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Why do I get a “unable to initialize mutex: Function not implemented” error?

April 26, 2017Error function implemented initialize mutex

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Why do I get a “unable to initialize mutex: Function not implemented” error?

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The most common reason for this error in a Berkeley DB application is that a system call underlying a mutex configured by Berkeley DB is not available on the system, thus, the return of ENOSYS, (which is the system error associated with the “Function not implemented” message). Generally, this happens because the Berkeley DB library build was specifically configured to use POSIX mutexes, and POSIX mutexes aren’t available on this system, or the library was configured on a different system where POSIX mutexes were available, and then the library was physically moved to a system where POSIX mutexes were not available. We see this error occasionally on Linux systems, because some Linux systems have POSIX mutex support in the C library configuration, but not in the operating system, or the POSIX mutex support they have is only for intra-process mutexes, not inter-process mutexes.