Hi Volker,
Interesting finding!
I believe that you get this problem when running without a TApplication
object. See your code below modified to include a TApplication
and it runs without problems with or without gDebug=1;
Rene Brun
#include "TApplication.h"
#include "TThread.h"
#include <iostream>
void* handle(void* ptr) {
int nr = (int) ptr;
while (1) {
TThread::Lock();
std::cerr << "Here I am: " << nr << std::endl;
TThread::UnLock();
sleep(1);
}
}
int main() {
TApplication app("app",0,0);
gDebug = 1;
std::cerr << "Starting Thread 1" << std::endl;
TThread *h1 = new TThread("h1", handle, (void*) 1);
h1->Run();
std::cerr << "Starting Thread 2" << std::endl;
TThread *h2 = new TThread("h2", handle, (void*) 2);
h2->Run();
std::cerr << "Starting Thread 3" << std::endl;
TThread *h3 = new TThread("h3", handle, (void*) 3);
h3->Run();
app.Run();
//while(1) {}
}
On Wed, 11
Jun 2003, Volker Hejny wrote:
> Dear all,
>
> in some recent ROOT version I observed, that some debug output using
> TThread::Printf(...) in TThread::Fun() is now surrounded by an
> if (gDebug) { ... } statement. This reminds me of some old question
> of mine, which I want to repeat now.
>
> Our original problem was, that after a TThread::Run() the correspoding
> thread kept hanging in the first TThread::Printf() call in the
> function TThread::Fun(). Only when commenting out these Printf() calls
> we got our programs run - without any further problems with TThread
> during the last 1 1/2 years. However, we always had to comment out
> these lines in TThread::Fun().
>
> Consider the following small program:
>
> #include "TThread.h"
> #include <iostream>
>
> void* handle(void* ptr) {
> int nr = (int) ptr;
>
> while (1) {
> TThread::Lock();
> std::cerr << "Here I am: " << nr << std::endl;
> TThread::UnLock();
> sleep(1);
> }
> }
>
> int main() {
> // gDebug = 1;
>
> std::cerr << "Starting Thread 1" << std::endl;
> TThread *h1 = new TThread("h1", handle, (void*) 1);
> h1->Run();
> std::cerr << "Starting Thread 2" << std::endl;
> TThread *h2 = new TThread("h2", handle, (void*) 2);
> h2->Run();
> std::cerr << "Starting Thread 3" << std::endl;
> TThread *h3 = new TThread("h3", handle, (void*) 3);
> h3->Run();
> while(1) {}
> }
>
> In this configuration (with the actual cvs version of ROOT) everything
> runs fine on all machines (various Linux distributions). But if one
> enables 'gDebug = 1' the main program reaches the while-loop, but
> the threads are not running but sticking in the TThread::Fun() function.
>
> Since nobody else was complaining about such a behaviour, I assume
> that the this does not occur for other people. Any clue?
>
> Best regards,
> Volker
>
>
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