semget()

• Usage:

  #include <sys/types.h>
  
  #include <sys/ipc.h>
  #include <sys/sem.h>
  #include <sys/stat.h>
  int semget( key_t key, int nsems, int semflg );

• Creates a semaphore set and initializes each element to zero

• Example:

  int semID = semget( IPC_PRIVATE, 1,
  
  S_IRUSR | S_IWUSR );

• Like shared memory, icps and ipcrm can list and remove semaphores

Previous slide

Next slide

Back to first slide

View graphic version