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Make pthread mutexes more scalable

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pthread_mutex_lock() now uses a better algorithm which goes much faster
in multithreaded environments that have lock contention. This comes at
the cost of adding some fixed-cost overhead to mutex invocations. That
doesn't matter for Cosmopolitan because our core libraries all encode
locking operations as NOP instructions when in single-threaded mode.
Overhead only applies starting the moment you first call clone().
This commit is contained in:
Justine Tunney 2022-09-05 13:06:34 -07:00
parent 7de2f229a7
commit 7ff0ea8c13
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GPG key ID: BE714B4575D6E328
32 changed files with 410 additions and 112 deletions
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libc/intrin/pthread_spin_trylock.c
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@ -23,7 +23,6 @@
*
* Unlike pthread_spin_lock() this function won't block, and instead
* returns an error immediately if the spinlock couldn't be acquired
* furthermore this function doesn't define any error conditions now
*
* @return 0 on success, or errno on error
* @raise EBUSY if lock is already held