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addrenv/addrenv.c: Use atomic_ functions to handle the reference counter

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The performance penalty in SMP mode is too big for taking the big kernel
lock simply to bump the address environment reference counter; fix this
by using the compiler provided atomic macros.
This commit is contained in:
Ville Juven
2024-11-14 15:35:48 +02:00
committed by Xiang Xiao
parent bd7074460c
commit e2616e7866
1 changed files with 3 additions and 11 deletions
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sched/addrenv/addrenv.c
+3 -11
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@@ -30,6 +30,7 @@
#include <debug.h> #include <debug.h>
#include <nuttx/addrenv.h> #include <nuttx/addrenv.h>
#include <nuttx/atomic.h>
#include <nuttx/irq.h> #include <nuttx/irq.h>
#include <nuttx/sched.h> #include <nuttx/sched.h>
#include <nuttx/wqueue.h> #include <nuttx/wqueue.h>
@@ -400,9 +401,7 @@ int addrenv_restore(FAR struct addrenv_s *addrenv)
void addrenv_take(FAR struct addrenv_s *addrenv) void addrenv_take(FAR struct addrenv_s *addrenv)
{ {
irqstate_t flags = enter_critical_section(); atomic_fetch_add(&addrenv->refs, 1);
addrenv->refs++;
leave_critical_section(flags);
} }
/**************************************************************************** /****************************************************************************
@@ -422,14 +421,7 @@ void addrenv_take(FAR struct addrenv_s *addrenv)
int addrenv_give(FAR struct addrenv_s *addrenv) int addrenv_give(FAR struct addrenv_s *addrenv)
{ {
irqstate_t flags; return atomic_fetch_sub(&addrenv->refs, 1);
int refs;
flags = enter_critical_section();
refs = --addrenv->refs;
leave_critical_section(flags);
return refs;
} }
/**************************************************************************** /****************************************************************************