Pavel Borzenkov authored Jul 21, 2011 and Sebastian Ramacher committed Aug 25, 2011

Currently, zathura crashes while performing ':close' command with the
following error:

GThread-ERROR **: file gthread-posix.c: line 226
(g_cond_free_posix_impl): error 'Device or resource busy' during
'pthread_cond_destroy ((pthread_cond_t *) cond)'

The error is because 'render' thread holds condition variable while
waiting for new pages to render. This patch modifies zathura's code to
correctly kill render thread and free allocated resources when the
document is being closed.

NOTE: should be applied on top of "Allow changing of "pages-per-row"
variable at runtime" commit to avoid conflicts in the
'page_view_set_mode()' function.

Signed-off-by: Pavel Borzenkov <pavel.borzenkov@gmail.com>