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Unnamed Semaphore in Linux User space

As the name suggests, the semaphore does not have a name in the Linux File system. These semaphores are also called as memory-based semaphores. since, the semaphore does not have a name associated with it in the Linux File system, the semaphore needs to be placed in a shared memory region that different processes or […]

Named Semaphore in Linux user space

Named semaphores as the name suggests have a name in the Linux file system. Hence different unrelated processes or threads can open the semaphore by invoking the name. The Named semaphore can be created or an existing instance opened by invoking the “sem_open” API. The API is shown below The name identifies the semaphore. The […]

Locking Mechanisms for Threads

Since Threads share the global heap, initialized data and uninitialized data segment with one another, it is possible that there would be race conditions between two threads. To prevent race conditions and to set up synchronization between the different threads, POSIX supports the following locking or thread synchronization mechanisms. POSIX Semaphores: named semaphores The semaphore […]

POSIX Threads in Linux

Threads are a mechanism that permits an application to perform various tasks. The thread has its own stack but it shares the global memory of the parent process which includes initialized data, uninitialized data, and heap segments. The memory segment sharing is shown below: The threads spawned by a process can execute concurrently. Threads provide […]