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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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32 changed files with 410 additions and 112 deletions
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third_party/libcxx/thread.cc vendored
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@ -7,6 +7,7 @@
//
//===----------------------------------------------------------------------===//
#include "libc/runtime/sysconf.h"
#include "third_party/libcxx/__config"
#ifndef _LIBCPP_HAS_NO_THREADS