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Apply SpacesAvailable() fix

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Original author: RichardBarry
This commit is contained in:
Miles Frain 2021-02-22 21:27:26 -08:00
parent 4223fd5326
commit 1e4aab6d40
1 changed files with 11 additions and 3 deletions
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14
stream_buffer.c
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@ -280,7 +280,7 @@ static void prvInitialiseNewStreamBuffer( StreamBuffer_t * const pxStreamBuffer,
{
pucAllocatedMemory = NULL;
}
if( pucAllocatedMemory != NULL )
{
@ -497,11 +497,19 @@ size_t xStreamBufferSpacesAvailable( StreamBufferHandle_t xStreamBuffer )
{
const StreamBuffer_t * const pxStreamBuffer = xStreamBuffer;
size_t xSpace;
volatile size_t xOriginalTail;
configASSERT( pxStreamBuffer );
xSpace = pxStreamBuffer->xLength + pxStreamBuffer->xTail;
xSpace -= pxStreamBuffer->xHead;
/* The code below reads xTail and then xHead. This is safe if the stream
buffer is updated once between the two reads - but not if the stream buffer
is updated more than once between the two reads - hence the loop. */
do
{
xOriginalTail = pxStreamBuffer->xTail;
xSpace = pxStreamBuffer->xLength + pxStreamBuffer->xTail;
xSpace -= pxStreamBuffer->xHead;
} while( xOriginalTail != pxStreamBuffer->xTail );
xSpace -= ( size_t ) 1;
if( xSpace >= pxStreamBuffer->xLength )