void __wait(volatile int *addr, volatile int *waiters, int val, int priv)
{
int spins=10000;
if (priv) priv = 128; priv=0;
while (spins--) {
if (*addr==val) a_spin();
else return;
}
if (waiters) a_inc(waiters);
while (*addr==val) {
#ifdef __EMSCRIPTEN__
if (pthread_self()->cancelasync == PTHREAD_CANCEL_ASYNCHRONOUS) {
// Must wait in slices in case this thread is cancelled in between.
int e;
do {
if (_pthread_isduecanceled(pthread_self())) {
if (waiters) a_dec(waiters);
return;
}
e = emscripten_futex_wait((void*)addr, val, 100);
} while(e == -ETIMEDOUT);
} else {
// Can wait in one go.
emscripten_futex_wait((void*)addr, val, INFINITY);
}
#else
__syscall(SYS_futex, addr, FUTEX_WAIT|priv, val, 0);
#endif
}
if (waiters) a_dec(waiters);
}
static int do_wait(volatile int *addr, int val,
clockid_t clk, const struct timespec *at, int priv)
{
int r;
struct timespec to, *top=0;
if (at) {
if (at->tv_nsec >= 1000000000UL) return EINVAL;
if (clock_gettime(clk, &to)) return EINVAL;
to.tv_sec = at->tv_sec - to.tv_sec;
if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
to.tv_sec--;
to.tv_nsec += 1000000000;
}
if (to.tv_sec < 0) return ETIMEDOUT;
top = &to;
}
#ifdef __EMSCRIPTEN__
if (1 || pthread_self()->cancelasync == PTHREAD_CANCEL_ASYNCHRONOUS) {
do {
if (_pthread_isduecanceled(pthread_self())) {
// Emscripten-specific return value: The wait was canceled by user calling
// pthread_cancel() for this thread, and the caller needs to cooperatively
// cancel execution.
return ECANCELED;
}
// Must wait in slices in case this thread is cancelled in between.
double waitMsecs = at ? _pthread_msecs_until(at) : INFINITY;
if (waitMsecs <= 0) {
r = ETIMEDOUT;
break;
}
if (waitMsecs > 100) waitMsecs = 100;
r = -emscripten_futex_wait((void*)addr, val, waitMsecs);
// Assist other threads by executing proxied operations that are effectively singlethreaded.
if (emscripten_is_main_runtime_thread()) emscripten_main_thread_process_queued_calls();
} while(r == ETIMEDOUT);
} else {
// Can wait in one go.
double waitMsecs = at ? _pthread_msecs_until(at) : INFINITY;
r = -emscripten_futex_wait((void*)addr, val, waitMsecs);
}
#else
r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT, val, top);
#endif
if (r == EINTR || r == EINVAL || r == ETIMEDOUT) return r;
return 0;
}
EMSCRIPTEN_RESULT emscripten_fetch_wait(emscripten_fetch_t *fetch, double timeoutMsecs)
{
#if __EMSCRIPTEN_PTHREADS__
if (!fetch) return EMSCRIPTEN_RESULT_INVALID_PARAM;
uint32_t proxyState = emscripten_atomic_load_u32(&fetch->__proxyState);
if (proxyState == 2) return EMSCRIPTEN_RESULT_SUCCESS; // already finished.
if (proxyState != 1) return EMSCRIPTEN_RESULT_INVALID_PARAM; // the fetch should be ongoing?
// #ifdef FETCH_DEBUG
EM_ASM({ console.log('fetch: emscripten_fetch_wait..') });
// #endif
// TODO: timeoutMsecs is currently ignored. Return EMSCRIPTEN_RESULT_TIMED_OUT on timeout.
while(proxyState == 1/*sent to proxy worker*/)
{
emscripten_futex_wait(&fetch->__proxyState, proxyState, 100 /*TODO HACK:Sleep sometimes doesn't wake up?*/);//timeoutMsecs);
proxyState = emscripten_atomic_load_u32(&fetch->__proxyState);
}
// #ifdef FETCH_DEBUG
EM_ASM({ console.log('fetch: emscripten_fetch_wait done..') });
// #endif
if (proxyState == 2) return EMSCRIPTEN_RESULT_SUCCESS;
else return EMSCRIPTEN_RESULT_FAILED;
#else
EM_ASM({ console.error('fetch: emscripten_fetch_wait is not available when building without pthreads!') });
return EMSCRIPTEN_RESULT_FAILED;
#endif
}
int main()
{
if (!emscripten_has_threading_support())
{
#ifdef REPORT_RESULT
REPORT_RESULT(0);
#endif
printf("Skipped: Threading is not supported.\n");
return 0;
}
pthread_t thread;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
int rc = pthread_create(&thread, &attr, ThreadMain, 0);
assert(rc == 0);
rc = emscripten_futex_wait(&main_thread_wait_val, 1, 15 * 1000);
if (rc != 0)
{
printf("ERROR! futex wait timed out!\n");
result = 2;
#ifdef REPORT_RESULT
REPORT_RESULT(result);
#endif
exit(1);
}
pthread_attr_destroy(&attr);
pthread_join(thread, 0);
#ifdef REPORT_RESULT
REPORT_RESULT(result);
#endif
}
void *mandelbrot_thread(void *arg)
{
int idx = (int)arg;
for(;;)
{
emscripten_futex_wait(&tasksPending[idx], 0, INFINITY);
emscripten_atomic_store_u32(&tasksPending[idx], 0);
double t0 = emscripten_get_now();
int ni;
if (use_sse)
ni = ComputeMandelbrot_SSE(mandelReal, mandelImag, outputImage, sizeof(float)*W, sizeof(uint32_t)*W, 0, idx, numTasks, W, H, left, top, incrX, incrY, numItersDoneOnCanvas, numItersPerFrame);
else
ni = ComputeMandelbrot(mandelReal, mandelImag, outputImage, sizeof(float)*W, sizeof(uint32_t)*W, 0, idx, numTasks, W, H, left, top, incrX, incrY, numItersDoneOnCanvas, numItersPerFrame);
//emscripten_atomic_add_u32(&numIters, ni);
double t1 = emscripten_get_now();
numIters[idx] += ni;
timeSpentInMandelbrot[idx] += t1-t0;
emscripten_atomic_add_u32(&tasksDone, 1);
emscripten_futex_wake(&tasksDone, 9999);
}
}
