void *ThreadMain(void *arg)
{
for(int i = 0; i < 10; ++i)
{
char str[256];
sprintf(str, "file%d.txt", i);
printf("Writing file %s..\n", str); // Prints out to page console, this is a proxied operation.
FILE *handle = fopen(str, "w"); // fopen, fputs and fclose are currently proxied operations too (although hopefully not in the future)
fputs(str, handle);
fclose(handle);
}
emscripten_atomic_store_u32(&main_thread_wait_val, 0);
emscripten_futex_wake(&main_thread_wait_val, 1);
emscripten_atomic_store_u32(&result, 0);
pthread_exit(0);
}
static inline void unlock_requeue(volatile int *l, volatile int *r, int w)
{
a_store(l, 0);
#ifdef __EMSCRIPTEN__
// Here the intent is to wake one waiter, and requeue all other waiters from waiting on address 'l'
// to wait on address 'r' instead. This is not possible at the moment with SharedArrayBuffer Atomics,
// as it does not have a "wake X waiters and requeue the rest" primitive. However this kind of
// primitive is strictly not needed, since it is more like an optimization to avoid spuriously waking
// all waiters, just to make them wait on another location immediately afterwards. Here we do exactly
// that: wake every waiter.
emscripten_futex_wake(l, 0x7FFFFFFF);
#else
if (w) __wake(l, 1, 1);
else __syscall(SYS_futex, l, FUTEX_REQUEUE|128, 0, 1, r) != -ENOSYS
|| __syscall(SYS_futex, l, FUTEX_REQUEUE, 0, 1, r);
#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);
}
}