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sem_rw: optimize up_read/up_write API

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This change optimizes the reader-writer semaphore release process by consolidating
redundant context switch operations and improving code efficiency, reducing
unnecessary wake-ups during concurrent access scenarios.

Signed-off-by: Yongrong Wang <wangyongrong@xiaomi.com>
This commit is contained in:
Yongrong Wang
2025-01-09 20:26:25 +08:00
committed by Xiang Xiao
parent 7113b61b1d
commit 53e9c5b986
1 changed files with 3 additions and 5 deletions
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sched/semaphore/sem_rw.c
+3 -5
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@@ -169,6 +169,7 @@ void up_read(FAR rw_semaphore_t *rwsem)
if (--rwsem->writer <= 0) if (--rwsem->writer <= 0)
{ {
rwsem->holder = RWSEM_NO_HOLDER; rwsem->holder = RWSEM_NO_HOLDER;
up_wait(rwsem);
} }
goto out; goto out;
@@ -176,9 +177,7 @@ void up_read(FAR rw_semaphore_t *rwsem)
DEBUGASSERT(rwsem->reader > 0); DEBUGASSERT(rwsem->reader > 0);
rwsem->reader--; if (--rwsem->reader <= 0)
if (rwsem->waiter > 0)
{ {
up_wait(rwsem); up_wait(rwsem);
} }
@@ -281,9 +280,8 @@ void up_write(FAR rw_semaphore_t *rwsem)
if (--rwsem->writer <= 0) if (--rwsem->writer <= 0)
{ {
rwsem->holder = RWSEM_NO_HOLDER; rwsem->holder = RWSEM_NO_HOLDER;
}
up_wait(rwsem); up_wait(rwsem);
}
nxmutex_unlock(&rwsem->protected); nxmutex_unlock(&rwsem->protected);
} }