) \
__c11_atomic_fetch_sub(object, operand, order)
#define atomic_fetch_xor_explicit(object, operand, order) \
__c11_atomic_fetch_xor(object, operand, order)
#define atomic_load_explicit(object, order) __c11_atomic_load(object, order)
#define atomic_store_explicit(object, desired, order) \
__c11_atomic_store(object, desired, order)
#elif (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 407
#define atomic_init(obj, value) ((void)(*(obj) = (value)))
#define atomic_thread_fence(order) __atomic_thread_fence(order)
#define atomic_signal_fence(order) __atomic_signal_fence(order)
#define atomic_compare_exchange_strong_explicit(pObject, pExpected, desired, \
success, failure) \
__atomic_compare_exchange_n(pObject, pExpected, desired, 0, success, failure)
#define atomic_compare_exchange_weak_explicit(pObject, pExpected, desired, \
success, failure) \
__atomic_compare_exchange_n(pObject, pExpected, desired, 1, success, failure)
#define atomic_exchange_explicit(pObject, desired, order) \
__atomic_exchange_n(pObject, desired, order)
#define atomic_fetch_add_explicit(pObject, operand, order) \
__atomic_fetch_add(pObject, operand, order)
#define atomic_fetch_and_explicit(pObject, operand, order) \
__atomic_fetch_and(pObject, operand, order)
#define atomic_fetch_or_explicit(pObject, operand, order) \
__atomic_fetch_or(pObject, operand, order)
#define atomic_fetch_sub_explicit(pObject, operand, order) \
__atomic_fetch_sub(pObject, operand, order)
#define atomic_fetch_xor_explicit(pObject, operand, order) \
__atomic_fetch_xor(pObject, operand, order)
#define atomic_load_explicit(pObject, order) __atomic_load_n(pObject, order)
#define atomic_store_explicit(pObject, desired, order) \
__atomic_store_n(pObject, desired, order)
#elif (__GNUC__ + 0) * 100 + (__GNUC_MINOR__ + 0) >= 401
#define atomic_init(obj, value) ((void)(*(obj) = (value)))
#define atomic_thread_fence(order) __sync_synchronize()
#define atomic_signal_fence(order) __asm__ volatile("" ::: "memory")
#define __atomic_apply_stride(object, operand) \
(((__typeof__(*(object)))0) + (operand))
#define atomic_compare_exchange_strong_explicit(object, expected, desired, \
success_order, failure_order) \
__extension__({ \
__typeof__(expected) __ep = (expected); \
__typeof__(*__ep) __e = *__ep; \
(void)(success_order); \
(void)(failure_order); \
(*__ep = __sync_val_compare_and_swap(object, __e, desired)) == __e; \
})
#define atomic_compare_exchange_weak_explicit(object, expected, desired, \
success_order, failure_order) \
atomic_compare_exchange_strong_explicit(object, expected, desired, \
success_order, failure_order)
#if __has_builtin(__sync_swap)
#define atomic_exchange_explicit(object, desired, order) \
((void)(order), __sync_swap(object, desired))
#else
#define atomic_exchange_explicit(object, desired, order) \
__extension__({ \
__typeof__(object) __o = (object); \
__typeof__(desired) __d = (desired); \
(void)(order); \
__sync_synchronize(); \
__sync_lock_test_and_set(__o, __d); \
})
#endif
#define atomic_fetch_add_explicit(object, operand, order) \
((void)(order), \
__sync_fetch_and_add(object, __atomic_apply_stride(object, operand)))
#define atomic_fetch_and_explicit(object, operand, order) \
((void)(order), __sync_fetch_and_and(object, operand))
#define atomic_fetch_or_explicit(object, operand, order) \
((void)(order), __sync_fetch_and_or(object, operand))
#define atomic_fetch_sub_explicit(object, operand, order) \
((void)(order), \
__sync_fetch_and_sub(object, __atomic_apply_stride(object, operand)))
#define atomic_fetch_xor_explicit(object, operand, order) \
((void)(order), __sync_fetch_and_xor(object, operand))
#define atomic_load_explicit(object, order) \
((void)(order), __sync_fetch_and_add(object, 0))
#define atomic_store_explicit(object, desired, order) \
((void)atomic_exchange_explicit(object, desired, order))
#elif defined(__GNUC__) && defined(__x86__) /* x86 with gcc 4.0 and earlier */
#define atomic_init(obj, value) ((void)(*(obj) = (value)))
#define atomic_thread_fence(order) __asm__ volatile("mfence" ::: "memory")
#define atomic_signal_fence(order) __asm__ volatile("" ::: "memory")
#define atomic_compare_exchange_strong_explicit(object, expected, desired, \
success_order, failure_order) \
__extension__({ \
char DidIt; \
__typeof__(object) IfThing = (object); \
__typeof__(IfThing) IsEqualToMe = (expected); \
__typeof__(*IfThing) ReplaceItWithMe = (desired), ax; \
(void)(success_order); \
(void)(failure_order); \
__asm__ volatile("lock cmpxchg\t%3,(%1)\n\t" \
"setz\t%b0" \
: "=q"(DidIt), "=r"(IfThing), "+a"(ax) \
: "r"(ReplaceItWithMe), "2"(*IsEqualToMe) \
: "memory", "cc"); \
*IsEqualToMe = ax; \
DidIt; \
})
#define atomic_compare_exchange_weak_explicit(object, expected, desired, \
success_order, failure_order) \
atomic_compare_exchange_strong_explicit(object, expected, desired, \
success_order, failure_order)
#define atomic_exchange_explicit(object, desired, order) \
__extension__({ \
__typeof__(object) __o = (object); \
__typeof__(*__o) __d = (desired); \
(void)(order); \
__asm__ volatile("xchg\t%0,%1" : "=r"(__d), "+m"(*__o) : "0"(__d)); \
__d; \
})
#define atomic_fetch_add_explicit(object, operand, order) \
__extension__({ \
__typeof__(object) __o = (object); \
__typeof__(*__o) __d = (desired); \
(void)(order); \
__asm__ volatile("lock xadd\t%0,%1" : "=r"(__d), "+m"(*__o) : "0"(__d)); \
__d; \
})
#define atomic_fetch_sub_explicit(object, operand, order) \
atomic_fetch_add_explicit(object, -(operand), order)
#define atomic_load_explicit(object, order) \
atomic_fetch_add_explicit(object, 0, order)
#define atomic_store_explicit(object, desired, order) \
((void)atomic_exchange_explicit(object, desired, order))
#else /* non-gcc or old gcc w/o x86 */
#error "atomic operations not supported with this compiler and/or architecture"
#endif
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_BITS_ATOMIC_H_ */