xiaoxiang781216 commented on code in PR #15198:
URL: https://github.com/apache/nuttx/pull/15198#discussion_r1886600605
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libs/libc/misc/lib_pathbuffer.c:
##########
@@ -82,22 +80,24 @@ static struct pathbuffer_s g_pathbuffer =
FAR char *lib_get_pathbuffer(void)
{
- irqstate_t flags;
- int index;
-
- /* Try to find a free buffer */
-
- flags = spin_lock_irqsave(&g_pathbuffer.lock);
- index = ffsl(g_pathbuffer.free_bitmap) - 1;
- if (index >= 0 && index < CONFIG_LIBC_PATHBUFFER_MAX)
+ for (; ; )
{
- g_pathbuffer.free_bitmap &= ~(1u << index);
- spin_unlock_irqrestore(&g_pathbuffer.lock, flags);
- return g_pathbuffer.buffer[index];
+ int32_t free_bitmap = atomic_read(&g_pathbuffer.free_bitmap);
+ int index = ffsl(free_bitmap) - 1;
+ if (index < 0 || index >= CONFIG_LIBC_PATHBUFFER_MAX)
+ {
+ break;
+ }
+
+ int32_t update;
Review Comment:
move to the beginning of loop
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