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Fix T48422: Revert "BLI_task: nano-optimizations to BLI_task_parallel_range feature."

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There are some serious issues under windows, causing deadlocks somehow (not reproducible under linux so far).

Until further investigation over why this happens, better to revert to previous
spin-locked behavior.

This reverts commits a83bc4f59707ab and 98123ae9168.
This commit is contained in:
Bastien Montagne 2016-05-15 21:11:36 +02:00
parent 23bdcfe560
commit bb7da630ba
1 changed files with 17 additions and 21 deletions
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38
source/blender/blenlib/intern/task.c
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@ -776,29 +776,23 @@ typedef struct ParallelRangeState {
int iter;
int chunk_size;
SpinLock lock;
} ParallelRangeState;
BLI_INLINE bool parallel_range_next_iter_get(
ParallelRangeState * __restrict state,
int * __restrict iter, int * __restrict count)
{
uint32_t n, olditer, previter, newiter;
if (UNLIKELY(state->iter >= state->stop)) {
return false;
bool result = false;
BLI_spin_lock(&state->lock);
if (state->iter < state->stop) {
*count = min_ii(state->chunk_size, state->stop - state->iter);
*iter = state->iter;
state->iter += *count;
result = true;
}
do {
olditer = state->iter;
n = min_ii(state->chunk_size, state->stop - olditer);
newiter = olditer + n;
previter = atomic_cas_uint32((uint32_t *)&state->iter, olditer, newiter);
} while (UNLIKELY(previter != olditer));
*iter = previter;
*count = n;
return (n != 0);
BLI_spin_unlock(&state->lock);
return result;
}
static void parallel_range_func(
@ -903,6 +897,7 @@ static void task_parallel_range_ex(
*/
num_tasks = num_threads * 2;
BLI_spin_init(&state.lock);
state.start = start;
state.stop = stop;
state.userdata = userdata;
@ -921,15 +916,16 @@ static void task_parallel_range_ex(
num_tasks = min_ii(num_tasks, (stop - start) / state.chunk_size);
for (i = 0; i < num_tasks; i++) {
/* Use this pool's pre-allocated tasks. */
BLI_task_pool_push_from_thread(task_pool,
parallel_range_func,
NULL, false,
TASK_PRIORITY_HIGH, 0);
BLI_task_pool_push(task_pool,
parallel_range_func,
NULL, false,
TASK_PRIORITY_HIGH);
}
BLI_task_pool_work_and_wait(task_pool);
BLI_task_pool_free(task_pool);
BLI_spin_end(&state.lock);
}
/**