/*****************************************************************************************
Copyright (c) 2002-2004 The UbixOS Project
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of
conditions, the following disclaimer and the list of authors. Redistributions in binary
form must reproduce the above copyright notice, this list of conditions, the following
disclaimer and the list of authors in the documentation and/or other materials provided
with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
$Id$
*****************************************************************************************/
#include <mpi/mpi.h>
#include <lib/kmalloc.h>
#include <lib/string.h>
#include <ubixos/spinlock.h>
static mpi_mbox_t *mboxList = 0x0;
static spinLock_t mpiSpinLock = SPIN_LOCK_INITIALIZER;
/*****************************************************************************************
Function: static mpiMbox_t * mpiFindMbox(char *name)
Description: This function will find a mail box that matches the supplied name
Notes:
*****************************************************************************************/
static mpi_mbox_t * mpi_findMbox(char *name) {
mpi_mbox_t *mbox = 0x0;
for (mbox = mboxList;mbox;mbox = mbox->next) {
if (!strcmp(mbox->name,name)) {
spinUnlock(&mpiSpinLock);
return(mbox);
}
}
return(0x0);
}
/*****************************************************************************************
Function: int mpiCreateMbox(char *name)
Description: This function will create a new mailbox if it fails it will return -1
otherwise it returns 0x0
Notes:
*****************************************************************************************/
int mpi_createMbox(char *name) {
mpi_mbox_t *mbox = 0x0;
spinLock(&mpiSpinLock);
if (mpi_findMbox(name) != 0x0) {
spinUnlock(&mpiSpinLock);
return(-1);
}
mbox = (mpi_mbox_t *)kmalloc(sizeof(mpi_mbox_t));
sprintf(mbox->name,name);
mbox->pid = _current->id;
if (mboxList == 0x0) {
mbox->prev = 0x0;
mbox->next = 0x0;
mboxList = mbox;
}
else {
mbox->next = mboxList;
mbox->prev = 0x0;
mboxList->prev = mbox;
mboxList = mbox;
}
spinUnlock(&mpiSpinLock);
return(0x0);
}
/*****************************************************************************************
Function: int mpiSpam(uInt32 type,void *data)
Description: This function will send a message to every mailbox
Notes:
*****************************************************************************************/
int mpi_spam(uInt32 type,void *data) {
mpi_mbox_t *mbox = 0x0;
mpi_message_t *message = 0x0;
spinLock(&mpiSpinLock);
for (mbox = mboxList;mbox;mbox = mbox->next) {
message = (mpi_message_t *)kmalloc(sizeof(mpi_message_t));
message->header = type;
memcpy(message->data,data,MESSAGE_LENGTH);
message->next = 0x0;
if (mbox->msg == 0x0) {
mbox->msg = message;
}
else {
mbox->msgLast->next = message;
mbox->msgLast = message;
}
}
spinUnlock(&mpiSpinLock);
return(0x0);
}
/*****************************************************************************************
Function: int mpiPostMessage(char *name,uInt32 type,void *data)
Description: This function will post a message to specified mailbox
Notes:
*****************************************************************************************/
int mpi_postMessage(char *name,uInt32 type,mpi_message_t *msg) {
mpi_mbox_t *mbox = 0x0;
mpi_message_t *message = 0x0;
spinLock(&mpiSpinLock);
mbox = mpi_findMbox(name);
if (mbox == 0x0) {
spinUnlock(&mpiSpinLock);
return(0x1);
}
message = (mpi_message_t *)kmalloc(sizeof(mpi_message_t));
message->header = msg->header;
memcpy(message->data,msg->data,MESSAGE_LENGTH);
message->pid = _current->id;
message->next = 0x0;
if (mbox->msg == 0x0) {
mbox->msg = message;
}
else {
mbox->msgLast->next = message;
mbox->msgLast = message;
}
spinUnlock(&mpiSpinLock);
if (type == 0x2) {
while (mbox->msgLast != 0x0);
}
return(0x0);
}
/*****************************************************************************************
Function: int mpiFetchMessage(char *name,mpiMessage_t *msg)
Description: This function will fetch the next message out of the specified mailbox
Notes:
*****************************************************************************************/
int mpi_fetchMessage(char *name,mpi_message_t *msg) {
mpi_mbox_t *mbox = 0x0;
mpi_message_t *tmpMsg = 0x0;
spinLock(&mpiSpinLock);
mbox = mpi_findMbox(name);
if (mbox == 0x0) {
spinUnlock(&mpiSpinLock);
return(-1);
}
if (mbox->msg == 0x0) {
spinUnlock(&mpiSpinLock);
return(-1);
}
if (mbox->pid != _current->id) {
spinUnlock(&mpiSpinLock);
return(-1);
}
msg->header = mbox->msg->header;
memcpy(msg->data,mbox->msg->data,MESSAGE_LENGTH);
msg->pid = mbox->msg->pid;
tmpMsg = mbox->msg;
mbox->msg = mbox->msg->next;
kfree(tmpMsg);
spinUnlock(&mpiSpinLock);
return(0x0);
}
/*****************************************************************************************
Function: int mpiDestroyMbox(char *name)
Description: This function will fetch the next message out of the specified mailbox
Notes:
*****************************************************************************************/
int mpi_destroyMbox(char *name) {
mpi_mbox_t *mbox = 0x0;
spinLock(&mpiSpinLock);
for (mbox = mboxList;mbox;mbox=mbox->next) {
if (!strcmp(mbox->name,name)) {
if (mbox->pid != _current->id) {
spinUnlock(&mpiSpinLock);
return(-1);
}
mbox->prev->next = mbox->next;
mbox->next->prev = mbox->prev;
kfree(mbox);
spinUnlock(&mpiSpinLock);
return(0x0);
}
}
spinUnlock(&mpiSpinLock);
return(-1);
}
/***
$Log$
Revision 1.3 2004/08/21 23:47:50 reddawg
*** empty log message ***
Revision 1.2 2004/08/14 11:23:02 reddawg
Changes
Revision 1.1 2004/07/28 17:07:25 reddawg
MPI: moved the syscalls
Revision 1.10 2004/06/28 23:12:58 reddawg
file format now container:/path/to/file
Revision 1.9 2004/05/26 15:34:29 reddawg
mpi: oops forgot a spinUnlock
Revision 1.8 2004/05/26 11:58:37 reddawg
mpi: Fixed security now the pid used at time of mpiCreateMbox is the only pid
allowed to do mpiFetchMessage and mpiDestroyMbox against that mail box
Revision 1.7 2004/05/25 22:25:39 reddawg
Typo Fix
Revision 1.6 2004/05/25 18:32:02 reddawg
Made MESSAGE_LENGTH define instead of hard coded message size
Revision 1.4 2004/05/25 16:52:22 reddawg
We now have mpiDestroyMbox(char *) This will of course destroy a mail box
Revision 1.3 2004/05/25 16:33:26 reddawg
Added some basic documentation
Revision 1.2 2004/05/25 15:42:18 reddawg
Enabled mpiSpam();
Revision 1.1 2004/05/25 14:03:22 reddawg
First insertion of the MPI into our kernel
END
***/
