为了方便阅读,我将__kfifo_in中的函数调用直接展开,如下图: 不难发现,老版的 __kfifo_in 就只使用了一个内存屏障,在 memcpy 和修改 fifo->in 之间,这也就是我们之前说的那个不可以省略的 smp_wmb。 如果你年满18周岁以上,又觉得学【C语言】太难?想尝试其...
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volatile keyword in C ( or volatile qualifier in C)The volatile keyword is a qualifier it has a lot of importance in the programming language but problem is that many programmers are not aware of how to use the volatile keyword and when need to qualify a variable from the volatile keyword...
A type qualifier that you can use to declare that an object can be modified in the program by the hardware. the C++11 ISO Standard volatile keyword is different and is supported in Visual Studio when the/volatile:isocompiler option is specified. (For ARM, it's specified by default). The ...
When an atomic load is performed on a shared variable, it reads the entire value as it appeared at a single moment in time. 1. 高级语言与汇编指令的映射 高级语言(如:C/C++),被编译为汇编语言,才能够被执行。因此,高级语言与汇编语言之间,存在着几种简单的映射关系。 •Simple Write –Write ...
Transactional programming requires working with a resource such as a database or a message queue that is capable of participating in a transaction, and able to commit or roll back the changes made during the transaction. Such resources have been around in one form or another for decades. Typica...
Assume this is part of a bigger code (i.e., there is much more code in the parallel region) and that the "do while" loop is used to synchronize all threads (no, I don't want to use a barrier :-) ). Is it possible that prog(p+1) is kept inside a register and its update ...
Transactional programming requires working with a resource such as a database or a message queue that is capable of participating in a transaction, and able to commit or roll back the changes made during the transaction. Such resources have been around in one form or another for decades. Typica...
Assume this is part of a bigger code (i.e., there is much more code in the parallel region) and that the "do while" loop is used to synchronize all threads (no, I don't want to use a barrier :-) ). Is it possible that prog(p+1) is kept inside a register and its update ...
Implications of CPU caching on byte-addressable non-volatile memory programming Byte-addressable non-volatile memory may usher in a new era of computing where in-memory data structures are persistent and can be reused directly across machine restarts. In this context, we study the implications of ...