Turned out that documentation, even the official sources, is still sketchy and young.
E.g. I tried to build the following, taken from here:
void* thread_func()
{
stdout.printf("Thread running.\n");
return null;
}
int main(string[] args)
{
if (!Thread.supported())
{
stderr.printf("Cannot run without threads.\n");
return 1;
}
try
{
Thread.create(thread_func, false);
}
catch (ThreadError exc)
{
return 1;
}
return 0;
}It will give up compiling with the following error:$ valac --thread main.vala
main.vala:19.9-19.21: error:
cannot infer generic type argument
for type parameter `GLib.Thread.create.T'
Thread.create(thread_func, false);
^^^^^^^^^^^^^
Compilation failed: 1 error(s), 0 warning(s) The compiler does complain about an actual lack in my code. Infact the declaration of "Thread.create()" is:Thread<T> create<T>(ThreadFunc<T> func, bool joinable)The culprit is the generic type "T" to be passed to the create method.
But the type of what I need to provide?
Thread.create<?>(thread_func, false)It's the return type of the thread function "thread_func" passed as the first parameter to the create method.
Hence I need to call it this way instead:
Thread.create<void*>(thread_func, false)In the case thread_func had returned
bool:Thread.create<bool>(thread_func, false)And so on.
Here's the incomplete documentation for the create method that led me to the initial impasse.
Here is where I found the solution (thanks to Abderrahim Kitouni) instead.
Yeah, a bit of Googling helped me as well.
