diff options
Diffstat (limited to 'erts/emulator/sys/common')
| -rw-r--r-- | erts/emulator/sys/common/erl_check_io.c | 33 |
1 files changed, 16 insertions, 17 deletions
diff --git a/erts/emulator/sys/common/erl_check_io.c b/erts/emulator/sys/common/erl_check_io.c index 15662f9a70..a5a851d122 100644 --- a/erts/emulator/sys/common/erl_check_io.c +++ b/erts/emulator/sys/common/erl_check_io.c @@ -101,11 +101,10 @@ static struct pollset_info int size; ErtsSysFdType *array; } active_fd; - struct removed_fd* removed_list; /* list of deselected fd's*/ - erts_spinlock_t removed_list_lock; + erts_atomic_t removed_list; /* struct removed_fd* */ }pollset; -#define NUM_OF_POLLSETS 1 +#define NUM_OF_POLLSETS 1 #ifdef ERTS_ENABLE_KERNEL_POLL void erts_init_check_io_kp(void); @@ -302,6 +301,7 @@ remember_removed(ErtsDrvEventState *state, struct pollset_info* psi) struct removed_fd *fdlp; ERTS_LC_ASSERT(erts_lc_mtx_is_locked(fd_mtx(state->fd))); if (erts_atomic_read_nob(&psi->in_poll_wait)) { + erts_aint_t was_next, exp_next; state->remove_cnt++; ASSERT(state->remove_cnt > 0); fdlp = removed_fd_alloc(); @@ -311,10 +311,16 @@ remember_removed(ErtsDrvEventState *state, struct pollset_info* psi) #ifndef ERTS_SYS_CONTINOUS_FD_NUMBERS fdlp->state = state; #endif - erts_spin_lock(&psi->removed_list_lock); - fdlp->next = psi->removed_list; - psi->removed_list = fdlp; - erts_spin_unlock(&psi->removed_list_lock); + + /* Lockless atomic insertion in removed_list */ + was_next = erts_atomic_read_acqb(&psi->removed_list); + do { + exp_next = was_next; + fdlp->next = (struct removed_fd*) exp_next; + was_next = erts_atomic_cmpxchg_mb(&psi->removed_list, + (erts_aint_t) fdlp, + exp_next); + }while (was_next != exp_next); } } @@ -336,12 +342,8 @@ forget_removed(struct pollset_info* psi) struct removed_fd* fdlp; struct removed_fd* tofree; - /* Fast track: if (atomic_ptr(removed_list)==NULL) return; */ - - erts_spin_lock(&psi->removed_list_lock); - fdlp = psi->removed_list; - psi->removed_list = NULL; - erts_spin_unlock(&psi->removed_list_lock); + fdlp = (struct removed_fd*) erts_atomic_xchg_mb(&psi->removed_list, + (erts_aint_t) NULL); while (fdlp) { ErtsResource* resource = NULL; @@ -2153,11 +2155,8 @@ ERTS_CIO_EXPORT(erts_init_check_io)(void) } #endif - init_removed_fd_alloc(); - pollset.removed_list = NULL; - erts_spinlock_init(&pollset.removed_list_lock, "pollset_rm_list", NIL, - ERTS_LOCK_FLAGS_PROPERTY_STATIC | ERTS_LOCK_FLAGS_CATEGORY_IO); + erts_atomic_init_nob(&pollset.removed_list, (erts_aint_t)NULL); { int i; for (i=0; i<DRV_EV_STATE_LOCK_CNT; i++) { |