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When there are standardized headers, use these instead of the bloated
os_compat.h.
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Typedefs shouldn't be used, use the bare struct names instead.
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It'll be easier to keep track of what code runs in what
task/thread this way.
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There was a known deadlocking bug in the notify library: when the
other thread set notify->pending after the according check in
notify_wait(), the latter thread was deadlocked. Resolve this by
synchronizing all accesses to notify->pending with the notify object's
mutex. Since notify_signal_sync() was never used, we can remove it.
As a consequence, we don't need notify_enter() and notify_leave()
anymore; eliminate them, too.
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Destroy the mutex when it is not used anymore.
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It is legal to call wakeup_main_task() from within the main thread,
e.g. from within a signal handler. Remove the assertion.
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Remove duplicated code.
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Avoid some duplicated code in main_notify.c.
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The function wait_main_task() is racy: if the function
wakeup_via_cond() sees the mutex is locked just before
wait_main_task() executes pthread_cond_wait(), the main thread blocks
forever.
Work around this issue by adding a "pending" flag just like in my
notify.c code. A standards-compliant solution should be implemented
later.
git-svn-id: https://svn.musicpd.org/mpd/trunk@7365 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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pthread_cond_signal is a no-op if nothing is waiting on it
git-svn-id: https://svn.musicpd.org/mpd/trunk@7351 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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signal is all we need since we only have one waiter and
likely faster
git-svn-id: https://svn.musicpd.org/mpd/trunk@7349 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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Oops, forgot to unlock a mutex
git-svn-id: https://svn.musicpd.org/mpd/trunk@7348 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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The select() in the main event loop blocks now (saving us many
unnecessary wakeups). This interacted badly with the threads
that were trying to wakeup the main task via
pthread_cond_signal() since the main task was not blocked
on a condition variable, but on select().
So now if we detect a need to wakeup the player, we write
to a pipe which select() is watching instead of blindly
calling pthread_cond_signal().
git-svn-id: https://svn.musicpd.org/mpd/trunk@7347 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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