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194382c183
libvirt/tests/eventtest.c
Daniel P. Berrangé 194382c183 tests: convert eventtest to use public event APIs 
The event test directly calls the internal poll event impl
APIs. It does not rely on any specific details of the poll
impl, so it is better to use the public APIs.

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-02-04 14:00:44 +00:00

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/*
* eventtest.c: Test the libvirtd event loop impl
*
* Copyright (C) 2009, 2011-2014 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/>.
*/
#include <config.h>
#include <signal.h>
#include <time.h>
#if HAVE_MACH_CLOCK_ROUTINES
# include <mach/clock.h>
# include <mach/mach.h>
#endif
#include "testutils.h"
#include "internal.h"
#include "virfile.h"
#include "virthread.h"
#include "virlog.h"
#include "virutil.h"
#include "virevent.h"
VIR_LOG_INIT("tests.eventtest");
#define NUM_FDS 31
#define NUM_TIME 31
static struct handleInfo {
int pipeFD[2];
int fired;
int watch;
int error;
int delete;
} handles[NUM_FDS];
static struct timerInfo {
int timeout;
int timer;
int fired;
int error;
int delete;
} timers[NUM_TIME];
enum {
EV_ERROR_NONE,
EV_ERROR_WATCH,
EV_ERROR_FD,
EV_ERROR_EVENT,
EV_ERROR_DATA,
};
struct testEventResultData {
bool failed;
const char *msg;
};
static int
testEventResultCallback(const void *opaque)
{
const struct testEventResultData *data = opaque;
if (data->failed && data->msg)
fprintf(stderr, "%s", data->msg);
return data->failed;
}
static void
G_GNUC_PRINTF(3, 4)
testEventReport(const char *name, bool failed, const char *msg, ...)
{
va_list vargs;
va_start(vargs, msg);
char *str = NULL;
struct testEventResultData data;
if (msg)
str = g_strdup_vprintf(msg, vargs);
data.failed = failed;
data.msg = str;
ignore_value(virTestRun(name, testEventResultCallback, &data));
va_end(vargs);
VIR_FREE(str);
}
static void
testPipeReader(int watch, int fd, int events, void *data)
{
struct handleInfo *info = data;
char one;
info->fired = 1;
if (watch != info->watch) {
info->error = EV_ERROR_WATCH;
return;
}
if (fd != info->pipeFD[0]) {
info->error = EV_ERROR_FD;
return;
}
if (!(events & VIR_EVENT_HANDLE_READABLE)) {
info->error = EV_ERROR_EVENT;
return;
}
if (read(fd, &one, 1) != 1) {
info->error = EV_ERROR_DATA;
return;
}
info->error = EV_ERROR_NONE;
if (info->delete != -1)
virEventRemoveHandle(info->delete);
}
static void
testTimer(int timer, void *data)
{
struct timerInfo *info = data;
info->fired = 1;
if (timer != info->timer) {
info->error = EV_ERROR_WATCH;
return;
}
info->error = EV_ERROR_NONE;
if (info->delete != -1)
virEventRemoveTimeout(info->delete);
}
static pthread_mutex_t eventThreadMutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t eventThreadRunCond = PTHREAD_COND_INITIALIZER;
static int eventThreadRunOnce;
static pthread_cond_t eventThreadJobCond = PTHREAD_COND_INITIALIZER;
static int eventThreadJobDone;
G_GNUC_NORETURN static void *eventThreadLoop(void *data G_GNUC_UNUSED) {
while (1) {
pthread_mutex_lock(&eventThreadMutex);
while (!eventThreadRunOnce)
pthread_cond_wait(&eventThreadRunCond, &eventThreadMutex);
eventThreadRunOnce = 0;
pthread_mutex_unlock(&eventThreadMutex);
virEventRunDefaultImpl();
pthread_mutex_lock(&eventThreadMutex);
eventThreadJobDone = 1;
pthread_cond_signal(&eventThreadJobCond);
pthread_mutex_unlock(&eventThreadMutex);
}
}
static int
verifyFired(const char *name, int handle, int timer)
{
int handleFired = 0;
int timerFired = 0;
size_t i;
for (i = 0; i < NUM_FDS; i++) {
if (handles[i].fired) {
if (i != handle) {
testEventReport(name, 1,
"Handle %zu fired, but expected %d\n", i,
handle);
return EXIT_FAILURE;
} else {
if (handles[i].error != EV_ERROR_NONE) {
testEventReport(name, 1,
"Handle %zu fired, but had error %d\n", i,
handles[i].error);
return EXIT_FAILURE;
}
handleFired = 1;
}
} else {
if (i == handle) {
testEventReport(name, 1,
"Handle %d should have fired, but didn't\n",
handle);
return EXIT_FAILURE;
}
}
}
if (handleFired != 1 && handle != -1) {
testEventReport(name, 1,
"Something weird happened, expecting handle %d\n",
handle);
return EXIT_FAILURE;
}
for (i = 0; i < NUM_TIME; i++) {
if (timers[i].fired) {
if (i != timer) {
testEventReport(name, 1,
"Timer %zu fired, but expected %d\n", i, timer);
return EXIT_FAILURE;
} else {
if (timers[i].error != EV_ERROR_NONE) {
testEventReport(name, 1,
"Timer %zu fired, but had error %d\n", i,
timers[i].error);
return EXIT_FAILURE;
}
timerFired = 1;
}
} else {
if (i == timer) {
testEventReport(name, 1,
"Timer %d should have fired, but didn't\n",
timer);
return EXIT_FAILURE;
}
}
}
if (timerFired != 1 && timer != -1) {
testEventReport(name, 1,
"Something weird happened, expecting timer %d\n",
timer);
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
static void
startJob(void)
{
eventThreadRunOnce = 1;
eventThreadJobDone = 0;
pthread_cond_signal(&eventThreadRunCond);
pthread_mutex_unlock(&eventThreadMutex);
sched_yield();
pthread_mutex_lock(&eventThreadMutex);
}
static int
finishJob(const char *name, int handle, int timer)
{
unsigned long long now_us;
struct timespec waitTime;
int rc;
now_us = g_get_real_time();
waitTime.tv_sec = now_us / (1000*1000);
waitTime.tv_nsec = (now_us % ((now_us / (1000*1000)))) * 1000;
waitTime.tv_sec += 5;
rc = 0;
while (!eventThreadJobDone && rc == 0)
rc = pthread_cond_timedwait(&eventThreadJobCond, &eventThreadMutex,
&waitTime);
if (rc != 0) {
testEventReport(name, 1, "Timed out waiting for pipe event\n");
return EXIT_FAILURE;
}
if (verifyFired(name, handle, timer) != EXIT_SUCCESS)
return EXIT_FAILURE;
testEventReport(name, 0, NULL);
return EXIT_SUCCESS;
}
static void
resetAll(void)
{
size_t i;
for (i = 0; i < NUM_FDS; i++) {
handles[i].fired = 0;
handles[i].error = EV_ERROR_NONE;
}
for (i = 0; i < NUM_TIME; i++) {
timers[i].fired = 0;
timers[i].error = EV_ERROR_NONE;
}
}
static int
mymain(void)
{
size_t i;
pthread_t eventThread;
char one = '1';
for (i = 0; i < NUM_FDS; i++) {
if (pipe(handles[i].pipeFD) < 0) {
fprintf(stderr, "Cannot create pipe: %d", errno);
return EXIT_FAILURE;
}
}
char *debugEnv = getenv("LIBVIRT_DEBUG");
if (debugEnv && *debugEnv &&
(virLogSetDefaultPriority(virLogParseDefaultPriority(debugEnv)) < 0)) {
fprintf(stderr, "Invalid log level setting.\n");
return EXIT_FAILURE;
}
virEventRegisterDefaultImpl();
for (i = 0; i < NUM_FDS; i++) {
handles[i].delete = -1;
handles[i].watch =
virEventAddHandle(handles[i].pipeFD[0],
VIR_EVENT_HANDLE_READABLE,
testPipeReader,
&handles[i], NULL);
}
for (i = 0; i < NUM_TIME; i++) {
timers[i].delete = -1;
timers[i].timeout = -1;
timers[i].timer =
virEventAddTimeout(timers[i].timeout,
testTimer,
&timers[i], NULL);
}
pthread_create(&eventThread, NULL, eventThreadLoop, NULL);
pthread_mutex_lock(&eventThreadMutex);
/* First time, is easy - just try triggering one of our
* registered handles */
startJob();
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Simple write", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Now lets delete one before starting poll(), and
* try triggering another handle */
virEventRemoveHandle(handles[0].watch);
startJob();
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted before poll", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Next lets delete *during* poll, which should interrupt
* the loop with no event showing */
/* NB: this case is subject to a bit of a race condition.
* We yield & sleep, and pray that the other thread gets
* scheduled before we run EventRemoveHandle */
startJob();
pthread_mutex_unlock(&eventThreadMutex);
sched_yield();
g_usleep(100 * 1000);
pthread_mutex_lock(&eventThreadMutex);
virEventRemoveHandle(handles[1].watch);
if (finishJob("Interrupted during poll", -1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Getting more fun, lets delete a later handle during dispatch */
/* NB: this case is subject to a bit of a race condition.
* Only 1 time in 3 does the 2nd write get triggered by
* before poll() exits for the first safewrite(). We don't
* see a hard failure in other cases, so nothing to worry
* about */
startJob();
handles[2].delete = handles[3].watch;
if (safewrite(handles[2].pipeFD[1], &one, 1) != 1
|| safewrite(handles[3].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted during dispatch", 2, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Extreme fun, lets delete ourselves during dispatch */
startJob();
handles[2].delete = handles[2].watch;
if (safewrite(handles[2].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Deleted during dispatch", 2, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Run a timer on its own */
virEventUpdateTimeout(timers[1].timer, 100);
startJob();
if (finishJob("Firing a timer", -1, 1) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[1].timer, -1);
resetAll();
/* Now lets delete one before starting poll(), and
* try triggering another timer */
virEventUpdateTimeout(timers[1].timer, 100);
virEventRemoveTimeout(timers[0].timer);
startJob();
if (finishJob("Deleted before poll", -1, 1) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[1].timer, -1);
resetAll();
/* Next lets delete *during* poll, which should interrupt
* the loop with no event showing */
/* NB: this case is subject to a bit of a race condition.
* We yield & sleep, and pray that the other thread gets
* scheduled before we run EventRemoveTimeout */
startJob();
pthread_mutex_unlock(&eventThreadMutex);
sched_yield();
g_usleep(100 * 1000);
pthread_mutex_lock(&eventThreadMutex);
virEventRemoveTimeout(timers[1].timer);
if (finishJob("Interrupted during poll", -1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
/* Getting more fun, lets delete a later timer during dispatch */
/* NB: this case is subject to a bit of a race condition.
* Only 1 time in 3 does the 2nd write get triggered by
* before poll() exits for the first safewrite(). We don't
* see a hard failure in other cases, so nothing to worry
* about */
virEventUpdateTimeout(timers[2].timer, 100);
virEventUpdateTimeout(timers[3].timer, 100);
startJob();
timers[2].delete = timers[3].timer;
if (finishJob("Deleted during dispatch", -1, 2) != EXIT_SUCCESS)
return EXIT_FAILURE;
virEventUpdateTimeout(timers[2].timer, -1);
resetAll();
/* Extreme fun, lets delete ourselves during dispatch */
virEventUpdateTimeout(timers[2].timer, 100);
startJob();
timers[2].delete = timers[2].timer;
if (finishJob("Deleted during dispatch", -1, 2) != EXIT_SUCCESS)
return EXIT_FAILURE;
for (i = 0; i < NUM_FDS - 1; i++)
virEventRemoveHandle(handles[i].watch);
for (i = 0; i < NUM_TIME - 1; i++)
virEventRemoveTimeout(timers[i].timer);
resetAll();
/* Make sure the last handle still works several times in a row. */
for (i = 0; i < 4; i++) {
startJob();
if (safewrite(handles[NUM_FDS - 1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Simple write", NUM_FDS - 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
resetAll();
}
/* Final test, register same FD twice, once with no
* events, and make sure the right callback runs */
handles[0].pipeFD[0] = handles[1].pipeFD[0];
handles[0].pipeFD[1] = handles[1].pipeFD[1];
handles[0].watch = virEventAddHandle(handles[0].pipeFD[0],
0,
testPipeReader,
&handles[0], NULL);
handles[1].watch = virEventAddHandle(handles[1].pipeFD[0],
VIR_EVENT_HANDLE_READABLE,
testPipeReader,
&handles[1], NULL);
startJob();
if (safewrite(handles[1].pipeFD[1], &one, 1) != 1)
return EXIT_FAILURE;
if (finishJob("Write duplicate", 1, -1) != EXIT_SUCCESS)
return EXIT_FAILURE;
/* pthread_kill(eventThread, SIGTERM); */
return EXIT_SUCCESS;
}
VIR_TEST_MAIN(mymain)
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