diff options
Diffstat (limited to 'erts/emulator/sys/ose/erl_poll.c')
| -rw-r--r-- | erts/emulator/sys/ose/erl_poll.c | 818 |
1 files changed, 0 insertions, 818 deletions
diff --git a/erts/emulator/sys/ose/erl_poll.c b/erts/emulator/sys/ose/erl_poll.c deleted file mode 100644 index 5cee582a00..0000000000 --- a/erts/emulator/sys/ose/erl_poll.c +++ /dev/null @@ -1,818 +0,0 @@ -/* - * %CopyrightBegin% - * - * Copyright Ericsson AB 2006-2012. All Rights Reserved. - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - * - * %CopyrightEnd% - */ - -/* - * Description: Poll interface suitable for ERTS on OSE with or without - * SMP support. - * - * The interface is currently implemented using: - * - receive + receive_fsem - * - * Author: Lukas Larsson - */ - -#ifdef HAVE_CONFIG_H -# include "config.h" -#endif - -#include "erl_thr_progress.h" -#include "erl_driver.h" -#include "erl_alloc.h" -#include "erl_poll.h" - -#define NOFILE 4096 - -/* - * Some debug macros - */ - -/* #define HARDDEBUG -#define HARDTRACE*/ -#ifdef HARDDEBUG -#ifdef HARDTRACE -#define HARDTRACEF(X, ...) { fprintf(stderr, X, __VA_ARGS__); fprintf(stderr,"\r\n"); } -#else -#define HARDTRACEF(...) -#endif - -#else -#define HARDTRACEF(X,...) -#define HARDDEBUGF(...) -#endif - -#if 0 -#define ERTS_POLL_DEBUG_PRINT -#endif - -#if defined(DEBUG) && 0 -#define HARD_DEBUG -#endif - -# define SEL_ALLOC erts_alloc -# define SEL_REALLOC realloc_wrap -# define SEL_FREE erts_free - -#ifdef ERTS_SMP - -#define ERTS_POLLSET_LOCK(PS) \ - erts_smp_mtx_lock(&(PS)->mtx) -#define ERTS_POLLSET_UNLOCK(PS) \ - erts_smp_mtx_unlock(&(PS)->mtx) - -#else - -#define ERTS_POLLSET_LOCK(PS) -#define ERTS_POLLSET_UNLOCK(PS) - -#endif - -/* - * --- Data types ------------------------------------------------------------ - */ - -union SIGNAL { - SIGSELECT sig_no; -}; - -typedef struct erts_sigsel_item_ ErtsSigSelItem; - -struct erts_sigsel_item_ { - ErtsSigSelItem *next; - ErtsSysFdType fd; - ErtsPollEvents events; -}; - -typedef struct erts_sigsel_info_ ErtsSigSelInfo; - -struct erts_sigsel_info_ { - ErtsSigSelInfo *next; - SIGSELECT signo; - ErlDrvOseEventId (*decode)(union SIGNAL* sig); - ErtsSigSelItem *fds; -}; - -struct ErtsPollSet_ { - SIGSELECT *sigs; - ErtsSigSelInfo *info; - Uint sig_count; - Uint item_count; - PROCESS interrupt; - erts_atomic32_t wakeup_state; - erts_atomic64_t timeout_time; -#ifdef ERTS_SMP - erts_smp_mtx_t mtx; -#endif -}; - -static int max_fds = -1; - -static ERTS_INLINE void -init_timeout_time(ErtsPollSet ps) -{ - erts_atomic64_init_nob(&ps->timeout_time, - (erts_aint64_t) ERTS_MONOTONIC_TIME_MAX); -} - -static ERTS_INLINE void -set_timeout_time(ErtsPollSet ps, ErtsMonotonicTime time) -{ - erts_atomic64_set_relb(&ps->timeout_time, - (erts_aint64_t) time); -} - -static ERTS_INLINE ErtsMonotonicTime -get_timeout_time(ErtsPollSet ps) -{ - return (ErtsMonotonicTime) erts_atomic64_read_acqb(&ps->timeout_time); -} - -#define ERTS_POLL_NOT_WOKEN ((erts_aint32_t) (1 << 0)) -#define ERTS_POLL_WOKEN_INTR ((erts_aint32_t) (1 << 1)) -#define ERTS_POLL_WOKEN_TIMEDOUT ((erts_aint32_t) (1 << 2)) -#define ERTS_POLL_WOKEN_IO_READY ((erts_aint32_t) (1 << 3)) -#define ERTS_POLL_SLEEPING ((erts_aint32_t) (1 << 4)) - -/* signal list prototypes */ -static ErtsSigSelInfo *get_sigsel_info(ErtsPollSet ps, SIGSELECT signo); -static ErtsSigSelItem *get_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd); -static ErtsSigSelInfo *add_sigsel_info(ErtsPollSet ps, ErtsSysFdType fd, - ErlDrvOseEventId (*decode)(union SIGNAL* sig)); -static ErtsSigSelItem *add_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd, - ErlDrvOseEventId (*decode)(union SIGNAL* sig)); -static int del_sigsel_info(ErtsPollSet ps, ErtsSigSelInfo *info); -static int del_sigsel_item(ErtsPollSet ps, ErtsSigSelItem *item); -static int update_sigsel(ErtsPollSet ps); - -static ErtsSigSelInfo * -get_sigsel_info(ErtsPollSet ps, SIGSELECT signo) { - ErtsSigSelInfo *curr = ps->info; - while (curr != NULL) { - if (curr->signo == signo) - return curr; - curr = curr->next; - } - return NULL; -} - -static ErtsSigSelItem * -get_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd) { - ErtsSigSelInfo *info = get_sigsel_info(ps,fd->signo); - ErtsSigSelItem *curr; - - if (info == NULL) - return NULL; - - curr = info->fds; - - while (curr != NULL) { - if (curr->fd->id == fd->id) { - ASSERT(curr->fd->signo == fd->signo); - return curr; - } - curr = curr->next; - } - return NULL; -} - -static ErtsSigSelInfo * -add_sigsel_info(ErtsPollSet ps, ErtsSysFdType fd, - ErlDrvOseEventId (*decode)(union SIGNAL* sig)) { - ErtsSigSelInfo *info = SEL_ALLOC(ERTS_ALC_T_POLLSET, - sizeof(ErtsSigSelInfo)); - info->next = ps->info; - info->fds = NULL; - info->signo = fd->signo; - info->decode = decode; - ps->info = info; - ps->sig_count++; - return info; -} - -static ErtsSigSelItem * -add_sigsel_item(ErtsPollSet ps, ErtsSysFdType fd, - ErlDrvOseEventId (*decode)(union SIGNAL* sig)) { - ErtsSigSelInfo *info = get_sigsel_info(ps,fd->signo); - ErtsSigSelItem *item = SEL_ALLOC(ERTS_ALC_T_POLLSET, - sizeof(ErtsSigSelItem)); - if (info == NULL) - info = add_sigsel_info(ps, fd, decode); - if (info->decode != decode) { - erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); - erts_dsprintf(dsbufp, "erts_poll_control() inconsistency: multiple resolve_signal functions for same signal (%d)\n", - fd->signo); - erts_send_error_to_logger_nogl(dsbufp); - } - ASSERT(info->decode == decode); - item->next = info->fds; - item->fd = fd; - item->events = 0; - info->fds = item; - ps->item_count++; - return item; -} - -static int del_sigsel_info(ErtsPollSet ps, ErtsSigSelInfo *info) { - ErtsSigSelInfo *curr, *prev; - - if (ps->info == info) { - ps->info = ps->info->next; - } else { - curr = ps->info->next; - prev = ps->info; - - while (curr != info) { - if (curr == NULL) - return 1; - prev = curr; - curr = curr->next; - } - prev->next = curr->next; - } - - ps->sig_count--; - SEL_FREE(ERTS_ALC_T_POLLSET, info); - return 0; -} - -static int del_sigsel_item(ErtsPollSet ps, ErtsSigSelItem *item) { - ErtsSigSelInfo *info = get_sigsel_info(ps,item->fd->signo); - ErtsSigSelItem *curr, *prev; - - ps->item_count--; - ASSERT(ps->item_count >= 0); - - if (info->fds == item) { - info->fds = info->fds->next; - SEL_FREE(ERTS_ALC_T_POLLSET,item); - if (info->fds == NULL) - return del_sigsel_info(ps,info); - return 0; - } - - curr = info->fds->next; - prev = info->fds; - - while (curr != item) { - if (curr == NULL) { - /* We did not find an item to delete so we have to - * increment item count again. - */ - ps->item_count++; - return 1; - } - prev = curr; - curr = curr->next; - } - prev->next = curr->next; - SEL_FREE(ERTS_ALC_T_POLLSET,item); - return 0; -} - -#ifdef ERTS_SMP - -static void update_redir_tables(ErtsPollSet ps) { - struct OS_redir_entry *redir_table; - PROCESS sched_1 = ERTS_SCHEDULER_IX(0)->tid.id; - int i; - redir_table = SEL_ALLOC(ERTS_ALC_T_POLLSET, - sizeof(struct OS_redir_entry)*(ps->sig_count+1)); - - redir_table[0].sig = ps->sig_count+1; - redir_table[0].pid = 0; - - for (i = 1; i < ps->sig_count+1; i++) { - redir_table[i].sig = ps->sigs[i]; - redir_table[i].pid = sched_1; - } - - for (i = 1; i < erts_no_schedulers; i++) { - ErtsSchedulerData *esdp = ERTS_SCHEDULER_IX(i); - set_redirection(esdp->tid.id,redir_table); - } - - SEL_FREE(ERTS_ALC_T_POLLSET,redir_table); -} - -#endif - -static int update_sigsel(ErtsPollSet ps) { - ErtsSigSelInfo *info = ps->info; - - int i; - - if (ps->sigs != NULL) - SEL_FREE(ERTS_ALC_T_POLLSET,ps->sigs); - - if (ps->sig_count == 0) { - /* If there are no signals we place a non-valid signal to make sure that - * we do not trigger on a any unrelated signals which are sent to the - * process. - */ - ps->sigs = SEL_ALLOC(ERTS_ALC_T_POLLSET,sizeof(SIGSELECT)*(2)); - ps->sigs[0] = 1; - ps->sigs[1] = ERTS_SIGNAL_INVALID; - return 0; - } - - ps->sigs = SEL_ALLOC(ERTS_ALC_T_POLLSET,sizeof(SIGSELECT)*(ps->sig_count+1)); - ps->sigs[0] = ps->sig_count; - - for (i = 1; info != NULL; i++, info = info->next) - ps->sigs[i] = info->signo; - -#ifdef ERTS_SMP - update_redir_tables(ps); -#endif - - return 0; -} - -static ERTS_INLINE void -wake_poller(ErtsPollSet ps) -{ - erts_aint32_t wakeup_state; - - ERTS_THR_MEMORY_BARRIER; - wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state); - while (wakeup_state != ERTS_POLL_WOKEN_IO_READY - && wakeup_state != ERTS_POLL_WOKEN_INTR) { - erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_INTR, - wakeup_state); - if (act == wakeup_state) { - wakeup_state = act; - break; - } - wakeup_state = act; - } - if (wakeup_state == ERTS_POLL_SLEEPING) { - /* - * Since we don't know the internals of signal_fsem() we issue - * a memory barrier as a safety precaution ensuring that - * the store we just made to wakeup_state wont be reordered - * with loads in signal_fsem(). - */ - ERTS_THR_MEMORY_BARRIER; - signal_fsem(ps->interrupt); - } -} - -static ERTS_INLINE void -reset_interrupt(ErtsPollSet ps) -{ - /* We need to keep io-ready if set */ - erts_aint32_t wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state); - while (wakeup_state != ERTS_POLL_NOT_WOKEN && - wakeup_state != ERTS_POLL_SLEEPING) { - erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_NOT_WOKEN, - wakeup_state); - if (wakeup_state == act) - break; - wakeup_state = act; - } - ERTS_THR_MEMORY_BARRIER; -} - -static ERTS_INLINE void -set_interrupt(ErtsPollSet ps) -{ - wake_poller(ps); -} - -void erts_poll_interrupt(ErtsPollSet ps,int set) { - HARDTRACEF("erts_poll_interrupt called!\n"); - - if (!set) - reset_interrupt(ps); - else - set_interrupt(ps); - -} - -void erts_poll_interrupt_timed(ErtsPollSet ps, - int set, - ErtsTimeoutTime timeout_time) { - HARDTRACEF("erts_poll_interrupt_timed called!\n"); - - if (!set) - reset_interrupt(ps); - else if (get_timeout_time(ps) > timeout_time) - set_interrupt(ps); -} - -ErtsPollEvents erts_poll_control(ErtsPollSet ps, ErtsSysFdType fd, - ErtsPollEvents pe, int on, int* do_wake) { - ErtsSigSelItem *curr; - ErtsPollEvents new_events; - int old_sig_count; - - HARDTRACEF( - "%ux: In erts_poll_control, fd = %d, pe = %d, on = %d, *do_wake = %d, curr = 0x%xu", - ps, fd, pe, on, do_wake, curr); - - ERTS_POLLSET_LOCK(ps); - - if (on && (pe & ERTS_POLL_EV_IN) && (pe & ERTS_POLL_EV_OUT)) { - /* Check to make sure both in and out are not used at the same time */ - new_events = ERTS_POLL_EV_NVAL; - goto done; - } - - curr = get_sigsel_item(ps, fd); - old_sig_count = ps->sig_count; - - if (curr == NULL && on) { - curr = add_sigsel_item(ps, fd, fd->resolve_signal); - } else if (curr == NULL && !on) { - new_events = ERTS_POLL_EV_NVAL; - goto done; - } - - new_events = curr->events; - - if (pe == 0) { - *do_wake = 0; - goto done; - } - - if (on) { - new_events |= pe; - curr->events = new_events; - } else { - new_events &= ~pe; - curr->events = new_events; - if (new_events == 0 && del_sigsel_item(ps, curr)) { - new_events = ERTS_POLL_EV_NVAL; - goto done; - } - } - - if (ps->sig_count != old_sig_count) { - if (update_sigsel(ps)) - new_events = ERTS_POLL_EV_NVAL; - } -done: - ERTS_POLLSET_UNLOCK(ps); - HARDTRACEF("%ux: Out erts_poll_control", ps); - return new_events; -} - -int erts_poll_wait(ErtsPollSet ps, - ErtsPollResFd pr[], - int *len, - ErtsMonotonicTime timeout_time) -{ - int res = ETIMEDOUT, no_fds, currid = 0; - OSTIME timeout; - union SIGNAL *sig; - ErtsMonotonicTime current_time, diff_time, timeout; - // HARDTRACEF("%ux: In erts_poll_wait",ps); - if (ps->interrupt == (PROCESS)0) - ps->interrupt = current_process(); - - ASSERT(current_process() == ps->interrupt); - ASSERT(get_fsem(current_process()) == 0); - ASSERT(erts_atomic32_read_nob(&ps->wakeup_state) & - (ERTS_POLL_NOT_WOKEN | ERTS_POLL_WOKEN_INTR)); - /* Max no of spots avable in pr */ - no_fds = *len; - - *len = 0; - - /* erts_printf("Entering erts_poll_wait(), timeout_time=%bps\n", - timeout_time); */ - - if (timeout_time == ERTS_POLL_NO_TIMEOUT) { - no_timeout: - timeout = (OSTIME) 0; - save_timeout_time = ERTS_MONOTONIC_TIME_MIN; - } - else { - ErtsMonotonicTime current_time, diff_time; - current_time = erts_get_monotonic_time(NULL); - diff_time = timeout_time - current_time; - if (diff_time <= 0) - goto no_timeout; - diff_time = (ERTS_MONOTONIC_TO_MSEC(diff_time - 1) + 1); - if (diff_time > INT_MAX) - diff_time = INT_MAX; - timeout = (OSTIME) diff_time; - save_timeout_time = current_time; - save_timeout_time += ERTS_MSEC_TO_MONOTONIC(diff_time); - } - - set_timeout_time(ps, save_timeout_time); - - while (currid < no_fds) { - if (timeout > 0) { - erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_SLEEPING, - ERTS_POLL_NOT_WOKEN); - if (act == ERTS_POLL_NOT_WOKEN) { -#ifdef ERTS_SMP - erts_thr_progress_prepare_wait(NULL); -#endif - sig = receive_fsem(timeout, ps->sigs, 1); -#ifdef ERTS_SMP - erts_thr_progress_finalize_wait(NULL); -#endif - } else { - ASSERT(act == ERTS_POLL_WOKEN_INTR); - sig = OS_RCV_FSEM; - } - } else - sig = receive_w_tmo(0, ps->sigs); - - if (sig == NULL) { - if (timeout > 0) { - erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_TIMEDOUT, - ERTS_POLL_SLEEPING); - if (act == ERTS_POLL_WOKEN_INTR) - /* Restore fsem as it was signaled but we got a timeout */ - wait_fsem(1); - } else - erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_TIMEDOUT, - ERTS_POLL_NOT_WOKEN); - break; - } else if (sig == OS_RCV_FSEM) { - ASSERT(erts_atomic32_read_nob(&ps->wakeup_state) == ERTS_POLL_WOKEN_INTR); - break; - } - { - ErtsSigSelInfo *info = get_sigsel_info(ps, sig->sig_no); - struct erts_sys_fd_type fd = { sig->sig_no, info->decode(sig) }; - ErtsSigSelItem *item = get_sigsel_item(ps, &fd); - - ASSERT(sig); - if (currid == 0 && timeout > 0) { - erts_aint32_t act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_IO_READY, - ERTS_POLL_SLEEPING); - if (act == ERTS_POLL_WOKEN_INTR) { - /* Restore fsem as it was signaled but we got a msg */ - wait_fsem(1); - act = erts_atomic32_cmpxchg_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_IO_READY, - ERTS_POLL_WOKEN_INTR); - } - } else if (currid == 0) { - erts_atomic32_set_nob(&ps->wakeup_state, - ERTS_POLL_WOKEN_IO_READY); - } - - if (item == NULL) { - erts_dsprintf_buf_t *dsbufp = erts_create_logger_dsbuf(); - erts_dsprintf( - dsbufp, - "erts_poll_wait() failed: found unkown signal id %d (signo %u) " - "(curr_proc 0x%x)\n", - fd.id, fd.signo, current_process()); - erts_send_error_to_logger_nogl(dsbufp); - timeout = 0; - /* Under normal circumstances the signal is deallocated by the - * driver that issued the select operation. But in this case - * there's no driver waiting for such signal so we have to - * deallocate it here */ - if (sig) - free_buf(&sig); - } else { - int i; - struct erts_sys_fd_type *fd = NULL; - ErtsPollOseMsgList *tl,*new; - - /* Check if this fd has already been triggered by a previous signal */ - for (i = 0; i < currid;i++) { - if (pr[i].fd == item->fd) { - fd = pr[i].fd; - pr[i].events |= item->events; - break; - } - } - - /* First time this fd is triggered */ - if (fd == NULL) { - pr[currid].fd = item->fd; - pr[currid].events = item->events; - fd = item->fd; - timeout = 0; - currid++; - } - - /* Insert new signal in approriate list */ - new = erts_alloc(ERTS_ALC_T_FD_SIG_LIST,sizeof(ErtsPollOseMsgList)); - new->next = NULL; - new->data = sig; - - ethr_mutex_lock(&fd->mtx); - tl = fd->msgs; - - if (tl == NULL) { - fd->msgs = new; - } else { - while (tl->next != NULL) - tl = tl->next; - tl->next = new; - } - ethr_mutex_unlock(&fd->mtx); - } - - } - } - - { - erts_aint32_t wakeup_state = erts_atomic32_read_nob(&ps->wakeup_state); - - switch (wakeup_state) { - case ERTS_POLL_WOKEN_IO_READY: - res = 0; - break; - case ERTS_POLL_WOKEN_INTR: - res = EINTR; - break; - case ERTS_POLL_WOKEN_TIMEDOUT: - res = ETIMEDOUT; - break; - case ERTS_POLL_NOT_WOKEN: - /* This happens when we get an invalid signal only */ - res = EINVAL; - break; - default: - res = 0; - erl_exit(ERTS_ABORT_EXIT, - "%s:%d: Internal error: Invalid wakeup_state=%d\n", - __FILE__, __LINE__, (int) wakeup_state); - } - } - - erts_atomic32_set_nob(&ps->wakeup_state, ERTS_POLL_NOT_WOKEN); - set_timeout_time(ps, ERTS_MONOTONIC_TIME_MAX); - - *len = currid; - - // HARDTRACEF("%ux: Out erts_poll_wait",ps); - return res; -} - -int erts_poll_max_fds(void) -{ - - HARDTRACEF("In/Out erts_poll_max_fds -> %d",max_fds); - return max_fds; -} - -void erts_poll_info(ErtsPollSet ps, - ErtsPollInfo *pip) -{ - Uint size = 0; - Uint num_events = 0; - - size += sizeof(struct ErtsPollSet_); - size += sizeof(ErtsSigSelInfo)*ps->sig_count; - size += sizeof(ErtsSigSelItem)*ps->item_count; - size += sizeof(SIGSELECT)*(ps->sig_count+1); - - pip->primary = "receive_fsem"; - - pip->fallback = NULL; - - pip->kernel_poll = NULL; - - pip->memory_size = size; - - pip->poll_set_size = num_events; - - pip->fallback_poll_set_size = 0; - - pip->lazy_updates = 0; - - pip->pending_updates = 0; - - pip->batch_updates = 0; - - pip->concurrent_updates = 0; - - - pip->max_fds = erts_poll_max_fds(); - HARDTRACEF("%ux: Out erts_poll_info",ps); - -} - -ErtsPollSet erts_poll_create_pollset(void) -{ - ErtsPollSet ps = SEL_ALLOC(ERTS_ALC_T_POLLSET, - sizeof(struct ErtsPollSet_)); - - ps->sigs = NULL; - ps->sig_count = 0; - ps->item_count = 0; - ps->info = NULL; - ps->interrupt = (PROCESS)0; - erts_atomic32_init_nob(&ps->wakeup_state, ERTS_POLL_NOT_WOKEN); - init_timeout_time(ps); -#ifdef ERTS_SMP - erts_smp_mtx_init(&ps->mtx, "pollset"); -#endif - update_sigsel(ps); - HARDTRACEF("%ux: Out erts_poll_create_pollset",ps); - return ps; -} - -void erts_poll_destroy_pollset(ErtsPollSet ps) -{ - ErtsSigSelInfo *info; - for (info = ps->info; ps->info != NULL; info = ps->info, ps->info = ps->info->next) { - ErtsSigSelItem *item; - for (item = info->fds; info->fds != NULL; item = info->fds, info->fds = info->fds->next) - SEL_FREE(ERTS_ALC_T_POLLSET, item); - SEL_FREE(ERTS_ALC_T_POLLSET, info); - } - - SEL_FREE(ERTS_ALC_T_POLLSET,ps->sigs); - -#ifdef ERTS_SMP - erts_smp_mtx_destroy(&ps->mtx); -#endif - - SEL_FREE(ERTS_ALC_T_POLLSET,ps); -} - -void erts_poll_init(void) -{ - HARDTRACEF("In %s", __FUNCTION__); - max_fds = 256; - - HARDTRACEF("Out %s", __FUNCTION__); -} - - -/* OSE driver functions */ - -union SIGNAL *erl_drv_ose_get_signal(ErlDrvEvent drv_ev) { - struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev; - ethr_mutex_lock(&ev->mtx); - if (ev->msgs == NULL) { - ethr_mutex_unlock(&ev->mtx); - return NULL; - } else { - ErtsPollOseMsgList *msg = ev->msgs; - union SIGNAL *sig = (union SIGNAL*)msg->data; - ASSERT(msg->data); - ev->msgs = msg->next; - ethr_mutex_unlock(&ev->mtx); - erts_free(ERTS_ALC_T_FD_SIG_LIST,msg); - restore(sig); - return sig; - } -} - -ErlDrvEvent -erl_drv_ose_event_alloc(SIGSELECT signo, ErlDrvOseEventId id, - ErlDrvOseEventId (*resolve_signal)(union SIGNAL *sig), void *extra) { - struct erts_sys_fd_type *ev = erts_alloc(ERTS_ALC_T_DRV_EV, - sizeof(struct erts_sys_fd_type)); - ev->signo = signo; - ev->extra = extra; - ev->id = id; - ev->msgs = NULL; - ev->resolve_signal = resolve_signal; - ethr_mutex_init(&ev->mtx); - return (ErlDrvEvent)ev; -} - -void erl_drv_ose_event_free(ErlDrvEvent drv_ev) { - struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev; - ASSERT(ev->msgs == NULL); - ethr_mutex_destroy(&ev->mtx); - erts_free(ERTS_ALC_T_DRV_EV,ev); -} - -void erl_drv_ose_event_fetch(ErlDrvEvent drv_ev, SIGSELECT *signo, - ErlDrvOseEventId *id, void **extra) { - struct erts_sys_fd_type *ev = (struct erts_sys_fd_type *)drv_ev; - if (signo) - *signo = ev->signo; - if (extra) - *extra = ev->extra; - if (id) - *id = ev->id; -} |