Ruby Return Value From Thread

A new thread will be created to execute the code in the block and the original thread will return from thread new immediately and resume execution with the next.

Ruby return value from thread.

Notice that you still have to wait for the command to finish unless you run it inside a thread. Retrieving the value of a future is done through the value alias. Ruby threads are a lightweight and efficient way to achieve concurrency in your code. New puts whats the big deal.

6 updated with jörg s sept 2011 comment. Then we are able to pause the execution of the main thread and allow our new. For example we can create a new thread separate from the main thread s execution using new. For example we can create a new thread separate from the main thread s execution using new.

To start a new thread just associate a block with a call to thread new. You seem to be confusing two very different things here. When a future is rejected a call to value will return nil immediately. Usr bin ruby for i in 0 5 if i 2 then break end puts value of local variable is i end this will produce the following result value of local variable is 0 value of local variable is 1 value of local variable is 2 ruby next statement syntax next jumps to the next iteration of the most internal loop.

Ruby procs lambdas also have another special attribute. Then we are able to pause the execution of the main thread and allow our new. Multiple calls to get will not cause the task to be rerun in the thread. Threads are the ruby implementation for a concurrent programming model.

Threads are the ruby implementation for a concurrent programming model. New puts what s the big deal. Obtaining the value of a future is a potentially blocking operation. When the get method of future is later called the future will either have the value immediately if the task runs quickly as in this case or will wait until the value is done generating.

These two examples will return a string with the output of the ls command. How to use fork exec to run external commands on a separate process. The ruby programming language and the specific threading model of. Does ruby have real multithreading.

The only requirement of call is the value is returned at the end of the call. This concept which is sometimes called closure means that a proc will carry with it values like local variables and methods from the context where it was defined. Programs that require multiple threads of execution are a perfect candidate for ruby s thread class. When a future is fulfilled a call to value will immediately return the current value.