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C++ Threads question

Started by BombShell Mar 10, 2004 at 8:29 AM 3 replies 450+ views

Original Post

Mar 10, 2004 at 8:29 AM

Hi all, In C++, can one specify that a piece of code in a thread always has to be executed as a whole (i.e. the control must not switch from this thread to another one when it is executing this specific piece of code)? I am doing some timing in a thread, and this code should always be executed as a whole, otherwise (obviously) the timing would be wrong. Is this possible? Anyone any ideas? Thanks in advance! PS I am already using Mutexes for controlling the access to shared variables and resources. Greetings, BombSheLL

amag

Mar 10, 2004 at 8:35 AM

Depends on your OS, in DOS this is quite doable, in Windows >= 95, then no, you're out of luck. That's the meaning of *pre-emptive* multitasking (a thread can lose control anytime).

[edited by - amag on March 10, 2004 9:35:50 AM]

Agony

Mar 10, 2004 at 8:37 AM

I''m almost 100% confident that there''s no C++ specific way. You''d have to use whatever the OS provides. Especially if you want a chunk of code to execute all at once, even preventing the threads of other processes from running. Although at that point, I don''t know if something like that is even available from the OS.

int main() { return *((int*)0); }

BombShell

Mar 10, 2004 at 9:48 AM

Yes I''m using Win32, and all threads belong to the same process, so Critical sections would indeed be more efficient than mutexes. However I''m using the JThread library (lumumba.luc.ac.be/~jori), which only supports mutexes and not critical sections.

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