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
45 #define CLOSE_CONNECTION 27
47 //Max number of objects
48 #define MAX_OBJECTS 20
49 //Max remote-machine connections
50 #define NUM_MACHINES 2
51 #define DEFAULT_OBJ_STORE_SIZE 1048510 //1MB
52 //Transaction id per machine
63 #include "threadnotify.h"
66 //bit designations for status field of objheader
74 #include "structdefs.h"
76 typedef struct objheader {
77 threadlist_t *notifylist;
78 unsigned short version;
79 unsigned short rcount;
83 (*((unsigned int *)&((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->___nextobject___))
86 (*((unsigned int *)&((struct ___Object___ *) x)->___nextobject___))
89 *((unsigned int *) &(((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->___localcopy___))
92 ((struct ___Object___ *)((unsigned int) x + sizeof(objheader_t)))->type
94 #define GETSIZE(size, x) {\
96 if (type<NUMCLASSES) {\
97 size=classsize[type];\
99 size=classsize[type]*((struct ArrayObject *)&((objheader_t *)x)[1])->___length___+sizeof(struct ArrayObject);\
105 typedef struct objheader {
106 threadlist_t *notifylist;
109 unsigned short version;
110 unsigned short rcount;
114 #define OID(x) x->oid
115 #define TYPE(x) x->type
116 #define STATUS(x) x->status
117 #define GETSIZE(size, x) size=classsize[TYPE(x)]
121 typedef struct objstr {
122 unsigned int size; //this many bytes are allocated after this header
127 typedef struct transrecord {
129 chashtable_t *lookupTable;
131 struct ___Object___ * revertlist;
135 // Structure is a shared structure that keeps track of responses from the participants
136 typedef struct thread_response {
140 // Structure that holds fixed data to be sent along with TRANS_REQUEST
141 typedef struct fixed_data {
142 char control; /* control message */
143 char trans_id[TID_LEN]; /* transaction id */
144 int mcount; /* participant count */
145 short numread; /* no of objects read */
146 short nummod; /* no of objects modified */
147 short numcreated; /* no of objects created */
148 int sum_bytes; /* total bytes of modified objects in a transaction */
151 /* Structure that holds trans request information for each participant */
152 typedef struct trans_req_data {
153 fixed_data_t f; /* Holds first few fixed bytes of data sent during TRANS_REQUEST protcol*/
154 unsigned int *listmid; /* Pointer to array holding list of participants */
155 char *objread; /* Pointer to array holding oid and version number of objects that are only read */
156 unsigned int *oidmod; /* Pointer to array holding oids of objects that are modified */
157 unsigned int *oidcreated; /* Pointer to array holding oids of objects that are newly created */
160 /* Structure that holds information of objects that are not found in the participant
161 * and objs locked within a transaction during commit process */
162 typedef struct trans_commit_data{
163 unsigned int *objlocked; /* Pointer to array holding oids of objects locked inside a transaction */
164 unsigned int *objnotfound; /* Pointer to array holding oids of objects not found on the participant machine */
165 void *modptr; /* Pointer to the address in the mainobject store of the participant that holds all modified objects */
166 int numlocked; /* no of objects locked */
167 int numnotfound; /* no of objects not found */
168 } trans_commit_data_t;
171 #define PRINT_TID(PTR) printf("DEBUG -> %x %d\n", PTR->mid, PTR->thread_id);
172 /* Structure for passing multiple arguments to a thread
173 * spawned to process each transaction on a machine */
174 typedef struct thread_data_array {
177 trans_req_data_t *buffer; /* Holds trans request information sent to participants */
178 thread_response_t *recvmsg; /* Shared datastructure to keep track of the participants response to a trans request */
179 pthread_cond_t *threshold; /* Condition var to waking up a thread */
180 pthread_mutex_t *lock; /* Lock for counting participants response */
181 int *count; /* Variable to count responses from all participants to the TRANS_REQUEST protocol */
182 char *replyctrl; /* Shared ctrl message that stores the reply to be sent to participants, filled by decideResponse() */
183 char *replyretry; /* Shared variable that keep track if coordinator needs retry */
184 transrecord_t *rec; /* To send modified objects */
185 } thread_data_array_t;
188 //Structure for passing arguments to the local m/c thread
189 typedef struct local_thread_data_array {
190 thread_data_array_t *tdata; /* Holds all the arguments send to a thread that is spawned when transaction commits */
191 trans_commit_data_t *transinfo; /* Holds information of objects locked and not found in the participant */
192 } local_thread_data_array_t;
194 //Structure to store mid and socketid information
195 typedef struct midSocketInfo {
196 unsigned int mid; /* To communicate with mid use sockid in this data structure*/
200 /* Initialize main object store and lookup tables, start server thread. */
202 void send_data(int fd, void *buf, int buflen);
203 void recv_data(int fd, void *buf, int buflen);
204 int recv_data_errorcode(int fd, void *buf, int buflen);
206 /* Prototypes for object header */
207 unsigned int getNewOID(void);
208 /* end object header */
210 /* Prototypes for object store */
211 objstr_t *objstrCreate(unsigned int size); //size in bytes
212 void objstrDelete(objstr_t *store); //traverse and free entire list
213 void *objstrAlloc(objstr_t *store, unsigned int size); //size in bytes
214 /* end object store */
216 /* Prototypes for server portion */
218 void *dstmAccept(void *);
219 int readClientReq(trans_commit_data_t *, int);
220 int processClientReq(fixed_data_t *, trans_commit_data_t *,unsigned int *, char *, void *, unsigned int *, int);
221 char handleTransReq(fixed_data_t *, trans_commit_data_t *, unsigned int *, char *, void *, int);
222 char decideCtrlMessage(fixed_data_t *, trans_commit_data_t *, int *, int *, int *, int *, int *, void *, unsigned int *, unsigned int *, int);
223 int transCommitProcess(void *, unsigned int *, unsigned int *, int, int, int);
224 void processReqNotify(unsigned int numoid, unsigned int *oid, unsigned short *version, unsigned int mid, unsigned int threadid);
225 /* end server portion */
227 /* Prototypes for transactions */
228 /* Function called at beginning. Passes in the first parameter. */
229 /* Returns 1 if this thread should run the main process */
231 int dstmStartup(const char *);
233 int processConfigFile();
234 void addHost(unsigned int);
235 void mapObjMethod(unsigned short);
238 transrecord_t *transStart();
239 objheader_t *transRead(transrecord_t *, unsigned int);
240 objheader_t *transCreateObj(transrecord_t *, unsigned int); //returns oid header
241 int transCommit(transrecord_t *record); //return 0 if successful
242 void *transRequest(void *); //the C routine that the thread will execute when TRANS_REQUEST begins
243 void decideResponse(thread_data_array_t *);// Coordinator decides what response to send to the participant
244 char sendResponse(thread_data_array_t *, int); //Sends control message back to Participants
245 void *getRemoteObj(transrecord_t *, unsigned int, unsigned int);// returns object header from main object store after object is copied into it from remote machine
246 void *handleLocalReq(void *);//handles Local requests
247 int transComProcess(local_thread_data_array_t *);
248 int transAbortProcess(local_thread_data_array_t *);
249 void transAbort(transrecord_t *trans);
251 void prefetch(int, unsigned int *, unsigned short *, short*);
252 void *transPrefetch(void *);
253 void *mcqProcess(void *);
254 void checkPrefetchTuples(prefetchqelem_t *);
255 prefetchpile_t *foundLocal(prefetchqelem_t *);// returns node with prefetch elements(oids, offsets)
256 prefetchpile_t *makePreGroups(prefetchqelem_t *, int *);// returns node with prefetch elements(oids, offsets)
257 void checkPreCache(prefetchqelem_t *, int *, unsigned int, int);
258 int transPrefetchProcess(transrecord_t *, int **, short);
259 void sendPrefetchReq(prefetchpile_t*, int);
260 int getPrefetchResponse(int);
261 unsigned short getObjType(unsigned int oid);
262 int startRemoteThread(unsigned int oid, unsigned int mid);
263 /* Sends notification request for thread join, if sucessful returns 0 else returns -1 */
264 int reqNotify(unsigned int *oidarry, unsigned short *versionarry, unsigned int numoid);
265 void threadNotify(unsigned int oid, unsigned short version, unsigned int tid);
266 int notifyAll(threadlist_t **head, unsigned int oid, unsigned int version);
268 /* end transactions */