boctor

//
//  BaseViewController.m
//
//  Created by Peter Boctor on 5/4/11.
//
//  Copyright (c) 2011 Peter Boctor
// 
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights

rsms

/*
 * KVOChangeScope -- Conveniently mark edits for Key-Value Observations in
 * Objective-C++ in custom setters.
 *
 * Example:
 *
 *    - (void)setFoo:(id)value {
 *       kvo_scoped_change(foo);
 *       // your setter code here which might return at any moment
 *    }

rsms

int main (int argc, const char * argv[]) {
  dispatch_queue_t waitingChairs = dispatch_queue_create("waitingChairs", 0);
  dispatch_queue_t barber = dispatch_queue_create("barber", 0);
  dispatch_semaphore_t semaphore = dispatch_semaphore_create(3);
  NSInteger ident = 0;
  while (++ident) {
    if (dispatch_semaphore_wait(semaphore, DISPATCH_TIME_NOW) != 0) {
      printf("Customer %d turned away\n", ident);
      continue;
    }