wasCSharpSQLite – Blame information for rev 7
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1 | office | 1 | /*
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2 | ** This program tests the ability of SQLite database to recover from a crash.
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3 | ** This program runs under Unix only, but the results are applicable to all
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4 | ** systems.
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5 | **
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6 | ** The main process first constructs a test database, then starts creating
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7 | ** subprocesses that write to that database. Each subprocess is killed off,
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8 | ** without a chance to clean up its database connection, after a random
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9 | ** delay. This killing of the subprocesses simulates a crash or power
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10 | ** failure. The next subprocess to open the database should rollback
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11 | ** whatever operation was in process at the time of the simulated crash.
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12 | **
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13 | ** If any problems are encountered, an error is reported and the test stops.
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14 | ** If no problems are seen after a large number of tests, we assume that
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15 | ** the rollback mechanism is working.
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16 | */ |
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17 | #include <stdio.h> |
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18 | #include <unistd.h> |
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19 | #include <sys/types.h> |
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20 | #include <sys/wait.h> |
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21 | #include <signal.h> |
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22 | #include <stdlib.h> |
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23 | #include <string.h> |
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24 | #include <sched.h> |
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25 | #include "sqlite.h" |
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26 | |||
27 | static void do_some_sql(int parent){ |
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28 | char *zErr; |
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29 | int rc = SQLITE_OK; |
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30 | sqlite *db; |
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31 | int cnt = 0; |
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32 | static char zBig[] = |
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33 | "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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34 | "-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
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35 | |||
36 | if( access("./test.db-journal",0)==0 ){ |
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37 | /*printf("pid %d: journal exists. rollback will be required\n",getpid());*/ unlink("test.db-saved"); |
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38 | system("cp test.db test.db-saved"); |
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39 | unlink("test.db-journal-saved"); |
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40 | system("cp test.db-journal test.db-journal-saved"); |
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41 | } |
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42 | db = sqlite_open("./test.db", 0, &zErr); |
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43 | if( db==0 ){ |
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44 | printf("ERROR: %s\n", zErr); |
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45 | if( strcmp(zErr,"database disk image is malformed")==0 ){ |
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46 | kill(parent, SIGKILL); |
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47 | } |
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48 | exit(1); |
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49 | } |
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50 | srand(getpid()); |
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51 | while( rc==SQLITE_OK ){ |
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52 | cnt++; |
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53 | rc = sqlite_exec_printf(db, |
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54 | "INSERT INTO t1 VALUES(%d,'%d%s')", 0, 0, &zErr, |
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55 | rand(), rand(), zBig); |
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56 | } |
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57 | if( rc!=SQLITE_OK ){ |
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58 | printf("ERROR #%d: %s\n", rc, zErr); |
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59 | if( rc==SQLITE_CORRUPT ){ |
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60 | kill(parent, SIGKILL); |
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61 | } |
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62 | } |
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63 | printf("pid %d: cnt=%d\n", getpid(), cnt); |
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64 | } |
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65 | |||
66 | |||
67 | int main(int argc, char **argv){ |
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68 | int i; |
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69 | sqlite *db; |
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70 | char *zErr; |
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71 | int status; |
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72 | int parent = getpid(); |
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73 | |||
74 | unlink("test.db"); |
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75 | unlink("test.db-journal"); |
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76 | db = sqlite_open("test.db", 0, &zErr); |
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77 | if( db==0 ){ |
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78 | printf("Cannot initialize: %s\n", zErr); |
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79 | return 1; |
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80 | } |
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81 | sqlite_exec(db, "CREATE TABLE t1(a,b)", 0, 0, 0); |
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82 | sqlite_close(db); |
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83 | for(i=0; i<10000; i++){ |
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84 | int pid = fork(); |
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85 | if( pid==0 ){ |
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86 | sched_yield(); |
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87 | do_some_sql(parent); |
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88 | return 0; |
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89 | } |
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90 | printf("test %d, pid=%d\n", i, pid); |
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91 | usleep(rand()%10000 + 1000); |
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92 | kill(pid, SIGKILL); |
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93 | waitpid(pid, &status, 0); |
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94 | } |
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95 | return 0; |
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96 | } |