![]() ![]() Let's make that a little wider so it shows well, and you can see the two key, includes time and signal header files. And itimer.c all set line numbers on and we'll walk through this code line by line. So everything should just make in these examples without error. So I'll go ahead and vi itimer well first I'll go ahead and make everything. And then we'll use it in a follow on example in a generic sequencer that is driven by an interval timer, rather than, say the nano asleep in the loop as we've seen before. So let's look at the real simple itimer.c and make sure we understand that. ![]() And this could be useful for generic sequencing, if we don't have a hardware interrupt source to request services, and it would be an alternative to having any sort of delay in the loop. But this does the same thing in user space. Rearming itself and re aising that in that interrupt over and over. In Linux user space this emulates having a hardwareable interval timer that would raise a hardware interrupt in kernel space on a specific interval. It's a basically an interval timer that would raise a signal on a periodic interval. And then posix rt_timer actually comes from example in the manual pages, but let's look at itimer. The other examples provide a software watchdog timer example just a general POSIX timer example. As you can see here, and I'm going to walk through itimer.c. Okay, so I've downloaded an example timer zip file, and inside the zip file you'll find a number of C code examples. ![]()
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