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/*
* Copyright (c) 2008-2011 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 <dispatch/dispatch.h>
#include <dispatch/private.h>
#include <stdlib.h>
#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
#include <unistd.h>
#ifdef __ANDROID__
#include <linux/sysctl.h>
#else
#if !defined(__linux__)
#include <sys/sysctl.h>
#endif
#endif /* __ANDROID__ */
#endif
#include <assert.h>
#include <bsdtests.h>
#include "dispatch_test.h"
#define LAPS 10000
#define INTERVAL 100
#if TARGET_OS_EMBEDDED
#define BUSY 10000
#define NTHREADS 16
#else
#define BUSY 1000000
#define NTHREADS 64
#endif
static dispatch_group_t g;
static volatile size_t r_count, w_count, workers, readers, writers, crw, count, drain;
static void
writer(void *ctxt)
{
size_t w = __sync_add_and_fetch(&writers, 1), *m = (size_t *)ctxt;
if (w > *m) *m = w;
usleep(10000);
size_t busy = BUSY;
while (busy--) if (readers) __sync_add_and_fetch(&crw, 1);
if (__sync_sub_and_fetch(&w_count, 1) == 0) {
if (r_count == 0) {
dispatch_async(dispatch_get_main_queue(), ^{test_stop();});
}
}
__sync_sub_and_fetch(&writers, 1);
dispatch_group_leave(g);
}
static void
reader(void *ctxt)
{
size_t r = __sync_add_and_fetch(&readers, 1), *m = (size_t *)ctxt;
if (r > *m) *m = r;
usleep(10000);
size_t busy = BUSY;
while (busy--) if (writers) __sync_add_and_fetch(&crw, 1);
if (__sync_sub_and_fetch(&r_count, 1) == 0) {
if (r_count == 0) {
dispatch_async(dispatch_get_main_queue(), ^{test_stop();});
}
}
__sync_sub_and_fetch(&readers, 1);
}
static void
test_readsync(dispatch_queue_t rq, dispatch_queue_t wq, size_t n)
{
size_t i, max_readers = 0, max_writers = 0;
size_t *mrs = calloc(n, sizeof(size_t)), *mr, *mw = &max_writers;
r_count = LAPS * 2;
w_count = LAPS / INTERVAL;
workers = readers = writers = crw = count = 0;
for (i = 0, mr = mrs; i < n; i++, mr++) {
dispatch_group_async(g,
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH,
DISPATCH_QUEUE_OVERCOMMIT), ^{
__sync_add_and_fetch(&workers, 1);
do {
usleep(100000);
} while (workers < n);
for (;;) {
size_t idx = __sync_add_and_fetch(&count, 1);
if (idx > LAPS) break;
dispatch_sync_f(rq, mr, reader);
if (!(idx % INTERVAL)) {
dispatch_group_enter(g);
dispatch_barrier_async_f(wq, mw, writer);
}
dispatch_sync_f(rq, mr, reader);
if (!(idx % (INTERVAL*10))) {
// Let the queue drain
__sync_add_and_fetch(&drain, 1);
usleep(10000);
dispatch_barrier_sync(wq, ^{});
__sync_sub_and_fetch(&drain, 1);
} else while (drain) usleep(1000);
}
});
}
dispatch_group_wait(g, DISPATCH_TIME_FOREVER);
for (i = 0, mr = mrs; i < n; i++, mr++) {
if (*mr > max_readers) max_readers = *mr;
}
free(mrs);
test_sizet("max readers", max_readers, n);
test_sizet("max writers", max_writers, 1);
test_sizet("concurrent readers & writers", crw, 0);
}
int
main(void)
{
dispatch_test_start("Dispatch Reader/Writer Queues");
uint32_t activecpu, wq_max_threads;
#ifdef __linux__
activecpu = (uint32_t)sysconf(_SC_NPROCESSORS_ONLN);
// don't want to parse /proc/sys/kernel/threads-max
wq_max_threads = activecpu * NTHREADS + 2;
#elif defined(_WIN32)
SYSTEM_INFO si;
GetSystemInfo(&si);
activecpu = si.dwNumberOfProcessors;
wq_max_threads = activecpu * NTHREADS + 2;
#else
size_t s = sizeof(uint32_t);
sysctlbyname("hw.activecpu", &activecpu, &s, NULL, 0);
s = sizeof(uint32_t);
sysctlbyname("kern.wq_max_threads", &wq_max_threads, &s, NULL, 0);
#endif
// cap at wq_max_threads - one wq thread for dq - one wq thread for manager
size_t n = MIN(activecpu * NTHREADS, wq_max_threads - 2);
g = dispatch_group_create();
dispatch_queue_attr_t qattr = NULL;
#if DISPATCH_API_VERSION >= 20100518 // rdar://problem/7790099
qattr = DISPATCH_QUEUE_CONCURRENT;
#endif
dispatch_queue_t dq = dispatch_queue_create("readsync", qattr);
assert(dq);
if (!qattr) {
dispatch_queue_set_width(dq, LONG_MAX); // rdar://problem/7919264
dispatch_barrier_sync(dq, ^{}); // wait for changes to take effect
}
test_readsync(dq, dq, n);
dispatch_queue_t tq = dispatch_queue_create("writebarrierasync", qattr);
assert(tq);
if (!qattr) {
dispatch_queue_set_width(tq, LONG_MAX);
}
dispatch_set_target_queue(dq, tq);
dispatch_barrier_sync(tq, ^{}); // wait for changes to take effect
test_readsync(dq, tq, n); // rdar://problem/8186485
dispatch_release(tq);
dispatch_release(dq);
dispatch_release(g);
dispatch_main();
}
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