//---------------------------------------------------------------------
// Mbox send handler
//
// handle mbox send trap
// mbox_send(mbox_t handle, int num_bytes, void *data)
//----------------------------------------------------------------------
static int TrapMboxSendHandler (uint32 *trapArgs, int sysMode)
{
mbox_t handle; // Holds handle to mailbox
char msg[MBOX_MAX_MESSAGE_LENGTH]; // Holds message in kernel space
char *usermessage = NULL; // Pointer to user-space message
int length=-1; // Holds length of message (in bytes)
// If we're not in system mode, we need to copy everything from the
// user-space virtual address to the kernel space address
if (!sysMode) {
// Get the arguments themselves into system space
// Argument 0: handle to mailbox
MemoryCopyUserToSystem (currentPCB, (trapArgs+0), &handle, sizeof(mbox_t));
// Argument 1: length of message (in bytes)
MemoryCopyUserToSystem (currentPCB, (trapArgs+1), &length, sizeof(int));
// Argument 2: pointer to message data
MemoryCopyUserToSystem (currentPCB, (trapArgs+2), &usermessage, sizeof(char *));
// Now copy message data from user space to kernel space
MemoryCopyUserToSystem (currentPCB, usermessage, msg, length);
} else {
// Already in kernel space, no address translation necessary
handle = (mbox_t)trapArgs[0];
length = (int)trapArgs[1];
bcopy ((void *)(trapArgs[2]), (void *)msg, length); // Copy message into local variable for simplicity
}
return MboxSend(handle, length, msg);
}
int XXp1(char *arg)
{
int i, result;
char buffer[20];
USLOSS_Console("XXp1(): started\n");
for (i = 0; i <= 1; i++) {
USLOSS_Console("XXp1(): sending message #%d to mailbox %d\n", i, mbox_id);
sprintf(buffer, "hello there, #%d", i);
result = MboxSend(mbox_id, buffer, strlen(buffer)+1);
USLOSS_Console("XXp1(): after send of message #%d, result = %d\n", i, result);
}
quit(-3);
return 0;
} /* XXp1 */
int XXp2(char *arg)
{
int result;
char buffer[20];
sprintf(buffer, "hello from %s", arg);
USLOSS_Console("%s(): sending message '%s' to mailbox %d, msg_size = %lu\n",
arg, buffer, mbox_id, strlen(buffer)+1);
result = MboxSend(mbox_id, buffer, strlen(buffer)+1);
USLOSS_Console("%s(): after send of message '%s', result = %d\n",
arg, buffer, result);
if (result == -3)
USLOSS_Console("%s(): zap'd by MboxSend() call\n", arg);
quit(-3);
return 0;
} /* XXp2 */
int XXp3(char *arg)
{
char buffer[100];
int i = 0, result, count;
USLOSS_Console("\nXXp3(): started\n");
count = 0;
while ( (result = MboxCondReceive(mbox_id, buffer, 100)) >= 0 ) {
USLOSS_Console("XXp3(): conditionally received message #%d ", i);
USLOSS_Console("from mailbox %d\n", mbox_id);
USLOSS_Console(" message = `%s'\n", buffer);
count++;
}
USLOSS_Console("XXp3(): After loop, result is negative; result = %d\n",
result);
USLOSS_Console("XXp3(): received %d hello messages from mailbox %d\n",
count, mbox_id);
MboxSend(pause_mbox, NULL, 0); // should release XXp1
count = 0;
while ( (result = MboxCondReceive(mbox_id, buffer, 100)) >= 0 ) {
USLOSS_Console("XXp3(): conditionally received message #%d ", i);
USLOSS_Console("from mailbox %d\n", mbox_id);
USLOSS_Console(" message = `%s', result = %d\n", buffer, result);
count++;
}
USLOSS_Console("XXp3(): After loop, result is negative; result = %d\n",
result);
USLOSS_Console("XXp3(): received %d good-bye messages from mailbox %d\n",
count, mbox_id);
quit(-4);
return 0;
} /* XXp3 */
