path: root/misc/thread_tools.c
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* player: some further cleanup of the mp_cancel crapwm42018-05-241-22/+17
| | | | | | | | | | Alway give each demuxer its own mp_cancel instance. This makes management of the mp_cancel things much easier. Also, instead of having add/remove functions for mp_cancel slaves, replace them with a simpler to use set_parent function. Remove cancel_and_free_demuxer(), which had mpctx as parameter only to check an assumption. With this commit, demuxers have their own mp_cancel, so add demux_cancel_and_free() which makes use of it.
* thread_tools: unify mp_cancel POSIX/win32 paths, add featureswm42018-05-241-52/+136
| | | | | | | | | | | | | | | The OS specifics are merged because the resulting ifdeffery is not much worse than the old ifdeffery, but the logic that is now shared is becoming more complex. Create all objects lazily. The intention is to make mp_cancel instances cheaper. POSIX pipes and win32 Events are pretty heavy weight, and are only needed in special situations. Add a mechanism to "chain" mp_cancel instances. Needed by the later commits for whatever reasons. Untested on win32.
* thread_tools: minor simplificationwm42018-05-241-3/+1
* misc: move mp_cancel from stream.c to thread_tools.cwm42018-05-241-0/+130
| | | | | | | | | | | | It seems a bit inappropriate to have dumped this into stream.c, even if it's roughly speaking its main user. At least it made its way somewhat unfortunately to other components not related to the stream or demuxer layer at all. I'm too greedy to give this weird helper its own file, so dump it into thread_tools.c. Probably a somewhat pointless change.
* misc: add a synchronization helperwm42018-05-241-0/+62
This is almost like rendezvous(), except it allows async wakeup, and does not require global state. It will be used by a later commit. struct mp_waiter is intended to be allocated on the stack, and uses an initializer including PTHREAD_MUTEX_INITIALIZER. This is the first case in mpv that it uses PTHREAD_MUTEX_INITIALIZER for stack-allocated mutexes. It seems POSIX still does not allow this formally, but since POSIX is worth less than used toilet paper, I don't really care. Modern OSes use futexes, which means you can make _every_ memory location a lock, and this code tries to make use of it, without using OS specific code. The name of the source file is rather generic, because I intend to dump further small helpers there (or maybe move mp_rendezvous() to it).