Parallel task ventilator in C

// Task ventilator
// Binds PUSH socket to tcp://localhost:5557
// Sends batch of tasks to workers via that socket

#include "zhelpers.h"

int main (void)
{
void *context = zmq_ctx_new ();

// Socket to send messages on
void *sender = zmq_socket (context, ZMQ_PUSH);
zmq_bind (sender, "tcp://*:5557");

// Socket to send start of batch message on
void *sink = zmq_socket (context, ZMQ_PUSH);
zmq_connect (sink, "tcp://localhost:5558");

printf ("Press Enter when the workers are ready: ");
getchar ();
printf ("Sending tasks to workers…\n");

// The first message is "0" and signals start of batch
s_send (sink, "0");

// Initialize random number generator
srandom ((unsigned) time (NULL));

// Send 100 tasks
int task_nbr;
int total_msec = 0; // Total expected cost in msecs
for (task_nbr = 0; task_nbr < 100; task_nbr++) {
int workload;
// Random workload from 1 to 100msecs
workload = randof (100) + 1;
total_msec += workload;
char string [10];
sprintf (string, "%d", workload);
s_send (sender, string);
}
printf ("Total expected cost: %d msec\n", total_msec);

zmq_close (sink);
zmq_close (sender);
zmq_ctx_destroy (context);
return 0;
}