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Adds std::atomic_thread_fences, but these seem not to be a magic bullet.

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This commit is contained in:
Thomas Harte 2020-09-15 16:34:34 -04:00
parent 82dbdf7dfc
commit 2fd5cc056c
1 changed files with 2 additions and 0 deletions
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2
Outputs/ScanTargets/BufferingScanTarget.cpp
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@ -242,6 +242,7 @@ void BufferingScanTarget::announce(Event event, bool is_visible, const Outputs::
write_pointers_.line = uint16_t((write_pointers_.line + 1) % line_buffer_size_);
// Update the submit pointers with all lines, scans and data written during this line.
std::atomic_thread_fence(std::memory_order::memory_order_release);
submit_pointers_.store(write_pointers_, std::memory_order::memory_order_release);
} else {
// Something failed, or there was nothing on the line anyway, so reset all pointers to where they
@ -299,6 +300,7 @@ BufferingScanTarget::OutputArea BufferingScanTarget::get_output_area() {
// cleared for submission.
const auto submit_pointers = submit_pointers_.load(std::memory_order::memory_order_acquire);
const auto read_ahead_pointers = read_ahead_pointers_.load(std::memory_order::memory_order_relaxed);
std::atomic_thread_fence(std::memory_order::memory_order_acquire);
OutputArea area;