BACKGROUND Typically, a multithreaded processor or a multi-processor system is capable of processing multiple instruction sequences concurrently. A primary motivating factor driving execution of multiple instruction streams within a single processor…

链接:http://poj.org/problem?id=1860 Currency Exchange Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and performs exchange operations only with these currenc…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 19881   Accepted: 7114 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 23938   Accepted: 8678 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 21349   Accepted: 7653 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 22123   Accepted: 7990 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and pe…

Currency Exchange Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 22180 Accepted: 8015 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies and perfor…

Currency Exchange Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 60000/30000K (Java/Other) Total Submission(s) : 4   Accepted Submission(s) : 2 Problem Description Several currency exchange points are working in our city. Let us suppose that…

点击打开链接 Currency Exchange Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 16635   Accepted: 5821 Description Several currency exchange points are working in our city. Let us suppose that each point specializes in two particular currencies…

SpinLock 自旋锁 spinlock 用于CPU同步, 它的实现是基于CPU锁定数据总线的指令. 当某个CPU锁住数据总线后, 它读一个内存单元(spinlock_t)来判断这个spinlock 是否已经被别的CPU锁住. 如果否, 它写进一个特定值, 表示锁定成功, 然后返回. 如果是, 它会重复以上操作直到成功, 或者spin次数超过一个设定值. 锁定数据总线的指令只能保证一个机器指令内, CPU独占数据总线. 单CPU当然能用spinlock, 但实现上无需锁定数据总线. spinl…