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Kevin Midboe
184
v1/flask/include/python3.4m/pyatomic.h
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184
v1/flask/include/python3.4m/pyatomic.h
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#ifndef Py_LIMITED_API
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#ifndef Py_ATOMIC_H
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#define Py_ATOMIC_H
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/* XXX: When compilers start offering a stdatomic.h with lock-free
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atomic_int and atomic_address types, include that here and rewrite
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the atomic operations in terms of it. */
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#include "dynamic_annotations.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* This is modeled after the atomics interface from C1x, according to
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* the draft at
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* http://www.open-std.org/JTC1/SC22/wg14/www/docs/n1425.pdf.
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* Operations and types are named the same except with a _Py_ prefix
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* and have the same semantics.
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*
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* Beware, the implementations here are deep magic.
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*/
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typedef enum _Py_memory_order {
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_Py_memory_order_relaxed,
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_Py_memory_order_acquire,
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_Py_memory_order_release,
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_Py_memory_order_acq_rel,
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_Py_memory_order_seq_cst
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} _Py_memory_order;
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typedef struct _Py_atomic_address {
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void *_value;
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} _Py_atomic_address;
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typedef struct _Py_atomic_int {
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int _value;
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} _Py_atomic_int;
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/* Only support GCC (for expression statements) and x86 (for simple
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* atomic semantics) for now */
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#if defined(__GNUC__) && (defined(__i386__) || defined(__amd64))
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static __inline__ void
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_Py_atomic_signal_fence(_Py_memory_order order)
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{
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if (order != _Py_memory_order_relaxed)
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__asm__ volatile("":::"memory");
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}
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static __inline__ void
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_Py_atomic_thread_fence(_Py_memory_order order)
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{
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if (order != _Py_memory_order_relaxed)
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__asm__ volatile("mfence":::"memory");
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}
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/* Tell the race checker about this operation's effects. */
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static __inline__ void
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_Py_ANNOTATE_MEMORY_ORDER(const volatile void *address, _Py_memory_order order)
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{
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(void)address; /* shut up -Wunused-parameter */
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switch(order) {
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case _Py_memory_order_release:
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case _Py_memory_order_acq_rel:
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case _Py_memory_order_seq_cst:
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_Py_ANNOTATE_HAPPENS_BEFORE(address);
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break;
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case _Py_memory_order_relaxed:
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case _Py_memory_order_acquire:
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break;
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}
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switch(order) {
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case _Py_memory_order_acquire:
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case _Py_memory_order_acq_rel:
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case _Py_memory_order_seq_cst:
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_Py_ANNOTATE_HAPPENS_AFTER(address);
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break;
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case _Py_memory_order_relaxed:
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case _Py_memory_order_release:
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break;
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}
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}
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#define _Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, ORDER) \
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__extension__ ({ \
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__typeof__(ATOMIC_VAL) atomic_val = ATOMIC_VAL; \
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__typeof__(atomic_val->_value) new_val = NEW_VAL;\
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volatile __typeof__(new_val) *volatile_data = &atomic_val->_value; \
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_Py_memory_order order = ORDER; \
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_Py_ANNOTATE_MEMORY_ORDER(atomic_val, order); \
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\
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/* Perform the operation. */ \
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_Py_ANNOTATE_IGNORE_WRITES_BEGIN(); \
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switch(order) { \
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case _Py_memory_order_release: \
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_Py_atomic_signal_fence(_Py_memory_order_release); \
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/* fallthrough */ \
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case _Py_memory_order_relaxed: \
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*volatile_data = new_val; \
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break; \
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\
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case _Py_memory_order_acquire: \
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case _Py_memory_order_acq_rel: \
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case _Py_memory_order_seq_cst: \
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__asm__ volatile("xchg %0, %1" \
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: "+r"(new_val) \
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: "m"(atomic_val->_value) \
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: "memory"); \
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break; \
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} \
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_Py_ANNOTATE_IGNORE_WRITES_END(); \
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})
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#define _Py_atomic_load_explicit(ATOMIC_VAL, ORDER) \
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__extension__ ({ \
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__typeof__(ATOMIC_VAL) atomic_val = ATOMIC_VAL; \
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__typeof__(atomic_val->_value) result; \
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volatile __typeof__(result) *volatile_data = &atomic_val->_value; \
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_Py_memory_order order = ORDER; \
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_Py_ANNOTATE_MEMORY_ORDER(atomic_val, order); \
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\
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/* Perform the operation. */ \
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_Py_ANNOTATE_IGNORE_READS_BEGIN(); \
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switch(order) { \
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case _Py_memory_order_release: \
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case _Py_memory_order_acq_rel: \
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case _Py_memory_order_seq_cst: \
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/* Loads on x86 are not releases by default, so need a */ \
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/* thread fence. */ \
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_Py_atomic_thread_fence(_Py_memory_order_release); \
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break; \
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default: \
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/* No fence */ \
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break; \
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} \
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result = *volatile_data; \
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switch(order) { \
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case _Py_memory_order_acquire: \
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case _Py_memory_order_acq_rel: \
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case _Py_memory_order_seq_cst: \
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/* Loads on x86 are automatically acquire operations so */ \
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/* can get by with just a compiler fence. */ \
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_Py_atomic_signal_fence(_Py_memory_order_acquire); \
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break; \
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default: \
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/* No fence */ \
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break; \
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} \
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_Py_ANNOTATE_IGNORE_READS_END(); \
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result; \
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})
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#else /* !gcc x86 */
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/* Fall back to other compilers and processors by assuming that simple
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volatile accesses are atomic. This is false, so people should port
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this. */
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#define _Py_atomic_signal_fence(/*memory_order*/ ORDER) ((void)0)
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#define _Py_atomic_thread_fence(/*memory_order*/ ORDER) ((void)0)
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#define _Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, ORDER) \
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((ATOMIC_VAL)->_value = NEW_VAL)
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#define _Py_atomic_load_explicit(ATOMIC_VAL, ORDER) \
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((ATOMIC_VAL)->_value)
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#endif /* !gcc x86 */
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/* Standardized shortcuts. */
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#define _Py_atomic_store(ATOMIC_VAL, NEW_VAL) \
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_Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, _Py_memory_order_seq_cst)
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#define _Py_atomic_load(ATOMIC_VAL) \
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_Py_atomic_load_explicit(ATOMIC_VAL, _Py_memory_order_seq_cst)
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/* Python-local extensions */
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#define _Py_atomic_store_relaxed(ATOMIC_VAL, NEW_VAL) \
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_Py_atomic_store_explicit(ATOMIC_VAL, NEW_VAL, _Py_memory_order_relaxed)
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#define _Py_atomic_load_relaxed(ATOMIC_VAL) \
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_Py_atomic_load_explicit(ATOMIC_VAL, _Py_memory_order_relaxed)
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#ifdef __cplusplus
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}
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#endif
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#endif /* Py_ATOMIC_H */
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#endif /* Py_LIMITED_API */
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