[netcdfgroup] How to inquire if a NetCDF file is already open for reading or writing?

• To: "netcdfgroup@xxxxxxxxxxxxxxxx" <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: [netcdfgroup] How to inquire if a NetCDF file is already open for reading or writing?
• From: Hernan Arango <arango@xxxxxxxxxxxxxxxxxx>
• Date: Fri, 22 Jan 2021 21:00:49 +0000
• Arc-authentication-results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=marine.rutgers.edu; dmarc=pass action=none header.from=marine.rutgers.edu; dkim=pass header.d=marine.rutgers.edu; arc=none
• Arc-message-signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=c+voINU+Ct1JV7iVE9foJvxHtJWvyK5xjWQsbFuWDz4=; b=Ffy2nSO/fJolcWY2uZomcqRW40CHHx22V4YzEiOOjlHyUm0jl/mZZZad/lAXpuLQYidGyW6ihjMfXANhXm2HOwA7dM7Y7eIbMwcA/QNFpBGDw9GsdKr0WKjizNJC5zUKBC6dJ3doNI/zG3YRXg/VYj/ULlAii9sg7cK40e/JgWcutY7KeIDZL9DYG08AnzB/VJ2IfM41o2nXZ0z14wWFKpvzFU0YERy+QSbOy+dqG5TgHHspEKNkdtlmZccFV2hma+4vVnNWup5e5F2g39d04jiUTzEp+nIlaV9fIHGB7C5UZFR+YZfPW3SiEW+EHmr+vGHHWRdiY0Tu/0wU7sXwkQ==
• Arc-seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=nJfjd5AM5bgL6AUS1dKqE6qR+z8qsDS0G2VQ2xTGcz6C5DaZiUFf26tD/0Bznk8G6sGqLub2UNj07iT1Qb3Hi6mXoeev36S3QF8G2zh2Y0JpNE7njLlM7fSNcPfBA2yKLFdrezejbrPjG2JKB5b13Xje4+N38zzbvKdw+04254N2MkNmIHZuR/MndWMAzsCtu3dhqO+Gbx18/z+nmuy6inyF5zA8Sll/WZtKjvdQ2e7TZPP2HTeuUYoaQi3KOv9LpciR6UWCqbi8YNDemk94+jTebKyAf5iGafh8lfzMrKYTsPEALI6AzaJjIcn7DE96a0b4mn5HXQJY3EODwJupdg==
• Authentication-results: unidata.ucar.edu; dkim=none (message not signed) header.d=none;unidata.ucar.edu; dmarc=none action=none header.from=marine.rutgers.edu;

Hello,

I am wondering if there is a function to determine if a NetCDF is already open 
for reading or writing based on the filename?   I am trying to avoid open too 
many files.   I know that there are ways in Unix to increase the number of open 
files, but that’s not what I am asking.   In parallel I/O running on lots of 
processes, there is a need to avoid opening too many files.   I am using both 
the standard NetCDF library and the PIO library that is the basis of the 
SCORPIO library (https://e3sm.org/scorpio-parallel-io-library).   Therefore, I 
have integer file ID (ncid) and file descriptors of TYPE (file_desc_t).

I am looking for something like:

     ncid=is_nc_open(‘my_file.nc’)
or
     fileDesc=is_pio_open(iosystem, my_paralle_file.nc’)

Thank you, H

----------------------------------------------------------------------
Hernan G. Arango           Department of Marine and Coastal Sciences
arango@xxxxxxxxxxxxxxxxxx<mailto:arango@xxxxxxxxxxxxxxxxxx>  Rutgers University
off: (848) 932-3368        71 Dudley Road
FAX: (732) 932-8578        New Brunswick, NJ 08901-8521, USA

http://www.researchgate.net/profile/Hernan_Arango
http://www.myroms.org
http://www.ocean-modeling.org

• Follow-Ups:
  • Re: [netcdfgroup] How to inquire if a NetCDF file is already open for reading or writing?
    • From: Lucas Villa Real