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CentOS 7.0 - man page for fcatomiccreate (centos section 3)

FcAtomicCreate(3)														 FcAtomicCreate(3)

FcAtomicCreate - create an FcAtomic object
#include <fontconfig/fontconfig.h> FcAtomic * FcAtomicCreate (const FcChar8 *file);
Creates a data structure containing data needed to control access to file. Writing is done to a separate file. Once that file is complete, the original configuration file is atomically replaced so that reading process always see a consistent and complete file without the need to lock for reading.
Fontconfig version 2.10.95 31 8 2013 FcAtomicCreate(3)