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bench: squelch -Wstrict-aliasing warnings

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This commit is contained in:
Ben Noordhuis 2012-11-09 03:51:47 +01:00
parent d6b7fe0e3b
commit bef3ea4818
1 changed files with 11 additions and 6 deletions
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17
test/benchmark-async-pummel.c
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@ -25,19 +25,24 @@
#include <stdio.h>
#include <stdlib.h>
#define NUM_PINGS (1000 * 1000)
#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, int status) {
if (++callbacks == NUM_PINGS) {
/* Tell the pummel thread to stop. */
handle->data = (void*) (intptr_t) 1;
ACCESS_ONCE(const char*, handle->data) = stop;
/* Wait for for the pummel thread to acknowledge that it has stoppped. */
while (*(volatile intptr_t*) &handle->data < 2)
while (ACCESS_ONCE(const char*, handle->data) != stopped)
uv_sleep(0);
uv_close((uv_handle_t*) handle, NULL);
@ -48,11 +53,11 @@ static void async_cb(uv_async_t* handle, int status) {
static void pummel(void* arg) {
uv_async_t* handle = (uv_async_t*) arg;
while (*(volatile intptr_t*) &handle->data == 0)
while (ACCESS_ONCE(const char*, handle->data) == running)
uv_async_send(handle);
/* Acknowledge that we've seen handle->data change. */
handle->data = (void*) (intptr_t) 2;
ACCESS_ONCE(const char*, handle->data) = stopped;
}
@ -66,7 +71,7 @@ static int test_async_pummel(int nthreads) {
ASSERT(tids != NULL);
ASSERT(0 == uv_async_init(uv_default_loop(), &handle, async_cb));
handle.data = NULL;
ACCESS_ONCE(const char*, handle.data) = running;
for (i = 0; i < nthreads; i++)
ASSERT(0 == uv_thread_create(tids + i, pummel, &handle));