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在基于数据的生产者消费者结构中,关于队列,下面描述不正确的是

A、当队列中数据达到设定值(如1024个);“进入队列”的线程被动等待,直到队列中有别的线程取出数据,使队列出现空闲位置,才会让新数据入队。但出现空闲之前的入队数据会丢失。

B、队列同数据缓冲区类似,是一个先入先出(FIFO)的数据结构

C、若出队速度大于入队速度,队列中不会有多余数据

D、队列具有调节读写速度的能力

提问人:网友cherwey 发布时间:2022-01-07
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第7题

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第8题

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第9题

Jackson Specialties has been in business for more than 50 years. The company maintains a perpetual inventory system, uses a LIFO flow assumption, and ends its fiscal year at December 31. At year-end, the cost of goods sold and inventory are adjusted to reflect periodic LIFO costing procedures. A railroad strike has delayed the arrival of purchases ordered during the past several months of 2011, and Jackson Specialties has not been able to replenish its inventories as merchandise is sold. At December 22, one product appears in the company's perpetual inventory records at the following unit costs: Purchase Date Quantity Unit Cost Total Cost Nov. 14, 1958 ................................ 3,000 $6 $18,000 Apr. 12, 1959 ................................ 2,000 8 16,000 Available for sale at Dec. 22,2011 5,000 $34,000 Jackson Specialties has another 8,000 units of this product on order at the current wholesale cost of $30 per unit. Because of the railroad strike, however, these units have not yet arrived (the terms of purchase are F.O.B. destination). Jackson Specialties also has an order from a customer who wants to purchase 4,000 units of this product at the retail sales price of $47 per unit. Jackson Specialties intends to make this sale on December 30, regardless of whether the 8,000 units on order arrive by this date. (The 4,000-unit sale will be shipped by truck, F.O.B. shipping point.) Instructions a. Are the units in inventory really more than 50 years old? Explain. b. Prepare a schedule showing the sales revenue, cost of goods sold, and gross profit that will result from this sale on December 30, assuming that the 8,000 units currently on order ( 1 ) arrive before year-end and (2) do not arrive until some time in the following year. (In each computation, show the number of units comprising the cost of goods sold and their related per-unit costs.) c. Comment on these results. d. Might management be wise to delay this sale by a few days? Explain.

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