thodg/libgit2/src

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  • Hash : 59c6c286
    Author : Patrick Steinhardt
    Date : 2016-10-27T12:31:17 

    global: synchronize initialization and shutdown with pthreads

When trying to initialize and tear down global data structures
from different threads at once with `git_libgit2_init` and
`git_libgit2_shutdown`, we race around initializing data. While
we use `pthread_once` to assert that we only initilize data a
single time, we actually reset the `pthread_once_t` on the last
call to `git_libgit2_shutdown`. As resetting this variable is not
synchronized with other threads trying to access it, this is
actually racy when one thread tries to do a complete shutdown of
libgit2 while another thread tries to initialize it.

Fix the issue by creating a mutex which synchronizes `init_once`
and the library shutdown.

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