309 строки
8.8 KiB
C
309 строки
8.8 KiB
C
/*
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* Copyright (c) 2010 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
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*/
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#include "opal_config.h"
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#include "opal/constants.h"
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#include "config.h"
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif
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#ifdef WIN32
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#undef WIN32_LEAN_AND_MEAN
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#endif
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#ifdef HAVE_SYS_TIME_H
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#include <sys/time.h>
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#endif
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#include <sys/queue.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifndef WIN32
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#endif
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <assert.h>
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#include <time.h>
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#include "opal/class/opal_object.h"
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#include "opal/threads/mutex.h"
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#include "opal/threads/threads.h"
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#include "opal/util/output.h"
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#include "opal/util/argv.h"
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#include "opal/util/fd.h"
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#include "opal/mca/base/mca_base_param.h"
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#include "libevent2013.h"
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#include "opal/mca/event/base/base.h"
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#include "libevent/event.h"
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#include "libevent/event-internal.h"
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#include "opal/mca/event/event.h"
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/* copied from event.c */
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#if defined(_EVENT_HAVE_EVENT_PORTS) && _EVENT_HAVE_EVENT_PORTS
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extern const struct eventop evportops;
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#endif
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#if defined(_EVENT_HAVE_SELECT) && _EVENT_HAVE_SELECT
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extern const struct eventop selectops;
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#endif
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#if defined(_EVENT_HAVE_POLL) && _EVENT_HAVE_POLL
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extern const struct eventop pollops;
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#endif
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#if defined(_EVENT_HAVE_EPOLL) && _EVENT_HAVE_EPOLL
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extern const struct eventop epollops;
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#endif
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#if defined(_EVENT_HAVE_WORKING_KQUEUE) && _EVENT_HAVE_WORKING_KQUEUE
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extern const struct eventop kqops;
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#endif
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#if defined(_EVENT_HAVE_DEVPOLL) && _EVENT_HAVE_DEVPOLL
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extern const struct eventop devpollops;
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#endif
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#ifdef WIN32
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extern const struct eventop win32ops;
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#endif
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/* Array of backends in order of preference. */
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static const struct eventop *eventops[] = {
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#if defined(_EVENT_HAVE_EVENT_PORTS) && _EVENT_HAVE_EVENT_PORTS
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&evportops,
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#endif
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#if defined(_EVENT_HAVE_WORKING_KQUEUE) && _EVENT_HAVE_WORKING_KQUEUE
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&kqops,
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#endif
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#if defined(_EVENT_HAVE_EPOLL) && _EVENT_HAVE_EPOLL
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&epollops,
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#endif
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#if defined(_EVENT_HAVE_DEVPOLL) && _EVENT_HAVE_DEVPOLL
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&devpollops,
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#endif
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#if defined(_EVENT_HAVE_POLL) && _EVENT_HAVE_POLL
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&pollops,
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#endif
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#if defined(_EVENT_HAVE_SELECT) && _EVENT_HAVE_SELECT
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&selectops,
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#endif
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#ifdef WIN32
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&win32ops,
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#endif
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NULL
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};
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static struct event_config *config=NULL;
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static void update_event(int fd, short flags, void* arg)
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{
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opal_event_update_t up;
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/* read the event */
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opal_fd_read(fd, sizeof(opal_event_update_t), &up);
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if (NULL == up.ev) {
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return;
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}
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if (OPAL_EVENT_ADD == up.op) {
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event_add(up.ev, 0);
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} else if (OPAL_EVENT_DEL == up.op) {
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event_del(up.ev);
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}
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return;
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}
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/* Public function -- not part of the module */
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/* This includes (hopefully) a temporary change
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* to deal with cross-base sync. Specifically,
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* when an event in one base needs to release
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* a condition_wait in another base, we need
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* to "wakeup" the event base in the second base
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* so the condition_wait can be checked
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*/
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opal_event_base_t* opal_event_base_create(void)
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{
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struct event_base *base;
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opal_event_base_t *evbase;
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base = event_base_new_with_config(config);
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if (NULL == base) {
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/* there is no backend method that does what we want */
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opal_output(0, "No event method available");
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return NULL;
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}
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evbase = (opal_event_base_t*)malloc(sizeof(opal_event_base_t));
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evbase->base = base;
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#ifndef __WINDOWS__
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if (pipe(evbase->update_pipe) < 0) {
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opal_output(0, "Unable to open update pipe");
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free(evbase);
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event_base_free(base);
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return NULL;
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}
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#else
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if (create_socketpair(AF_UNIX, SOCK_STREAM, 0, evbase->update_pipe) == -1) {
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opal_output(0, "Unable to open update socket");
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free(evbase);
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event_base_free(base);
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return NULL;
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}
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#endif
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event_assign(&evbase->update_event, base,
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evbase->update_pipe[0], EV_READ | EV_PERSIST,
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update_event, NULL);
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event_add(&evbase->update_event, 0);
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return evbase;
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}
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void opal_event_base_finalize(opal_event_base_t *evbase)
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{
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/* delete the wakeup event */
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event_del(&evbase->update_event);
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#ifndef __WINDOWS__
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/* close the pipe */
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close(evbase->update_pipe[0]);
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close(evbase->update_pipe[1]);
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#else
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/* close the socket */
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closesocket(evbase->update_pipe[0]);
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closesocket(evbase->update_pipe[1]);
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#endif
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/* release the base */
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event_base_free(evbase->base);
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/* free the storage */
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free(evbase);
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}
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int opal_event_init(void)
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{
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char* event_module_include=NULL;
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char **modules=NULL, **includes=NULL;
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bool dumpit=false;
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int i, j;
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const struct eventop** _eventop = eventops;
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char available_eventops[1024] = "none";
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char* help_msg = NULL;
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int position = 0;
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if (opal_output_get_verbosity(opal_event_base_output) > 4) {
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event_enable_debug_mode();
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event_set_debug_output(true);
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dumpit = true;
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}
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#if OPAL_EVENT_HAVE_THREAD_SUPPORT
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/* turn on libevent thread safety */
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evthread_use_pthreads ();
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#endif
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/* Retrieve the upper level specified event system, if any.
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* Default to select() on OS X and poll() everywhere else because
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* various parts of OMPI / ORTE use libevent with pty's. pty's
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* *only* work with select on OS X (tested on Tiger and Leopard);
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* we *know* that both select and poll works with pty's everywhere
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* else we care about (other mechansisms such as epoll *may* work
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* with pty's -- we have not tested comprehensively with newer
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* versions of Linux, etc.). So the safe thing to do is:
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*
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* - On OS X, default to using "select" only
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* - Everywhere else, default to using "poll" only (because poll
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* is more scalable than select)
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*
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* An upper layer may override this setting if it knows that pty's
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* won't be used with libevent. For example, we currently have
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* ompi_mpi_init() set to use "all" (to include epoll and friends)
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* so that the TCP BTL can be a bit more scalable -- because we
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* *know* that MPI apps don't use pty's with libevent.
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* Note that other tools explicitly *do* use pty's with libevent:
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*
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* - orted
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* - orterun (probably only if it launches locally)
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* - ...?
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*/
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while( NULL != (*_eventop) ) {
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opal_argv_append_nosize(&modules, (*_eventop)->name);
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if( 0 != position ) {
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position += snprintf( available_eventops + position,
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(size_t)(1024 - position),
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", %s", (*_eventop)->name );
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} else {
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position += snprintf( available_eventops + position,
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(size_t)(1024 - position),
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"%s", (*_eventop)->name );
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}
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available_eventops[position] = '\0';
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_eventop++; /* go to the next available eventop */
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}
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asprintf( &help_msg,
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"Comma-delimited list of libevent subsystems "
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"to use (%s -- available on your platform)",
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available_eventops );
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mca_base_param_reg_string_name("opal", "event_include",
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help_msg, false, false,
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#ifdef __APPLE__
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"select",
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#else
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#ifdef __WINDOWS__
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"win32",
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#else
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"poll",
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#endif
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#endif
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&event_module_include);
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if (dumpit) {
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opal_output(0, "event: available subsystems: %s", available_eventops);
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}
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free(help_msg); /* release the help message */
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if (NULL == event_module_include) {
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/* Shouldn't happen, but... */
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event_module_include = strdup("select");
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}
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includes = opal_argv_split(event_module_include,',');
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free(event_module_include);
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/* get a configuration object */
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config = event_config_new();
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/* cycle thru the available subsystems */
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for (i=0; NULL != modules[i]; i++) {
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/* if this module isn't included in the given ones,
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* then exclude it
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*/
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dumpit = true;
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for (j=0; NULL != includes[j]; j++) {
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if (0 == strcmp("all", includes[j]) ||
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0 == strcmp(modules[i], includes[j])) {
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dumpit = false;
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break;
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}
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}
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if (dumpit) {
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event_config_avoid_method(config, modules[i]);
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}
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}
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opal_argv_free(includes);
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opal_argv_free(modules);
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return OPAL_SUCCESS;
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}
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int opal_event_reinit(opal_event_base_t *evbase)
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{
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return event_reinit(evbase->base);
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}
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struct timeval *opal_event_base_init_common_timeout (opal_event_base_t *evbase,
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struct timeval *tv_in)
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{
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return (struct timeval*)event_base_init_common_timeout (evbase->base, tv_in);
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}
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