diff options
Diffstat (limited to 'source4/lib/events')
| -rw-r--r-- | source4/lib/events/config.m4 | 19 | ||||
| -rw-r--r-- | source4/lib/events/config.mk | 26 | ||||
| -rw-r--r-- | source4/lib/events/events.c | 98 | ||||
| -rw-r--r-- | source4/lib/events/events.h | 13 | ||||
| -rw-r--r-- | source4/lib/events/events_aio.c | 259 | ||||
| -rw-r--r-- | source4/lib/events/events_epoll.c | 407 | ||||
| -rw-r--r-- | source4/lib/events/events_internal.h | 23 | ||||
| -rw-r--r-- | source4/lib/events/events_select.c | 289 | ||||
| -rw-r--r-- | source4/lib/events/events_standard.c | 132 | ||||
| -rw-r--r-- | source4/lib/events/events_timed.c | 136 |
10 files changed, 1137 insertions, 265 deletions
diff --git a/source4/lib/events/config.m4 b/source4/lib/events/config.m4 index 6e4095d5b8..8c61f7ed42 100644 --- a/source4/lib/events/config.m4 +++ b/source4/lib/events/config.m4 @@ -1,2 +1,19 @@ AC_CHECK_HEADERS(sys/epoll.h) -AC_CHECK_FUNCS(epoll_create) + +# check for native Linux AIO interface +SMB_ENABLE(EVENTS_AIO, NO) +AC_CHECK_HEADERS(libaio.h) +AC_CHECK_LIB_EXT(aio, AIO_LIBS, io_getevents) +if test x"$ac_cv_header_libaio_h" = x"yes" -a x"$ac_cv_lib_ext_aio_io_getevents" = x"yes";then + SMB_ENABLE(EVENTS_AIO,YES) + AC_DEFINE(HAVE_LINUX_AIO, 1, [Whether Linux AIO is available]) +fi +SMB_EXT_LIB(LIBAIO_LINUX, $AIO_LIBS) + +# check for native Linux AIO interface +SMB_ENABLE(EVENTS_EPOLL, NO) +AC_CHECK_HEADERS(sys/epoll.h) +if test x"$ac_cv_header_sys_epoll_h" = x"yes";then + SMB_ENABLE(EVENTS_EPOLL,YES) +fi + diff --git a/source4/lib/events/config.mk b/source4/lib/events/config.mk index 5f770b971b..5e871cb0ac 100644 --- a/source4/lib/events/config.mk +++ b/source4/lib/events/config.mk @@ -1,7 +1,29 @@ ############################## +[MODULE::EVENTS_EPOLL] +OBJ_FILES = events_epoll.o +SUBSYSTEM = LIBEVENTS +INIT_FUNCTION = events_epoll_init +############################## + +############################## +[MODULE::EVENTS_SELECT] +OBJ_FILES = events_select.o +SUBSYSTEM = LIBEVENTS +INIT_FUNCTION = events_select_init +############################## + +############################## +[MODULE::EVENTS_STANDARD] +OBJ_FILES = events_standard.o +SUBSYSTEM = LIBEVENTS +INIT_FUNCTION = events_standard_init +############################## + + +############################## # Start SUBSYSTEM LIBEVENTS [SUBSYSTEM::LIBEVENTS] -OBJ_FILES = events.o events_standard.o -PUBLIC_DEPENDENCIES = LIBTALLOC +OBJ_FILES = events.o events_timed.o +PUBLIC_DEPENDENCIES = LIBTALLOC EVENTS_STANDARD EVENTS_EPOLL # End SUBSYSTEM LIBEVENTS ############################## diff --git a/source4/lib/events/events.c b/source4/lib/events/events.c index 585fcb3112..52b431befa 100644 --- a/source4/lib/events/events.c +++ b/source4/lib/events/events.c @@ -57,6 +57,63 @@ #include "includes.h" #include "lib/events/events.h" #include "lib/events/events_internal.h" +#include "lib/util/dlinklist.h" +#include "build.h" + +struct event_ops_list { + struct event_ops_list *next, *prev; + const char *name; + const struct event_ops *ops; +}; + +/* list of registered event backends */ +static struct event_ops_list *event_backends; + +/* + register an events backend +*/ +NTSTATUS event_register_backend(const char *name, const struct event_ops *ops) +{ + struct event_ops_list *e; + e = talloc(talloc_autofree_context(), struct event_ops_list); + NT_STATUS_HAVE_NO_MEMORY(e); + e->name = name; + e->ops = ops; + DLIST_ADD(event_backends, e); + return NT_STATUS_OK; +} + +/* + initialise backends if not already done +*/ +static void event_backend_init(void) +{ + init_module_fn static_init[] = STATIC_LIBEVENTS_MODULES; + init_module_fn *shared_init; + if (event_backends) return; + shared_init = load_samba_modules(NULL, "LIBEVENTS"); + run_init_functions(static_init); + run_init_functions(shared_init); +} + +/* + list available backends +*/ +const char **event_backend_list(TALLOC_CTX *mem_ctx) +{ + const char **list = NULL; + struct event_ops_list *e; + + event_backend_init(); + + for (e=event_backends;e;e=e->next) { + list = str_list_add(list, e->name); + } + + talloc_steal(mem_ctx, list); + + return list; +} /* create a event_context structure for a specific implemementation. @@ -69,7 +126,8 @@ NOTE: use event_context_init() inside of samba! */ -struct event_context *event_context_init_ops(TALLOC_CTX *mem_ctx, const struct event_ops *ops, void *private_data) +static struct event_context *event_context_init_ops(TALLOC_CTX *mem_ctx, + const struct event_ops *ops) { struct event_context *ev; int ret; @@ -79,7 +137,7 @@ struct event_context *event_context_init_ops(TALLOC_CTX *mem_ctx, const struct e ev->ops = ops; - ret = ev->ops->context_init(ev, private_data); + ret = ev->ops->context_init(ev); if (ret != 0) { talloc_free(ev); return NULL; @@ -93,10 +151,29 @@ struct event_context *event_context_init_ops(TALLOC_CTX *mem_ctx, const struct e call, and all subsequent calls pass this event_context as the first element. Event handlers also receive this as their first argument. */ +struct event_context *event_context_init_byname(TALLOC_CTX *mem_ctx, const char *name) +{ + struct event_ops_list *e; + + event_backend_init(); + + for (e=event_backends;e;e=e->next) { + if (strcmp(name, e->name) == 0) { + return event_context_init_ops(mem_ctx, e->ops); + } + } + return NULL; +} + + +/* + create a event_context structure. This must be the first events + call, and all subsequent calls pass this event_context as the first + element. Event handlers also receive this as their first argument. +*/ struct event_context *event_context_init(TALLOC_CTX *mem_ctx) { - const struct event_ops *ops = event_standard_get_ops(); - return event_context_init_ops(mem_ctx, ops, NULL); + return event_context_init_byname(mem_ctx, "standard"); } /* @@ -111,6 +188,19 @@ struct fd_event *event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx, } /* + add a disk aio event +*/ +struct aio_event *event_add_aio(struct event_context *ev, + TALLOC_CTX *mem_ctx, + struct iocb *iocb, + event_aio_handler_t handler, + void *private_data) +{ + if (ev->ops->add_aio == NULL) return NULL; + return ev->ops->add_aio(ev, mem_ctx, iocb, handler, private_data); +} + +/* return the fd event flags */ uint16_t event_get_fd_flags(struct fd_event *fde) diff --git a/source4/lib/events/events.h b/source4/lib/events/events.h index 8c1b7cda21..62f1d8e9df 100644 --- a/source4/lib/events/events.h +++ b/source4/lib/events/events.h @@ -27,15 +27,19 @@ struct event_context; struct event_ops; struct fd_event; struct timed_event; +struct aio_event; /* event handler types */ typedef void (*event_fd_handler_t)(struct event_context *, struct fd_event *, uint16_t , void *); typedef void (*event_timed_handler_t)(struct event_context *, struct timed_event *, struct timeval , void *); +typedef void (*event_aio_handler_t)(struct event_context *, struct aio_event *, + int , void *); struct event_context *event_context_init(TALLOC_CTX *mem_ctx); -struct event_context *event_context_init_ops(TALLOC_CTX *mem_ctx, const struct event_ops *ops, void *private_data); +struct event_context *event_context_init_byname(TALLOC_CTX *mem_ctx, const char *name); +const char **event_backend_list(TALLOC_CTX *mem_ctx); struct fd_event *event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx, int fd, uint16_t flags, event_fd_handler_t handler, @@ -46,6 +50,13 @@ struct timed_event *event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ct event_timed_handler_t handler, void *private); +struct iocb; +struct aio_event *event_add_aio(struct event_context *ev, + TALLOC_CTX *mem_ctx, + struct iocb *iocb, + event_aio_handler_t handler, + void *private); + int event_loop_once(struct event_context *ev); int event_loop_wait(struct event_context *ev); diff --git a/source4/lib/events/events_aio.c b/source4/lib/events/events_aio.c index 97305fdeb3..1c2735c200 100644 --- a/source4/lib/events/events_aio.c +++ b/source4/lib/events/events_aio.c @@ -39,8 +39,10 @@ #include "lib/events/events_internal.h" #include <libaio.h> -#define MAX_AIO_QUEUE_DEPTH 10 +#define MAX_AIO_QUEUE_DEPTH 100 +#ifndef IOCB_CMD_EPOLL_WAIT #define IOCB_CMD_EPOLL_WAIT 9 +#endif struct aio_event_context { /* a pointer back to the generic event_context */ @@ -49,22 +51,24 @@ struct aio_event_context { /* number of registered fd event handlers */ int num_fd_events; - /* list of timed events */ - struct timed_event *timed_events; - uint32_t destruction_count; io_context_t ioctx; - struct io_event events[MAX_AIO_QUEUE_DEPTH]; - struct epoll_event epevent; + struct epoll_event epevent[MAX_AIO_QUEUE_DEPTH]; struct iocb *epoll_iocb; int epoll_fd; + int is_epoll_set; }; -static void aio_event_loop_timer(struct aio_event_context *aio_ev); +struct aio_event { + struct event_context *event_ctx; + struct iocb iocb; + void *private_data; + event_aio_handler_t handler; +}; /* map from EVENT_FD_* to EPOLLIN/EPOLLOUT @@ -82,6 +86,7 @@ static uint32_t epoll_map_flags(uint16_t flags) */ static int aio_ctx_destructor(struct aio_event_context *aio_ev) { + io_queue_release(aio_ev->ioctx); close(aio_ev->epoll_fd); aio_ev->epoll_fd = -1; return 0; @@ -187,20 +192,24 @@ static void epoll_change_event(struct aio_event_context *aio_ev, struct fd_event static int setup_epoll_wait(struct aio_event_context *aio_ev) { - struct io_event r; - + if (aio_ev->is_epoll_set) { + return 0; + } memset(aio_ev->epoll_iocb, 0, sizeof(*aio_ev->epoll_iocb)); aio_ev->epoll_iocb->aio_fildes = aio_ev->epoll_fd; aio_ev->epoll_iocb->aio_lio_opcode = IOCB_CMD_EPOLL_WAIT; aio_ev->epoll_iocb->aio_reqprio = 0; - aio_ev->epoll_iocb->u.c.nbytes = 1; + aio_ev->epoll_iocb->u.c.nbytes = MAX_AIO_QUEUE_DEPTH; aio_ev->epoll_iocb->u.c.offset = -1; - aio_ev->epoll_iocb->u.c.buf = &aio_ev->epevent; + aio_ev->epoll_iocb->u.c.buf = aio_ev->epevent; + aio_ev->is_epoll_set = 1; if (io_submit(aio_ev->ioctx, 1, &aio_ev->epoll_iocb) != 1) { return -1; } + + return 0; } @@ -212,6 +221,7 @@ static int aio_event_loop(struct aio_event_context *aio_ev, struct timeval *tval int ret, i; uint32_t destruction_count = aio_ev->destruction_count; struct timespec timeout; + struct io_event events[8]; if (aio_ev->epoll_fd == -1) return -1; @@ -221,50 +231,74 @@ static int aio_event_loop(struct aio_event_context *aio_ev, struct timeval *tval timeout.tv_nsec *= 1000; } - setup_epoll_wait(aio_ev); + if (setup_epoll_wait(aio_ev) < 0) + return -1; - ret = io_getevents(aio_ev->ioctx, 1, MAX_AIO_QUEUE_DEPTH, - aio_ev->events, tvalp?&timeout:NULL); + ret = io_getevents(aio_ev->ioctx, 1, 8, + events, tvalp?&timeout:NULL); if (ret == -EINTR) { return 0; } if (ret == 0 && tvalp) { - aio_event_loop_timer(aio_ev); + common_event_loop_timer(aio_ev->ev); return 0; } for (i=0;i<ret;i++) { - struct iocb *finished = aio_ev->events[i].obj; + struct io_event *event = &events[i]; + struct iocb *finished = event->obj; + switch (finished->aio_lio_opcode) { + case IO_CMD_PWRITE: + case IO_CMD_PREAD: { + struct aio_event *ae = talloc_get_type(finished->data, + struct aio_event); + if (ae) { + talloc_set_destructor(ae, NULL); + ae->handler(ae->event_ctx, ae, + event->res, ae->private_data); + talloc_free(ae); + } + break; + } case IOCB_CMD_EPOLL_WAIT: { struct epoll_event *ep = (struct epoll_event *)finished->u.c.buf; - struct fd_event *fde = talloc_get_type(ep->data.ptr, - struct fd_event); + struct fd_event *fde; uint16_t flags = 0; + int j; - if (fde == NULL) { - return -1; - } - if (ep->events & (EPOLLHUP|EPOLLERR)) { - fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR; - if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR)) { - epoll_del_event(aio_ev, fde); - continue; +// DEBUG(0,("EVENT finished=%p fde=%p ep=%p\n", finished, fde, ep)); + //printf("GOT %d aio epoll events\n", event->res); + + aio_ev->is_epoll_set = 0; + + for (j=0; j<event->res; j++, ep++) { + fde = talloc_get_type(ep->data.ptr, + struct fd_event); + if (fde == NULL) { + return -1; } - flags |= EVENT_FD_READ; - } - if (ep->events & EPOLLIN) flags |= EVENT_FD_READ; - if (ep->events & EPOLLOUT) flags |= EVENT_FD_WRITE; - if (flags) { - fde->handler(aio_ev->ev, fde, flags, fde->private_data); - if (destruction_count != aio_ev->destruction_count) { - return 0; + if (ep->events & (EPOLLHUP|EPOLLERR)) { + fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR; + if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR)) { + epoll_del_event(aio_ev, fde); + continue; + } + flags |= EVENT_FD_READ; + } + if (ep->events & EPOLLIN) flags |= EVENT_FD_READ; + if (ep->events & EPOLLOUT) flags |= EVENT_FD_WRITE; + if (flags) { + fde->handler(aio_ev->ev, fde, flags, fde->private_data); } } break; } } + if (destruction_count != aio_ev->destruction_count) { + return 0; + } } return 0; @@ -273,7 +307,7 @@ static int aio_event_loop(struct aio_event_context *aio_ev, struct timeval *tval /* create a aio_event_context structure. */ -static int aio_event_context_init(struct event_context *ev, void *private_data) +static int aio_event_context_init(struct event_context *ev) { struct aio_event_context *aio_ev; @@ -373,93 +407,6 @@ static void aio_event_set_fd_flags(struct fd_event *fde, uint16_t flags) } /* - destroy a timed event -*/ -static int aio_event_timed_destructor(struct timed_event *te) -{ - struct aio_event_context *aio_ev = talloc_get_type(te->event_ctx->additional_data, - struct aio_event_context); - DLIST_REMOVE(aio_ev->timed_events, te); - return 0; -} - -static int aio_event_timed_deny_destructor(struct timed_event *te) -{ - return -1; -} - -/* - add a timed event - return NULL on failure (memory allocation error) -*/ -static struct timed_event *aio_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx, - struct timeval next_event, - event_timed_handler_t handler, - void *private_data) -{ - struct aio_event_context *aio_ev = talloc_get_type(ev->additional_data, - struct aio_event_context); - struct timed_event *te, *last_te, *cur_te; - - te = talloc(mem_ctx?mem_ctx:ev, struct timed_event); - if (te == NULL) return NULL; - - te->event_ctx = ev; - te->next_event = next_event; - te->handler = handler; - te->private_data = private_data; - te->additional_data = NULL; - - /* keep the list ordered */ - last_te = NULL; - for (cur_te = aio_ev->timed_events; cur_te; cur_te = cur_te->next) { - /* if the new event comes before the current one break */ - if (!timeval_is_zero(&cur_te->next_event) && - timeval_compare(&te->next_event, - &cur_te->next_event) < 0) { - break; - } - - last_te = cur_te; - } - - DLIST_ADD_AFTER(aio_ev->timed_events, te, last_te); - - talloc_set_destructor(te, aio_event_timed_destructor); - - return te; -} - -/* - a timer has gone off - call it -*/ -static void aio_event_loop_timer(struct aio_event_context *aio_ev) -{ - struct timeval t = timeval_current(); - struct timed_event *te = aio_ev->timed_events; - - if (te == NULL) { - return; - } - - /* deny the handler to free the event */ - talloc_set_destructor(te, aio_event_timed_deny_destructor); - - /* We need to remove the timer from the list before calling the - * handler because in a semi-async inner event loop called from the - * handler we don't want to come across this event again -- vl */ - DLIST_REMOVE(aio_ev->timed_events, te); - - te->handler(aio_ev->ev, te, t, te->private_data); - - /* The destructor isn't necessary anymore, we've already removed the - * event from the list. */ - talloc_set_destructor(te, NULL); - - talloc_free(te); -} - -/* do a single event loop using the events defined in ev */ static int aio_event_loop_once(struct event_context *ev) @@ -468,19 +415,11 @@ static int aio_event_loop_once(struct event_context *ev) struct aio_event_context); struct timeval tval; - /* work out the right timeout for all timed events */ - if (aio_ev->timed_events) { - struct timeval t = timeval_current(); - tval = timeval_until(&t, &aio_ev->timed_events->next_event); - if (timeval_is_zero(&tval)) { - aio_event_loop_timer(aio_ev); - return 0; - } - } else { - /* have a default tick time of 30 seconds. This guarantees - that code that uses its own timeout checking will be - able to proceeed eventually */ - tval = timeval_set(30, 0); + tval = common_event_loop_delay(ev); + + if (timeval_is_zero(&tval)) { + common_event_loop_timer(ev); + return 0; } return aio_event_loop(aio_ev, &tval); @@ -502,17 +441,61 @@ static int aio_event_loop_wait(struct event_context *ev) return 0; } +/* + called when a disk IO event needs to be cancelled +*/ +static int aio_destructor(struct aio_event *ae) +{ + struct event_context *ev = ae->event_ctx; + struct aio_event_context *aio_ev = talloc_get_type(ev->additional_data, + struct aio_event_context); + struct io_event result; + io_cancel(aio_ev->ioctx, &ae->iocb, &result); + /* TODO: handle errors from io_cancel()! */ + return 0; +} + +/* submit an aio disk IO event */ +static struct aio_event *aio_event_add_aio(struct event_context *ev, + TALLOC_CTX *mem_ctx, + struct iocb *iocb, + event_aio_handler_t handler, + void *private_data) +{ + struct aio_event_context *aio_ev = talloc_get_type(ev->additional_data, + struct aio_event_context); + struct iocb *iocbp; + struct aio_event *ae = talloc(mem_ctx?mem_ctx:ev, struct aio_event); + if (ae == NULL) return NULL; + + ae->event_ctx = ev; + ae->iocb = *iocb; + ae->handler = handler; + ae->private_data = private_data; + iocbp = &ae->iocb; + + if (io_submit(aio_ev->ioctx, 1, &iocbp) != 1) { + talloc_free(ae); + return NULL; + } + ae->iocb.data = ae; + talloc_set_destructor(ae, aio_destructor); + + return ae; +} + static const struct event_ops aio_event_ops = { .context_init = aio_event_context_init, .add_fd = aio_event_add_fd, + .add_aio = aio_event_add_aio, .get_fd_flags = aio_event_get_fd_flags, .set_fd_flags = aio_event_set_fd_flags, - .add_timed = aio_event_add_timed, + .add_timed = common_event_add_timed, .loop_once = aio_event_loop_once, .loop_wait = aio_event_loop_wait, }; -const struct event_ops *event_aio_get_ops(void) +NTSTATUS events_aio_init(void) { - return &aio_event_ops; + return event_register_backend("aio", &aio_event_ops); } diff --git a/source4/lib/events/events_epoll.c b/source4/lib/events/events_epoll.c new file mode 100644 index 0000000000..cd894d8dff --- /dev/null +++ b/source4/lib/events/events_epoll.c @@ -0,0 +1,407 @@ +/* + Unix SMB/CIFS implementation. + + main select loop and event handling - epoll implementation + + Copyright (C) Andrew Tridgell 2003-2005 + Copyright (C) Stefan Metzmacher 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "system/filesys.h" +#include "system/select.h" /* needed for WITH_EPOLL */ +#include "lib/util/dlinklist.h" +#include "lib/events/events.h" +#include "lib/events/events_internal.h" + +struct epoll_event_context { + /* a pointer back to the generic event_context */ + struct event_context *ev; + + /* number of registered fd event handlers */ + int num_fd_events; + + /* this is changed by the destructors for the fd event + type. It is used to detect event destruction by event + handlers, which means the code that is calling the event + handler needs to assume that the linked list is no longer + valid + */ + uint32_t destruction_count; + + /* when using epoll this is the handle from epoll_create */ + int epoll_fd; +}; + +/* + called when a epoll call fails, and we should fallback + to using select +*/ +static void epoll_fallback_to_select(struct epoll_event_context *epoll_ev, const char *reason) +{ + DEBUG(0,("%s (%s) - falling back to select()\n", reason, strerror(errno))); + close(epoll_ev->epoll_fd); + epoll_ev->epoll_fd = -1; + talloc_set_destructor(epoll_ev, NULL); +} + +/* + map from EVENT_FD_* to EPOLLIN/EPOLLOUT +*/ +static uint32_t epoll_map_flags(uint16_t flags) +{ + uint32_t ret = 0; + if (flags & EVENT_FD_READ) ret |= (EPOLLIN | EPOLLERR | EPOLLHUP); + if (flags & EVENT_FD_WRITE) ret |= (EPOLLOUT | EPOLLERR | EPOLLHUP); + return ret; +} + +/* + free the epoll fd +*/ +static int epoll_ctx_destructor(struct epoll_event_context *epoll_ev) +{ + close(epoll_ev->epoll_fd); + epoll_ev->epoll_fd = -1; + return 0; +} + +/* + init the epoll fd +*/ +static void epoll_init_ctx(struct epoll_event_context *epoll_ev) +{ + epoll_ev->epoll_fd = epoll_create(64); + talloc_set_destructor(epoll_ev, epoll_ctx_destructor); +} + +#define EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT (1<<0) +#define EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR (1<<1) +#define EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR (1<<2) + +/* + add the epoll event to the given fd_event +*/ +static void epoll_add_event(struct epoll_event_context *epoll_ev, struct fd_event *fde) +{ + struct epoll_event event; + if (epoll_ev->epoll_fd == -1) return; + + fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + + /* if we don't want events yet, don't add an epoll_event */ + if (fde->flags == 0) return; + + ZERO_STRUCT(event); + event.events = epoll_map_flags(fde->flags); + event.data.ptr = fde; + if (epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_ADD, fde->fd, &event) != 0) { + epoll_fallback_to_select(epoll_ev, "EPOLL_CTL_ADD failed"); + } + fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT; + + /* only if we want to read we want to tell the event handler about errors */ + if (fde->flags & EVENT_FD_READ) { + fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + } +} + +/* + delete the epoll event for given fd_event +*/ +static void epoll_del_event(struct epoll_event_context *epoll_ev, struct fd_event *fde) +{ + struct epoll_event event; + if (epoll_ev->epoll_fd == -1) return; + + fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + + /* if there's no epoll_event, we don't need to delete it */ + if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT)) return; + + ZERO_STRUCT(event); + event.events = epoll_map_flags(fde->flags); + event.data.ptr = fde; + epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_DEL, fde->fd, &event); + fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT; +} + +/* + change the epoll event to the given fd_event +*/ +static void epoll_mod_event(struct epoll_event_context *epoll_ev, struct fd_event *fde) +{ + struct epoll_event event; + if (epoll_ev->epoll_fd == -1) return; + + fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + + ZERO_STRUCT(event); + event.events = epoll_map_flags(fde->flags); + event.data.ptr = fde; + if (epoll_ctl(epoll_ev->epoll_fd, EPOLL_CTL_MOD, fde->fd, &event) != 0) { + epoll_fallback_to_select(epoll_ev, "EPOLL_CTL_MOD failed"); + } + + /* only if we want to read we want to tell the event handler about errors */ + if (fde->flags & EVENT_FD_READ) { + fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + } +} + +static void epoll_change_event(struct epoll_event_context *epoll_ev, struct fd_event *fde) +{ + BOOL got_error = (fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR); + BOOL want_read = (fde->flags & EVENT_FD_READ); + BOOL want_write= (fde->flags & EVENT_FD_WRITE); + + if (epoll_ev->epoll_fd == -1) return; + + fde->additional_flags &= ~EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR; + + /* there's already an event */ + if (fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_HAS_EVENT) { + if (want_read || (want_write && !got_error)) { + epoll_mod_event(epoll_ev, fde); + return; + } + /* + * if we want to match the select behavior, we need to remove the epoll_event + * when the caller isn't interested in events. + * + * this is because epoll reports EPOLLERR and EPOLLHUP, even without asking for them + */ + epoll_del_event(epoll_ev, fde); + return; + } + + /* there's no epoll_event attached to the fde */ + if (want_read || (want_write && !got_error)) { + epoll_add_event(epoll_ev, fde); + return; + } +} + +/* + event loop handling using epoll +*/ +static int epoll_event_loop(struct epoll_event_context *epoll_ev, struct timeval *tvalp) +{ + int ret, i; +#define MAXEVENTS 8 + struct epoll_event events[MAXEVENTS]; + uint32_t destruction_count = epoll_ev->destruction_count; + int timeout = -1; + + if (epoll_ev->epoll_fd == -1) return -1; + + if (tvalp) { + /* it's better to trigger timed events a bit later than to early */ + timeout = ((tvalp->tv_usec+999) / 1000) + (tvalp->tv_sec*1000); + } + + ret = epoll_wait(epoll_ev->epoll_fd, events, MAXEVENTS, timeout); + + if (ret == -1 && errno != EINTR) { + epoll_fallback_to_select(epoll_ev, "epoll_wait() failed"); + return -1; + } + + if (ret == 0 && tvalp) { + common_event_loop_timer(epoll_ev->ev); + return 0; + } + + for (i=0;i<ret;i++) { + struct fd_event *fde = talloc_get_type(events[i].data.ptr, + struct fd_event); + uint16_t flags = 0; + + if (fde == NULL) { + epoll_fallback_to_select(epoll_ev, "epoll_wait() gave bad data"); + return -1; + } + if (events[i].events & (EPOLLHUP|EPOLLERR)) { + fde->additional_flags |= EPOLL_ADDITIONAL_FD_FLAG_GOT_ERROR; + /* + * if we only wait for EVENT_FD_WRITE, we should not tell the + * event handler about it, and remove the epoll_event, + * as we only report errors when waiting for read events, + * to match the select() behavior + */ + if (!(fde->additional_flags & EPOLL_ADDITIONAL_FD_FLAG_REPORT_ERROR)) { + epoll_del_event(epoll_ev, fde); + continue; + } + flags |= EVENT_FD_READ; + } + if (events[i].events & EPOLLIN) flags |= EVENT_FD_READ; + if (events[i].events & EPOLLOUT) flags |= EVENT_FD_WRITE; + if (flags) { + fde->handler(epoll_ev->ev, fde, flags, fde->private_data); + if (destruction_count != epoll_ev->destruction_count) { + break; + } + } + } + + return 0; +} + +/* + create a epoll_event_context structure. +*/ +static int epoll_event_context_init(struct event_context *ev) +{ + struct epoll_event_context *epoll_ev; + + epoll_ev = talloc_zero(ev, struct epoll_event_context); + if (!epoll_ev) return -1; + epoll_ev->ev = ev; + epoll_ev->epoll_fd = -1; + + epoll_init_ctx(epoll_ev); + + ev->additional_data = epoll_ev; + return 0; +} + +/* + destroy an fd_event +*/ +static int epoll_event_fd_destructor(struct fd_event *fde) +{ + struct event_context *ev = fde->event_ctx; + struct epoll_event_context *epoll_ev = talloc_get_type(ev->additional_data, + struct epoll_event_context); + + epoll_ev->num_fd_events--; + epoll_ev->destruction_count++; + + epoll_del_event(epoll_ev, fde); + + return 0; +} + +/* + add a fd based event + return NULL on failure (memory allocation error) +*/ +static struct fd_event *epoll_event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx, + int fd, uint16_t flags, + event_fd_handler_t handler, + void *private_data) +{ + struct epoll_event_context *epoll_ev = talloc_get_type(ev->additional_data, + struct epoll_event_context); + struct fd_event *fde; + + fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event); + if (!fde) return NULL; + + fde->event_ctx = ev; + fde->fd = fd; + fde->flags = flags; + fde->handler = handler; + fde->private_data = private_data; + fde->additional_flags = 0; + fde->additional_data = NULL; + + epoll_ev->num_fd_events++; + talloc_set_destructor(fde, epoll_event_fd_destructor); + + epoll_add_event(epoll_ev, fde); + + return fde; +} + + +/* + return the fd event flags +*/ +static uint16_t epoll_event_get_fd_flags(struct fd_event *fde) +{ + return fde->flags; +} + +/* + set the fd event flags +*/ +static void epoll_event_set_fd_flags(struct fd_event *fde, uint16_t flags) +{ + struct event_context *ev; + struct epoll_event_context *epoll_ev; + + if (fde->flags == flags) return; + + ev = fde->event_ctx; + epoll_ev = talloc_get_type(ev->additional_data, struct epoll_event_context); + + fde->flags = flags; + + epoll_change_event(epoll_ev, fde); +} + +/* + do a single event loop using the events defined in ev +*/ +static int epoll_event_loop_once(struct event_context *ev) +{ + struct epoll_event_context *epoll_ev = talloc_get_type(ev->additional_data, + struct epoll_event_context); + struct timeval tval; + + tval = common_event_loop_delay(ev); + + if (timeval_is_zero(&tval)) { + common_event_loop_timer(ev); + return 0; + } + + return epoll_event_loop(epoll_ev, &tval); +} + +/* + return on failure or (with 0) if all fd events are removed +*/ +static int epoll_event_loop_wait(struct event_context *ev) +{ + struct epoll_event_context *epoll_ev = talloc_get_type(ev->additional_data, + struct epoll_event_context); + while (epoll_ev->num_fd_events) { + if (epoll_event_loop_once(ev) != 0) { + break; + } + } + + return 0; +} + +static const struct event_ops epoll_event_ops = { + .context_init = epoll_event_context_init, + .add_fd = epoll_event_add_fd, + .get_fd_flags = epoll_event_get_fd_flags, + .set_fd_flags = epoll_event_set_fd_flags, + .add_timed = common_event_add_timed, + .loop_once = epoll_event_loop_once, + .loop_wait = epoll_event_loop_wait, +}; + +NTSTATUS events_epoll_init(void) +{ + return event_register_backend("epoll", &epoll_event_ops); +} diff --git a/source4/lib/events/events_internal.h b/source4/lib/events/events_internal.h index de4e5f6a5a..dc321769e0 100644 --- a/source4/lib/events/events_internal.h +++ b/source4/lib/events/events_internal.h @@ -24,7 +24,7 @@ struct event_ops { /* conntext init */ - int (*context_init)(struct event_context *ev, void *private_data); + int (*context_init)(struct event_context *ev); /* fd_event functions */ struct fd_event *(*add_fd)(struct event_context *ev, @@ -41,6 +41,12 @@ struct event_ops { struct timeval next_event, event_timed_handler_t handler, void *private_data); + /* disk aio event functions */ + struct aio_event *(*add_aio)(struct event_context *ev, + TALLOC_CTX *mem_ctx, + struct iocb *iocb, + event_aio_handler_t handler, + void *private_data); /* loop functions */ int (*loop_once)(struct event_context *ev); @@ -71,11 +77,24 @@ struct timed_event { void *additional_data; }; +/* aio event is private to the aio backend */ +struct aio_event; + struct event_context { /* the specific events implementation */ const struct event_ops *ops; + + /* list of timed events - used by common code */ + struct timed_event *timed_events; + /* this is private for the events_ops implementation */ void *additional_data; }; -const struct event_ops *event_standard_get_ops(void); + +NTSTATUS event_register_backend(const char *name, const struct event_ops *ops); + +struct timed_event *common_event_add_timed(struct event_context *, TALLOC_CTX *, + struct timeval, event_timed_handler_t, void *); +void common_event_loop_timer(struct event_context *); +struct timeval common_event_loop_delay(struct event_context *); diff --git a/source4/lib/events/events_select.c b/source4/lib/events/events_select.c new file mode 100644 index 0000000000..5f4ecba5ca --- /dev/null +++ b/source4/lib/events/events_select.c @@ -0,0 +1,289 @@ +/* + Unix SMB/CIFS implementation. + main select loop and event handling + Copyright (C) Andrew Tridgell 2003-2005 + Copyright (C) Stefan Metzmacher 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +/* + This is SAMBA's default event loop code + +*/ + +#include "includes.h" +#include "system/filesys.h" +#include "system/select.h" +#include "lib/util/dlinklist.h" +#include "lib/events/events.h" +#include "lib/events/events_internal.h" + +struct select_event_context { + /* a pointer back to the generic event_context */ + struct event_context *ev; + + /* list of filedescriptor events */ + struct fd_event *fd_events; + + /* list of timed events */ + struct timed_event *timed_events; + + /* the maximum file descriptor number in fd_events */ + int maxfd; + + /* information for exiting from the event loop */ + int exit_code; + + /* this is changed by the destructors for the fd event + type. It is used to detect event destruction by event + handlers, which means the code that is calling the event + handler needs to assume that the linked list is no longer + valid + */ + uint32_t destruction_count; +}; + +/* + create a select_event_context structure. +*/ +static int select_event_context_init(struct event_context *ev) +{ + struct select_event_context *select_ev; + + select_ev = talloc_zero(ev, struct select_event_context); + if (!select_ev) return -1; + select_ev->ev = ev; + + ev->additional_data = select_ev; + return 0; +} + +/* + recalculate the maxfd +*/ +static void calc_maxfd(struct select_event_context *select_ev) +{ + struct fd_event *fde; + + select_ev->maxfd = 0; + for (fde = select_ev->fd_events; fde; fde = fde->next) { + if (fde->fd > select_ev->maxfd) { + select_ev->maxfd = fde->fd; + } + } +} + + +/* to mark the ev->maxfd invalid + * this means we need to recalculate it + */ +#define EVENT_INVALID_MAXFD (-1) + +/* + destroy an fd_event +*/ +static int select_event_fd_destructor(struct fd_event *fde) +{ + struct event_context *ev = fde->event_ctx; + struct select_event_context *select_ev = talloc_get_type(ev->additional_data, + struct select_event_context); + + if (select_ev->maxfd == fde->fd) { + select_ev->maxfd = EVENT_INVALID_MAXFD; + } + + DLIST_REMOVE(select_ev->fd_events, fde); + select_ev->destruction_count++; + + return 0; +} + +/* + add a fd based event + return NULL on failure (memory allocation error) +*/ +static struct fd_event *select_event_add_fd(struct event_context *ev, TALLOC_CTX *mem_ctx, + int fd, uint16_t flags, + event_fd_handler_t handler, + void *private_data) +{ + struct select_event_context *select_ev = talloc_get_type(ev->additional_data, + struct select_event_context); + struct fd_event *fde; + + fde = talloc(mem_ctx?mem_ctx:ev, struct fd_event); + if (!fde) return NULL; + + fde->event_ctx = ev; + fde->fd = fd; + fde->flags = flags; + fde->handler = handler; + fde->private_data = private_data; + fde->additional_flags = 0; + fde->additional_data = NULL; + + DLIST_ADD(select_ev->fd_events, fde); + if (fde->fd > select_ev->maxfd) { + select_ev->maxfd = fde->fd; + } + talloc_set_destructor(fde, select_event_fd_destructor); + + return fde; +} + + +/* + return the fd event flags +*/ +static uint16_t select_event_get_fd_flags(struct fd_event *fde) +{ + return fde->flags; +} + +/* + set the fd event flags +*/ +static void select_event_set_fd_flags(struct fd_event *fde, uint16_t flags) +{ + struct event_context *ev; + struct select_event_context *select_ev; + + if (fde->flags == flags) return; + + ev = fde->event_ctx; + select_ev = talloc_get_type(ev->additional_data, struct select_event_context); + + fde->flags = flags; +} + +/* + event loop handling using select() +*/ +static int select_event_loop_select(struct select_event_context *select_ev, struct timeval *tvalp) +{ + fd_set r_fds, w_fds; + struct fd_event *fde; + int selrtn; + uint32_t destruction_count = select_ev->destruction_count; + + /* we maybe need to recalculate the maxfd */ + if (select_ev->maxfd == EVENT_INVALID_MAXFD) { + calc_maxfd(select_ev); + } + + FD_ZERO(&r_fds); + FD_ZERO(&w_fds); + + /* setup any fd events */ + for (fde = select_ev->fd_events; fde; fde = fde->next) { + if (fde->flags & EVENT_FD_READ) { + FD_SET(fde->fd, &r_fds); + } + if (fde->flags & EVENT_FD_WRITE) { + FD_SET(fde->fd, &w_fds); + } + } + + selrtn = select(select_ev->maxfd+1, &r_fds, &w_fds, NULL, tvalp); + + if (selrtn == -1 && errno == EBADF) { + /* the socket is dead! this should never + happen as the socket should have first been + made readable and that should have removed + the event, so this must be a bug. This is a + fatal error. */ + DEBUG(0,("ERROR: EBADF on select_event_loop_once\n")); + select_ev->exit_code = EBADF; + return -1; + } + + if (selrtn == 0 && tvalp) { + common_event_loop_timer(select_ev->ev); + return 0; + } + + if (selrtn > 0) { + /* at least one file descriptor is ready - check + which ones and call the handler, being careful to allow + the handler to remove itself when called */ + for (fde = select_ev->fd_events; fde; fde = fde->next) { + uint16_t flags = 0; + + if (FD_ISSET(fde->fd, &r_fds)) flags |= EVENT_FD_READ; + if (FD_ISSET(fde->fd, &w_fds)) flags |= EVENT_FD_WRITE; + if (flags) { + fde->handler(select_ev->ev, fde, flags, fde->private_data); + if (destruction_count != select_ev->destruction_count) { + break; + } + } + } + } + + return 0; +} + +/* + do a single event loop using the events defined in ev +*/ +static int select_event_loop_once(struct event_context *ev) +{ + struct select_event_context *select_ev = talloc_get_type(ev->additional_data, + struct select_event_context); + struct timeval tval; + + tval = common_event_loop_delay(ev); + + if (timeval_is_zero(&tval)) { + common_event_loop_timer(ev); + return 0; + } + + return select_event_loop_select(select_ev, &tval); +} + +/* + return on failure or (with 0) if all fd events are removed +*/ +static int select_event_loop_wait(struct event_context *ev) +{ + struct select_event_context *select_ev = talloc_get_type(ev->additional_data, + struct select_event_context); + select_ev->exit_code = 0; + + while (select_ev->fd_events && select_ev->exit_code == 0) { + if (select_event_loop_once(ev) != 0) { + break; + } + } + + return select_ev->exit_code; +} + +static const struct event_ops select_event_ops = { + .context_init = select_event_context_init, + .add_fd = select_event_add_fd, + .get_fd_flags = select_event_get_fd_flags, + .set_fd_flags = select_event_set_fd_flags, + .add_timed = common_event_add_timed, + .loop_once = select_event_loop_once, + .loop_wait = select_event_loop_wait, +}; + +NTSTATUS events_select_init(void) +{ + return event_register_backend("select", &select_event_ops); +} diff --git a/source4/lib/events/events_standard.c b/source4/lib/events/events_standard.c index 12595d8518..b0f5259fa7 100644 --- a/source4/lib/events/events_standard.c +++ b/source4/lib/events/events_standard.c @@ -42,9 +42,6 @@ struct std_event_context { /* list of filedescriptor events */ struct fd_event *fd_events; - /* list of timed events */ - struct timed_event *timed_events; - /* the maximum file descriptor number in fd_events */ int maxfd; @@ -63,8 +60,6 @@ struct std_event_context { int epoll_fd; }; -static void std_event_loop_timer(struct std_event_context *std_ev); - /* use epoll if it is available */ #if WITH_EPOLL /* @@ -103,9 +98,8 @@ static int epoll_ctx_destructor(struct std_event_context *std_ev) /* init the epoll fd */ -static void epoll_init_ctx(struct std_event_context *std_ev, BOOL try_epoll) +static void epoll_init_ctx(struct std_event_context *std_ev) { - if (!try_epoll) return; std_ev->epoll_fd = epoll_create(64); talloc_set_destructor(std_ev, epoll_ctx_destructor); } @@ -243,7 +237,7 @@ static int epoll_event_loop(struct std_event_context *std_ev, struct timeval *tv } if (ret == 0 && tvalp) { - std_event_loop_timer(std_ev); + common_event_loop_timer(std_ev->ev); return 0; } @@ -283,7 +277,7 @@ static int epoll_event_loop(struct std_event_context *std_ev, struct timeval *tv return 0; } #else -#define epoll_init_ctx(std_ev,try_epoll) if (try_epoll) {/* fix unused variable warning*/} +#define epoll_init_ctx(std_ev) #define epoll_add_event(std_ev,fde) #define epoll_del_event(std_ev,fde) #define epoll_change_event(std_ev,fde) @@ -293,18 +287,16 @@ static int epoll_event_loop(struct std_event_context *std_ev, struct timeval *tv /* create a std_event_context structure. */ -static int std_event_context_init(struct event_context *ev, void *private_data) +static int std_event_context_init(struct event_context *ev) { struct std_event_context *std_ev; - BOOL *_try_epoll = private_data; - BOOL try_epoll = (_try_epoll == NULL ? True : *_try_epoll); std_ev = talloc_zero(ev, struct std_event_context); if (!std_ev) return -1; std_ev->ev = ev; std_ev->epoll_fd = -1; - epoll_init_ctx(std_ev, try_epoll); + epoll_init_ctx(std_ev); ev->additional_data = std_ev; return 0; @@ -415,93 +407,6 @@ static void std_event_set_fd_flags(struct fd_event *fde, uint16_t flags) } /* - destroy a timed event -*/ -static int std_event_timed_destructor(struct timed_event *te) -{ - struct std_event_context *std_ev = talloc_get_type(te->event_ctx->additional_data, - struct std_event_context); - DLIST_REMOVE(std_ev->timed_events, te); - return 0; -} - -static int std_event_timed_deny_destructor(struct timed_event *te) -{ - return -1; -} - -/* - add a timed event - return NULL on failure (memory allocation error) -*/ -static struct timed_event *std_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx, - struct timeval next_event, - event_timed_handler_t handler, - void *private_data) -{ - struct std_event_context *std_ev = talloc_get_type(ev->additional_data, - struct std_event_context); - struct timed_event *te, *last_te, *cur_te; - - te = talloc(mem_ctx?mem_ctx:ev, struct timed_event); - if (te == NULL) return NULL; - - te->event_ctx = ev; - te->next_event = next_event; - te->handler = handler; - te->private_data = private_data; - te->additional_data = NULL; - - /* keep the list ordered */ - last_te = NULL; - for (cur_te = std_ev->timed_events; cur_te; cur_te = cur_te->next) { - /* if the new event comes before the current one break */ - if (!timeval_is_zero(&cur_te->next_event) && - timeval_compare(&te->next_event, - &cur_te->next_event) < 0) { - break; - } - - last_te = cur_te; - } - - DLIST_ADD_AFTER(std_ev->timed_events, te, last_te); - - talloc_set_destructor(te, std_event_timed_destructor); - - return te; -} - -/* - a timer has gone off - call it -*/ -static void std_event_loop_timer(struct std_event_context *std_ev) -{ - struct timeval t = timeval_current(); - struct timed_event *te = std_ev->timed_events; - - if (te == NULL) { - return; - } - - /* deny the handler to free the event */ - talloc_set_destructor(te, std_event_timed_deny_destructor); - - /* We need to remove the timer from the list before calling the - * handler because in a semi-async inner event loop called from the - * handler we don't want to come across this event again -- vl */ - DLIST_REMOVE(std_ev->timed_events, te); - - te->handler(std_ev->ev, te, t, te->private_data); - - /* The destructor isn't necessary anymore, we've already removed the - * event from the list. */ - talloc_set_destructor(te, NULL); - - talloc_free(te); -} - -/* event loop handling using select() */ static int std_event_loop_select(struct std_event_context *std_ev, struct timeval *tvalp) @@ -543,7 +448,7 @@ static int std_event_loop_select(struct std_event_context *std_ev, struct timeva } if (selrtn == 0 && tvalp) { - std_event_loop_timer(std_ev); + common_event_loop_timer(std_ev->ev); return 0; } @@ -577,19 +482,11 @@ static int std_event_loop_once(struct event_context *ev) struct std_event_context); struct timeval tval; - /* work out the right timeout for all timed events */ - if (std_ev->timed_events) { - struct timeval t = timeval_current(); - tval = timeval_until(&t, &std_ev->timed_events->next_event); - if (timeval_is_zero(&tval)) { - std_event_loop_timer(std_ev); - return 0; - } - } else { - /* have a default tick time of 30 seconds. This guarantees - that code that uses its own timeout checking will be - able to proceeed eventually */ - tval = timeval_set(30, 0); + tval = common_event_loop_delay(ev); + + if (timeval_is_zero(&tval)) { + common_event_loop_timer(ev); + return 0; } if (epoll_event_loop(std_ev, &tval) == 0) { @@ -622,12 +519,13 @@ static const struct event_ops std_event_ops = { .add_fd = std_event_add_fd, .get_fd_flags = std_event_get_fd_flags, .set_fd_flags = std_event_set_fd_flags, - .add_timed = std_event_add_timed, + .add_timed = common_event_add_timed, .loop_once = std_event_loop_once, .loop_wait = std_event_loop_wait, }; -const struct event_ops *event_standard_get_ops(void) + +NTSTATUS events_standard_init(void) { - return &std_event_ops; + return event_register_backend("standard", &std_event_ops); } diff --git a/source4/lib/events/events_timed.c b/source4/lib/events/events_timed.c new file mode 100644 index 0000000000..6b0919d0f1 --- /dev/null +++ b/source4/lib/events/events_timed.c @@ -0,0 +1,136 @@ +/* + Unix SMB/CIFS implementation. + + common events code for timed events + + Copyright (C) Andrew Tridgell 2003-2006 + Copyright (C) Stefan Metzmacher 2005 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" +#include "system/filesys.h" +#include "system/select.h" +#include "lib/util/dlinklist.h" +#include "lib/events/events.h" +#include "lib/events/events_internal.h" + +/* + destroy a timed event +*/ +static int common_event_timed_destructor(struct timed_event *te) +{ + struct event_context *ev = talloc_get_type(te->event_ctx->additional_data, + struct event_context); + DLIST_REMOVE(ev->timed_events, te); + return 0; +} + +static int common_event_timed_deny_destructor(struct timed_event *te) +{ + return -1; +} + +/* + add a timed event + return NULL on failure (memory allocation error) +*/ +struct timed_event *common_event_add_timed(struct event_context *ev, TALLOC_CTX *mem_ctx, + struct timeval next_event, + event_timed_handler_t handler, + void *private_data) +{ + struct timed_event *te, *last_te, *cur_te; + + te = talloc(mem_ctx?mem_ctx:ev, struct timed_event); + if (te == NULL) return NULL; + + te->event_ctx = ev; + te->next_event = next_event; + te->handler = handler; + te->private_data = private_data; + te->additional_data = NULL; + + /* keep the list ordered */ + last_te = NULL; + for (cur_te = ev->timed_events; cur_te; cur_te = cur_te->next) { + /* if the new event comes before the current one break */ + if (!timeval_is_zero(&cur_te->next_event) && + timeval_compare(&te->next_event, + &cur_te->next_event) < 0) { + break; + } + + last_te = cur_te; + } + + DLIST_ADD_AFTER(ev->timed_events, te, last_te); + + talloc_set_destructor(te, common_event_timed_destructor); + + return te; +} + +/* + a timer has gone off - call it +*/ +void common_event_loop_timer(struct event_context *ev) +{ + struct timeval t = timeval_current(); + struct timed_event *te = ev->timed_events; + + if (te == NULL) { + return; + } + + /* deny the handler to free the event */ + talloc_set_destructor(te, common_event_timed_deny_destructor); + + /* We need to remove the timer from the list before calling the + * handler because in a semi-async inner event loop called from the + * handler we don't want to come across this event again -- vl */ + DLIST_REMOVE(ev->timed_events, te); + + te->handler(ev, te, t, te->private_data); + + /* The destructor isn't necessary anymore, we've already removed the + * event from the list. */ + talloc_set_destructor(te, NULL); + + talloc_free(te); +} + +/* + do a single event loop using the events defined in ev +*/ +struct timeval common_event_loop_delay(struct event_context *ev) +{ + struct timeval tval; + + /* work out the right timeout for all timed events */ + if (ev->timed_events) { + struct timeval t = timeval_current(); + tval = timeval_until(&t, &ev->timed_events->next_event); + } else { + /* have a default tick time of 30 seconds. This guarantees + that code that uses its own timeout checking will be + able to proceeed eventually */ + tval = timeval_set(30, 0); + } + + return tval; +} + |