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/* ccapi/server/ccs_lock.c */
/*
* Copyright 2006 Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "ccs_common.h"
struct ccs_lock_d {
cc_uint32 type;
ccs_lock_state_t lock_state_owner;
ccs_callback_t callback;
};
struct ccs_lock_d ccs_lock_initializer = { 0, NULL, NULL };
static cc_int32 ccs_lock_invalidate_callback (ccs_callback_owner_t io_lock,
ccs_callback_t in_callback);
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_new (ccs_lock_t *out_lock,
cc_uint32 in_type,
cc_int32 in_invalid_object_err,
ccs_pipe_t in_client_pipe,
ccs_pipe_t in_reply_pipe,
ccs_lock_state_t in_lock_state_owner)
{
cc_int32 err = ccNoError;
ccs_lock_t lock = NULL;
if (!out_lock ) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_reply_pipe) ) { err = cci_check_error (ccErrBadParam); }
if (!in_lock_state_owner ) { err = cci_check_error (ccErrBadParam); }
if (in_type != cc_lock_read &&
in_type != cc_lock_write &&
in_type != cc_lock_upgrade &&
in_type != cc_lock_downgrade) {
err = cci_check_error (ccErrBadLockType);
}
if (!err) {
lock = malloc (sizeof (*lock));
if (lock) {
*lock = ccs_lock_initializer;
} else {
err = cci_check_error (ccErrNoMem);
}
}
if (!err) {
lock->type = in_type;
lock->lock_state_owner = in_lock_state_owner;
err = ccs_callback_new (&lock->callback,
in_invalid_object_err,
in_client_pipe,
in_reply_pipe,
(ccs_callback_owner_t) lock,
ccs_lock_invalidate_callback);
}
if (!err) {
*out_lock = lock;
lock = NULL;
}
ccs_lock_release (lock);
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_release (ccs_lock_t io_lock)
{
cc_int32 err = ccNoError;
if (!err && io_lock) {
ccs_callback_release (io_lock->callback);
free (io_lock);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
static cc_int32 ccs_lock_invalidate_callback (ccs_callback_owner_t io_lock,
ccs_callback_t in_callback)
{
cc_int32 err = ccNoError;
if (!io_lock ) { err = cci_check_error (ccErrBadParam); }
if (!in_callback) { err = cci_check_error (ccErrBadParam); }
if (!err) {
ccs_lock_t lock = (ccs_lock_t) io_lock;
err = ccs_lock_state_invalidate_lock (lock->lock_state_owner, lock);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_grant_lock (ccs_lock_t io_lock)
{
cc_int32 err = ccNoError;
if (!io_lock) { err = cci_check_error (ccErrBadParam); }
if (!err) {
err = ccs_callback_reply_to_client (io_lock->callback, NULL);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_uint32 ccs_lock_is_pending (ccs_lock_t in_lock,
cc_uint32 *out_pending)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!out_pending) { err = cci_check_error (ccErrBadParam); }
if (!err) {
err = ccs_callback_is_pending (in_lock->callback, out_pending);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_type (ccs_lock_t in_lock,
cc_uint32 *out_lock_type)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!out_lock_type) { err = cci_check_error (ccErrBadParam); }
if (!err) {
*out_lock_type = in_lock->type;
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_is_read_lock (ccs_lock_t in_lock,
cc_uint32 *out_is_read_lock)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!out_is_read_lock) { err = cci_check_error (ccErrBadParam); }
if (!err) {
*out_is_read_lock = (in_lock->type == cc_lock_read ||
in_lock->type == cc_lock_downgrade);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_is_write_lock (ccs_lock_t in_lock,
cc_uint32 *out_is_write_lock)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!out_is_write_lock) { err = cci_check_error (ccErrBadParam); }
if (!err) {
*out_is_write_lock = (in_lock->type == cc_lock_write ||
in_lock->type == cc_lock_upgrade);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_is_for_client_pipe (ccs_lock_t in_lock,
ccs_pipe_t in_client_pipe,
cc_uint32 *out_is_for_client_pipe)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!ccs_pipe_valid (in_client_pipe)) { err = cci_check_error (ccErrBadParam); }
if (!out_is_for_client_pipe ) { err = cci_check_error (ccErrBadParam); }
if (!err) {
err = ccs_callback_is_for_client_pipe (in_lock->callback, in_client_pipe,
out_is_for_client_pipe);
}
return cci_check_error (err);
}
/* ------------------------------------------------------------------------ */
cc_int32 ccs_lock_client_pipe (ccs_lock_t in_lock,
ccs_pipe_t *out_client_pipe)
{
cc_int32 err = ccNoError;
if (!in_lock ) { err = cci_check_error (ccErrBadParam); }
if (!out_client_pipe) { err = cci_check_error (ccErrBadParam); }
if (!err) {
err = ccs_callback_client_pipe (in_lock->callback, out_client_pipe);
}
return cci_check_error (err);
}
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