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328 Commits

Author SHA1 Message Date
drh
c99597ca10 WAL runs but quickly deadlocks. 
FossilOrigin-Name: ace58acbf1fad13d2be96cafebc3a22875098d03
 2010-05-31 01:41:15 +00:00
drh
73b64e4d2e Initial code for incremental checkpoint in WAL mode. This check-in compiles 
on unix and runs as long as you do not engage WAL mode.  WAL mode crashes and
burns.  Consider this check-in a baseline implementation for getting the new
capability up and running.

FossilOrigin-Name: ef3ba7a17ff90674d702e5694b9e792851ab6998
 2010-05-30 19:55:15 +00:00
drh
026ac28b28 Change the semantics of xShmGet() such that it will never increase the size 
of shared memory.  xShmSize() must be used to grow the size of shared memory.
A shared memory segment size cannot be shrunk (except by dropping it).

FossilOrigin-Name: 72de00731245277b2209103ec0a76e3d4f56530e
 2010-05-26 15:06:38 +00:00
drh
1b78eaf0ba Update header comments in wal.c to correctly describe the WAL file format. 
Update the locking region offsets in os_unix.c and os_win.c and add assert()
statement to verify that the locking region offsets are correct.

FossilOrigin-Name: 40030c0739f821ea8ee188c28c579507f10448bc
 2010-05-25 13:40:03 +00:00
drh
c527669df5 Comment out the SQLITE_FCNTL_SIZE_HINT from os_unix.c since it does not 
seem to provide any performance gain there.

FossilOrigin-Name: 7d01309da658d6b658c1b2e53bbdc5112fb0a4d9
 2010-05-21 18:24:06 +00:00
drh
286a288493 Add a new xShmBarrier method to the VFS - a shared-memory fence operation. 
Implement the same in both unix and win32.  Use it to make the WAL subsystem
more robust.

FossilOrigin-Name: 1bd011c9fed5ef29fb616b4d0a52df3b82221b1f
 2010-05-20 23:51:06 +00:00
drh
9ff27ecdb2 Add the SQLITE_FCNTL_SIZE_HINT operator to sqlite3_file_control() and use it 
to give the VFS hints about the ultimate size of a database file when the
file is growing.

FossilOrigin-Name: 2b7e3b4a30d6a7c4a8a4b8e7dd2ed728b565c96d
 2010-05-19 19:26:05 +00:00
drh
5939f44375 Mark the shared-memory in the WAL implementation as volatile. 
FossilOrigin-Name: 0a6787908e989bd5e6af25acbdc59ebc8fa61d6d
 2010-05-18 13:27:12 +00:00
drh
ff59a114bd Fix a typo that (by bad luck) was not a syntax error but which caused some 
important lines of code to be skipped when SQLITE_DEBUG was not used.

FossilOrigin-Name: 9ef99d97d25aae81df971d40ad10c544b8f30053
 2010-05-14 20:15:51 +00:00
drh
d91c68f6cc Simplifications to the SHM implementation in os_unix.c, taking advantage 
of the removal of the LinuxThreads mess.

FossilOrigin-Name: d1debe5def82a6bc72f11b8787176ac60259630f
 2010-05-14 14:52:25 +00:00
drh
8af6c228f8 Simplify os_unix.c by removing support for LinuxThreads. Linux systems must 
either use NPTL or else not share database connections across threads.

FossilOrigin-Name: e294b696ba91512b1ca5547774c51ea07b4cb5bc
 2010-05-14 12:43:01 +00:00
drh
308c2a5c0f Change the OSTRACEn() macro to OSTRACE(()). Also rename some internal fields 
and variables in os_unix.c to be more meaningful and searchable.

FossilOrigin-Name: 5fe529f239cddbf4b7ea57abb02d95cc0d94f5f5
 2010-05-14 11:30:18 +00:00
drh
a925fd256b Change the xShmSize() implementation in os_unix.c so that it will only 
increase and never decrease the size of a shared-memory segment.

FossilOrigin-Name: 149d2ae4a6fe2f86822f286d2a7092c51bec7ebb
 2010-05-13 08:33:35 +00:00
drh
d9e5c4f6ed Refactoring the VFS-SHM methods used by WAL. This version compiles and 
runs non-WAL test cases but crashes and burns on wal.test.

FossilOrigin-Name: 2b00152c1ac0b3735aa6cfab61259ff04d81c701
 2010-05-12 18:01:39 +00:00
dan
97c1f6c8f2 Have os_unix.c use the suffix "-wal-index" for wal-index files instead of "-wal-inde". 
FossilOrigin-Name: 885e854e7cdc79ecc9d5772d563ddc0f61753ab6
 2010-05-11 16:29:54 +00:00
drh
09b1330026 Fix an off-by-one error while constructing the name of the mmap file for 
the wal-index under os_unix.c.

FossilOrigin-Name: 6e3735f72cb7d2f4d16c8f9bc59ff159c75243e5
 2010-05-10 19:51:32 +00:00
drh
1c5bb4d69c Fix an uninitialized variable in OSX proxy locking. 
FossilOrigin-Name: 96d6eaf4d2be453191b36875811d9556ad0763ed
 2010-05-10 17:29:28 +00:00
drh
e874d9ed79 Change the xShmOpen() method of the VFS to take the database file name as 
its argument, not the WAL file name.  Also fix some unrelated compiler
warnings.

FossilOrigin-Name: a65c2939267ef6acec4e355a207f98f217e263d6
 2010-05-07 20:02:23 +00:00
dan
65be0d8cce Instead of transitioning to RECOVER state from CHECKPOINT when a recovery is required, perform the recovery while holding the CHECKPOINT lock. 
FossilOrigin-Name: bb0b6021e721c2e4f1533ab18381604c6b7b31d5
 2010-05-06 18:48:27 +00:00
drh
ccd13d1f80 Further simplifications to the SHM locking logic. Remove the SQLITE_SHM_QUERY 
option.  Unify the WRITE to READ and RECOVER to READ transitions.

FossilOrigin-Name: e9bfa6e4ce7d1edc6be8b9173ac3b6bfd180632a
 2010-05-05 19:09:49 +00:00
drh
4bc79def36 Simplifications to the SHM locking implementation in os_unix.c. 
FossilOrigin-Name: 9de05bfb09e29bafdf5782263330fe8eefcfaba3
 2010-05-05 18:20:07 +00:00
drh
0dcb0a7d7b Fix a bug in the xCurrentTime() method of the os_unix.c VFS. 
FossilOrigin-Name: 551df11a5613e3edc6c5de44f0ac6abc2d0e6cdf
 2010-05-03 18:22:52 +00:00
dan
76ed3bc044 Fix a couple of errors in WAL code that can occur in an OOM situation. 
FossilOrigin-Name: 9d3f3736be42ef8ab48b099d4712e08dfca97873
 2010-05-03 17:18:24 +00:00
drh
1fbe0f2a8f Change the VFS definition so that all methods take a VFS object pointer as 
their first parameter.

FossilOrigin-Name: 43b5b07f0d996d7ef7426346b1792e9ca898f487
 2010-05-03 16:30:27 +00:00
drh
b7e8ea2015 Use VFS method xCurrentTimeInt64 instead of xCurrentTime when it is available. 
Provide an implementation of xCurrentTimeInt64 for os_unix.c.

FossilOrigin-Name: ab77b3ae6da3370d8bc3b2c9c0edc723b69f5a95
 2010-05-03 14:32:30 +00:00
drh
2d536e187f Change the SHM interface so that it does not take the name of the shared 
object but rather the name of the WAL file and derives its own name from
that.  Remove the xShmDelete method from the VFS and replace it with a
delete flag on xShmClose.

FossilOrigin-Name: 94dea5f9c11a68564220cec76ac3fae2ba90e907
 2010-05-01 20:17:30 +00:00
drh
f72a8751c9 Remove the xShmPush and xShmPull methods from the VFS. 
FossilOrigin-Name: 69e07fdbde5054593de948b76dfac157cf5d4058
 2010-05-01 18:23:08 +00:00
drh
bee6f4ebe2 Define an invariant to guarantee deadlock-free operation of SHM in os_unix.c 
and check that invariant with assert() statements.

FossilOrigin-Name: 6af2dca75b8139134ea394c1d71aefc6523f02e9
 2010-05-01 17:57:36 +00:00
drh
77b95a379c Rework mutexes on the SHM implemention for os_unix to avoid a deadlock during 
WAL recovery.

FossilOrigin-Name: 1a0f69bef2c489e81a3d4b910b426972e9ed4054
 2010-05-01 17:50:37 +00:00
dan
5cf53537a8 Support compile-time option SQLITE_OMIT_WAL, for building without WAL support. 
FossilOrigin-Name: 9b230c43dfa112e3e1589f9775926807bd36b36e
 2010-05-01 16:40:20 +00:00
drh
6dea3248ae Change the SHM VFS logic in os_unix.c so that it does not hold an exclusive 
lock n the mapped memory when also holding a CHECKPOINT lock.  This
improves concurrency between readers and checkpointers.

FossilOrigin-Name: 8660cda6f8ef43bd276897ef3b5fc2376b5684dc
 2010-04-30 17:47:51 +00:00
drh
400df2ea70 In the debugging output for SHM-LOCK in os_unix.c, use symbolic names 
for the lock states rather than raw numbers.

FossilOrigin-Name: 2afc33de2b2012d034fb0d2057a5a45e304516ca
 2010-04-30 16:48:19 +00:00
dan
43a56b812c Fix a problem in the previous commit. Both unixShm.lockState and unixShm.readLock should be set to READ when downgrading from a WRITE to a READ lock 
FossilOrigin-Name: 90119fecbce06c8db82194dfd9d5045be29b1cda
 2010-04-30 16:41:53 +00:00
dan
78daa5a7d9 Fix a bug whereby upgrading from a READ_FULL to a WRITE lock, and then back to a read lock was dropping all WAL locks. 
FossilOrigin-Name: 55f5af5e174df7a28deeb36faa51138926669897
 2010-04-30 16:38:59 +00:00
drh
d749084ad0 Fix a couple uninitialized variables in the xShmLock method of the unix VFS. 
Improved debugging logic for xShmLock.

FossilOrigin-Name: 69567c5fca9e30b7660e6f56350be929c3890d7e
 2010-04-30 15:54:46 +00:00
drh
5530b764a8 Separate the concepts of underlying storage size and mapped size in the 
VFS shared-memory implementation.

FossilOrigin-Name: 4cbe49f13fed288f94ff305bcfd99df907bf7baf
 2010-04-30 14:39:50 +00:00
dan
87bfb51ef8 Add a missing walIndexUnmap() call to the checkpoint code. Change a couple of SQLITE_CANTOPEN constants to SQLITE_CANTOPEN_BKPT. 
FossilOrigin-Name: 1f9e8c5c27ae2c68bc01d8e2bb2c662be7b3f161
 2010-04-30 11:43:28 +00:00
dan
e93808dde2 Add missing mutexes to unixShmClose(). 
FossilOrigin-Name: a4741cb54dd5e753d48fd05ac9dbe27ee4aa1ec0
 2010-04-30 10:06:09 +00:00
dan
4c97b53425 Fix a couple of assert() statements in os_unix.c and wal.c. Combine sqlite3WalIsDirty() with sqlite3WalUndo(). 
FossilOrigin-Name: a8f958be804ee05c4137b3cd110db344713af5f2
 2010-04-30 09:52:17 +00:00
dan
ba51590bcd Add a missing walIndexUnmap() to sqlite3WalSnapshotOpen(). 
FossilOrigin-Name: 72b95fde15dae56390dc8d4168fb2757447e289e
 2010-04-30 09:32:06 +00:00
drh
79e6c78ccc The first 6 WAL tests now work. It's a start. 
FossilOrigin-Name: a92c1851da10acf51e7f6f086b8a23bd731940b3
 2010-04-30 02:13:26 +00:00
drh
7ed91f2344 Refactor wal.c to use the VFS. This check-in compiles and links and works 
ok as long as you leave WAL turned off, but WAL does not work.

FossilOrigin-Name: 62db5fa3b61be885b2d94e9b9ce3877b2c588350
 2010-04-29 22:34:07 +00:00
drh
31cbbbad1c Untested implementation of the shared-memory dead-man-switch. 
FossilOrigin-Name: 706611283ea2575c2942543391026b36061cfc1c
 2010-04-29 16:40:51 +00:00
drh
7b6944047e Progress towards a VFS that will support WAL. Locking code is in place 
but is untested.  Still no support for the DMS.

FossilOrigin-Name: 1bde41cf081570ad257f927b641e752dff4ed014
 2010-04-29 15:17:48 +00:00
drh
9beb1584bd Changes to the interface design for the xShmLock method of the VFS. 
FossilOrigin-Name: 348409de26eafe12f5cb1236e8e167a4183d4051
 2010-04-28 17:21:33 +00:00
drh
af75c8695b Add the xShmRelease() method to the VFS. The os_unix.c implementation of 
the shared memory logic is still non-functional.

FossilOrigin-Name: ed715b47c5f7657fbf901805981867898054b14d
 2010-04-27 11:49:27 +00:00
drh
f2424c521b Begin moving WAL-specific I/O into the VFS. This checkin contains VFS 
infrastructure but it is untested and is not yet hooked up to the WAL.
The version number is bumped to 3.7.0 because of the VFS extension.

FossilOrigin-Name: f5e615c28c7035a7e6d896790b51cf9bc7371d5f
 2010-04-26 00:04:55 +00:00
dan
7c24610e64 Import experimental write-ahead-logging code. 
FossilOrigin-Name: 409d61baeb0a19d1700c973f16c8acef7b8506cd
 2010-04-12 19:00:29 +00:00
drh
f8b4d8c682 Adjustments to #ifdefs so that the #include of <sys/mount.h> is not included 
twice, because that confuses the amalgamation builder.

FossilOrigin-Name: 27413fc8dd52b754b4be9344a66bb9e0d752d48e
 2010-03-05 13:53:22 +00:00
drh
84a2bf67d8 Adjust some #ifdefs so that the build works on Mac both with and without 
SQLITE_ENABLE_LOCKING_STYLE.

FossilOrigin-Name: 0cc981f1ccc2c99b87eb968590ad18b2d3ebf37b
 2010-03-05 13:41:06 +00:00