#include <nitro/os.h>
BOOL OS_SendMessage(
OSMessageQueue* mq ,
OSMessage msg ,
s32 flag );
This function inserts a message at the end of the specified message queue and makes it possible for threads waiting in the message queue to execute.
The reception threads execute in order of priority. If OS_MESSAGE_BLOCK is set in flag and the queue is full, the thread that called this function is stopped temporarily
but is restarted by running a reception thread and removing a message from the queue. Be aware that if there are transmission threads of higher priority, they will execute first and may fill up the queue.
In this case, this thread will again temporarily stop until an opening in the message queue is made by the reception thread.
When OS_MESSAGE_NOBLOCK is set in flag,
the called thread is returned to immediately. When the queue is not full,
TRUE is returned. If the queue is full, FALSE is returned.
mq |
Pointer to the message queue |
msg |
Transmission message |
flag |
When OS_MESSAGE_BLOCK is set, OS_SendMessage blocks when the queue is full.
When OS_MESSAGE_NOBLOCK is set, OS_SendMessage returns whether the queue is full or not. |
TRUE is returned when the message is successfully sent. FALSE is returned when the queue is full and OS_MESSAGE_NOBLOCK is specified.
OS_InitMessageQueue, OS_ReceiveMessage, OS_JamMessage
12/01/2003 Initial Version