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Use LW_SHARED in dsa.c where possible.

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Both dsa_get_total_size() and dsa_get_total_size_from_handle() take
an exclusive lock just to read a variable.  This commit reduces the
lock level to LW_SHARED in those functions.

Reviewed-by: Sami Imseih <samimseih@gmail.com>
Discussion: https://postgr.es/m/aS8fMzWs9e8iHxk2%40nathan
This commit is contained in:
Nathan Bossart 2025-12-02 16:40:23 -06:00
parent cbe04e5d72
commit a6d05c8193
1 changed files with 2 additions and 2 deletions
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4
src/backend/utils/mmgr/dsa.c
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@ -1043,7 +1043,7 @@ dsa_get_total_size(dsa_area *area)
{
size_t size;
LWLockAcquire(DSA_AREA_LOCK(area), LW_EXCLUSIVE);
LWLockAcquire(DSA_AREA_LOCK(area), LW_SHARED);
size = area->control->total_segment_size;
LWLockRelease(DSA_AREA_LOCK(area));
@ -1075,7 +1075,7 @@ dsa_get_total_size_from_handle(dsa_handle handle)
control = (dsa_area_control *) dsm_segment_address(segment);
LWLockAcquire(&control->lock, LW_EXCLUSIVE);
LWLockAcquire(&control->lock, LW_SHARED);
size = control->total_segment_size;
LWLockRelease(&control->lock);