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| author | Carlos O'Donell <carlos@systemhalted.org> | 2015-01-21 00:46:16 -0500 |
|---|---|---|
| committer | Carlos O'Donell <carlos@systemhalted.org> | 2015-01-21 00:46:16 -0500 |
| commit | 042e1521c794a945edc43b5bfa7e69ad70420524 (patch) | |
| tree | 74f44d4b065d801cfe6ace654827ca8ef351bff8 /sysdeps/unix/sysv/linux/alpha | |
| parent | a8db092ec0c6742a9d41e1715946e90d4edfeec1 (diff) | |
| download | glibc-042e1521c794a945edc43b5bfa7e69ad70420524.tar.gz | |
Fix semaphore destruction (bug 12674).
This commit fixes semaphore destruction by either using 64b atomic
operations (where available), or by using two separate fields when only
32b atomic operations are available. In the latter case, we keep a
conservative estimate of whether there are any waiting threads in one
bit of the field that counts the number of available tokens, thus
allowing sem_post to atomically both add a token and determine whether
it needs to call futex_wake.
See:
https://sourceware.org/ml/libc-alpha/2014-12/msg00155.html
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha')
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/sem_post.c | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/sysdeps/unix/sysv/linux/alpha/sem_post.c b/sysdeps/unix/sysv/linux/alpha/sem_post.c deleted file mode 100644 index 9d4495312e..0000000000 --- a/sysdeps/unix/sysv/linux/alpha/sem_post.c +++ /dev/null @@ -1,5 +0,0 @@ -/* ??? This is an ass-backwards way to do this. We should simply define - the acquire/release semantics of atomic_exchange_and_add. And even if - we don't do this, we should be using atomic_full_barrier or otherwise. */ -#define __lll_rel_instr "mb" -#include <nptl/sem_post.c> |