Add unlikely() to CHECK_FOR_INTERRUPTS()

Add the unlikely() branch hint macro to CHECK_FOR_INTERRUPTS().
Backpatch to REL_10_STABLE where we first started using unlikely().

Discussion: https://www.postgresql.org/message-id/flat/8692553c-7fe8-17d9-cbc1-7cddb758f4c6%40joeconway.com

diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index 14fa127ab118aaa2f917fd02481c9b709b378c5e..18bc8a7b9045ca80802ae740a4e122e87e1abdda 100644 (file)
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -98,16 +98,16 @@ extern void ProcessInterrupts(void);
 
 #define CHECK_FOR_INTERRUPTS() \
 do { \
-   if (InterruptPending) \
+   if (unlikely(InterruptPending)) \
        ProcessInterrupts(); \
 } while(0)
 #else                          /* WIN32 */
 
 #define CHECK_FOR_INTERRUPTS() \
 do { \
-   if (UNBLOCKED_SIGNAL_QUEUE()) \
+   if (unlikely(UNBLOCKED_SIGNAL_QUEUE())) \
        pgwin32_dispatch_queued_signals(); \
-   if (InterruptPending) \
+   if (unlikely(InterruptPending)) \
        ProcessInterrupts(); \
 } while(0)
 #endif                         /* WIN32 */