how to have a shared variable in library across all application in linux (c++)?
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how to have a shared variable in library across all application in linux (c++)?
You can use POSIX shared memory to create a shared memory segment, and place the variable there. You will need to synchronise access to the shared variable using POSIX semaphores.
See the shm_overview(7) and sem_overview(7) man pages to get started.