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command: add a way to abort asynchronous commands

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Many asynchronous commands are potentially long running operations, such
as loading something from network or running a foreign process.
Obviously it shouldn't just be possible for them to freeze the player if
they don't terminate as expected. Also, there will be situations where
you want to explicitly stop some of those operations explicitly. So add
an infrastructure for this.

Commands have to support this explicitly. The next commit uses this to
actually add support to a command.
This commit is contained in:
wm4
2018-05-12 18:46:37 +02:00
parent ce1f5e78c2
commit e4fb23ed7d
12 changed files with 169 additions and 9 deletions
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2
player/screenshot.c
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@@ -519,7 +519,7 @@ void screenshot_flip(struct MPContext *mpctx)
struct mp_waiter wait = MP_WAITER_INITIALIZER;
void *a[] = {mpctx, &wait};
run_command(mpctx, mp_cmd_clone(ctx->each_frame), screenshot_fin, a);
run_command(mpctx, mp_cmd_clone(ctx->each_frame), NULL, screenshot_fin, a);
// Block (in a reentrant way) until he screenshot was written. Otherwise,
// we could pile up screenshot requests forever.