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| author | Rich Felker <dalias@aerifal.cx> | 2011-09-27 13:50:29 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-09-27 13:50:29 -0400 |
| commit | 60164570111873175111cf8a5b973375e492eee9 (patch) | |
| tree | 1557931c4e0bacd2be217965be08031d5e3a4e51 /src/thread/pthread_barrier_init.c | |
| parent | 3f39c9b3130cd6c142d358159879b799370a6663 (diff) | |
| download | musl-60164570111873175111cf8a5b973375e492eee9.tar.gz | |
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/thread/pthread_barrier_init.c')
| -rw-r--r-- | src/thread/pthread_barrier_init.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/thread/pthread_barrier_init.c b/src/thread/pthread_barrier_init.c index 736d1014..ccaab4eb 100644 --- a/src/thread/pthread_barrier_init.c +++ b/src/thread/pthread_barrier_init.c @@ -2,7 +2,7 @@ int pthread_barrier_init(pthread_barrier_t *b, const pthread_barrierattr_t *a, unsigned count) { - if (!count) return EINVAL; - *b = (pthread_barrier_t){ ._b_limit = count-1 }; + if (count-1 > INT_MAX-1) return EINVAL; + *b = (pthread_barrier_t){ ._b_limit = count-1 | (a?*a:0) }; return 0; } |