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/*
* Copyright (c) 2010-2011 Apple Inc. All rights reserved.
*
* @APPLE_APACHE_LICENSE_HEADER_START@
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* @APPLE_APACHE_LICENSE_HEADER_END@
*/
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#ifdef __APPLE__
#include <mach/mach_time.h>
#include <libkern/OSAtomic.h>
#endif
#include <dispatch/dispatch.h>
#include <bsdtests.h>
#include "dispatch_test.h"
#define delay (1ull * NSEC_PER_SEC)
#define interval (5ull * NSEC_PER_USEC)
#define N 25000
static dispatch_source_t t[N];
static dispatch_queue_t q;
static dispatch_group_t g;
static volatile int32_t count;
static mach_timebase_info_data_t tbi;
static uint64_t start, last;
#define elapsed_ms(x) (((now-(x))*tbi.numer/tbi.denom)/(1000ull*NSEC_PER_USEC))
static
void
test_fin(void *cxt)
{
uint32_t finalCount = (uint32_t)count;
fprintf(stderr, "Called back every %llu us on average\n",
(delay/finalCount)/NSEC_PER_USEC);
test_long_less_than("Frequency", 1,
(long)ceil((double)delay/(double)(finalCount*interval)));
int i;
for (i = 0; i < N; i++) {
dispatch_source_cancel(t[i]);
dispatch_release(t[i]);
}
dispatch_resume(q);
dispatch_release(q);
dispatch_release(g);
test_ptr("finalizer ran", cxt, cxt);
test_stop();
}
static
void
test_short_timer(void)
{
// Add a large number of timers with suspended target queue in front of
// the timer being measured <rdar://problem/7401353>
g = dispatch_group_create();
q = dispatch_queue_create("q", NULL);
int i;
for (i = 0; i < N; i++) {
t[i] = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, q);
dispatch_source_set_timer(t[i], DISPATCH_TIME_NOW, interval, 0);
dispatch_group_enter(g);
dispatch_source_set_registration_handler(t[i], ^{
dispatch_suspend(t[i]);
dispatch_group_leave(g);
});
dispatch_resume(t[i]);
}
// Wait for registration & configuration of all timers
dispatch_group_wait(g, DISPATCH_TIME_FOREVER);
dispatch_suspend(q);
for (i = 0; i < N; i++) {
dispatch_resume(t[i]);
}
dispatch_source_t s = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,
0, 0, dispatch_get_global_queue(0, 0));
test_ptr_notnull("dispatch_source_create", s);
dispatch_source_set_timer(s, DISPATCH_TIME_NOW, interval, 0);
dispatch_source_set_event_handler(s, ^{
uint64_t now = mach_absolute_time();
if (!count) {
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, delay),
dispatch_get_global_queue(0, 0), ^{
dispatch_source_cancel(s);
dispatch_release(s);
});
fprintf(stderr, "First timer callback (after %4llu ms)\n",
elapsed_ms(start));
}
OSAtomicIncrement32(&count);
if (elapsed_ms(last) >= 100) {
fprintf(stderr, "%5d timer callbacks (after %4llu ms)\n", count,
elapsed_ms(start));
last = now;
}
});
dispatch_set_context(s, s);
dispatch_set_finalizer_f(s, test_fin);
fprintf(stderr, "Scheduling %llu us timer\n", interval/NSEC_PER_USEC);
start = last = mach_absolute_time();
dispatch_resume(s);
}
int
main(void)
{
dispatch_test_start("Dispatch Short Timer"); // <rdar://problem/7765184>
mach_timebase_info(&tbi);
test_short_timer();
dispatch_main();
return 0;
}
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