8 /***********************************************************
10 **********************************************************/
11 #define GET_NTUPLES(x) ((int *)(x + sizeof(prefetchqelem_t)))
12 #define GET_PTR_OID(x) ((unsigned int *)(x + sizeof(prefetchqelem_t) + sizeof(int)))
13 #define GET_PTR_EOFF(x,n) ((short *)(x + sizeof(prefetchqelem_t) + sizeof(int) + (n*sizeof(unsigned int))))
14 #define GET_PTR_ARRYFLD(x,n) ((short *)(x + sizeof(prefetchqelem_t) + sizeof(int) + (n*sizeof(unsigned int)) + (n*sizeof(short))))
15 /*****************************************
16 * Coordinator Messages
17 ***************************************/
18 #define READ_REQUEST 1
19 #define READ_MULT_REQUEST 2
20 #define MOVE_REQUEST 3
21 #define MOVE_MULT_REQUEST 4
22 #define TRANS_REQUEST 5
24 #define TRANS_COMMIT 7
25 #define TRANS_PREFETCH 8
26 #define TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING 9
28 /*********************************
29 * Participant Messages
30 *******************************/
31 #define OBJECT_FOUND 10
32 #define OBJECT_NOT_FOUND 11
33 #define OBJECTS_FOUND 12
34 #define OBJECTS_NOT_FOUND 13
35 #define TRANS_AGREE 17
36 #define TRANS_DISAGREE 18
37 #define TRANS_AGREE_BUT_MISSING_OBJECTS 19
38 #define TRANS_SOFT_ABORT 20
39 #define TRANS_SUCESSFUL 21
40 #define TRANS_PREFETCH_RESPONSE 22
41 #define START_REMOTE_THREAD 23
42 #define THREAD_NOTIFY_REQUEST 24
43 #define THREAD_NOTIFY_RESPONSE 25
44 #define TRANS_UNSUCESSFUL 26
46 //Max number of objects
47 #define MAX_OBJECTS 20
48 //Max remote-machine connections
49 #define NUM_MACHINES 2
50 #define DEFAULT_OBJ_STORE_SIZE 1048510 //1MB
51 //Transaction id per machine
62 #include "threadnotify.h"
65 //bit designations for status field of objheader
73 #include "structdefs.h"
75 typedef struct objheader {
76 threadlist_t *notifylist;
77 unsigned short version;
78 unsigned short rcount;
82 (*((unsigned int *)&((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->___nextobject___))
85 (*((unsigned int *)&((struct ___Object___ *) x)->___nextobject___))
88 *((unsigned int *) &(((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->___localcopy___))
91 ((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->type
93 #define GETSIZE(size, x) {\
95 if (type<NUMCLASSES) {\
96 size=classsize[type];\
98 size=classsize[type]*((struct ArrayObject *)&((objheader_t *)x)[1])->___length___+sizeof(struct ArrayObject);\
104 typedef struct objheader {
105 threadlist_t *notifylist;
108 unsigned short version;
109 unsigned short rcount;
113 #define OID(x) x->oid
114 #define TYPE(x) x->type
115 #define STATUS(x) x->status
116 #define GETSIZE(size, x) size=classsize[TYPE(x)]
120 typedef struct objstr {
121 unsigned int size; //this many bytes are allocated after this header
126 typedef struct transrecord {
128 chashtable_t *lookupTable;
130 struct ___Object___ * revertlist;
134 // Structure is a shared structure that keeps track of responses from the participants
135 typedef struct thread_response {
139 // Structure that holds fixed data to be sent along with TRANS_REQUEST
140 typedef struct fixed_data {
141 char control; /* control message */
142 char trans_id[TID_LEN]; /* transaction id */
143 int mcount; /* participant count */
144 short numread; /* no of objects read */
145 short nummod; /* no of objects modified */
146 short numcreated; /* no of objects created */
147 int sum_bytes; /* total bytes of modified objects in a transaction */
150 /* Structure that holds trans request information for each participant */
151 typedef struct trans_req_data {
152 fixed_data_t f; /* Holds first few fixed bytes of data sent during TRANS_REQUEST protcol*/
153 unsigned int *listmid; /* Pointer to array holding list of participants */
154 char *objread; /* Pointer to array holding oid and version number of objects that are only read */
155 unsigned int *oidmod; /* Pointer to array holding oids of objects that are modified */
156 unsigned int *oidcreated; /* Pointer to array holding oids of objects that are newly created */
159 /* Structure that holds information of objects that are not found in the participant
160 * and objs locked within a transaction during commit process */
161 typedef struct trans_commit_data{
162 unsigned int *objlocked; /* Pointer to array holding oids of objects locked inside a transaction */
163 unsigned int *objnotfound; /* Pointer to array holding oids of objects not found on the participant machine */
164 void *modptr; /* Pointer to the address in the mainobject store of the participant that holds all modified objects */
165 int numlocked; /* no of objects locked */
166 int numnotfound; /* no of objects not found */
167 } trans_commit_data_t;
170 #define PRINT_TID(PTR) printf("DEBUG -> %x %d\n", PTR->mid, PTR->thread_id);
171 /* Structure for passing multiple arguments to a thread
172 * spawned to process each transaction on a machine */
173 typedef struct thread_data_array {
176 trans_req_data_t *buffer; /* Holds trans request information sent to participants */
177 thread_response_t *recvmsg; /* Shared datastructure to keep track of the participants response to a trans request */
178 pthread_cond_t *threshold; /* Condition var to waking up a thread */
179 pthread_mutex_t *lock; /* Lock for counting participants response */
180 int *count; /* Variable to count responses from all participants to the TRANS_REQUEST protocol */
181 char *replyctrl; /* Shared ctrl message that stores the reply to be sent to participants, filled by decideResponse() */
182 char *replyretry; /* Shared variable that keep track if coordinator needs retry */
183 transrecord_t *rec; /* To send modified objects */
184 } thread_data_array_t;
187 //Structure for passing arguments to the local m/c thread
188 typedef struct local_thread_data_array {
189 thread_data_array_t *tdata; /* Holds all the arguments send to a thread that is spawned when transaction commits */
190 trans_commit_data_t *transinfo; /* Holds information of objects locked and not found in the participant */
191 } local_thread_data_array_t;
193 //Structure to store mid and socketid information
194 typedef struct midSocketInfo {
195 unsigned int mid; /* To communicate with mid use sockid in this data structure*/
199 /* Initialize main object store and lookup tables, start server thread. */
201 void send_data(int fd, void *buf, int buflen);
202 void recv_data(int fd, void *buf, int buflen);
204 /* Prototypes for object header */
205 unsigned int getNewOID(void);
206 /* end object header */
208 /* Prototypes for object store */
209 objstr_t *objstrCreate(unsigned int size); //size in bytes
210 void objstrDelete(objstr_t *store); //traverse and free entire list
211 void *objstrAlloc(objstr_t *store, unsigned int size); //size in bytes
212 /* end object store */
214 /* Prototypes for server portion */
216 void *dstmAccept(void *);
217 int readClientReq(trans_commit_data_t *, int);
218 int processClientReq(fixed_data_t *, trans_commit_data_t *,unsigned int *, char *, void *, unsigned int *, int);
219 char handleTransReq(fixed_data_t *, trans_commit_data_t *, unsigned int *, char *, void *, int);
220 char decideCtrlMessage(fixed_data_t *, trans_commit_data_t *, int *, int *, int *, int *, int *, void *, unsigned int *, unsigned int *, int);
221 int transCommitProcess(void *, unsigned int *, unsigned int *, int, int, int);
222 void processReqNotify(unsigned int numoid, unsigned int *oid, unsigned short *version, unsigned int mid, unsigned int threadid);
223 /* end server portion */
225 /* Prototypes for transactions */
226 /* Function called at beginning. Passes in the first parameter. */
227 /* Returns 1 if this thread should run the main process */
229 int dstmStartup(const char *);
231 int processConfigFile();
232 void addHost(unsigned int);
233 void mapObjMethod(unsigned short);
236 transrecord_t *transStart();
237 objheader_t *transRead(transrecord_t *, unsigned int);
238 objheader_t *transCreateObj(transrecord_t *, unsigned int); //returns oid header
239 int transCommit(transrecord_t *record); //return 0 if successful
240 void *transRequest(void *); //the C routine that the thread will execute when TRANS_REQUEST begins
241 void decideResponse(thread_data_array_t *);// Coordinator decides what response to send to the participant
242 char sendResponse(thread_data_array_t *, int); //Sends control message back to Participants
243 void *getRemoteObj(transrecord_t *, unsigned int, unsigned int);// returns object header from main object store after object is copied into it from remote machine
244 void *handleLocalReq(void *);//handles Local requests
245 int transComProcess(local_thread_data_array_t *);
246 int transAbortProcess(local_thread_data_array_t *);
247 void transAbort(transrecord_t *trans);
249 void prefetch(int, unsigned int *, unsigned short *, short*);
250 void *transPrefetch(void *);
251 void *mcqProcess(void *);
252 void checkPrefetchTuples(prefetchqelem_t *);
253 prefetchpile_t *foundLocal(prefetchqelem_t *);// returns node with prefetch elements(oids, offsets)
254 prefetchpile_t *makePreGroups(prefetchqelem_t *, int *);// returns node with prefetch elements(oids, offsets)
255 void checkPreCache(prefetchqelem_t *, int *, unsigned int, int);
256 int transPrefetchProcess(transrecord_t *, int **, short);
257 void sendPrefetchReq(prefetchpile_t*, int);
258 int getPrefetchResponse(int);
259 unsigned short getObjType(unsigned int oid);
260 int startRemoteThread(unsigned int oid, unsigned int mid);
261 /* Sends notification request for thread join, if sucessful returns 0 else returns -1 */
262 int reqNotify(unsigned int *oidarry, unsigned short *versionarry, unsigned int numoid);
263 void threadNotify(unsigned int oid, unsigned short version, unsigned int tid);
264 int notifyAll(threadlist_t **head, unsigned int oid, unsigned int version);
266 /* end transactions */