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Expand on the comment above OP_Destroy to explain why it throws an error if

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there are any active reader VMs.

FossilOrigin-Name: b9a8c2b9bec9f537b2d5aff6659a5748b1f70b53519a1f9dfceb5209154eca8e
This commit is contained in:
dan 2017-04-08 14:11:47 +00:00
parent 5b09d13a58
commit a34adaf667
3 changed files with 18 additions and 11 deletions
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12
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@ -1,5 +1,5 @@
C Have\sthe\srtree\smodule\sclose\sany\sopen\sblob-handle\swithin\sthe\sxSavepoint\smethod.\nThis\sprevents\ssuch\san\sopen\sblob\shandle\sfrom\sinterfering\swith\sDROP\sTABLE\noperations.
D 2017-04-08T13:52:41.332
C Expand\son\sthe\scomment\sabove\sOP_Destroy\sto\sexplain\swhy\sit\sthrows\san\serror\sif\nthere\sare\sany\sactive\sreader\sVMs.
D 2017-04-08T14:11:47.626
F Makefile.in 1cc758ce3374a32425e4d130c2fe7b026b20de5b8843243de75f087c0a2661fb
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@ -468,7 +468,7 @@ F src/update.c 456d4a4656f8a03c2abc88a51b19172197400e58
F src/utf.c 699001c79f28e48e9bcdf8a463da029ea660540c
F src/util.c ca8440ede81e155d15cff7c101654f60b55a9ae6
F src/vacuum.c 1fe4555cd8c9b263afb85b5b4ee3a4a4181ad569
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F src/vdbeInt.h 5db089ce18c4feff8820ec6e4cac2d2c82e03d4b1d96f10a6e43832147b8dffe
F src/vdbeapi.c 5b08d82592bcff4470601fe78aaabebd50837860
@ -1570,7 +1570,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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fa4416adc2a9a3a80db1d5befc0b95c3d0fc41affe38f7f2f45cdfae3f1b49eb
b9a8c2b9bec9f537b2d5aff6659a5748b1f70b53519a1f9dfceb5209154eca8e

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src/vdbe.c
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@ -5386,10 +5386,17 @@ case OP_IdxGE: { /* jump */
** might be moved into the newly deleted root page in order to keep all
** root pages contiguous at the beginning of the database. The former
** value of the root page that moved - its value before the move occurred -
** is stored in register P2. If no page
** movement was required (because the table being dropped was already
** the last one in the database) then a zero is stored in register P2.
** If AUTOVACUUM is disabled then a zero is stored in register P2.
** is stored in register P2. If no page movement was required (because the
** table being dropped was already the last one in the database) then a
** zero is stored in register P2. If AUTOVACUUM is disabled then a zero
** is stored in register P2.
**
** This opcode throws an error if there are any active reader VMs when
** it is invoked. This is done to avoid the difficulty associated with
** updating existing cursors when a root page is moved in an AUTOVACUUM
** database. This error is thrown even if the database is not an AUTOVACUUM
** db in order to avoid introducing an incompatibility between autovacuum
** and non-autovacuum modes.
**
** See also: Clear
*/