[zeromq-dev] default MAX_SOCKETS on Windows set to 63?

[KIU Shueng Chuan]

Oops. Should have been "mingw32-make -f Makefile.mingw32"
On 18 Feb 2014 11:04, "Charles Remes" <lists at chuckremes.com> wrote:

> I am using an msys shell to do the compilation directly on Windows (no
> cross-compiling). I just tried to run "mingw32-make Makefile.mingw32" from
> the proper directory but it just said "Nothing to be done for
> Makefile.mingw32" and exited.
>
> I wish I could figure out the secret incantation to get my FD_SETSIZE
> override to work. Better yet, it would be useful if the generated Makefile
> automatically set it to that value when run in a mingw32 build host.
>
>
> On Feb 17, 2014, at 5:42 PM, KIU Shueng Chuan <nixchuan at gmail.com> wrote:
>
> Looking at the ctx.cpp source, setting of MAX_SOCKETS goes through
> clipped_maxsocket() which clips it to "max_fds()-1", where max_fds() is
> equal to FD_SETSIZE as returned by zmq::select_t::max_fds(). So your issue
> does appear to be related to FD_SETSIZE.
>
>
>
> I tried it out again on zeromq4-x 571c668fa2e0b101f607b4c4a34c30da2f174499.
>
> Cross-compile on Linux using MinGW32:
> > CPPFLAGS=-DFD_SETSIZE=1024 ./configure --host=i686-pc-mingw32
>
> > grep CPPFLAGS Makefile
> CPPFLAGS = -pedantic -Werror -Wall -Wno-long-long -D_REENTRANT
> -D_THREAD_SAFE -DFD_SETSIZE=1024 -DZMQ_FORCE_SELECT
>
> Adding the following snippet in one of the source files shows that it does
> get picked up.
> #if FD_SETSIZE!=1024
> #error "FD_SETSIZE wrong"
> #endif
>
>
>
> If you are compiling directly on Windows and do not want to install MSYS
> (using MSYS may yield other quirks!), an alternative to using configure is
> to go to the subdir builds/mingw32.
> There is a simple Makefile.mingw32 there.
> Just run "mingw32-make Makefile.mingw32"
> Haven't tried this for some time and it is supposed to be automatically
> generated nowadays.
>
>
>
> On Tue, Feb 18, 2014 at 12:27 AM, Charles Remes <lists at chuckremes.com>wrote:
>
>> I've tried a few different ways of providing FD_SETSIZE but nothing has
>> worked for me so far.
>>
>> I have tried:
>>
>> * CFLAGS=-DFD_SETSIZE=1024 ./configure
>>
>> * CPPFLAGS=-DFD_SETSIZE=1024 ./configure
>>
>> Neither one is picked up properly by the system. What else should I try?
>>
>> On Feb 14, 2014, at 5:56 PM, KIU Shueng Chuan <nixchuan at gmail.com> wrote:
>>
>> https://github.com/zeromq/czmq/issues/104
>>
>> If compiling using the configure script you need to provide FD_SETSIZE.
>> On 15 Feb 2014 01:28, "Charles Remes" <lists at chuckremes.com> wrote:
>>
>>> I received a bug report from a user who compiled zeromq 4.0.3 on Windows
>>> using 32-bit mingw. The code that blew up was:
>>>
>>> context = LibZMQ.zmq_ctx_new
>>> rc = LibZMQ.zmq_ctx_set(context, ZMQ::MAX_SOCKETS, 1023)
>>>
>>> At this point, "rc" was returning -1 and the error message is "Invalid
>>> Argument". After playing around with this a bit I discovered that the
>>> default MAX_SOCKETS was 63 on this platform.
>>>
>>> context = LibZMQ.zmq_ctx_new
>>> print LibZMQ.zmq_ctx_set(context, ZMQ::MAX_SOCKETS) # => prints "63"
>>>
>>> So, trying to set a value above 63 always fails.
>>>
>>> For further confirmation, I ran "make check" and noted that
>>> "test_ctx_options" also fails (though it doesn't tell me why).
>>>
>>> Does anyone know why MAX_SOCKETS is set to 63 when compiling on Windows
>>> using mingw? When I look at the source, MAX_SOCKETS_DFLT is set to 1023!
>>>
>>> cr
>>>
>>> _______________________________________________
>>> zeromq-dev mailing list
>>> zeromq-dev at lists.zeromq.org
>>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>>
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