更新好吧,看起来像在调用 PyGILState_Ensure() 之前添加 PyEval_InitThreads() 就可以了。在我急于解决问题时,我错误地将我的“挂起”归因于 PyEval_InitThreads()。
但是,在阅读了一些 Python 文档后,我想知道这是否是正确的解决方案。
当不知道哪个线程(如果有)当前拥有全局解释器锁时,调用此函数是不安全的。
首先,我正在研究一些修改过的 GNU Radio 代码——尤其是修改过的 gr_bin_statistics_f 块。现在,有一个错误报告(尽管是旧的)几乎描述了我的确切情况。
http://gnuradio.org/redmine/issues/show/199
现在,错误报告中提到的 usrp_spectrum_sense.py 调用 gr_bin_statistics_f (C++),然后定期回调 Python 以重新调整 USRP(无线电)。
以下是调用 Python 代码时发生的情况:
PyGILState_STATE d_gstate;
d_gstate = PyGILState_Ensure();
// call python code
PyGILState_Release(d_gstate);
因此,一旦我们从 Python 代码返回,就会在调用 PyGILState_Release(d_gstate) 时发生分段错误。虽然我的代码与原始的 gr_bin_statistics_f 之间存在差异,但似乎与此无关。
我读到在 PyGILState_Ensure() 之前调用 PyEval_InitThreads() 已经解决了某些人的问题,但这只会导致我的程序挂起。
任何人都可以为我阐明这一点吗?或者是时候向 GNU Radio 邮件列表发送消息了?
在 Fedora 14 x86_64 上使用 Python2.7。
这是 GDB 回溯:
(gdb) c
Continuing.
[New Thread 0x7fabd3a8d700 (LWP 23969)]
[New Thread 0x7fabd328c700 (LWP 23970)]
[New Thread 0x7fabd2a8b700 (LWP 23971)]
[New Thread 0x7fabd228a700 (LWP 23972)]
[New Thread 0x7fabd1a89700 (LWP 23973)]
[New Thread 0x7fabd1288700 (LWP 23974)]
[New Thread 0x7fabd0a87700 (LWP 23975)]
[New Thread 0x7fabbbfff700 (LWP 23976)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fabbbfff700 (LWP 23976)]
0x00000036b3e0db00 in sem_post () from /lib64/libpthread.so.0
(gdb) bt
#0 0x00000036b3e0db00 in sem_post () from /lib64/libpthread.so.0
#1 0x00000036c1317679 in PyThread_release_lock () from /usr/lib64/libpython2.7.so.1.0
#2 0x00007fabd6159c1f in ~ensure_py_gil_state (this=0x2dc6fc0, x=887000000)
at gnuradio_swig_py_general.cc:5593
#3 gr_py_feval_dd::calleval (this=0x2dc6fc0, x=887000000) at gnuradio_swig_py_general.cc:5605
#4 0x00007fabd77c4b6e in gr_noise_level_f::tune_window (this=0x2db3ca0,
target_freq=) at gr_noise_level_f.cc:97
#5 0x00007fabd77c554b in gr_noise_level_f::work (this=0x2db3ca0, noutput_items=7,
input_items=, output_items=)
at gr_noise_level_f.cc:115
#6 0x00007fabd7860714 in gr_sync_block::general_work (this=0x2db3ca0,
noutput_items=, ninput_items=,
input_items=, output_items=) at gr_sync_block.cc:64
#7 0x00007fabd7846ce4 in gr_block_executor::run_one_iteration (this=0x7fabbbffed90)
at gr_block_executor.cc:299
#8 0x00007fabd7864332 in gr_tpb_thread_body::gr_tpb_thread_body (this=0x7fabbbffed90, block=...)
at gr_tpb_thread_body.cc:49
#9 0x00007fabd785cce7 in operator() (function_obj_ptr=...) at gr_scheduler_tpb.cc:42
#10 operator() (function_obj_ptr=...)
at /home/tja/Research/energy/detector/gnuradio-3.3.0/gruel/src/include/gruel/thread_body_wrapper.h:49
#11 boost::detail::function::void_function_obj_invoker0, void>::invoke (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:153
---Type to continue, or q to quit---
#12 0x00007fabd74914ef in operator() (this=)
at /usr/include/boost/function/function_template.hpp:1013
#13 boost::detail::thread_data >::run (this=)
at /usr/include/boost/thread/detail/thread.hpp:61
#14 0x00007fabd725ca55 in thread_proxy () from /usr/lib64/libboost_thread-mt.so.1.44.0
#15 0x00000036b3e06d5b in start_thread () from /lib64/libpthread.so.0
#16 0x00000036b3ae4a7d in clone () from /lib64/libc.so.6
(gdb)
感谢您的关注!