
Mastering Linux Kernel Development
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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.
Linux supports legacy SysV shared memory implementation under the IPC subsystem. Similar to SysV message queues, each shared memory region is identified by a unique IPC identifier.
The kernel provides distinct system...
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