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| author | Rich Felker <dalias@aerifal.cx> | 2011-09-28 18:57:18 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-09-28 18:57:18 -0400 |
| commit | 9cee9307e3b8ed31e772d564d1dc53e6d888acba (patch) | |
| tree | 90355be0615b94ba2cd5ddf7581173862ae7a063 /src/internal | |
| parent | 95b147967216a057d51a1b970da777486be716e3 (diff) | |
| download | musl-9cee9307e3b8ed31e772d564d1dc53e6d888acba.tar.gz musl-9cee9307e3b8ed31e772d564d1dc53e6d888acba.tar.bz2 musl-9cee9307e3b8ed31e772d564d1dc53e6d888acba.tar.xz musl-9cee9307e3b8ed31e772d564d1dc53e6d888acba.zip | |
improve pshared barriers
eliminate the sequence number field and instead use the counter as the
futex because of the way the lock is held, sequence numbers are
completely useless, and this frees up a field in the barrier structure
to be used as a waiter count for the count futex, which lets us avoid
some syscalls in the best case.
as of now, self-synchronized destruction and unmapping should be fully
safe. before any thread can return from the barrier, all threads in
the barrier have obtained the vm lock, and each holds a shared lock on
the barrier. the barrier memory is not inspected after the shared lock
count reaches 0, nor after the vm lock is released.
Diffstat (limited to 'src/internal')
| -rw-r--r-- | src/internal/pthread_impl.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h index 82d62426..dd3863fc 100644 --- a/src/internal/pthread_impl.h +++ b/src/internal/pthread_impl.h @@ -77,7 +77,7 @@ struct __timer { #define _b_waiters __u.__i[1] #define _b_limit __u.__i[2] #define _b_count __u.__i[3] -#define _b_seq __u.__i[4] +#define _b_waiters2 __u.__i[4] #define _b_inst __u.__p[4] #include "pthread_arch.h" |