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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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3
third_party/dlmalloc/dlmalloc.c vendored
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@ -25,8 +25,7 @@
#define HAVE_MMAP 1
#define HAVE_MREMAP 0
#define HAVE_MORECORE 0
#define USE_LOCKS 1
#define USE_SPIN_LOCKS 1
#define USE_LOCKS 2
#define MORECORE_CONTIGUOUS 0
#define MALLOC_INSPECT_ALL 1