c/c++原子操作 接口函数 自查文档

Ｃ：

type __sync_fetch_and_add (type *ptr, type value);type __sync_fetch_and_sub (type *ptr, type value);type __sync_fetch_and_or (type *ptr, type value);type __sync_fetch_and_and (type *ptr, type value);type __sync_fetch_and_xor (type *ptr, type value);type __sync_fetch_and_nand (type *ptr, type value);type __sync_add_and_fetch (type *ptr, type value);type __sync_sub_and_fetch (type *ptr, type value);type __sync_or_and_fetch (type *ptr, type value);type __sync_and_and_fetch (type *ptr, type value);type __sync_xor_and_fetch (type *ptr, type value);type __sync_nand_and_fetch (type *ptr, type value);bool __sync_bool_compare_and_swap (type *ptr, type oldval type newval, ...)type __sync_val_compare_and_swap (type *ptr, type oldval type newval, ...)type __sync_lock_test_and_set (type *ptr, type value, ...)   将*ptr设为value并返回*ptr操作之前的值。void __sync_lock_release (type *ptr, ...)     将*ptr置0

#include <stdio.h>  #include <pthread.h>  #include <stdlib.h>  static int count = 0;  void *test_func(void *arg)  {    int i=0;         for(i=0;i<20000;++i){           __sync_fetch_and_add(&count,1);    }    returnNULL;  }  int main(int argc, const char *argv[])  {    pthread_tid[20];    int i =0;         for(i=0;i<20;++i){           pthread_create(&id[i],NULL,test_func,NULL);    }         for(i=0;i<20;++i){           pthread_join(id[i],NULL);    }         printf("%d\n",count);    return0;  }

c++:查看
http://en.cppreference.com/w/cpp/atomic/atomic

std::atomic_char    std::atomic<char>std::atomic_schar   std::atomic<signed char>std::atomic_uchar   std::atomic<unsigned char>std::atomic_short   std::atomic<short>std::atomic_ushort  std::atomic<unsigned short>std::atomic_int std::atomic<int>std::atomic_uint    std::atomic<unsigned int>std::atomic_long    std::atomic<long>std::atomic_ulong   std::atomic<unsigned long>std::atomic_llong   std::atomic<long long>std::atomic_ullong  std::atomic<unsigned long long>

#include <iostream>#include <thread>#include <atomic>                 // modifiedstd::atomic_long sum = {0L};  　　//  modifiedvoid fun(){    for(int i=0;i<100;++i)        sum += i;}int main(){    std::cout << "Before joining,sun = " << sum << std::endl;    std::thread t1(fun);    std::thread t2(fun);    t1.join();    t2.join();    std::cout << "After joining,sun = " << sum << std::endl;}