|
1
by brian
clean slate |
1 |
/******************************************************
|
2 |
Sessions
|
|
3 |
||
4 |
(c) 1996 Innobase Oy
|
|
5 |
||
6 |
Created 6/25/1996 Heikki Tuuri
|
|
7 |
*******************************************************/
|
|
8 |
||
9 |
#include "usr0sess.h" |
|
10 |
||
11 |
#ifdef UNIV_NONINL
|
|
12 |
#include "usr0sess.ic" |
|
13 |
#endif
|
|
14 |
||
15 |
#include "trx0trx.h" |
|
16 |
||
17 |
/*************************************************************************
|
|
18 |
Closes a session, freeing the memory occupied by it. */
|
|
19 |
static
|
|
20 |
void
|
|
21 |
sess_close( |
|
22 |
/*=======*/
|
|
23 |
sess_t* sess); /* in, own: session object */ |
|
24 |
||
25 |
/*************************************************************************
|
|
26 |
Opens a session. */
|
|
27 |
||
28 |
sess_t* |
|
29 |
sess_open(void) |
|
30 |
/*===========*/
|
|
31 |
/* out, own: session object */
|
|
32 |
{
|
|
33 |
sess_t* sess; |
|
34 |
||
35 |
ut_ad(mutex_own(&kernel_mutex)); |
|
36 |
||
37 |
sess = mem_alloc(sizeof(sess_t)); |
|
38 |
||
39 |
sess->state = SESS_ACTIVE; |
|
40 |
||
41 |
sess->trx = trx_create(sess); |
|
42 |
||
43 |
UT_LIST_INIT(sess->graphs); |
|
44 |
||
45 |
return(sess); |
|
46 |
}
|
|
47 |
||
48 |
/*************************************************************************
|
|
49 |
Closes a session, freeing the memory occupied by it. */
|
|
50 |
static
|
|
51 |
void
|
|
52 |
sess_close( |
|
53 |
/*=======*/
|
|
54 |
sess_t* sess) /* in, own: session object */ |
|
55 |
{
|
|
56 |
ut_ad(mutex_own(&kernel_mutex)); |
|
57 |
ut_ad(sess->trx == NULL); |
|
58 |
||
59 |
mem_free(sess); |
|
60 |
}
|
|
61 |
||
62 |
/*************************************************************************
|
|
63 |
Closes a session, freeing the memory occupied by it, if it is in a state
|
|
64 |
where it should be closed. */
|
|
65 |
||
66 |
ibool
|
|
67 |
sess_try_close( |
|
68 |
/*===========*/
|
|
69 |
/* out: TRUE if closed */
|
|
70 |
sess_t* sess) /* in, own: session object */ |
|
71 |
{
|
|
72 |
ut_ad(mutex_own(&kernel_mutex)); |
|
73 |
||
74 |
if (UT_LIST_GET_LEN(sess->graphs) == 0) { |
|
75 |
sess_close(sess); |
|
76 |
||
77 |
return(TRUE); |
|
78 |
}
|
|
79 |
||
80 |
return(FALSE); |
|
81 |
}
|