[Patch, fortran] PR48298 - [F03] User-Defined Derived-Type IO (DTIO)

[Jerry DeLisle]

On 08/22/2016 08:33 AM, Paul Richard Thomas wrote:
> Hi Dominique,
>
> Thanks for trying this out so quickly and finding this rather
> fundamental problem.
>
> In pr30617, DTIO is obliquely described as recursive IO. It isn't really, is it?
>
> I'll contact Jerry on #gfortran to see what we can do about this.
>
>
> On 22 August 2016 at 17:09, Dominique d'Humières <dominiq@lps.ens.fr> wrote:
>> The executable hangs with
>>
>> Call graph:
>>     2699 Thread_25555235   DispatchQueue_1: com.apple.main-thread  (serial)
>>       2699 get_external_unit  (in libgfortran.3.dylib) + 254  [0x10de297be]  gthr-default.h:748
>>         2699 _pthread_mutex_lock_wait  (in libsystem_pthread.dylib) + 89  [0x7fff96686e4a]
>>           2699 __psynch_mutexwait  (in libsystem_kernel.dylib) + 10  [0x7fff875bfde6]
>>

I am thinking that the parent is holding the mutex lock on the unit. When the 
child tries to access, it is blocked.

I will see if I can reproduce it here and then try to find a solution. Thanks 
for the report.

Regards,

Jerry