On Monday, 18 August 2025 at 15:20:14 UTC, Dmitry Olshansky wrote:
On Saturday, 16 August 2025 at 14:51:45 UTC, Dmitry Olshansky
wrote:
[...]
Actually that should be 0.5.5 :)
And v0.13.0 brings new feature - offload to run compute
intensive tasks outside of scheduler. Certain syscalls are
automatically routed through it to avoid blocking fibers such
as file I/O. Here is simple example using goOnSameThread to
make sure we are actually sharing just a single eventloop
thread out of many and yet it doesn't block.
import photon;
double gauss(double a, double b, double function(double) f,
double step) {
double sum = 0.0;
for (double x = a; x < b; x += step) {
sum += (f(x+step) + f(x))/2 * step;
}
return sum;
}
void boom() {
throw new Exception("Boom!");
}
long fib(long n) {
if (n <= 2) return 1;
else {
return offload(() => fib(n-1)) + offload(() =>
fib(n-2));
}
}
void main() {
startloop();
go({
goOnSameThread({
writeln("Blocking computation");
writeln("Integral:", gauss(0.0, 10.0, x => x*x,
1e-7));
});
goOnSameThread({
writeln("Blocking computation");
writeln("Integral:", gauss(0.0, 10.0, x => x*x,
1e-7));
});
goOnSameThread({
writeln("Nonblocking computation");
writeln("Integral: ", offload(() => gauss(0.0,
10.0, x => x*x, 1e-7)));
});
goOnSameThread({
writeln("Nonblocking computation");
writeln("Integral: ", offload(() => gauss(0.0,
10.0, x => x*x, 1e-7)));
});
goOnSameThread({
writeln("Catching exception from offloaded
computation");
try {
offload(&boom);
assert(0);
} catch(Exception e) {
assert(e.msg == "Boom!");
}
});
goOnSameThread({
writeln("Recursive offload");
writeln("Fib(15):", offload(() => fib(15)));
});
});
runFibers();
}
Other photon examples:
https://github.com/DmitryOlshansky/photon/tree/master
I tried to include all the sources of photon in a application
that it's cross-compiled to linux (Pi5, AArch64) and cross-linked
with some C libs, and I'm seeing this:
```
2025-08-31T16:22:18.438 [error] extern(C) private ssize_t
close(int fd) nothrow
src/photon/linux/core.d(1150,27): Previous IR type: i32
(i32)
src/photon/linux/core.d(1150,27): New IR type: i64
(i32)
```
In linux.core.d: extern(C) private ssize_t close(int fd) nothrow
but `man 2 close` is `int close(int fd)`, it's a bug?
