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62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
// This code is in the public domain -- Ignacio Castaño <castano@gmail.com>
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#include "ParallelFor.h"
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#include "Thread.h"
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#include "Atomic.h"
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#include "ThreadPool.h"
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#include "nvcore/Utils.h" // toI32
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using namespace nv;
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#define ENABLE_PARALLEL_FOR 1
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static void worker(void * arg, int tid) {
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ParallelFor * owner = (ParallelFor *)arg;
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while(true) {
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uint new_idx = atomicFetchAndAdd(&owner->idx, owner->step);
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if (new_idx >= owner->count) {
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break;
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}
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const uint count = min(owner->count, new_idx + owner->step);
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for (uint i = new_idx; i < count; i++) {
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owner->task(owner->context, /*tid, */i);
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}
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}
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}
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ParallelFor::ParallelFor(ForTask * task, void * context) : task(task), context(context) {
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#if ENABLE_PARALLEL_FOR
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pool = ThreadPool::acquire();
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#endif
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}
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ParallelFor::~ParallelFor() {
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#if ENABLE_PARALLEL_FOR
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ThreadPool::release(pool);
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#endif
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}
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void ParallelFor::run(uint count, uint step/*= 1*/) {
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#if ENABLE_PARALLEL_FOR
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storeRelease(&this->count, count);
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storeRelease(&this->step, step);
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// Init atomic counter to zero.
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storeRelease(&idx, 0);
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// Start threads.
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pool->run(worker, this);
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nvDebugCheck(idx >= count);
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#else
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for (int i = 0; i < toI32(count); i++) {
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task(context, i);
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}
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#endif
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}
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