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driver: Post sempahore only when it's value is smaller than one

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to avoid waking up the waiting thread redundantly.

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
This commit is contained in:
Xiang Xiao
2024-04-21 23:47:54 +08:00
committed by Xiang Xiao
parent c86f4d66da
commit a5aea61537
3 changed files with 3 additions and 5 deletions
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drivers/ipcc/ipcc_read.c
+1 -2
View File
@@ -90,11 +90,10 @@ void ipcc_rxfree_notify(FAR struct ipcc_driver_s *priv)
/* Notify all blocked readers that data is available to read */
do
while (nxsem_get_value(&priv->rxsem, &semval) >= 0 && semval <= 0)
{
nxsem_post(&priv->rxsem);
}
while (nxsem_get_value(&priv->rxsem, &semval) == 0 && semval <= 0);
}
/****************************************************************************
drivers/ipcc/ipcc_write.c
+1 -2
View File
@@ -90,11 +90,10 @@ void ipcc_txfree_notify(FAR struct ipcc_driver_s *priv)
/* Notify all blocked writers that data is available to write */
do
while (nxsem_get_value(&priv->txsem, &semval) >= 0 && semval <= 0)
{
nxsem_post(&priv->txsem);
}
while (nxsem_get_value(&priv->txsem, &semval) == 0 && semval <= 0);
}
/****************************************************************************