Difference between trylock and lock in C

I have watched a few of your videos. I have to say... you explain things well, and you get to the nuts and bolts. Thank you and keep it up! =)

What does errno.h do?

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when mutex_lock was not successful, it can sleep(schedule for other thread). When mutex_trylock() fails, it does the same thing? What is the main difference when mutex_lock and mutex_trylock failed to get the lock?

If trylock == 0 that means it was not locked, so it locks itself then enters the critical section?

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THX

slow down man god damn

Great explaination thank you

Why is there no warning, for reaches end of non-void function (routine)?

thanks for the explanation!

If I don't care what is executed when I don't get the lock or if I don't want anything to execute when I don't get it, would it be okay to just call trylock and not checking for it's value?

So the reason to use trylock is make the waiting threads do something if else if the locked area is used, instead of just wait