October 2017
Intermediate to advanced
354 pages
9h 28m
English
Content preview from Mastering Linux Kernel Development
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Shared memory
Unlike message queues, which offer a process-persistent messaging infrastructure, the shared memory service of IPC provides kernel-persistent memory that can be attached by an arbitrary number of processes that share common data. A shared memory infrastructure provides operation interfaces to allocate, attach, detach, and destroy shared memory regions. A process that needs access to shared data will attach or map a shared memory region into its address space; it can then access data in shared memory through the address returned by the mapping routine. This makes shared memory one of the fastest means of IPC since from a process's perspective it is akin to accessing local memory, which does not involve switch into kernel mode. ...
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