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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "task.h"
#include "uv.h"
#include <stdio.h>
#include <stdlib.h>
#define NUM_PINGS (1000 * 1000)
#define ACCESS_ONCE(type, var) (*(volatile type*) &(var))
static unsigned int callbacks;
static volatile int done;
static const char running[] = "running";
static const char stop[] = "stop";
static const char stopped[] = "stopped";
static void async_cb(uv_async_t* handle) {
if (++callbacks == NUM_PINGS) {
/* Tell the pummel thread to stop. */
ACCESS_ONCE(const char*, handle->data) = stop;
/* Wait for for the pummel thread to acknowledge that it has stoppped. */
while (ACCESS_ONCE(const char*, handle->data) != stopped)
uv_sleep(0);
uv_close((uv_handle_t*) handle, NULL);
}
}
static void pummel(void* arg) {
uv_async_t* handle = (uv_async_t*) arg;
while (ACCESS_ONCE(const char*, handle->data) == running)
uv_async_send(handle);
/* Acknowledge that we've seen handle->data change. */
ACCESS_ONCE(const char*, handle->data) = stopped;
}
static int test_async_pummel(int nthreads) {
uv_thread_t* tids;
uv_async_t handle;
uint64_t time;
int i;
tids = calloc(nthreads, sizeof(tids[0]));
ASSERT(tids != NULL);
ASSERT(0 == uv_async_init(uv_default_loop(), &handle, async_cb));
ACCESS_ONCE(const char*, handle.data) = running;
for (i = 0; i < nthreads; i++)
ASSERT(0 == uv_thread_create(tids + i, pummel, &handle));
time = uv_hrtime();
ASSERT(0 == uv_run(uv_default_loop(), UV_RUN_DEFAULT));
time = uv_hrtime() - time;
done = 1;
for (i = 0; i < nthreads; i++)
ASSERT(0 == uv_thread_join(tids + i));
printf("async_pummel_%d: %s callbacks in %.2f seconds (%s/sec)\n",
nthreads,
fmt(callbacks),
time / 1e9,
fmt(callbacks / (time / 1e9)));
free(tids);
MAKE_VALGRIND_HAPPY();
return 0;
}
BENCHMARK_IMPL(async_pummel_1) {
return test_async_pummel(1);
}
BENCHMARK_IMPL(async_pummel_2) {
return test_async_pummel(2);
}
BENCHMARK_IMPL(async_pummel_4) {
return test_async_pummel(4);
}
BENCHMARK_IMPL(async_pummel_8) {
return test_async_pummel(8);
}
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