sergiotarxz/nuttx
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

arch/spinlock: implement the default test-and-set semantics

Browse Source 
use the default testset implement on single core platform
that does not support test-and-set, more flexibility for
SMP drivers(using spinlock) if configured in a single-core mode.

Signed-off-by: chao.an <anchao@xiaomi.com>
This commit is contained in:
chao.an 2020-12-30 14:24:51 +08:00 committed by Xiang Xiao
parent 7592fc17d3
commit 1241f910ce
2 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
include/nuttx/spinlock.h
View File

@ -128,7 +128,28 @@
* *
****************************************************************************/ ****************************************************************************/
#if defined(CONFIG_ARCH_HAVE_TESTSET)
spinlock_t up_testset(volatile FAR spinlock_t *lock); spinlock_t up_testset(volatile FAR spinlock_t *lock);
#elif !defined(CONFIG_SMP)
static inline spinlock_t up_testset(volatile FAR spinlock_t *lock)
{
irqstate_t flags;
spinlock_t ret;
flags = up_irq_save();
ret = *lock;
if (ret == SP_UNLOCKED)
{
*lock = SP_LOCKED;
}
up_irq_restore(flags);
return ret;
}
#endif
/**************************************************************************** /****************************************************************************
* Name: spin_initialize * Name: spin_initialize

2
sched/Kconfig
View File

@ -232,7 +232,6 @@ menu "Tasks and Scheduling"
config SPINLOCK config SPINLOCK
bool "Support Spinlocks" bool "Support Spinlocks"
default n default n
depends on ARCH_HAVE_TESTSET
---help--- ---help---
Enables support for spinlocks. Spinlocks are used primarily for Enables support for spinlocks. Spinlocks are used primarily for
synchronization in SMP configurations but are available for general synchronization in SMP configurations but are available for general
@ -275,6 +274,7 @@ config SMP
bool "Symmetric Multi-Processing (SMP)" bool "Symmetric Multi-Processing (SMP)"
default n default n
depends on ARCH_HAVE_MULTICPU depends on ARCH_HAVE_MULTICPU
depends on ARCH_HAVE_TESTSET
select SPINLOCK select SPINLOCK
select SCHED_RESUMESCHEDULER select SCHED_RESUMESCHEDULER
select IRQCOUNT select IRQCOUNT