CS 160 Lab 6

Introduction to PVM Programming

Objective

Outline of Lab

1. Let's start from "hello world !"
   Makefile
   hello.cc
   hello_other.cc
   Can't run it? Make sure you have started pvm daemon.
2. PVM routines (all the following routines can be found from URL: PVM 3 User Guide [ug.ps] )

   #include pvm3.h
   
   int tid= pvm_mytid(void);
   int numt= pvm_spawn(char *task, char **argv, int flag, char *where, int ntask, int *tids);
   int info= pvm_exit(void);
   int bufid= pvm_initsend(int encoding);
   int info= pvm_pk*(..);
   int info= pvm_send(int tid, int msgtag);
   int bufid= pvm_recv(int tid, int msgtag);
   int info= pvm_bufinfo(int bufid, int *bytes, int *msgtag, int *tid);
   int info= pvm_upk*(..);
   int size= pvm_joingroup(char *group);
   int tid= pvm_gettid(char *group, int instance_num);
   int size= pvm_gsize(char *group);
   

3. semaphores

   #include semaphore.h
   
   int sem_init(sem_t *sem, int pshared, unsigned int value);
   //here pshared should be 0 to indicate that the semaphore is local
   int sem_wait(sem_t * sem);
   int sem_post(sem_t * sem);
   int sem_destroy(sem_t * sem);
   

4. Hints to Assignment Two
   a) Client/Server, two seperate programs
   b) one server with multiple clients
   c) read/write locks on data list
   d) database file location
   
   
5. Reminders to Assignment Two
   a) thread-safe issues
   b) halt pvm after usage