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behavior, creating many threads very quickly. A long debugging session revealed that the Windows implementation of PyThread_start_new_thread() was choked with "laziness" errors: 1. It checked MS _beginthread() for a failure return, but when that happened it returned heap trash as the function result, instead of an id of -1 (the proper error-return value). 2. It didn't consider that the Win32 CreateSemaphore() can fail. 3. When creating a great many threads very quickly, it's quite possible that any particular bootstrap call can take virtually any amount of time to return. But the code waited for a maximum of 5 seconds, and didn't check to see whether the semaphore it was waiting for got signaled. If it in fact timed out, the function could again return heap trash as the function result. This is actually what confused the test program, as the heap trash usually turned out to be 0, and then multiple threads all got id 0 simultaneously, confusing the hell out of threading.py's _active dict (mapping id to thread object). A variety of baffling behaviors followed from that. WRT #1 and #2, error returns are checked now, and "thread.error: can't start new thread" gets raised now if a new thread (or new semaphore) can't be created. WRT #3, we now wait for the semaphore without a timeout. Also removed useless local vrbls, folded long lines, and changed callobj to a stack auto (it was going thru malloc/free instead, for no discernible reason). Bugfix candidate. |
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| .. | ||
| RPM | ||
| ACKS | ||
| AIX-NOTES | ||
| BeOS-NOTES | ||
| BeOS-setup.py | ||
| cheatsheet | ||
| find_recursionlimit.py | ||
| gdbinit | ||
| HISTORY | ||
| indent.pro | ||
| NEWS | ||
| NEWS.help | ||
| Porting | ||
| PURIFY.README | ||
| pymemcompat.h | ||
| python-mode.el | ||
| python.man | ||
| README | ||
| RFD | ||
| setuid-prog.c | ||
| SpecialBuilds.txt | ||
| vgrindefs | ||
Python Misc subdirectory ======================== This directory contains files that wouldn't fit in elsewhere. Some documents are only of historic importance. Files found here ---------------- ACKS Acknowledgements AIX-NOTES Notes for building Python on AIX BeOS-NOTES Notes for building on BeOS BeOS-setup.py setup.py replacement for BeOS, see BeOS-NOTES cheatsheet Quick summary of Python by Ken Manheimer find_recursionlimit.py Script to find a value for sys.maxrecursionlimit gdbinit Handy stuff to put in your .gdbinit file, if you use gdb HISTORY News from previous releases -- oldest last HPUX-NOTES Notes about dynamic loading under HP-UX indent.pro GNU indent profile approximating my C style NEWS News for this release (for some meaning of "this") Porting Mini-FAQ on porting to new platforms PURIFY.README Information for Purify users python.man UNIX man page for the python interpreter python-mode.el Emacs mode for editing Python programs README The file you're reading now RFD Request For Discussion about a Python newsgroup RPM (Old) tools to build RPMs SpecialBuilds.txt Describes extra symbols you can set for debug builds setuid-prog.c C helper program for set-uid Python scripts vgrindefs Python configuration for vgrind (a generic pretty printer)