D create many thread
Hi all, I'm create a small (hallo world) application, with DMD. But my program create 7 annoying threads when create an empty class. What is this thread for? and is it normal in D? Below the stack trace of thread creation. #0 0x77f637a0 in pthread_create@@GLIBC_2.2.5 () from /usr/lib/libpthread.so.0 #1 0x557388d0 in core.thread.osthread.createLowLevelThread(void() nothrow delegate, uint, void() nothrow delegate) () #2 0x55731384 in _D2gc4impl12conservativeQw3Gcx16startScanThreadsMFNbZv () #3 0x557307ba in _D2gc4impl12conservativeQw3Gcx11fullcollectMFNbbZm () #4 0x5572eccc in _D2gc4impl12conservativeQw3Gcx10smallAllocMFNbmKmkxC8TypeInfoZPv () #5 0x557346a9 in _D2gc4impl12conservativeQw14ConservativeGC__T9runLockedS_DQCeQCeQCcQCnQBs12mallocNoSyncMFNbmkKmxC8TypeInfoZPvS_DQEgQEgQEeQEp10mallocTimelS_DQFiQFiQFgQFr10numMallocslTmTkTmTxQCzZQFcMFNbKmKkKmKxQDsZQDl () #6 0x5572c2fe in _D2gc4impl12conservativeQw14ConservativeGC6mallocMFNbmkxC8TypeInfoZPv () #7 0x556cd163 in gc_malloc () #8 0x556f529c in _D2gc4impl5protoQo7ProtoGC6mallocMFNbmkxC8TypeInfoZPv () #9 0x556cd163 in gc_malloc () #10 0x556cf55b in _d_newclass () #11 0x556669f4 in D main (args=...) at source/app.d:11 (gdb) info threads Id Target IdFrame * 1Thread 0x77c1ea40 (LWP 8288) "jala2" 0x77f637a0 in pthread_create@@GLIBC_2.2.5 () from /usr/lib/libpthread.so.0 2Thread 0x77fcc700 (LWP 8289) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 3Thread 0x77fc7700 (LWP 8317) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 4Thread 0x77fc2700 (LWP 8329) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 5Thread 0x77fbd700 (LWP 8439) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 6Thread 0x77fb8700 (LWP 8445) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 7Thread 0x77fb3700 (LWP 8463) "jala2" 0x77f69c45 in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0 Thank you in advance.
Re: How to iterate getSymbolsByUDA
static foreach(sym; getSymbolsByUDA!(A, Attr)){
writeln(sym.stringof); // print variable name "a" this what i
want
}
foreach(sym; getSymbolsByUDA!(A, Attr)){
writeln(sym.stringof); // print "sym"
}
foreach(sym; getSymbolsByUDA!(A, Attr)){
writeln(__traits(identifier, sym)); //also print "sym"
}
is there a way to get variable name using foreach like static
foreach?
Re: How to iterate getSymbolsByUDA
On Sunday, 25 November 2018 at 01:01:30 UTC, bauss wrote:
On Saturday, 24 November 2018 at 08:50:59 UTC, Eko Wahyudin
wrote:
On Saturday, 24 November 2018 at 08:09:38 UTC, Stanislav
Blinov wrote:
[...]
aah ya,, this statement is work
static foreach (i; 0 .. symbols.length)
thank you.
It should work with just:
static foreach(sym; getSymbolsByUDA!(A, Attr)){
...
}
or
alias symbols = getSymbolsByUDA!(A, Attr);
static foreach(sym; symbols){
...
}
---
What you were missing was just making it a static foreach.
seems my problem is i use GDC, i got this error
error: basic type expected, not foreach.
Re: How to iterate getSymbolsByUDA
On Saturday, 24 November 2018 at 08:09:38 UTC, Stanislav Blinov
wrote:
On Saturday, 24 November 2018 at 03:48:12 UTC, Eko Wahyudin
wrote:
Hi all,
anyone know how to iterate getSymbolsByUDA ?
enum Attr;
struct A
{
@Attr int a;
int b;
@Attr void foo() {}
@Attr void foo(int) {}
}
void main() {
import std.traits;
import std.stdio;
alias symbols = getSymbolsByUDA!(A, Attr);
A a;
static foreach (i; 0 .. symbols.length) {
writeln("identifier: ", __traits(identifier,
symbols[i]));
static if (is(typeof(symbols[i]) == int)) {
__traits(getMember, a, __traits(identifier,
symbols[i])) = 42;
}
}
assert(a.a == 42);
}
aah ya,, this statement is work
static foreach (i; 0 .. symbols.length)
thank you.
How to iterate getSymbolsByUDA
Hi all,
anyone know how to iterate getSymbolsByUDA ?
I try this code:
enum Attr;
struct A
{
@Attr int a;
int b;
}
//---
//1. Error: need `this` for `a` of type `int`
foreach(sym; getSymbolsByUDA!(A, Attr)){
writeln(sym.stringof);
}
for(sizediff_t i=0; i
how to make interface with return auto
I know it's imposible.
is there's a way if i want to create an interface that have
method with return type value is equals with return type of
std.palallelism.task
eg.
interface IWorker{
auto activate(); //on implementation class activate return
std.parallelism.task
}
What is the replacement of auto on that interface?
Thank you!
How delegate context work?
I'm writing promise library, and perform testing like this..
app = new Application();
Promise p = app.exec(delegate void(){ // first delegate
write("Hello");
std.stdio.stdout.flush;
int xxx = 777;
auto p2 = app.exec!int(delegate int(){ // second
delegate
return xxx;
});
p2.success = delegate void(int result){
writefln("We got result:%d",result);
};
});
with(p){
success = delegate void(){
writeln(" world");
};
}
app.run();
When the my library executing second promise, Supprisingly I got
amazing result, I can do same thing that javascript can do.
I printed "We got result:777".
My question is, on seconds delegate.
How D access xxx variable? where context pointer refer to?
How D keep xxx variable persistent?
Why xxx is not swapped out when we leave first delegate?
isn't that if we leave first delegate we execute RET n (on intel
processor) and make the stack available for another call? so xxx
memory address used by another function?
how this magic thing happen? or i just lucky got uncertain value
but the value is 777 ?
Thank you guys, before.
