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Implemented the 'try' in sys_mbox_trypost (returning ERR_MEM if the mbox is full).

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This commit is contained in:
goldsimon 2008-01-06 14:16:12 +00:00
parent 5652c7d473
commit cd55e0b82b
1 changed files with 18 additions and 4 deletions
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22
ports/win32/sys_arch.c
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@ -42,6 +42,12 @@
#include <lwip/debug.h>
#include <lwip/sys.h>
int MySleep(DWORD x)
{
Sleep(x);
return 0;
}
/* These functions are used from NO_SYS also, for precise timer triggering */
LARGE_INTEGER freq, sys_start_time;
@ -331,6 +337,7 @@ void sys_mbox_post(sys_mbox_t q, void *msg)
err_t sys_mbox_trypost(sys_mbox_t q, void *msg)
{
u32_t new_head;
DWORD ret;
SYS_ARCH_DECL_PROTECT(lev);
@ -340,11 +347,18 @@ err_t sys_mbox_trypost(sys_mbox_t q, void *msg)
LWIP_ASSERT("q->sem != INVALID_HANDLE_VALUE", q->sem != INVALID_HANDLE_VALUE);
SYS_ARCH_PROTECT(lev);
q->q_mem[q->head] = msg;
(q->head)++;
if (q->head >= MAX_QUEUE_ENTRIES) {
q->head = 0;
new_head = q->head + 1;
if (new_head >= MAX_QUEUE_ENTRIES) {
new_head = 0;
}
if (new_head == q->tail) {
SYS_ARCH_UNPROTECT(lev);
return ERR_MEM;
}
q->q_mem[q->head] = msg;
q->head = new_head;
LWIP_ASSERT("mbox is full!", q->head != q->tail);
ret = ReleaseSemaphore(q->sem, 1, 0);
LWIP_ASSERT("Error releasing sem", ret != 0);