#include <iostream> #include <thread> #include <atomic> std::atomic<long long> data; void do_work() { data.fetch_add(1, std::memory_order_relaxed); } int main() { std::thread th1(do_work); std::thread th2(do_wor
若为访问实际函数压制宏定义(例如像 (atomic_fetch_add)(...) 这样加括号),或程序定义拥有泛型函数名的外部标识符,则行为未定义。 对于有符号整数类型,定义算术为使用补码表示。无未定义结果。对于指针类型,结果可能是未定义地址,但运算不会另有未定义行为。
T fetch_add(T arg,std::memory_orderorder= std::memory_order_seq_cst)volatilenoexcept; (2)(since C++11) member only ofatomic<T*>partial specialization T*fetch_add(std::ptrdiff_targ, std::memory_orderorder= std::memory_order_seq_cst)noexcept; ...
#include <atomic> std::atomic<int> value(0); value.fetch_add(1, std::memory_order_acq_rel)...
std::atomic_ref<T>::fetch_add C++ Concurrency support library std::atomic_ref member only ofatomic_ref<Integral>andatomic_ref<Floating>template specializations T fetch_add(T arg, std::memory_orderorder=std::memory_order_seq_cst)constnoexcept; ...
:ignite() .mount("/", routes![index, count]) .manage(HitCount(AtomicUsize::new(0)...
atomic<size_t> weak_cnt{0}; voidadd_shared_cnt(){ shared_cnt.fetch_add(1); } voidsub_shared_cnt(){ shared_cnt.fetch_sub(1); } }; template<typenameT> structshared_ptr { T *obj_{nullptr}; RefCnt *ref_cnt_{nullptr}; shared_ptr(T *obj) :obj_(obj) ...
execute([&counter] { std::this_thread::sleep_for(10ms); std::atomic_fetch_add(&counter, 1); counter.notify_all(); }); 51 52 REQUIRE(pool.numThreads() == 1); 52 - pool.execute([&counter] { std::this_thread::sleep_for(std::chrono::milliseconds(10)); std::atomic_fetch_...
std::atomic_fetch_add_explicit(&fun, 0, std::memory_order_relaxed); } { std::atomic<void (*)(int)> fun; // expected-error-re@*:* {{{(static_assert|static assertion)}} failed due to requirement '!is_function<void (int)>::value'{{.*}}Pointer to function isn't allowed}} //...
GNU/Linux上linux kernel中atomic_32.h GCC中的Atomic Builtins(__sync_fetch_and_add()等) Java中的java.util.concurrent.atomic C++0x中的atomic operation Intel TBB中的atomic operation 4. 参考文献: [1]关于变量操作的原子性(atomicity)FAQ [2]http://en.wikipedia.org/wiki/Atomic_operation ...