Anonymous structs cannot be forward declared and have no benefit.

pthread_cond_wait is supposed to return an integer,
and indeed does sometimes. Fix its function declaration
to match its behavior and POSIX.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Also add "volatile" to broadcast flag (since it is used from
multiple threads).
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

This fixes a deadlock VLC triggered with multithreaded decoding. The
wait forces one of the current waiters to wake and not the thread
which calls pthread_cond_signal() itself.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>

This allows using these wrappers in the gcrypt mutex callbacks.
Signed-off-by: Martin Storsjö <martin@martin.st>

Replace our incomplete w32threads implementation with x264's pthreads
w32threads wrapper.
Relicensed to LGPL with kind permission by Pegasys Inc.
Signed-off-by: Janne Grunau <janne-libav@jannau.net>