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comments and reordering for atomic fencing on dsp filter

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This commit is contained in:
Paul Davis 2023-02-19 21:58:22 -07:00
parent 28d244bd0a
commit 9e4d7e3224
1 changed files with 7 additions and 1 deletions
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8
libs/ardour/ardour/dsp_filter.h
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@ -113,8 +113,11 @@ namespace ARDOUR { namespace DSP {
* @param val value to set
*/
void atomic_set_int (size_t off, int32_t val) {
((int32_t*)_data)[off] = val;
/* no read or write that precedes the write we are
about to do can be reordered past this fence.
*/
std::atomic_thread_fence (std::memory_order_release);
((int32_t*)_data)[off] = val;
}
/** atomically read integer at offset
@ -127,6 +130,9 @@ namespace ARDOUR { namespace DSP {
* @returns value at offset
*/
int32_t atomic_get_int (size_t off) {
/* no read that precedes the read we are
about to do can be reordered past this fence.
*/
std::atomic_thread_fence (std::memory_order_acquire);
return (((int32_t*)_data)[off]);
}