CAS非阻塞锁和synchronized重量级锁比较.docx

cassandra分页查询案例,CAS非阻塞锁和synchronized重量级锁比较,Chromeapp实现网易云音乐歌单播放器,实现网易云音乐歌单播放器,C-minus语言编译器的词法分析部分Crc校验，通过算法验证数据的完整性,css3实现渐变色文字和镂空文字[CSS],cwRsync_4.0.5windows2008下配置,C调用Go的回调函数传递字符串[代码] 函数返回多个对象 # Goals: To write functions# To write functions that send back multiple objects.# FIRST LEARN ABOUT LISTS --X = list(height=5.4, weight=54)print(Use default printing --)print(X)print(Accessing individual elements --)cat(Your height is , X$height, and your weight is , X$weight, \n)//C语言实现双向链表//C语言实现统计字符个数# FUNCTIONS --square - function(x) { return(x*x)}cat(The square of 3 is , square(3), \n) # default value of the arg is set to 5.cube - function(x=5) { return(x*x*x);}cat(Calling cube with 2 : , cube(2), \n) # will give 2^3cat(Calling cube : , cube(), \n) # will default to 5^3.# LEARN ABOUT FUNCTIONS THAT RETURN MULTIPLE OBJECTS --powers - function(x) { parcel = list(x2=x*x, x3=x*x*x, x4=x*x*x*x); return(parcel);}//C语言随机函数rand实现//C语言顺序表完整实例//C语言实现文件的des加解密实例X = powers(3);print(Showing powers of 3 --); print(X);# WRITING THIS COMPACTLY (4 lines instead of 7)powerful - function(x) { return(list(x2=x*x, x3=x*x*x, x4=x*x*x*x));}print(Showing powers of 3 --); print(powerful(3));# In R, the last expression in a function is, by default, what is# returned. So you could equally just say:powerful - function(x) {list(x2=x*x, x3=x*x*x, x4=x*x*x*x)}[代码] 向量符号 # Goal: The amazing R vector notation.cat(EXAMPLE 1: sin(x) for a vector --\n)# Suppose you have a vector x --x = c(0.1,0.6,1.0,1.5)# The bad way --n = length(x)r = numeric(n)for (i in 1:n) { r[i] = sin(x[i])}print(r)# The good way -- dont use loops --print(sin(x))cat(\n\nEXAMPLE 2: Compute the mean of every row of a matrix --\n)# Heres another example. It isnt really about R; its about thinking in# matrix notation. But still.# Let me setup a matrix --N=4; M=100;r = matrix(runif(N*M), N, M)# So I face a NxM matrix# [r11 r12 ... r1N]# [r21 r22 ... r2N]#