|author||Rich Felker <email@example.com>||2011-09-27 13:50:29 -0400|
|committer||Rich Felker <firstname.lastname@example.org>||2011-09-27 13:50:29 -0400|
process-shared barrier support, based on discussion with bdonlan
this implementation is rather heavy-weight, but it's the first solution i've found that's actually correct. all waiters actually wait twice at the barrier so that they can synchronize exit, and they hold a "vm lock" that prevents changes to virtual memory mappings (and blocks pthread_barrier_destroy) until all waiters are finished inspecting the barrier. thus, it is safe for any thread to destroy and/or unmap the barrier's memory as soon as pthread_barrier_wait returns, without further synchronization.
Diffstat (limited to 'src/passwd')
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