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Allow updating of existing timers & file handle event watches

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This commit is contained in:
Daniel P. Berrange
2007-09-19 01:27:32 +00:00
parent 0bde7e57a2
commit c79514fda0
6 changed files with 153 additions and 39 deletions
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97
qemud/event.c
View File

@@ -31,6 +31,8 @@
#include "internal.h"
#include "event.h"
#define EVENT_DEBUG(fmt, ...) qemudDebug("EVENT: " fmt, __VA_ARGS__)
/* State for a single file handle being monitored */
struct virEventHandle {
int fd;
@@ -43,7 +45,7 @@ struct virEventHandle {
/* State for a single timer being generated */
struct virEventTimeout {
int timer;
int timeout;
int frequency;
unsigned long long expiresAt;
virEventTimeoutCallback cb;
void *opaque;
@@ -77,11 +79,11 @@ static int nextTimer = 0;
* For this reason we only ever append to existing list.
*/
int virEventAddHandleImpl(int fd, int events, virEventHandleCallback cb, void *opaque) {
qemudDebug("Add handle %d %d %p %p\n", fd, events, cb, opaque);
EVENT_DEBUG("Add handle %d %d %p %p", fd, events, cb, opaque);
if (eventLoop.handlesCount == eventLoop.handlesAlloc) {
struct virEventHandle *tmp;
qemudDebug("Used %d handle slots, adding %d more\n",
eventLoop.handlesAlloc, EVENT_ALLOC_EXTENT);
EVENT_DEBUG("Used %d handle slots, adding %d more",
eventLoop.handlesAlloc, EVENT_ALLOC_EXTENT);
tmp = realloc(eventLoop.handles,
sizeof(struct virEventHandle) *
(eventLoop.handlesAlloc + EVENT_ALLOC_EXTENT));
@@ -103,6 +105,16 @@ int virEventAddHandleImpl(int fd, int events, virEventHandleCallback cb, void *o
return 0;
}
void virEventUpdateHandleImpl(int fd, int events) {
int i;
for (i = 0 ; i < eventLoop.handlesCount ; i++) {
if (eventLoop.handles[i].fd == fd) {
eventLoop.handles[i].events = events;
break;
}
}
}
/*
* Unregister a callback from a file handle
* NB, it *must* be safe to call this from within a callback
@@ -111,13 +123,13 @@ int virEventAddHandleImpl(int fd, int events, virEventHandleCallback cb, void *o
*/
int virEventRemoveHandleImpl(int fd) {
int i;
qemudDebug("Remove handle %d\n", fd);
EVENT_DEBUG("Remove handle %d", fd);
for (i = 0 ; i < eventLoop.handlesCount ; i++) {
if (eventLoop.handles[i].deleted)
continue;
if (eventLoop.handles[i].fd == fd) {
qemudDebug("mark delete %d\n", i);
EVENT_DEBUG("mark delete %d", i);
eventLoop.handles[i].deleted = 1;
return 0;
}
@@ -131,17 +143,17 @@ int virEventRemoveHandleImpl(int fd) {
* NB, it *must* be safe to call this from within a callback
* For this reason we only ever append to existing list.
*/
int virEventAddTimeoutImpl(int timeout, virEventTimeoutCallback cb, void *opaque) {
struct timeval tv;
qemudDebug("Adding timeout with %d ms period", timeout);
if (gettimeofday(&tv, NULL) < 0) {
int virEventAddTimeoutImpl(int frequency, virEventTimeoutCallback cb, void *opaque) {
struct timeval now;
EVENT_DEBUG("Adding timer %d with %d ms freq", nextTimer, frequency);
if (gettimeofday(&now, NULL) < 0) {
return -1;
}
if (eventLoop.timeoutsCount == eventLoop.timeoutsAlloc) {
struct virEventTimeout *tmp;
qemudDebug("Used %d timeout slots, adding %d more\n",
eventLoop.timeoutsAlloc, EVENT_ALLOC_EXTENT);
EVENT_DEBUG("Used %d timeout slots, adding %d more",
eventLoop.timeoutsAlloc, EVENT_ALLOC_EXTENT);
tmp = realloc(eventLoop.timeouts,
sizeof(struct virEventTimeout) *
(eventLoop.timeoutsAlloc + EVENT_ALLOC_EXTENT));
@@ -153,20 +165,40 @@ int virEventAddTimeoutImpl(int timeout, virEventTimeoutCallback cb, void *opaque
}
eventLoop.timeouts[eventLoop.timeoutsCount].timer = nextTimer++;
eventLoop.timeouts[eventLoop.timeoutsCount].timeout = timeout;
eventLoop.timeouts[eventLoop.timeoutsCount].frequency = frequency;
eventLoop.timeouts[eventLoop.timeoutsCount].cb = cb;
eventLoop.timeouts[eventLoop.timeoutsCount].opaque = opaque;
eventLoop.timeouts[eventLoop.timeoutsCount].deleted = 0;
eventLoop.timeouts[eventLoop.timeoutsCount].expiresAt =
timeout +
(((unsigned long long)tv.tv_sec)*1000) +
(((unsigned long long)tv.tv_usec)/1000);
frequency >= 0 ? frequency +
(((unsigned long long)now.tv_sec)*1000) +
(((unsigned long long)now.tv_usec)/1000) : 0;
eventLoop.timeoutsCount++;
return nextTimer-1;
}
void virEventUpdateTimeoutImpl(int timer, int frequency) {
struct timeval tv;
int i;
EVENT_DEBUG("Updating timer %d timeout with %d ms freq", timer, frequency);
if (gettimeofday(&tv, NULL) < 0) {
return;
}
for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
if (eventLoop.timeouts[i].timer == timer) {
eventLoop.timeouts[i].frequency = frequency;
eventLoop.timeouts[i].expiresAt =
frequency >= 0 ? frequency +
(((unsigned long long)tv.tv_sec)*1000) +
(((unsigned long long)tv.tv_usec)/1000) : 0;
break;
}
}
}
/*
* Unregister a callback for a timer
* NB, it *must* be safe to call this from within a callback
@@ -175,6 +207,7 @@ int virEventAddTimeoutImpl(int timeout, virEventTimeoutCallback cb, void *opaque
*/
int virEventRemoveTimeoutImpl(int timer) {
int i;
EVENT_DEBUG("Remove timer %d", timer);
for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
if (eventLoop.timeouts[i].deleted)
continue;
@@ -196,13 +229,13 @@ int virEventRemoveTimeoutImpl(int timer) {
static int virEventCalculateTimeout(int *timeout) {
unsigned long long then = 0;
int i;
EVENT_DEBUG("Calculate expiry of %d timers", eventLoop.timeoutsCount);
/* Figure out if we need a timeout */
for (i = 0 ; i < eventLoop.timeoutsCount ; i++) {
if (eventLoop.timeouts[i].deleted)
if (eventLoop.timeouts[i].deleted || eventLoop.timeouts[i].frequency < 0)
continue;
qemudDebug("Got a timeout scheduled for %llu", eventLoop.timeouts[i].expiresAt);
EVENT_DEBUG("Got a timeout scheduled for %llu", eventLoop.timeouts[i].expiresAt);
if (then == 0 ||
eventLoop.timeouts[i].expiresAt < then)
then = eventLoop.timeouts[i].expiresAt;
@@ -220,14 +253,14 @@ static int virEventCalculateTimeout(int *timeout) {
((((unsigned long long)tv.tv_sec)*1000) +
(((unsigned long long)tv.tv_usec)/1000));
qemudDebug("Timeout at %llu due in %d ms", then, *timeout);
if (*timeout < 0)
*timeout = 1;
*timeout = 0;
} else {
qemudDebug("No timeout due");
*timeout = -1;
}
EVENT_DEBUG("Timeout at %llu due in %d ms", then, *timeout);
return 0;
}
@@ -256,7 +289,7 @@ static int virEventMakePollFDs(struct pollfd **retfds) {
fds[nfds].fd = eventLoop.handles[i].fd;
fds[nfds].events = eventLoop.handles[i].events;
fds[nfds].revents = 0;
qemudDebug("Wait for %d %d\n", eventLoop.handles[i].fd, eventLoop.handles[i].events);
//EVENT_DEBUG("Wait for %d %d", eventLoop.handles[i].fd, eventLoop.handles[i].events);
nfds++;
}
@@ -291,14 +324,14 @@ static int virEventDispatchTimeouts(void) {
(((unsigned long long)tv.tv_usec)/1000);
for (i = 0 ; i < ntimeouts ; i++) {
if (eventLoop.timeouts[i].deleted)
if (eventLoop.timeouts[i].deleted || eventLoop.timeouts[i].frequency < 0)
continue;
if (eventLoop.timeouts[i].expiresAt <= now) {
(eventLoop.timeouts[i].cb)(eventLoop.timeouts[i].timer,
eventLoop.timeouts[i].opaque);
eventLoop.timeouts[i].expiresAt =
now + eventLoop.timeouts[i].timeout;
now + eventLoop.timeouts[i].frequency;
}
}
return 0;
@@ -322,12 +355,12 @@ static int virEventDispatchHandles(struct pollfd *fds) {
for (i = 0 ; i < nhandles ; i++) {
if (eventLoop.handles[i].deleted) {
qemudDebug("Skip deleted %d\n", eventLoop.handles[i].fd);
EVENT_DEBUG("Skip deleted %d", eventLoop.handles[i].fd);
continue;
}
if (fds[i].revents) {
qemudDebug("Dispatch %d %d %p\n", fds[i].fd, fds[i].revents, eventLoop.handles[i].opaque);
EVENT_DEBUG("Dispatch %d %d %p", fds[i].fd, fds[i].revents, eventLoop.handles[i].opaque);
(eventLoop.handles[i].cb)(fds[i].fd, fds[i].revents,
eventLoop.handles[i].opaque);
}
@@ -353,7 +386,7 @@ static int virEventCleanupTimeouts(void) {
continue;
}
qemudDebug("Purging timeout %d with id %d", i, eventLoop.timeouts[i].timer);
EVENT_DEBUG("Purging timeout %d with id %d", i, eventLoop.timeouts[i].timer);
if ((i+1) < eventLoop.timeoutsCount) {
memmove(eventLoop.timeouts+i,
eventLoop.timeouts+i+1,
@@ -365,7 +398,7 @@ static int virEventCleanupTimeouts(void) {
/* Release some memory if we've got a big chunk free */
if ((eventLoop.timeoutsAlloc - EVENT_ALLOC_EXTENT) > eventLoop.timeoutsCount) {
struct virEventTimeout *tmp;
qemudDebug("Releasing %d out of %d timeout slots used, releasing %d\n",
EVENT_DEBUG("Releasing %d out of %d timeout slots used, releasing %d",
eventLoop.timeoutsCount, eventLoop.timeoutsAlloc, EVENT_ALLOC_EXTENT);
tmp = realloc(eventLoop.timeouts,
sizeof(struct virEventTimeout) *
@@ -406,7 +439,7 @@ static int virEventCleanupHandles(void) {
/* Release some memory if we've got a big chunk free */
if ((eventLoop.handlesAlloc - EVENT_ALLOC_EXTENT) > eventLoop.handlesCount) {
struct virEventHandle *tmp;
qemudDebug("Releasing %d out of %d handles slots used, releasing %d\n",
EVENT_DEBUG("Releasing %d out of %d handles slots used, releasing %d",
eventLoop.handlesCount, eventLoop.handlesAlloc, EVENT_ALLOC_EXTENT);
tmp = realloc(eventLoop.handles,
sizeof(struct virEventHandle) *
@@ -437,9 +470,9 @@ int virEventRunOnce(void) {
}
retry:
qemudDebug("Poll on %d handles %p timeout %d\n", nfds, fds, timeout);
EVENT_DEBUG("Poll on %d handles %p timeout %d", nfds, fds, timeout);
ret = poll(fds, nfds, timeout);
qemudDebug("Poll got %d event\n", ret);
EVENT_DEBUG("Poll got %d event", ret);
if (ret < 0) {
if (errno == EINTR) {
goto retry;

30
qemud/event.h
View File

@@ -38,6 +38,16 @@
*/
int virEventAddHandleImpl(int fd, int events, virEventHandleCallback cb, void *opaque);
/**
* virEventUpdateHandleImpl: change event set for a monitored file handle
*
* @fd: file handle to monitor for events
* @events: bitset of events to wach from POLLnnn constants
*
* Will not fail if fd exists
*/
void virEventUpdateHandleImpl(int fd, int events);
/**
* virEventRemoveHandleImpl: unregister a callback from a file handle
*
@@ -50,14 +60,30 @@ int virEventRemoveHandleImpl(int fd);
/**
* virEventAddTimeoutImpl: register a callback for a timer event
*
* @timeout: timeout between events in milliseconds
* @frequency: time between events in milliseconds
* @cb: callback to invoke when an event occurrs
* @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 virEventAddTimeoutImpl(int timeout, virEventTimeoutCallback cb, void *opaque);
int virEventAddTimeoutImpl(int frequency, virEventTimeoutCallback cb, void *opaque);
/**
* virEventUpdateTimeoutImpl: 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 virEventUpdateTimeoutImpl(int timer, int frequency);
/**
* virEventRemoveTimeoutImpl: unregister a callback for a timer

2
qemud/qemud.c
View File

@@ -688,8 +688,10 @@ static struct qemud_server *qemudInitialize(int sigread) {
goto cleanup;
__virEventRegisterImpl(virEventAddHandleImpl,
virEventUpdateHandleImpl,
virEventRemoveHandleImpl,
virEventAddTimeoutImpl,
virEventUpdateTimeoutImpl,
virEventRemoveTimeoutImpl);
virStateInitialize();