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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_barrierattr_setpshared.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_barrierattr_setpshared.c')
| -rw-r--r-- | src/thread/pthread_barrierattr_setpshared.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/thread/pthread_barrierattr_setpshared.c b/src/thread/pthread_barrierattr_setpshared.c index d6c7f9a3..1edc95dc 100644 --- a/src/thread/pthread_barrierattr_setpshared.c +++ b/src/thread/pthread_barrierattr_setpshared.c @@ -2,6 +2,6 @@ int pthread_barrierattr_setpshared(pthread_barrierattr_t *a, int pshared) { - *a = !!pshared; + *a = pshared ? INT_MIN : 0; return 0; } |