Collaborative Processing: Synchronization with semaphores and shared memory

Published: 14 April 2026
on channel: Education_Nextlevel

1. Introduction to Shared Memory:
o Create shared memory using shmget().
o Attach to and detach from shared memory using shmat() and shmdt().
2. Introduction to Semaphores:
o Use semaphores for synchronizing processes.
o System calls for semaphore operations (semget(), semctl()).
3. Hands-On Activities:
o Create two processes where the parent writes to shared memory, and the child reads it.
o Use semaphores to ensure the proper sequence of operations.
Common Commands and Code Snippets:
Create Shared Memory Segment
key_t key = ftok("shmfile", 65);
int shmid = shmget(key, 1024, 0666|IPC_CREAT);
Creates a shared memory segment.
Attach Shared Memory
char *str = (char*) shmat(shmid, (void*)0, 0);
Attaches the shared memory segment to the process.
Semaphore Operations

Ex. No. 09 Collaborative Processing: Synchronization with Semaphores and Shared
Memory Date.

sem_t *sem = sem_open("/sem_example", O_CREAT, 0666, 1);
sem_wait(sem); // Wait
sem_post(sem); // Signal

Controls access to shared resources using semaphores.
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Detach Shared Memory
shmdt(str);
Detaches shared memory after use.
Destroy Shared Memory
shmctl(shmid, IPC_RMID, NULL);
Destroys the shared memory segment after use.

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