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fix mailbox offset overflow

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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1486 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
mbbill@gmail.com 2011-06-10 06:04:06 +00:00
parent 3077aea698
commit 8cae5c147f
1 changed files with 3 additions and 3 deletions
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6
src/ipc.c
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@ -1278,7 +1278,7 @@ rt_mailbox_t rt_mb_create (const char* name, rt_size_t size, rt_uint8_t flag)
* @return the error code
*/
rt_err_t rt_mb_delete (rt_mailbox_t mb)
{
{
/* parameter check */
RT_ASSERT(mb != RT_NULL);
@ -1398,7 +1398,7 @@ rt_err_t rt_mb_send_wait (rt_mailbox_t mb, rt_uint32_t value, rt_int32_t timeout
mb->msg_pool[mb->in_offset] = value;
/* increase input offset */
++ mb->in_offset;
if (mb->in_offset > mb->size) mb->in_offset = 0;
if (mb->in_offset >= mb->size) mb->in_offset = 0;
/* increase message entry */
mb->entry ++;
@ -1529,7 +1529,7 @@ rt_err_t rt_mb_recv (rt_mailbox_t mb, rt_uint32_t* value, rt_int32_t timeout)
/* increase output offset */
++mb->out_offset;
if (mb->out_offset > mb->size) mb->out_offset = 0;
if (mb->out_offset >= mb->size) mb->out_offset = 0;
/* decrease message entry */
mb->entry --;