getcpu systemcall not implemented correctly

[Chronial]

Windows build number: 10.0.18363.778

The getcpu systemcall always reports that the process is running on core 0.

Minimal Example:

#include <iostream>
#include <sys/syscall.h>
#include <thread>

int main(){
    for(int i=0; i < 100; i++){
        std::thread([]{
            std::cout << sched_getcpu();
        }).detach();
    }
    return 0;
}

Running g++ main.cpp -lpthread && ./a.out always prints a row of 0. On a Linux it prints numbers between 0 and the number of cores of the cpu.

This is probably the cause of #3294

[therealkenc]

That's a great analysis and repro. Yes almost certainly cause of #3294. Better on WSL2.

[Chronial]

Are WSL bugs not beeing fixed any more? Is there an official announcement about this?