Re: printf + pthreads+gdb+mintty = hang?
On Tue, May 07, 2013 at 04:22:23PM -0400, Ryan Johnson wrote: Hi all, Running the attached STC inside gdb hangs (zero CPU util, have to kill gdb from Task Manager, killing a.exe doesn't cut it). Compile line used: g++ -Wall -g -mthreads -DBUG bug.cpp I currently have the following package versions: cygwin-1.7.18(0.263/5/3) 2013-04-19 mintty-1.1.3-1 gdb-7.6.50-1 gcc-4.5.3-3 The problem seems to be related to threads calling fprintf inside gdb, it runs fine from the command line, or with printf instead; both fprintf and printf sometimes trigger warning: SuspendThread failed. (winerr 6) (not sure if that matters). Known issue? Easy workaround? New bug? Known, long-standing issue. I put a workaround in the latest snapshot. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: printf + pthreads+gdb+mintty = hang?
On 08/05/2013 2:36 PM, Christopher Faylor wrote: On Tue, May 07, 2013 at 04:22:23PM -0400, Ryan Johnson wrote: Hi all, Running the attached STC inside gdb hangs (zero CPU util, have to kill gdb from Task Manager, killing a.exe doesn't cut it). Compile line used: g++ -Wall -g -mthreads -DBUG bug.cpp I currently have the following package versions: cygwin-1.7.18(0.263/5/3) 2013-04-19 mintty-1.1.3-1 gdb-7.6.50-1 gcc-4.5.3-3 The problem seems to be related to threads calling fprintf inside gdb, it runs fine from the command line, or with printf instead; both fprintf and printf sometimes trigger warning: SuspendThread failed. (winerr 6) (not sure if that matters). Known issue? Easy workaround? New bug? Known, long-standing issue. I put a workaround in the latest snapshot. Hmm. The STC still hangs about 25% of the time (down from ~100%), so things are improved but not fixed. Also, when I hit an assertion failure in my code, gdb successfully breaks in at my breakpoint on abort()---which used to hang---but then hangs as soon as I say up 2 to see the actual source of the assertion failure. Unfortunately, I haven't been able to distill that one down to a reasonable STC: just arranging for a threaded toy app to call abort from multiple threads simultaneously doesn't seem to tickle the bug. Ryan -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: printf + pthreads+gdb+mintty = hang?
On Wed, May 08, 2013 at 04:47:46PM -0400, Ryan Johnson wrote: On 08/05/2013 2:36 PM, Christopher Faylor wrote: On Tue, May 07, 2013 at 04:22:23PM -0400, Ryan Johnson wrote: Hi all, Running the attached STC inside gdb hangs (zero CPU util, have to kill gdb from Task Manager, killing a.exe doesn't cut it). Compile line used: g++ -Wall -g -mthreads -DBUG bug.cpp I currently have the following package versions: cygwin-1.7.18(0.263/5/3) 2013-04-19 mintty-1.1.3-1 gdb-7.6.50-1 gcc-4.5.3-3 The problem seems to be related to threads calling fprintf inside gdb, it runs fine from the command line, or with printf instead; both fprintf and printf sometimes trigger warning: SuspendThread failed. (winerr 6) (not sure if that matters). Known issue? Easy workaround? New bug? Known, long-standing issue. I put a workaround in the latest snapshot. Hmm. The STC still hangs about 25% of the time (down from ~100%), so things are improved but not fixed. Ok. Then I'll go with long standing issue then. I've mentioned the problem with outputting lots os stuff to a pty here many times. cgf -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
