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* threads: use mpv time for mpthread_cond_timedwait wrapperwm42014-05-181-47/+8
| | | | | | Use the time as returned by mp_time_us() for mpthread_cond_timedwait(), instead of calculating the struct timespec value based on a timeout. This (probably) makes it easier to wait for a specific deadline.
* threads: fix function namewm42014-04-231-2/+2
| | | | Closer to the corresponding standard function pthread_cond_timedwait.
* dispatch: move into its own source filewm42014-04-231-228/+0
| | | | | | | This was part of osdep/threads.c out of laziness. But it doesn't contain anything OS dependent. Note that the rest of threads.c actually isn't all that OS dependent either (just some minor ifdeffery to work around the lack of clock_gettime() on OSX).
* threads: fix wait time overflow checkwm42014-02-261-2/+2
| | | | | | | | | | | | | When passing a very large timeout to mpthread_cond_timed_wait(), the calculations could overflow, setting tv_sec to a negative value, and making the pthread_cond_timed_wait() call return immediately. This accidentally made Lua support poll and burn CPU for no reason. The existing overflow check was ineffective on 32 bit systems. tv_sec is usually a long, so adding INT_MAX to it will usually not overflow on 64 bit systems, but on 32 bit systems it's guaranteed to overflow. Simply fix by clamping against a relatively high value. This will work until 1 week before the UNIX time wraps around in 32 bits.
* threads: add a dispatch queue thingwm42014-02-101-0/+229
| | | | | | Makes working with the (still) single-threaded playback thread easier. Might be reusable for other stuff.
* threads: avoid timeout calculation overflowwm42014-02-101-0/+3
| | | | | | | | | It's quite possible to overflow the calculation by setting the timeout to high values. Limit it to INT_MAX, which should be safe. The issue is mainly the secs variable. timespec.tv_sec will normally be 64 bit on sane systems, and we assume it can't overflow by adding INT_MAX to it.
* threads: add function to calculate deadline for timed waitswm42014-01-311-3/+12
| | | | | | | | | | | | Usually, you have to call pthread_cond_timedwait() in a loop (because it can wake up sporadically). If this function is used by another higher level function, which uses a relative timeout, we actually have to reduce the timeout on each iteration - or, simpler, compute the "deadline" at the beginning of the function, and always pass the same absolute time to the waiting function. Might be unsafe if the system time is changed. On the other hand, this is a fundamental race condition with these APIs.
* threads: add wrapper for initializing recursive mutexeswm42014-01-311-0/+11
| | | | Damn this overly verbose pthread API.
* stream: split out pthread helper functionwm42013-11-171-0/+57
Also split the function itself into 3.
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