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Fix RunQueue race condition on weak memory architectures (ARM64)

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libeigen/eigen!2121
This commit is contained in:
Antonio Sánchez
2026-02-06 02:27:08 +00:00
committed by Charles Schlosser
parent c648296368
commit afb4380534
1 changed files with 5 additions and 5 deletions
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10
Eigen/src/ThreadPool/RunQueue.h
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@@ -57,7 +57,7 @@ class RunQueue {
Elem* e = &array_[front & kMask];
uint8_t s = e->state.load(std::memory_order_relaxed);
if (s != kEmpty || !e->state.compare_exchange_strong(s, kBusy, std::memory_order_acquire)) return w;
front_.store(front + 1 + (kSize << 1), std::memory_order_relaxed);
front_.store(front + 1 + (kSize << 1), std::memory_order_release);
e->w = std::move(w);
e->state.store(kReady, std::memory_order_release);
return Work();
@@ -73,7 +73,7 @@ class RunQueue {
Work w = std::move(e->w);
e->state.store(kEmpty, std::memory_order_release);
front = ((front - 1) & kMask2) | (front & ~kMask2);
front_.store(front, std::memory_order_relaxed);
front_.store(front, std::memory_order_release);
return w;
}
@@ -86,7 +86,7 @@ class RunQueue {
uint8_t s = e->state.load(std::memory_order_relaxed);
if (s != kEmpty || !e->state.compare_exchange_strong(s, kBusy, std::memory_order_acquire)) return w;
back = ((back - 1) & kMask2) | (back & ~kMask2);
back_.store(back, std::memory_order_relaxed);
back_.store(back, std::memory_order_release);
e->w = std::move(w);
e->state.store(kReady, std::memory_order_release);
return Work();
@@ -102,7 +102,7 @@ class RunQueue {
if (s != kReady || !e->state.compare_exchange_strong(s, kBusy, std::memory_order_acquire)) return Work();
Work w = std::move(e->w);
e->state.store(kEmpty, std::memory_order_release);
back_.store(back + 1 + (kSize << 1), std::memory_order_relaxed);
back_.store(back + 1 + (kSize << 1), std::memory_order_release);
return w;
}
@@ -132,7 +132,7 @@ class RunQueue {
e->state.store(kEmpty, std::memory_order_release);
n++;
}
if (n != 0) back_.store(start + 1 + (kSize << 1), std::memory_order_relaxed);
if (n != 0) back_.store(start + 1 + (kSize << 1), std::memory_order_release);
return n;
}