Is std::this_thread::sleep_for behaviour defined for signal interupt ( or signal handler) in C++11?

Question

The behavior of sleep() in unistd.h is well defined in Linux http://man7.org/linux/man-pages/man3/sleep.3.html.

Questions:

1. Does the C++11 standard define the behavior of std::this_thread::sleep_for for signal interrupt/signal handler? If yes, is the behavior platform dependent? (I hope not)

2. What is the best approach to implement non-interuptable sleep() in Linux? Based on my knowledge this can be done by blocking all the signals before calling the sleep().

Answer 1

Does the C++11 standard define the behavior of std::this_thread::sleep_for for signal interrupt/signal handler?

No.

is the behavior platform dependent?

Since it's unspecified, it can be.

I tested on linux, and a signal did interrupt the sleep prematurely.

What is the best approach to implement non-interuptable sleep() in Linux?

A best practice is to not need a non-interruptable sleep. sleep returns the time left to sleep if it is interrupted, so to prevent premature wakeup, you can simply resume sleep after interruption using a loop:

int time = 10;
while(time = sleep(time));

Unfortunately, that's not the case with this_thread::sleep_for which doesn't return the time left upon interruption.