[sage-devel] Re: ImportError: This platform lacks a functioning sem_open implementation, ... see issue 3770

[Kamil Pliszka]

Hi,
Thx for your suggestion, in python2-2.7.13.p0.log I've found:
"checking whether POSIX semaphores are enabled... no"
It seems that python compiled without semaphores, but error comes 
from sagelib-7.6 package.
It looks that /dev/shm was disabled on my box(when I was compiling 
python27), then I enabled seamphores, and after that run again make - so it 
started from building sagelib(python was still compiled without semaphores).

I've cleaned previous build, started building again, and works fine.
Greets.

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[sage-devel] Re: ImportError: This platform lacks a functioning sem_open implementation, ... see issue 3770

[Volker Braun]

Is there something in the Python build log 
(logs/pkgs/python2-2.7.13.p1.log) that would explain the issue with 
semaphores?


On Thursday, May 11, 2017 at 7:50:33 PM UTC+2, Kamil Pliszka wrote:
>
> Hi,
> I have problem when compiling sage7.6:
>
> ...
> [sagelib-7.6] building 'sage.tests.stl_vector' extension
> [sagelib-7.6] building 'sage.tests.cython' extension
> [sagelib-7.6] Executing 454 commands (using 1 thread)
> [sagelib-7.6] 
> 
> [sagelib-7.6] Traceback (most recent call last):
> [sagelib-7.6]   File "setup.py", line 768, in 
> [sagelib-7.6] ext_modules = ext_modules)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/core.py", line 151, in 
> setup
> [sagelib-7.6] dist.run_commands()
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/dist.py", line 953, in 
> run_commands
> [sagelib-7.6] self.run_command(cmd)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/dist.py", line 972, in 
> run_command
> [sagelib-7.6] cmd_obj.run()
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/command/build.py", line 
> 127, in run
> [sagelib-7.6] self.run_command(cmd_name)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/cmd.py", line 326, in 
> run_command
> [sagelib-7.6] self.distribution.run_command(command)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/dist.py", line 972, in 
> run_command
> [sagelib-7.6] cmd_obj.run()
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/distutils/command/build_ext.py", 
> line 340, in run
> [sagelib-7.6] self.build_extensions()
> [sagelib-7.6]   File "setup.py", line 514, in build_extensions
> [sagelib-7.6] execute_list_of_commands(compile_commands)
> [sagelib-7.6]   File "setup.py", line 316, in execute_list_of_commands
> [sagelib-7.6] execute_list_of_commands_in_parallel(command_list, 
> nthreads)
> [sagelib-7.6]   File "setup.py", line 263, in 
> execute_list_of_commands_in_parallel
> [sagelib-7.6] pool = Pool(nthreads)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/multiprocessing/__init__.py", 
> line 232, in Pool
> [sagelib-7.6] return Pool(processes, initializer, initargs, 
> maxtasksperchild)
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/multiprocessing/pool.py", line 
> 138, in __init__
> [sagelib-7.6] self._setup_queues()
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/multiprocessing/pool.py", line 
> 233, in _setup_queues
> [sagelib-7.6] from .queues import SimpleQueue
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/multiprocessing/queues.py", line 
> 48, in 
> [sagelib-7.6] from .synchronize import Lock, BoundedSemaphore, 
> Semaphore, Condition
> [sagelib-7.6]   File 
> "/usr/local/src/sage-7.6/local/lib/python/multiprocessing/synchronize.py", 
> line 59, in 
> [sagelib-7.6] " function, see issue 3770.")
> [sagelib-7.6] ImportError: This platform lacks a functioning sem_open 
> implementation, therefore, the required synchronization primitives needed 
> will not function, see issue 3770.
> [sagelib-7.6] 
> 
> [sagelib-7.6] Error building the Sage library
> [sagelib-7.6] 
> 
> [sagelib-7.6] Please email sage-devel (
> http://groups.google.com/group/sage-devel)
> [sagelib-7.6] explaining the problem and including the relevant part of 
> the log file
> [sagelib-7.6]   /usr/local/src/sage-7.6/logs/pkgs/sagelib-7.6.log
> [sagelib-7.6] Describe your computer, operating system, etc.
> [sagelib-7.6] 
> 
> [sagelib-7.6] make[3]: *** [Makefile:34: sage] Error 1
> [sagelib-7.6] make[3]: Leaving directory '/usr/local/src/sage-7.6/src'
> [sagelib-7.6] 
> [sagelib-7.6] real  0m2.641s
> [sagelib-7.6] user  0m2.474s
> [sagelib-7.6] sys   0m0.150s
> make[2]: *** [Makefile:1040: sagelib] Error 2
> make[2]: Leaving directory '/usr/local/src/sage-7.6/build/make'
> make[1]: *** [Makefile:912: all] Error 2
> make[1]: Leaving directory '/usr/local/src/sage-7.6/build/make'
>
> real0m3.087s
> user0m2.863s
> sys 0m0.192s
> ***
> Error building Sage.
>
> The following package(s) may have failed to build (not necessarily
> during this run of 'make all'):
>
> * package: sagelib-7.6
>   log file: /usr/local/src/sage-7.6/logs/pkgs/sagelib-7.6.log
>   build directory: 
> /usr/local/src/sage-7.6/local/var/tmp/sage/build/sagelib-7.6
>
> The build directory may contain configuration files and other potentially
> helpful information. WARNING: if you now run 'make' again, the build
> directory will, by