Shared Memory Allocation in Parent | Together Java | Page 1

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@past tapir has a question:

karimmokhlis

When I create a shared memory between two processes, for example, does the parent process allocate a space within its own address space (provided by the OS) for the shared memory, or is it outside the parent’s address space?

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<@&987246399047479336> please have a look, thanks.

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TJ-Bot

When I create a shared memory between two processes, for example, does the parent process allocate a space within its own address space (provided by the OS) for the shared memory, or is it outside the parent’s address space?

shared memory? Or is the shared memory allocated in a separate address space that is accessible by both processes?

In the case of shared memory in Unix systems, the parent process typically requests a block of shared memory from the operating system using functions like shmget() or mmap(). This block of memory is then mapped into the address space of both the parent and child processes, allowing them to share data through this common memory region.

The actual allocation and management of this shared memory block are handled by the operating system, which ensures that both processes have proper access to it. The parent process does not allocate a separate space within its own address space for shared memory; instead, it simply requests a region of shared memory from the OS.

It's important to note that proper synchronization mechanisms, such as semaphores or mutexes, should be used when accessing shared memory to prevent conflicts between processes. Additionally, care should be taken to properly release and clean up shared memory resources when they are no longer needed to avoid memory leaks or other issues.

#Shared Memory Allocation in Parent