|dist/threads-shared/shared.xs in perl.git
, implementation is OS specific, see thread.h in perl.git
and for Win32, win32/win32thread.h in perl.git
. On Windows, the lock is a Critical Section which is a hybrid of atomic CPU instruction in best (usual) case, and kernel mode waiting on semaphores in worst case. Perl doesn't use multi-reader single writer locks. Patches welcome.
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