Error On Dm Pipe Semaphore
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up working with named pipes and semaphores in linux up vote 2 down vote favorite I've been trying to get my program to work for several hours now and I just can't fgure out what's wrong with my code. It's about passing a variable between processess using pipes. Each process increments it M times. The program works perfectly when I use shared memory, but when I change it to using pipes it's a disaster. Creating or using named pipes doesn't seem to work at all, or I guess I'm just doing it the wrong way. Here's the source code: #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Semaphores with named pipe in windows up vote -3 down vote favorite I want a program for windows i.e. vc++ or c http://stackoverflow.com/questions/8582632/working-with-named-pipes-and-semaphores-in-linux language. I'am new in windows programming Here is my question Using named pipe create a multiple writer scenario and use semaphore to synchronize among multiple writers and single reader and demonstrate the use of semaphore across processes. visual-c++ share|improve this question asked Feb 24 '14 at 11:49 user3346498 13 So what is the question? –egur Feb 24 '14 at 11:54 That's not a question. –starsplusplus Feb 24 '14 at 12:11 http://stackoverflow.com/questions/21986904/semaphores-with-named-pipe-in-windows add a comment| 1 Answer 1 active oldest votes up vote 0 down vote before writing any code, I suggest reading about named pipes (http://msdn.microsoft.com/en-us/library/windows/desktop/aa365590(v=vs.85).aspx) and semaphores (http://msdn.microsoft.com/en-us/library/windows/desktop/ms686946(v=vs.85).aspx). The multiple writers scenario is not that hard to figure out. Use the semaphore to block the desired amount of processes and pipes to communicate between them. share|improve this answer answered Feb 24 '14 at 15:24 Andro 1,60211126 i read about semaphores and named pipe and i created named pipe.i'am able to do send the message through named pipe but in case of multiple writer i'am getting problem. –user3346498 Feb 25 '14 at 5:25 What exactly is the problem? "Problem" is a very general term. –Andro Feb 25 '14 at 10:21 i want a program to understand the semaphores that in case of multiple writer scenario...i want it for windows –user3346498 Feb 26 '14 at 3:59 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged visual-c++ or ask yo
JIRAAgile Help Online Help JIRA Agile Help Gantt Chart Project Help Agile Answers Keyboard https://jira.lsstcorp.org/browse/DM-3149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel Shortcuts About JIRA JIRA Credits Log In Export Tools Data ManagementDM-3149Provide a useful error message when multiprocessing test failsAgile Board Create branch ExportXMLWordPrintable Details Type: Improvement Status: To Do Priority: Major Resolution: Unresolved Fix Version/s: None error on Component/s: pipe_base Labels: None Team: Process Middleware Description I stumbled upon the following problem when building pipe_base: $ cat tests/.tests/testCmdLineTask.py.failed .... CameraMapper: Loading registry registry from /tmp/tmpYDSBOR/_parent/registry.sqlite3 .. ====================================================================== ERROR: testMultiprocess (__main__.CmdLineTaskTestCase) Test multiprocessing at a error on dm very minimal level ---------------------------------------------------------------------- Traceback (most recent call last): File "tests/testCmdLineTask.py", line 140, in testMultiprocess "-j", "5", "--id", "visit=2", "filter=r"]) File "/home/mjuric/miniconda/conda-bld/work/python/lsst/pipe/base/cmdLineTask.py", line 435, in parseAndRun resultList = taskRunner.run(parsedCmd) File "/home/mjuric/miniconda/conda-bld/work/python/lsst/pipe/base/cmdLineTask.py", line 185, in run pool = multiprocessing.Pool(processes=self.numProcesses, maxtasksperchild=1) File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/__init__.py", line 232, in Pool return Pool(processes, initializer, initargs, maxtasksperchild) File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/pool.py", line 138, in __init__ self._setup_queues() File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/pool.py", line 234, in _setup_queues self._inqueue = SimpleQueue() File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/queues.py", line 354, in __init__ self._rlock = Lock() File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/synchronize.py", line 147, in __init__ SemLock.__init__(self, SEMAPHORE, 1, 1) File "/home/mjuric/miniconda/envs/_build/lib/python2.7/multiprocessing/synchronize.py", line 75, in __init__ sl = self._semlock = _multiprocessing.SemLock(kind, value, maxvalue) OSError: [Errno 13] Permission denied ---------------------------------------------------------------------- Ran 8