Messages in this thread | | | Date | Sun, 22 Jun 2008 11:14:56 +0200 (CEST) | From | Jan Engelhardt <> | Subject | Re: Any lightweight way for one thread to force another thread to suspend execution? |
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On Sunday 2008-06-22 03:55, Eric Smith wrote: >Andi wrote: >> Any such mechanism will need a syscall, and it's unlikely that >> any syscall will get much cheaper than a kill(SIGSTOP) > >But is there a way for the process sending the SIGSTOP to wait until it >has taken effect? I need a method to *synchronously* stop another >thread. That's why I thought I probably needed something more >elaborate than SIGSTOP, though I'd like to minimize the number of >system calls required.
When it is stopped, the process state changes to "T" (in ps and /proc). Note that debugging a program with gdb or ptrace also puts it in the T state.
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