1

班级LocalT有其他班级的成员意识到了read-write-mutex。Mutex 在构造函数中初始化并pthread_rwlock_rdlock(&aMutex);用于读取锁。所以，看起来，对互斥类来说一切正常。LocalT但是当某个对象锁定他的互斥成员以供读取时，程序崩溃了。

CSerialize.cpp:2054线是MUTEX.lock_reading();

Thread 6 (Thread 0x80d4e00 (runnable)):
#0  0x4864f11d in pthread_mutex_lock () from /lib/libpthread.so.2
#1  0x4864b558 in pthread_rwlock_init () from /lib/libpthread.so.2
#2  0x4864b659 in pthread_rwlock_rdlock () from /lib/libpthread.so.2
#3  0x0807ae14 in LocalT::serialize (this=0x80d4e00, outbin=@0x7574736b)
    at CSerialize.cpp:2054

其他两个正在运行的线程：

1) 在插座accept();

2）调用时的下一个可运行线程popen()，似乎是它的执行或read来自管道。但是不知道是什么__error()？？？？？？

Thread 1 (Thread 0x8614800 (LWP 100343)):
#0  0x4865b8f9 in __error () from /lib/libpthread.so.2
#1  0x4865a15a in pthread_testcancel () from /lib/libpthread.so.2
#2  0x486425bf in read () from /lib/libpthread.so.2
#3  0x08056340 in UT::execute_popen (command=@0x4865e6bc,
    ptr_output=0xbf2f7d30) at Utils.cpp:75

3）所有其他线程休眠。

我不知道为什么它崩溃了？也许有人可以假设或建议？

==编辑==

这是一个系统（？）线程（我没有创建它，但程序总是有+1线程）。它总是：

Thread 8 (Thread 0x80d4a00 (LWP 100051)):
#0  0x4865a79b in pthread_testcancel () from /lib/libpthread.so.2
#1  0x48652412 in pthread_mutexattr_init () from /lib/libpthread.so.2
#2  0x489fd450 in ?? ()

==EDIT2 - 按要求发送==

(gdb) bt
#0  0x4865a7db in pthread_testcancel () from /lib/libpthread.so.2
#1  0x48652412 in pthread_mutexattr_init () from /lib/libpthread.so.2
#2  0x489fd450 in ?? ()

奇怪……为什么?? ()？

==EDIT3 - 加载核心时==

Program terminated with signal 11, Segmentation fault.
[skiped]
#0  0x4865a7db in pthread_testcancel () from /lib/libpthread.so.2
[New Thread 0x8614800 (LWP 100343)]
[New Thread 0x8614600 (sleeping)]
[New Thread 0x8614400 (sleeping)]
[New Thread 0x8614200 (sleeping)]
[New Thread 0x8614000 (sleeping)]
[New Thread 0x80d4e00 (runnable)]
[New Thread 0x80d4c00 (sleeping)]
[New Thread 0x80d4a00 (LWP 100051)]
[New Thread 0x80d4000 (runnable)]
[New LWP 100802]

(gdb) info thread
* 10 LWP 100802  0x4865a7db in pthread_testcancel () from /lib/libpthread.so.2
  9 Thread 0x80d4000 (runnable)  0x486d7bd3 in accept () from /lib/libc.so.6 -- MAIN() THREAD
  8 Thread 0x80d4a00 (LWP 100051)  0x4865a79b in pthread_testcancel ()
   from /lib/libpthread.so.2 ( UNIDENTIFIED THREAD system()? ) 
  7 Thread 0x80d4c00 (sleeping)  0x48651cb6 in pthread_mutexattr_init ()
   from /lib/libpthread.so.2 (SIGNAL PROCESSOR THREAD)
  6 Thread 0x80d4e00 (runnable)  0x4864f11d in pthread_mutex_lock ()
   from /lib/libpthread.so.2 (MAINTENANCE THREAD)
  5 Thread 0x8614000 (sleeping)  0x48651cb6 in pthread_mutexattr_init ()
   from /lib/libpthread.so.2 (other mutex cond_wait - worker 1)
  4 Thread 0x8614200 (sleeping)  0x48651cb6 in pthread_mutexattr_init ()
   from /lib/libpthread.so.2 (other mutex cond_wait - worker 2 )
  3 Thread 0x8614400 (sleeping)  0x48651cb6 in pthread_mutexattr_init ()
   from /lib/libpthread.so.2 (other mutex cond_wait - worker 3 )
  2 Thread 0x8614600 (sleeping)  0x48651cb6 in pthread_mutexattr_init ()
   from /lib/libpthread.so.2 (other mutex cond_wait - worker 4)
  1 Thread 0x8614800 (LWP 100343)  0x4865b8f9 in __error ()
   from /lib/libpthread.so.2 ( popen() thread see below)

我创建了：1 个维护线程（序列化）、1 个popen()线程、4 个工作线程、1 个主线程、1 个信号线程 = 8 个线程......

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1 回答 1

1

您称为系统线程的线程实际上是您程序的main thread.

其次，到目前为止您共享的信息，看起来您正在获取互斥锁但从未释放它。这会导致不稳定的状态（某些参数的值错误），从而导致崩溃。我相信您也会观察到间歇性挂起。

你能分享backtrace 它什么时候崩溃吗？

于 2012-06-14T23:10:01.683 回答