/*
* SysApi recv
* 参数：无
* 功能：接受消息，如果没有消息则睡眠自己
* 返回值：消息头
*/
MsgHead recv()
{
KernelLock();
int priority = 10; // -12
int id;
Bool empty = True; // -20
/* 循环等待接收消息 */
for(int i=0;i<THREAD_NR_MSGQUEUE/32;i++) // -24
{
empty = empty && (thread_run->thread_info.msg_queue_bmp[i] == 0);
}
if (empty)
{
thread_run->thread_info.state = THREAD_STATE_RECVING;
KernelUnlock();
wait();
}
/* 选择优先级最高的消息 */
for(int i=0;i<THREAD_NR_MSGQUEUE;i++)
{
if(bmp_test((void*)&thread_run->thread_info.msg_queue_bmp,i))
{
/* 获取消息指针 */
MsgHead *msg = &thread_run->thread_info.msg_queue[i];
/* 如果消息的优先级已最高 */
if(msg->priority == 0)
{
bmp_clear((void*)&thread_run->thread_info.msg_queue_bmp,i);
return *msg;
}
/* 选择较高优先级的消息 */
if(msg->priority < priority)
{
id = i;
priority = msg->priority;
}
}
}
bmp_clear((void*)&thread_run->thread_info.msg_queue_bmp,id);
KernelUnlock();
return thread_run->thread_info.msg_queue[id];
}
int stbi_bmp_test_memory (stbi_uc const *buffer, int len)
{
stbi s;
start_mem(&s, buffer, len);
return bmp_test(&s);
}
