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All threads in a process share the same executable program code, and the same global data Each thread can also have some data that is exclusive to the thread Threads can make use of a special structure called a mutex (short for mutual exclusion) or a lock, which can ensure that a particular chunk of code can t be run by multiple threads at once This is useful for ensuring correct outcomes when multiple threads access the same data simultaneously, by locking out other threads when one thread is updating a value (in what s called a critical section of your code) For example, let s say your application implements a banking system, where an account balance can be modified as part of a transaction.

This is a pretty exclusive club that Y Combinator has kind of built So if you ve made it through there, that immediately gets you access to reporters and investors and bloggers and things that you wouldn t otherwise have easy access to It s a bit of a leg up, there There s obviously the huge mentorship that Paul Graham, Trevor Blackwell, and Jessica Livingston all provide They are very generous on that front These guys, obviously You think about what most mentors have They have maybe one startup under their belt or maybe two I think with that, oftentimes you don t necessarily have great pattern recognition You might have seen one way that things succeeded But you ve only really seen one kind of success Paul Graham, having mentored, literally I think he s into about 150 of these companies.

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Recall that you can double-click the source code file name to open a new editing window, or you can click the Editor toolbar icon to open an editing pane within the project window.

Figure 5-6. The operator project window (note that the window has been rearranged a bit to show all of main.c)

I think Paul Graham and all of these guys have a really unique perspective They can see patterns in startups that other people can t see because they don t have the depth of the variety of startup vision that Paul had..

In a multi-threaded system, you need to protect the section of code that adds or subtracts from the account balance, to eliminate the possibility that two threads are both messing with it at the exact same time Otherwise, you might have both threads reading the old balance more or less simultaneously, and both threads later writing back their own ideas of the new balance, oblivious to the changes that the.

Run operator by selecting Build and Run from the Build menu. Xcode will compile main.c, and then link and run the program. Compare your output to that shown in Figure 5-7. They should be about the same.

Tell me to what you pay attention and I will tell you who you are Jose Ortega y Gasset (Spanish philosopher and humanist, 1883 1955) The simple act of paying attention can take you a long way. Keanu Reeves (actor)

other was trying to make, leading to an incorrect final state; whichever sets the value last is the winner, and the other thread s change to the balance is simply lost. A common concern when dealing with threads is the idea of code being thread-safe. Some software libraries are written with concurrency in mind, and have all their critical sections properly protected with mutexes. Some code libraries simply don t. For instance, in Cocoa, the AppKit framework (containing the classes specific to building GUI applications, such as NSApplication, NSView and all its subclasses, and the like) is for the most part not thread-safe. This means that in a running Cocoa application, all method calls that deal with any AppKit objects should be executed from within the same thread, which is commonly known as the main thread. If you access AppKit objects from another thread, all bets are off. You are likely to encounter seemingly inexplicable bugs. By default, the main thread is where all the action of your Cocoa app (such as dealing with actions triggered by user events) occurs, so for simple applications it s nothing you need to worry about. Action methods triggered by a user are already running in the main thread. Up to this point in the book, our code has been running exclusively on the main thread, but that s about to change.

Let s take a look at the operator project s source code. In Xcode, bring main.c in an editing window. main.c starts off with our usual #include of stdio.h. This gives us access to printf().

#include <stdio.h> main() starts out by defining an int named myInt: int main (int argc, const char * argv[]) { int myInt;

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