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Changes In Branch better-comment Excluding Merge-Ins
This is equivalent to a diff from 3daab94977 to 6f2fb60e49
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2021-05-19
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| 19:28 | Add a comment with useful information about SHM locking. No changes to deliverable code. (check-in: 4e81ea3b15 user: drh tags: trunk) | |
| 19:27 | Fix a formatting error on the comment. (Closed-Leaf check-in: 6f2fb60e49 user: drh tags: better-comment) | |
| 16:55 | Add a table of shared-memory lock offsets in a comment in the os_unix.c code. Include some assert()s to help verify the numbers. (check-in: b480aacb34 user: drh tags: better-comment) | |
| 14:49 | Allow aggregate sub-selects within ORDER BY and PARTITION BY clauses of window frame definitions. (check-in: 3daab94977 user: dan tags: trunk) | |
| 12:17 | Improved column name and column type determination for the RETURNING clause. (check-in: 699c33990a user: drh tags: trunk) | |
Changes to src/os_unix.c.
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assert( ArraySize(aSyscall)==29 );
/* Register all VFSes defined in the aVfs[] array */
for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
sqlite3_vfs_register(&aVfs[i], i==0);
}
unixBigLock = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
return SQLITE_OK;
}
/*
** Shutdown the operating system interface.
**
** Some operating systems might need to do some cleanup in this routine,
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assert( ArraySize(aSyscall)==29 );
/* Register all VFSes defined in the aVfs[] array */
for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
sqlite3_vfs_register(&aVfs[i], i==0);
}
unixBigLock = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_VFS1);
/* Validate lock assumptions */
assert( SQLITE_SHM_NLOCK==8 ); /* Number of available locks */
assert( UNIX_SHM_BASE==120 ); /* Start of locking area */
/* Locks:
** WRITE UNIX_SHM_BASE 120
** CKPT UNIX_SHM_BASE+1 121
** RECOVER UNIX_SHM_BASE+2 122
** READ-0 UNIX_SHM_BASE+3 123
** READ-1 UNIX_SHM_BASE+4 124
** READ-2 UNIX_SHM_BASE+5 125
** READ-3 UNIX_SHM_BASE+6 126
** READ-4 UNIX_SHM_BASE+7 127
** DMS UNIX_SHM_BASE+8 128
*/
assert( UNIX_SHM_DMS==128 ); /* Byte offset of the deadman-switch */
return SQLITE_OK;
}
/*
** Shutdown the operating system interface.
**
** Some operating systems might need to do some cleanup in this routine,
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