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MySQL 5.1: mysql/src/5.1-dbg/storage/innobase/usr/usr0sess.c Source File
mysql/src/5.1-dbg/storage/innobase/usr/usr0sess.c

00001 /******************************************************
00002 Sessions
00003 
00004 (c) 1996 Innobase Oy
00005 
00006 Created 6/25/1996 Heikki Tuuri
00007 *******************************************************/
00008 
00009 #include "usr0sess.h"
00010 
00011 #ifdef UNIV_NONINL
00012 #include "usr0sess.ic"
00013 #endif
00014 
00015 #include "trx0trx.h"
00016 
00017 /*************************************************************************
00018 Closes a session, freeing the memory occupied by it. */
00019 static
00020 void
00021 sess_close(
00022 /*=======*/
00023         sess_t*         sess);  /* in, own: session object */
00024 
00025 /*************************************************************************
00026 Opens a session. */
00027 
00028 sess_t*
00029 sess_open(void)
00030 /*===========*/
00031                                         /* out, own: session object */
00032 {
00033         sess_t* sess;
00034 
00035 #ifdef UNIV_SYNC_DEBUG
00036         ut_ad(mutex_own(&kernel_mutex));
00037 #endif /* UNIV_SYNC_DEBUG */
00038         sess = mem_alloc(sizeof(sess_t));
00039 
00040         sess->state = SESS_ACTIVE;
00041 
00042         sess->trx = trx_create(sess);
00043 
00044         UT_LIST_INIT(sess->graphs);
00045 
00046         return(sess);
00047 }
00048 
00049 /*************************************************************************
00050 Closes a session, freeing the memory occupied by it. */
00051 static
00052 void
00053 sess_close(
00054 /*=======*/
00055         sess_t* sess)   /* in, own: session object */
00056 {
00057 #ifdef UNIV_SYNC_DEBUG
00058         ut_ad(mutex_own(&kernel_mutex));
00059 #endif /* UNIV_SYNC_DEBUG */
00060         ut_ad(sess->trx == NULL);
00061 
00062         mem_free(sess);
00063 }
00064 
00065 /*************************************************************************
00066 Closes a session, freeing the memory occupied by it, if it is in a state
00067 where it should be closed. */
00068 
00069 ibool
00070 sess_try_close(
00071 /*===========*/
00072                         /* out: TRUE if closed */
00073         sess_t* sess)   /* in, own: session object */
00074 {
00075 #ifdef UNIV_SYNC_DEBUG
00076         ut_ad(mutex_own(&kernel_mutex));
00077 #endif /* UNIV_SYNC_DEBUG */
00078         if (UT_LIST_GET_LEN(sess->graphs) == 0) {
00079                 sess_close(sess);
00080 
00081                 return(TRUE);
00082         }
00083 
00084         return(FALSE);
00085 }
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