diff options
Diffstat (limited to 'Doc')
| -rw-r--r-- | Doc/lib/libsys.tex | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex index 6e880ea..09891e0 100644 --- a/Doc/lib/libsys.tex +++ b/Doc/lib/libsys.tex @@ -369,7 +369,11 @@ else: information on the Python profiler. The system's profile function is called similarly to the system's trace function (see \function{settrace()}), but it isn't called for each executed line - of code (only on call and return and when an exception occurs). + of code (only on call and return, but the return event is reported + even when an exception has been set). The function is + thread-specific, but there is no way for the profiler to know about + context switches between threads, so it does not make sense to use + this in the presence of multiple threads. Also, its return value is not used, so it can simply return \code{None}. \end{funcdesc} @@ -389,7 +393,10 @@ else: Set the system's trace function,\index{trace function} which allows you to implement a Python source code debugger in Python. See section \ref{debugger-hooks}, ``How It Works,'' in the chapter on - the Python debugger.\index{debugger} + the Python debugger.\index{debugger} The function is + thread-specific; for a debugger to support multiple threads, it must + be registered using \function{settrace()} for each thread being + debugged. \end{funcdesc} \begin{datadesc}{stdin} |