mirror of
https://gitlab.com/libvirt/libvirt.git
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util: delete the poll() based event loop impl
It is no longer require since switching to the GLib based event loop impl. Reviewed-by: Pavel Hrdina <phrdina@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé
parent
946a25274c
commit
55fe8110af
@ -238,7 +238,6 @@
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@SRCDIR@/src/util/virerror.c
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@SRCDIR@/src/util/virerror.h
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@SRCDIR@/src/util/virevent.c
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@SRCDIR@/src/util/vireventpoll.c
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@SRCDIR@/src/util/virfcp.c
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@SRCDIR@/src/util/virfdstream.c
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@SRCDIR@/src/util/virfile.c
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@ -1938,19 +1938,6 @@ virEventGLibRegister;
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virEventGLibRunOnce;
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# util/vireventpoll.h
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virEventPollAddHandle;
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virEventPollAddTimeout;
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virEventPollFromNativeEvents;
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virEventPollInit;
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virEventPollRemoveHandle;
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virEventPollRemoveTimeout;
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virEventPollRunOnce;
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virEventPollToNativeEvents;
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virEventPollUpdateHandle;
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virEventPollUpdateTimeout;
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# util/virfcp.h
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virFCIsCapableRport;
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virFCReadRportValue;
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@ -1,20 +1,4 @@
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provider libvirt {
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# file: src/util/event_poll.c
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# prefix: event_poll
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probe event_poll_add_handle(int watch, int fd, int events, void *cb, void *opaque, void *ff);
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probe event_poll_update_handle(int watch, int events);
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probe event_poll_remove_handle(int watch);
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probe event_poll_dispatch_handle(int watch, int events);
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probe event_poll_purge_handle(int watch);
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probe event_poll_add_timeout(int timer, int frequency, void *cb, void *opaque, void *ff);
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probe event_poll_update_timeout(int timer, int frequency);
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probe event_poll_remove_timeout(int timer);
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probe event_poll_dispatch_timeout(int timer);
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probe event_poll_purge_timeout(int timer);
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probe event_poll_run(int nfds, int timeout);
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# file: src/util/vireventglib.c
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# prefix: event_glib
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probe event_glib_add_handle(int watch, int fd, int events, void *cb, void *opaque, void *ff);
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@ -65,8 +65,6 @@ UTIL_SOURCES = \
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util/vireventglib.h \
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util/vireventglibwatch.c \
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util/vireventglibwatch.h \
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util/vireventpoll.c \
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util/vireventpoll.h \
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util/virfcp.c \
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util/virfcp.h \
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util/virfdstream.c \
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@ -1,772 +0,0 @@
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/*
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* vireventpoll.c: Poll based event loop for monitoring file handles
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*
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* Copyright (C) 2007, 2010-2014 Red Hat, Inc.
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* Copyright (C) 2007 Daniel P. Berrange
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <poll.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "virthread.h"
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#include "virlog.h"
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#include "vireventpoll.h"
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#include "viralloc.h"
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#include "virutil.h"
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#include "virfile.h"
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#include "virerror.h"
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#include "virprobe.h"
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#include "virtime.h"
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#define EVENT_DEBUG(fmt, ...) VIR_DEBUG(fmt, __VA_ARGS__)
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#define VIR_FROM_THIS VIR_FROM_EVENT
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VIR_LOG_INIT("util.eventpoll");
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static int virEventPollInterruptLocked(void);
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/* State for a single file handle being monitored */
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struct virEventPollHandle {
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int watch;
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int fd;
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int events;
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virEventHandleCallback cb;
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virFreeCallback ff;
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void *opaque;
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int deleted;
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};
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/* State for a single timer being generated */
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struct virEventPollTimeout {
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int timer;
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int frequency;
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unsigned long long expiresAt;
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virEventTimeoutCallback cb;
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virFreeCallback ff;
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void *opaque;
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int deleted;
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};
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/* Allocate extra slots for virEventPollHandle/virEventPollTimeout
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records in this multiple */
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#define EVENT_ALLOC_EXTENT 10
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/* State for the main event loop */
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struct virEventPollLoop {
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virMutex lock;
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int running;
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virThread leader;
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int wakeupfd[2];
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size_t handlesCount;
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size_t handlesAlloc;
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struct virEventPollHandle *handles;
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size_t timeoutsCount;
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size_t timeoutsAlloc;
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struct virEventPollTimeout *timeouts;
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};
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/* Only have one event loop */
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static struct virEventPollLoop eventLoop;
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/* Unique ID for the next FD watch to be registered */
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static int nextWatch = 1;
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/* Unique ID for the next timer to be registered */
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static int nextTimer = 1;
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/*
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* Register a callback for monitoring file handle events.
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* NB, it *must* be safe to call this from within a callback
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* For this reason we only ever append to existing list.
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*/
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int virEventPollAddHandle(int fd, int events,
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virEventHandleCallback cb,
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void *opaque,
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virFreeCallback ff)
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{
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int watch;
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virMutexLock(&eventLoop.lock);
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if (eventLoop.handlesCount == eventLoop.handlesAlloc) {
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EVENT_DEBUG("Used %zu handle slots, adding at least %d more",
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eventLoop.handlesAlloc, EVENT_ALLOC_EXTENT);
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if (VIR_RESIZE_N(eventLoop.handles, eventLoop.handlesAlloc,
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eventLoop.handlesCount, EVENT_ALLOC_EXTENT) < 0) {
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virMutexUnlock(&eventLoop.lock);
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return -1;
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}
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}
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watch = nextWatch++;
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eventLoop.handles[eventLoop.handlesCount].watch = watch;
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eventLoop.handles[eventLoop.handlesCount].fd = fd;
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eventLoop.handles[eventLoop.handlesCount].events =
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virEventPollToNativeEvents(events);
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eventLoop.handles[eventLoop.handlesCount].cb = cb;
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eventLoop.handles[eventLoop.handlesCount].ff = ff;
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eventLoop.handles[eventLoop.handlesCount].opaque = opaque;
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eventLoop.handles[eventLoop.handlesCount].deleted = 0;
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eventLoop.handlesCount++;
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virEventPollInterruptLocked();
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PROBE(EVENT_POLL_ADD_HANDLE,
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"watch=%d fd=%d events=%d cb=%p opaque=%p ff=%p",
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watch, fd, events, cb, opaque, ff);
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virMutexUnlock(&eventLoop.lock);
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return watch;
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}
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void virEventPollUpdateHandle(int watch, int events)
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{
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size_t i;
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bool found = false;
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PROBE(EVENT_POLL_UPDATE_HANDLE,
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"watch=%d events=%d",
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watch, events);
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if (watch <= 0) {
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VIR_WARN("Ignoring invalid update watch %d", watch);
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return;
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}
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virMutexLock(&eventLoop.lock);
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for (i = 0; i < eventLoop.handlesCount; i++) {
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if (eventLoop.handles[i].watch == watch) {
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eventLoop.handles[i].events =
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virEventPollToNativeEvents(events);
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virEventPollInterruptLocked();
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found = true;
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break;
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}
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}
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virMutexUnlock(&eventLoop.lock);
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if (!found)
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VIR_WARN("Got update for non-existent handle watch %d", watch);
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}
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/*
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* Unregister a callback from a file handle
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* NB, it *must* be safe to call this from within a callback
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* For this reason we only ever set a flag in the existing list.
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* Actual deletion will be done out-of-band
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*/
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int virEventPollRemoveHandle(int watch)
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{
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size_t i;
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PROBE(EVENT_POLL_REMOVE_HANDLE,
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"watch=%d",
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watch);
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if (watch <= 0) {
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VIR_WARN("Ignoring invalid remove watch %d", watch);
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return -1;
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}
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virMutexLock(&eventLoop.lock);
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for (i = 0; i < eventLoop.handlesCount; i++) {
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if (eventLoop.handles[i].deleted)
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continue;
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if (eventLoop.handles[i].watch == watch) {
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EVENT_DEBUG("mark delete %zu %d", i, eventLoop.handles[i].fd);
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eventLoop.handles[i].deleted = 1;
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virEventPollInterruptLocked();
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virMutexUnlock(&eventLoop.lock);
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return 0;
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}
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}
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virMutexUnlock(&eventLoop.lock);
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return -1;
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}
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/*
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* Register a callback for a timer event
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* NB, it *must* be safe to call this from within a callback
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* For this reason we only ever append to existing list.
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*/
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int virEventPollAddTimeout(int frequency,
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virEventTimeoutCallback cb,
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void *opaque,
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virFreeCallback ff)
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{
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unsigned long long now;
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int ret;
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if (virTimeMillisNow(&now) < 0)
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return -1;
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virMutexLock(&eventLoop.lock);
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if (eventLoop.timeoutsCount == eventLoop.timeoutsAlloc) {
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EVENT_DEBUG("Used %zu timeout slots, adding at least %d more",
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eventLoop.timeoutsAlloc, EVENT_ALLOC_EXTENT);
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if (VIR_RESIZE_N(eventLoop.timeouts, eventLoop.timeoutsAlloc,
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eventLoop.timeoutsCount, EVENT_ALLOC_EXTENT) < 0) {
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virMutexUnlock(&eventLoop.lock);
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return -1;
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}
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}
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eventLoop.timeouts[eventLoop.timeoutsCount].timer = nextTimer++;
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eventLoop.timeouts[eventLoop.timeoutsCount].frequency = frequency;
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eventLoop.timeouts[eventLoop.timeoutsCount].cb = cb;
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eventLoop.timeouts[eventLoop.timeoutsCount].ff = ff;
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eventLoop.timeouts[eventLoop.timeoutsCount].opaque = opaque;
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eventLoop.timeouts[eventLoop.timeoutsCount].deleted = 0;
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eventLoop.timeouts[eventLoop.timeoutsCount].expiresAt =
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frequency >= 0 ? frequency + now : 0;
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eventLoop.timeoutsCount++;
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ret = nextTimer-1;
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virEventPollInterruptLocked();
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PROBE(EVENT_POLL_ADD_TIMEOUT,
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"timer=%d frequency=%d cb=%p opaque=%p ff=%p",
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ret, frequency, cb, opaque, ff);
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virMutexUnlock(&eventLoop.lock);
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return ret;
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}
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void virEventPollUpdateTimeout(int timer, int frequency)
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{
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unsigned long long now;
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size_t i;
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bool found = false;
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PROBE(EVENT_POLL_UPDATE_TIMEOUT,
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"timer=%d frequency=%d",
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timer, frequency);
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if (timer <= 0) {
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VIR_WARN("Ignoring invalid update timer %d", timer);
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return;
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}
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if (virTimeMillisNow(&now) < 0)
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return;
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virMutexLock(&eventLoop.lock);
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for (i = 0; i < eventLoop.timeoutsCount; i++) {
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if (eventLoop.timeouts[i].timer == timer) {
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eventLoop.timeouts[i].frequency = frequency;
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eventLoop.timeouts[i].expiresAt =
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frequency >= 0 ? frequency + now : 0;
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VIR_DEBUG("Set timer freq=%d expires=%llu", frequency,
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eventLoop.timeouts[i].expiresAt);
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virEventPollInterruptLocked();
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found = true;
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break;
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}
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}
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virMutexUnlock(&eventLoop.lock);
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if (!found)
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VIR_WARN("Got update for non-existent timer %d", timer);
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}
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/*
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* Unregister a callback for a timer
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* NB, it *must* be safe to call this from within a callback
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* For this reason we only ever set a flag in the existing list.
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* Actual deletion will be done out-of-band
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*/
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int virEventPollRemoveTimeout(int timer)
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{
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size_t i;
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PROBE(EVENT_POLL_REMOVE_TIMEOUT,
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"timer=%d",
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timer);
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if (timer <= 0) {
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VIR_WARN("Ignoring invalid remove timer %d", timer);
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return -1;
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}
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virMutexLock(&eventLoop.lock);
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for (i = 0; i < eventLoop.timeoutsCount; i++) {
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if (eventLoop.timeouts[i].deleted)
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continue;
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if (eventLoop.timeouts[i].timer == timer) {
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eventLoop.timeouts[i].deleted = 1;
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virEventPollInterruptLocked();
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virMutexUnlock(&eventLoop.lock);
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return 0;
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}
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}
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virMutexUnlock(&eventLoop.lock);
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return -1;
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}
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/* Iterates over all registered timeouts and determine which
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* will be the first to expire.
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* @timeout: filled with expiry time of soonest timer, or -1 if
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* no timeout is pending
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* returns: 0 on success, -1 on error
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*/
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static int virEventPollCalculateTimeout(int *timeout)
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{
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unsigned long long then = 0;
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size_t i;
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EVENT_DEBUG("Calculate expiry of %zu timers", eventLoop.timeoutsCount);
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/* Figure out if we need a timeout */
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for (i = 0; i < eventLoop.timeoutsCount; i++) {
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if (eventLoop.timeouts[i].deleted)
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continue;
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if (eventLoop.timeouts[i].frequency < 0)
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continue;
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EVENT_DEBUG("Got a timeout scheduled for %llu", eventLoop.timeouts[i].expiresAt);
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if (then == 0 ||
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eventLoop.timeouts[i].expiresAt < then)
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then = eventLoop.timeouts[i].expiresAt;
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}
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/* Calculate how long we should wait for a timeout if needed */
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if (then > 0) {
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unsigned long long now;
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if (virTimeMillisNow(&now) < 0)
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return -1;
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EVENT_DEBUG("Schedule timeout then=%llu now=%llu", then, now);
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if (then <= now)
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*timeout = 0;
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else
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*timeout = ((then - now) > INT_MAX) ? INT_MAX : (then - now);
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} else {
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*timeout = -1;
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}
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|
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if (*timeout > -1)
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EVENT_DEBUG("Timeout at %llu due in %d ms", then, *timeout);
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else
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EVENT_DEBUG("%s", "No timeout is pending");
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return 0;
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}
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/*
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* Allocate a pollfd array containing data for all registered
|
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* file handles. The caller must free the returned data struct
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* returns: the pollfd array, or NULL on error
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*/
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static struct pollfd *virEventPollMakePollFDs(int *nfds) {
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struct pollfd *fds;
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size_t i;
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|
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*nfds = 0;
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for (i = 0; i < eventLoop.handlesCount; i++) {
|
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if (eventLoop.handles[i].events && !eventLoop.handles[i].deleted)
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(*nfds)++;
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}
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/* Setup the poll file handle data structs */
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if (VIR_ALLOC_N(fds, *nfds) < 0)
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return NULL;
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*nfds = 0;
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for (i = 0; i < eventLoop.handlesCount; i++) {
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EVENT_DEBUG("Prepare n=%zu w=%d, f=%d e=%d d=%d", i,
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eventLoop.handles[i].watch,
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eventLoop.handles[i].fd,
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eventLoop.handles[i].events,
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eventLoop.handles[i].deleted);
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if (!eventLoop.handles[i].events || eventLoop.handles[i].deleted)
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continue;
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fds[*nfds].fd = eventLoop.handles[i].fd;
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fds[*nfds].events = eventLoop.handles[i].events;
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fds[*nfds].revents = 0;
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(*nfds)++;
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}
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return fds;
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}
|
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|
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|
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/*
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* Iterate over all timers and determine if any have expired.
|
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* Invoke the user supplied callback for each timer whose
|
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* expiry time is met, and schedule the next timeout. Does
|
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* not try to 'catch up' on time if the actual expiry time
|
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* was later than the requested time.
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*
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* This method must cope with new timers being registered
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* by a callback, and must skip any timers marked as deleted.
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*
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* Returns 0 upon success, -1 if an error occurred
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*/
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static int virEventPollDispatchTimeouts(void)
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{
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unsigned long long now;
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size_t i;
|
||||
/* Save this now - it may be changed during dispatch */
|
||||
int ntimeouts = eventLoop.timeoutsCount;
|
||||
VIR_DEBUG("Dispatch %d", ntimeouts);
|
||||
|
||||
if (virTimeMillisNow(&now) < 0)
|
||||
return -1;
|
||||
|
||||
for (i = 0; i < ntimeouts; i++) {
|
||||
if (eventLoop.timeouts[i].deleted || eventLoop.timeouts[i].frequency < 0)
|
||||
continue;
|
||||
|
||||
/* Add 20ms fuzz so we don't pointlessly spin doing
|
||||
* <10ms sleeps, particularly on kernels with low HZ
|
||||
* it is fine that a timer expires 20ms earlier than
|
||||
* requested
|
||||
*/
|
||||
if (eventLoop.timeouts[i].expiresAt <= (now+20)) {
|
||||
virEventTimeoutCallback cb = eventLoop.timeouts[i].cb;
|
||||
int timer = eventLoop.timeouts[i].timer;
|
||||
void *opaque = eventLoop.timeouts[i].opaque;
|
||||
eventLoop.timeouts[i].expiresAt =
|
||||
now + eventLoop.timeouts[i].frequency;
|
||||
|
||||
PROBE(EVENT_POLL_DISPATCH_TIMEOUT,
|
||||
"timer=%d",
|
||||
timer);
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
(cb)(timer, opaque);
|
||||
virMutexLock(&eventLoop.lock);
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Iterate over all file handles and dispatch any which
|
||||
* have pending events listed in the poll() data. Invoke
|
||||
* the user supplied callback for each handle which has
|
||||
* pending events
|
||||
*
|
||||
* This method must cope with new handles being registered
|
||||
* by a callback, and must skip any handles marked as deleted.
|
||||
*
|
||||
* Returns 0 upon success, -1 if an error occurred
|
||||
*/
|
||||
static int virEventPollDispatchHandles(int nfds, struct pollfd *fds)
|
||||
{
|
||||
size_t i, n;
|
||||
VIR_DEBUG("Dispatch %d", nfds);
|
||||
|
||||
/* NB, use nfds not eventLoop.handlesCount, because new
|
||||
* fds might be added on end of list, and they're not
|
||||
* in the fds array we've got */
|
||||
for (i = 0, n = 0; n < nfds && i < eventLoop.handlesCount; n++) {
|
||||
while (i < eventLoop.handlesCount &&
|
||||
(eventLoop.handles[i].fd != fds[n].fd ||
|
||||
eventLoop.handles[i].events == 0)) {
|
||||
i++;
|
||||
}
|
||||
if (i == eventLoop.handlesCount)
|
||||
break;
|
||||
|
||||
VIR_DEBUG("i=%zu w=%d", i, eventLoop.handles[i].watch);
|
||||
if (eventLoop.handles[i].deleted) {
|
||||
EVENT_DEBUG("Skip deleted n=%zu w=%d f=%d", i,
|
||||
eventLoop.handles[i].watch, eventLoop.handles[i].fd);
|
||||
continue;
|
||||
}
|
||||
|
||||
if (fds[n].revents) {
|
||||
virEventHandleCallback cb = eventLoop.handles[i].cb;
|
||||
int watch = eventLoop.handles[i].watch;
|
||||
void *opaque = eventLoop.handles[i].opaque;
|
||||
int hEvents = virEventPollFromNativeEvents(fds[n].revents);
|
||||
PROBE(EVENT_POLL_DISPATCH_HANDLE,
|
||||
"watch=%d events=%d",
|
||||
watch, hEvents);
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
(cb)(watch, fds[n].fd, hEvents, opaque);
|
||||
virMutexLock(&eventLoop.lock);
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/* Used post dispatch to actually remove any timers that
|
||||
* were previously marked as deleted. This asynchronous
|
||||
* cleanup is needed to make dispatch re-entrant safe.
|
||||
*/
|
||||
static void virEventPollCleanupTimeouts(void)
|
||||
{
|
||||
size_t i;
|
||||
size_t gap;
|
||||
VIR_DEBUG("Cleanup %zu", eventLoop.timeoutsCount);
|
||||
|
||||
/* Remove deleted entries, shuffling down remaining
|
||||
* entries as needed to form contiguous series
|
||||
*/
|
||||
for (i = 0; i < eventLoop.timeoutsCount;) {
|
||||
if (!eventLoop.timeouts[i].deleted) {
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
|
||||
PROBE(EVENT_POLL_PURGE_TIMEOUT,
|
||||
"timer=%d",
|
||||
eventLoop.timeouts[i].timer);
|
||||
if (eventLoop.timeouts[i].ff) {
|
||||
virFreeCallback ff = eventLoop.timeouts[i].ff;
|
||||
void *opaque = eventLoop.timeouts[i].opaque;
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
ff(opaque);
|
||||
virMutexLock(&eventLoop.lock);
|
||||
}
|
||||
|
||||
if ((i+1) < eventLoop.timeoutsCount) {
|
||||
size_t count = eventLoop.timeoutsCount - (i+1);
|
||||
memmove(eventLoop.timeouts+i,
|
||||
eventLoop.timeouts+i+1,
|
||||
sizeof(struct virEventPollTimeout)*count);
|
||||
}
|
||||
eventLoop.timeoutsCount--;
|
||||
}
|
||||
|
||||
/* Release some memory if we've got a big chunk free */
|
||||
gap = eventLoop.timeoutsAlloc - eventLoop.timeoutsCount;
|
||||
if (eventLoop.timeoutsCount == 0 ||
|
||||
(gap > eventLoop.timeoutsCount && gap > EVENT_ALLOC_EXTENT)) {
|
||||
EVENT_DEBUG("Found %zu out of %zu timeout slots used, releasing %zu",
|
||||
eventLoop.timeoutsCount, eventLoop.timeoutsAlloc, gap);
|
||||
VIR_SHRINK_N(eventLoop.timeouts, eventLoop.timeoutsAlloc, gap);
|
||||
}
|
||||
}
|
||||
|
||||
/* Used post dispatch to actually remove any handles that
|
||||
* were previously marked as deleted. This asynchronous
|
||||
* cleanup is needed to make dispatch re-entrant safe.
|
||||
*/
|
||||
static void virEventPollCleanupHandles(void)
|
||||
{
|
||||
size_t i;
|
||||
size_t gap;
|
||||
VIR_DEBUG("Cleanup %zu", eventLoop.handlesCount);
|
||||
|
||||
/* Remove deleted entries, shuffling down remaining
|
||||
* entries as needed to form contiguous series
|
||||
*/
|
||||
for (i = 0; i < eventLoop.handlesCount;) {
|
||||
if (!eventLoop.handles[i].deleted) {
|
||||
i++;
|
||||
continue;
|
||||
}
|
||||
|
||||
PROBE(EVENT_POLL_PURGE_HANDLE,
|
||||
"watch=%d",
|
||||
eventLoop.handles[i].watch);
|
||||
if (eventLoop.handles[i].ff) {
|
||||
virFreeCallback ff = eventLoop.handles[i].ff;
|
||||
void *opaque = eventLoop.handles[i].opaque;
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
ff(opaque);
|
||||
virMutexLock(&eventLoop.lock);
|
||||
}
|
||||
|
||||
if ((i+1) < eventLoop.handlesCount) {
|
||||
size_t count = eventLoop.handlesCount - (i+1);
|
||||
memmove(eventLoop.handles+i,
|
||||
eventLoop.handles+i+1,
|
||||
sizeof(struct virEventPollHandle)*count);
|
||||
}
|
||||
eventLoop.handlesCount--;
|
||||
}
|
||||
|
||||
/* Release some memory if we've got a big chunk free */
|
||||
gap = eventLoop.handlesAlloc - eventLoop.handlesCount;
|
||||
if (eventLoop.handlesCount == 0 ||
|
||||
(gap > eventLoop.handlesCount && gap > EVENT_ALLOC_EXTENT)) {
|
||||
EVENT_DEBUG("Found %zu out of %zu handles slots used, releasing %zu",
|
||||
eventLoop.handlesCount, eventLoop.handlesAlloc, gap);
|
||||
VIR_SHRINK_N(eventLoop.handles, eventLoop.handlesAlloc, gap);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Run a single iteration of the event loop, blocking until
|
||||
* at least one file handle has an event, or a timer expires
|
||||
*/
|
||||
int virEventPollRunOnce(void)
|
||||
{
|
||||
g_autofree struct pollfd *fds = NULL;
|
||||
int ret, timeout, nfds;
|
||||
|
||||
virMutexLock(&eventLoop.lock);
|
||||
eventLoop.running = 1;
|
||||
virThreadSelf(&eventLoop.leader);
|
||||
|
||||
virEventPollCleanupTimeouts();
|
||||
virEventPollCleanupHandles();
|
||||
|
||||
if (!(fds = virEventPollMakePollFDs(&nfds)) ||
|
||||
virEventPollCalculateTimeout(&timeout) < 0)
|
||||
goto error;
|
||||
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
|
||||
retry:
|
||||
PROBE(EVENT_POLL_RUN,
|
||||
"nhandles=%d timeout=%d",
|
||||
nfds, timeout);
|
||||
ret = poll(fds, nfds, timeout);
|
||||
if (ret < 0) {
|
||||
EVENT_DEBUG("Poll got error event %d", errno);
|
||||
if (errno == EINTR || errno == EAGAIN)
|
||||
goto retry;
|
||||
#ifdef __APPLE__
|
||||
if (errno == EBADF) {
|
||||
virMutexLock(&eventLoop.lock);
|
||||
goto cleanup;
|
||||
}
|
||||
#endif
|
||||
virReportSystemError(errno, "%s",
|
||||
_("Unable to poll on file handles"));
|
||||
return -1;
|
||||
}
|
||||
EVENT_DEBUG("Poll got %d event(s)", ret);
|
||||
|
||||
virMutexLock(&eventLoop.lock);
|
||||
if (virEventPollDispatchTimeouts() < 0)
|
||||
goto error;
|
||||
|
||||
if (ret > 0 &&
|
||||
virEventPollDispatchHandles(nfds, fds) < 0)
|
||||
goto error;
|
||||
|
||||
virEventPollCleanupTimeouts();
|
||||
virEventPollCleanupHandles();
|
||||
|
||||
#ifdef __APPLE__
|
||||
cleanup:
|
||||
#endif
|
||||
eventLoop.running = 0;
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
return 0;
|
||||
|
||||
error:
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
static void virEventPollHandleWakeup(int watch G_GNUC_UNUSED,
|
||||
int fd,
|
||||
int events G_GNUC_UNUSED,
|
||||
void *opaque G_GNUC_UNUSED)
|
||||
{
|
||||
char c;
|
||||
virMutexLock(&eventLoop.lock);
|
||||
ignore_value(saferead(fd, &c, sizeof(c)));
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
}
|
||||
|
||||
int virEventPollInit(void)
|
||||
{
|
||||
if (virMutexInit(&eventLoop.lock) < 0) {
|
||||
virReportSystemError(errno, "%s",
|
||||
_("Unable to initialize mutex"));
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (pipe2(eventLoop.wakeupfd, O_CLOEXEC | O_NONBLOCK) < 0) {
|
||||
virReportSystemError(errno, "%s",
|
||||
_("Unable to setup wakeup pipe"));
|
||||
return -1;
|
||||
}
|
||||
|
||||
if (virEventPollAddHandle(eventLoop.wakeupfd[0],
|
||||
VIR_EVENT_HANDLE_READABLE,
|
||||
virEventPollHandleWakeup, NULL, NULL) < 0) {
|
||||
virReportError(VIR_ERR_INTERNAL_ERROR,
|
||||
_("Unable to add handle %d to event loop"),
|
||||
eventLoop.wakeupfd[0]);
|
||||
VIR_FORCE_CLOSE(eventLoop.wakeupfd[0]);
|
||||
VIR_FORCE_CLOSE(eventLoop.wakeupfd[1]);
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int virEventPollInterruptLocked(void)
|
||||
{
|
||||
char c = '\0';
|
||||
|
||||
if (!eventLoop.running ||
|
||||
virThreadIsSelf(&eventLoop.leader)) {
|
||||
VIR_DEBUG("Skip interrupt, %d %llu", eventLoop.running,
|
||||
virThreadID(&eventLoop.leader));
|
||||
return 0;
|
||||
}
|
||||
|
||||
VIR_DEBUG("Interrupting");
|
||||
if (safewrite(eventLoop.wakeupfd[1], &c, sizeof(c)) != sizeof(c))
|
||||
return -1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int virEventPollInterrupt(void)
|
||||
{
|
||||
int ret;
|
||||
virMutexLock(&eventLoop.lock);
|
||||
ret = virEventPollInterruptLocked();
|
||||
virMutexUnlock(&eventLoop.lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int
|
||||
virEventPollToNativeEvents(int events)
|
||||
{
|
||||
int ret = 0;
|
||||
if (events & VIR_EVENT_HANDLE_READABLE)
|
||||
ret |= POLLIN;
|
||||
if (events & VIR_EVENT_HANDLE_WRITABLE)
|
||||
ret |= POLLOUT;
|
||||
if (events & VIR_EVENT_HANDLE_ERROR)
|
||||
ret |= POLLERR;
|
||||
if (events & VIR_EVENT_HANDLE_HANGUP)
|
||||
ret |= POLLHUP;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int
|
||||
virEventPollFromNativeEvents(int events)
|
||||
{
|
||||
int ret = 0;
|
||||
if (events & POLLIN)
|
||||
ret |= VIR_EVENT_HANDLE_READABLE;
|
||||
if (events & POLLOUT)
|
||||
ret |= VIR_EVENT_HANDLE_WRITABLE;
|
||||
if (events & POLLERR)
|
||||
ret |= VIR_EVENT_HANDLE_ERROR;
|
||||
if (events & POLLNVAL) /* Treat NVAL as error, since libvirt doesn't distinguish */
|
||||
ret |= VIR_EVENT_HANDLE_ERROR;
|
||||
if (events & POLLHUP)
|
||||
ret |= VIR_EVENT_HANDLE_HANGUP;
|
||||
return ret;
|
||||
}
|
||||
@ -1,126 +0,0 @@
|
||||
/*
|
||||
* vireventpoll.h: Poll based event loop for monitoring file handles
|
||||
*
|
||||
* Copyright (C) 2007 Daniel P. Berrange
|
||||
* Copyright (C) 2007 Red Hat, Inc.
|
||||
*
|
||||
* This library is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU Lesser General Public
|
||||
* License as published by the Free Software Foundation; either
|
||||
* version 2.1 of the License, or (at your option) any later version.
|
||||
*
|
||||
* This library 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
|
||||
* Lesser General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU Lesser General Public
|
||||
* License along with this library. If not, see
|
||||
* <http://www.gnu.org/licenses/>.
|
||||
*/
|
||||
|
||||
#pragma once
|
||||
|
||||
#include "internal.h"
|
||||
|
||||
/**
|
||||
* virEventPollAddHandle: register a callback for monitoring file handle events
|
||||
*
|
||||
* @fd: file handle to monitor for events
|
||||
* @events: bitset of events to watch from POLLnnn constants
|
||||
* @cb: callback to invoke when an event occurs
|
||||
* @opaque: user data to pass to callback
|
||||
*
|
||||
* returns -1 if the file handle cannot be registered, 0 upon success
|
||||
*/
|
||||
int virEventPollAddHandle(int fd, int events,
|
||||
virEventHandleCallback cb,
|
||||
void *opaque,
|
||||
virFreeCallback ff);
|
||||
|
||||
/**
|
||||
* virEventPollUpdateHandle: change event set for a monitored file handle
|
||||
*
|
||||
* @watch: watch whose handle to update
|
||||
* @events: bitset of events to watch from POLLnnn constants
|
||||
*
|
||||
* Will not fail if fd exists
|
||||
*/
|
||||
void virEventPollUpdateHandle(int watch, int events);
|
||||
|
||||
/**
|
||||
* virEventPollRemoveHandle: unregister a callback from a file handle
|
||||
*
|
||||
* @watch: watch whose handle to remove
|
||||
*
|
||||
* returns -1 if the file handle was not registered, 0 upon success
|
||||
*/
|
||||
int virEventPollRemoveHandle(int watch);
|
||||
|
||||
/**
|
||||
* virEventPollAddTimeout: register a callback for a timer event
|
||||
*
|
||||
* @frequency: time between events in milliseconds
|
||||
* @cb: callback to invoke when an event occurs
|
||||
* @opaque: user data to pass to callback
|
||||
*
|
||||
* Setting frequency to -1 will disable the timer. Setting the frequency
|
||||
* to zero will cause it to fire on every event loop iteration.
|
||||
*
|
||||
* returns -1 if the file handle cannot be registered, a positive
|
||||
* integer timer id upon success
|
||||
*/
|
||||
int virEventPollAddTimeout(int frequency,
|
||||
virEventTimeoutCallback cb,
|
||||
void *opaque,
|
||||
virFreeCallback ff);
|
||||
|
||||
/**
|
||||
* virEventPollUpdateTimeout: change frequency for a timer
|
||||
*
|
||||
* @timer: timer id to change
|
||||
* @frequency: time between events in milliseconds
|
||||
*
|
||||
* Setting frequency to -1 will disable the timer. Setting the frequency
|
||||
* to zero will cause it to fire on every event loop iteration.
|
||||
*
|
||||
* Will not fail if timer exists
|
||||
*/
|
||||
void virEventPollUpdateTimeout(int timer, int frequency);
|
||||
|
||||
/**
|
||||
* virEventPollRemoveTimeout: unregister a callback for a timer
|
||||
*
|
||||
* @timer: the timer id to remove
|
||||
*
|
||||
* returns -1 if the timer was not registered, 0 upon success
|
||||
*/
|
||||
int virEventPollRemoveTimeout(int timer);
|
||||
|
||||
/**
|
||||
* virEventPollInit: Initialize the event loop
|
||||
*
|
||||
* returns -1 if initialization failed
|
||||
*/
|
||||
int virEventPollInit(void);
|
||||
|
||||
/**
|
||||
* virEventPollRunOnce: run a single iteration of the event loop.
|
||||
*
|
||||
* Blocks the caller until at least one file handle has an
|
||||
* event or the first timer expires.
|
||||
*
|
||||
* returns -1 if the event monitoring failed
|
||||
*/
|
||||
int virEventPollRunOnce(void);
|
||||
|
||||
int virEventPollFromNativeEvents(int events);
|
||||
int virEventPollToNativeEvents(int events);
|
||||
|
||||
|
||||
/**
|
||||
* virEventPollInterrupt: wakeup any thread waiting in poll()
|
||||
*
|
||||
* return -1 if wakeup failed
|
||||
*/
|
||||
int virEventPollInterrupt(void);
|
||||
Loading…
Reference in New Issue
Block a user