For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.
After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft
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/* | |
Example use (from an email I sent) | |
I’m using WhenAny to either register for a callback on any of the pending operations and to use | |
the IO thread that comes up with their respective completion or to execute handling of completed | |
work on the current thread (‘borrowing’ the IO thread). | |
So if I read from a socket and from a queue, first both ops hang. Queue read completes and I get | |
called back on an IO thread which continues the await. I process that completion in the loop. | |
Meanwhile the socket read completes. That IO thread pops up and just registers the fact that it’s |
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Latency Comparison Numbers (~2012) | |
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L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |