Hallo, how can I check if a given thread is runinng/finished/sleeping? Jens
On Fri, Jan 30, 2009 at 02:06:09PM +0000, Jens Luedicke wrote:
how can I check if a given thread is runinng/finished/sleeping?
You can't. Even if you could, the information will most probably be wrong by the time you get to use it. What is the actual problem you're trying to solve?
Zeljko Vrba wrote:
On Fri, Jan 30, 2009 at 02:06:09PM +0000, Jens Luedicke wrote:
how can I check if a given thread is runinng/finished/sleeping?
You can't. Even if you could, the information will most probably be wrong by the time you get to use it. What is the actual problem you're trying to solve?
I have three threads. Two of them are independent and they can run in parallel. The third thread depends on results returned by the first and second threads. Right now I use a condition variable to wait in the third thread until the first and second threads are finished (by checking two boolean variables that are set to true once the first and second threads finish). In a later scenario I may need to query those threads anytime to suspend or terminate them (the threads will run trajectory computations for a helicopter: takeoff, approach and cross-country flight). I was wondering if there is a boost-way to obtain state informations about a thread. Jens -- Jens Luedicke web: http://perldude.de
Zeljko Vrba wrote:
On Fri, Jan 30, 2009 at 02:06:09PM +0000, Jens Luedicke wrote:
how can I check if a given thread is runinng/finished/sleeping?
You can't. Even if you could, the information will most probably be wrong by the time you get to use it. What is the actual problem you're trying to solve?
I have three threads. Two of them are independent and they can run in parallel. The third thread depends on results returned by the first and second threads.
I guess thats to easy: thread t1,t2,t3; run 1 + 2 t1.join(); t2.join(); t3.run();
Right now I use a condition variable to wait in the third thread until the first and second threads are finished (by checking two boolean variables that are set to true once the first and second threads finish).
In a later scenario I may need to query those threads anytime to suspend or terminate them (the threads will run trajectory computations for a helicopter: takeoff, approach and cross-country flight).
I was wondering if there is a boost-way to obtain state informations about a thread.
afaik you can send messages between threads, at least I do this a lot in wxWidgets, and boost offers with signal something similar I think. regards, Jens Weller -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger01
On Fri, Jan 30, 2009 at 09:21:57PM +0100, Jens Luedicke wrote:
Right now I use a condition variable to wait in the third thread until the first and second threads are finished (by checking two boolean
What is unsatisfactory with this solution?
In a later scenario I may need to query those threads anytime to suspend or terminate them (the threads will run trajectory computations for a
What do you mean by "query"? It is still not at all clear why do you need to know the thread's state, i.e., which problem are you trying to solve.
participants (3)
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Jens Luedicke -
Jens Weller -
Zeljko Vrba