CODEWITHSUNDEEP
linuxmultithreading
Lilian Vault
Lilian Vault

Reputation: 486

Linux thread state on sleep call

I have recently read some papers on the Linux thread scheduler (some simple introductions on the subject). In those the different states a linux thread can have were explained (ready, running, waiting, ...). I'm now wondering if calling a sleep-like method (sleep() in C, this_thread::sleep_for in C++, Thread.Sleep() in C#, etc) sets the thread's state at OS level. Even though I guess it should, I just want to be sure, since I'm a little confused. Thanks

Upvotes: 0

Views: 437

Answers (1)

Lilian Vault
Lilian Vault

Reputation: 486

According to what suggested Ulrich Eckhardt, I tried it by myself:

#include <unistd.h>

int main() {
    sleep(60);
    return 0;
}

$ gcc test.c -o test
$ ./test &
$ top -H -p $(pidof test)

And among other stuff, I got:

Threads:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie

So indeed calling a sleep-like function sets the OS level thread's state to 'sleeping'.

Upvotes: 1

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