Dan Leehr (Do not use) Leehro
Leehro
/ semaphore.m
Created
October 30, 2013 19:18
I love this. Use a dispatch_semaphore_t to limit how many blocks you dispatch to a queue.
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| dispatch_semaphore_t semaphore = dispatch_semaphore_create(1); | |
| // Then in some loop ... | |
| if(dispatch_semaphore_wait(semaphore, DISPATCH_TIME_NOW) == 0) { | |
| dispatch_async(queue, ^{ | |
| // Some code that needs to run but doesn't need to fill up the queue. | |
| // | |
| dispatch_semaphore_signal(semaphore); | |
| }); |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style></style> | |
| <body> | |
| <div id="bar-demo"></div> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| // now moving onto books read per year | |
| // set up an array of the data |