On Monday, 27 July 2015 at 19:56:15 UTC, Steven Schveighoffer
wrote:
On 7/27/15 3:10 PM, Jack Stouffer wrote:
Hi,
I am currently working through a book on the fundamentals of
computer
concurrency and I wanted to do all of the exercises in D. But
I ran into
a problem when I tried to have a global semaphore:
/usr/local/Cellar/dmd/2.067.1/include/d2/core/sync/semaphore.di(35):
Error: constructor core.sync.semaphore.Semaphore.this
core.sync.semaphore.Semaphore cannot be constructed at compile
time,
because the constructor has no available source code
Here is my code:
import core.sync.semaphore;
import core.thread;
import std.string;
import std.stdio;
shared string data;
shared Semaphore sem = new Semaphore();
This tries to create a new Semaphore class instance at compile
time.
Instead, do this:
shared Semaphore sem;
shared static this() {
sem = new Semaphore();
}
Which will run during runtime startup.
Or, you can initialize in main().
-Steve
Yes, but then core.sync.semaphore doesn't support being shared,
so...
I don't really understand how
https://github.com/D-Programming-Language/druntime/blob/master/src/core/sync/semaphore.d#L356 is managing to avoid this
