Break in a thread but continue other threads

[Nicholas Mc Guire]

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> Is it possible to put a break in one thread but continue all the other
> threads? Our developers keep lamenting to me the inadequacies of the gdb
> debugger in debugging our run time configured multi-threaded
> applications. In several cases I can answer read the manual but in
> others I know the persons diligence and capabilities. While ddd is ok it
> would not be considered a great interface by any standard. I peronally
> am not complaining as I do not use any of the integrated development
> environments but I get plenty of input from the developer community;
> 300+ on just one program.
>

One posible solution for this problem would be to use tracepoints - we
have completed the first version of tracepoints for Linux (PPC,MIPS,X86)
and it is available via cvs at:

  cvs -d :pserver:anoncvs@dslab.lzu.edu.cn:/home/cvs login
  password: anoncvs
  cvs -d :pserver:anoncvs@dslab.lzu.edu.cn:/home/cvs co tracepoints

In the cvs you also can find a preliminary user manual - but this is still
work in progress.
Its also in ftp (cvs snapshot) at:

  ftp://dslab.lzu.edu.cn:/pub/gdb_tracepoints

the monolitic patches for the current version are in:

  ftp://dslab.lzu.edu.cn:/pub/gdb_tracepoints/tracepoint-release/tracepoint-0.2

basically you only need that one patch file unless you are interested in 
the internals and want to join in (which we off course don't mind).

Note though that there are some principle problems with ptrace based 
debugging (on Linux at least) as a thread that enteres via ptrace_stop
are delayed until the next tick, which causes relatively large delays -
this seems to be a Linux "bug" though which simply did not bother anybody
as long as breakpoints are interactive only.

hofrat
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