diff options
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/kern/kern_umtx.c | 26 | ||||
| -rw-r--r-- | sys/sys/umtxvar.h | 4 |
2 files changed, 30 insertions, 0 deletions
diff --git a/sys/kern/kern_umtx.c b/sys/kern/kern_umtx.c index ae80554cbbb8..d869d5870000 100644 --- a/sys/kern/kern_umtx.c +++ b/sys/kern/kern_umtx.c @@ -559,6 +559,32 @@ umtxq_count_pi(struct umtx_key *key, struct umtx_q **first) } /* + * Wake up threads waiting on an userland object by a bit mask. + */ +int +umtxq_signal_mask(struct umtx_key *key, int n_wake, u_int bitset) +{ + struct umtxq_queue *uh; + struct umtx_q *uq, *uq_temp; + int ret; + + ret = 0; + UMTXQ_LOCKED_ASSERT(umtxq_getchain(key)); + uh = umtxq_queue_lookup(key, UMTX_SHARED_QUEUE); + if (uh == NULL) + return (0); + TAILQ_FOREACH_SAFE(uq, &uh->head, uq_link, uq_temp) { + if ((uq->uq_bitset & bitset) == 0) + continue; + umtxq_remove_queue(uq, UMTX_SHARED_QUEUE); + wakeup_one(uq); + if (++ret >= n_wake) + break; + } + return (ret); +} + +/* * Wake up threads waiting on an userland object. */ diff --git a/sys/sys/umtxvar.h b/sys/sys/umtxvar.h index 68f261fe6abf..de1b649ed8d7 100644 --- a/sys/sys/umtxvar.h +++ b/sys/sys/umtxvar.h @@ -120,6 +120,9 @@ struct umtx_q { int uq_flags; #define UQF_UMTXQ 0x0001 + /* Futex bitset mask */ + u_int uq_bitset; + /* The thread waits on. */ struct thread *uq_thread; @@ -207,6 +210,7 @@ void umtxq_free(struct umtx_q *); struct umtxq_chain *umtxq_getchain(struct umtx_key *); void umtxq_insert_queue(struct umtx_q *, int); void umtxq_remove_queue(struct umtx_q *, int); +int umtxq_signal_mask(struct umtx_key *, int, u_int); int umtxq_sleep(struct umtx_q *, const char *, struct umtx_abs_timeout *); void umtxq_unbusy(struct umtx_key *); |