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Overview
| Comment: | Fix another typo in howtocorrupt.html |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
2b9db23f51cbc0431194aa36d659e9d9 |
| User & Date: | drh 2016-07-22 15:42:06 |
Context
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2016-07-23
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| 14:58 | Mention the sqlite3_expanded_sql() and sqlite3_trace_v2() interfaces in the change log. check-in: eecfde6ba8 user: drh tags: trunk | |
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2016-07-22
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| 15:42 | Fix another typo in howtocorrupt.html check-in: 2b9db23f51 user: drh tags: trunk | |
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2016-07-20
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| 19:51 | Fix typo in the how-to-corrupt document. check-in: d23e6d047a user: mistachkin tags: trunk | |
Changes
Changes to pages/howtocorrupt.in.
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made. Hence, recent versions of SQLite will subtly malfunction and may
corrupt database files if used in multi-threaded application that run
on older linux systems that make use of LinuxThreads.</p>
<h3>6.2 Failures of mmap() on QNX</h3>
<p>There exists some subtle problem with mmap() on QNX such that making
a second mmap() call against the a single file descriptor can cause
the memory obtained from the first mmap() call to be zeroed. SQLite on
unix uses mmap() to create a shared memory region for transaction
coordination in [WAL | WAL mode], and it will call mmap() multiple times
for large transactions. The QNX mmap() has been demonstrated to corrupt
database file under that scenario. QNX engineers are aware of this problem
and are working on a solution; the problem may have already been fixed by
the time you read this.</p>
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363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 |
made. Hence, recent versions of SQLite will subtly malfunction and may corrupt database files if used in multi-threaded application that run on older linux systems that make use of LinuxThreads.</p> <h3>6.2 Failures of mmap() on QNX</h3> <p>There exists some subtle problem with mmap() on QNX such that making a second mmap() call against a single file descriptor can cause the memory obtained from the first mmap() call to be zeroed. SQLite on unix uses mmap() to create a shared memory region for transaction coordination in [WAL | WAL mode], and it will call mmap() multiple times for large transactions. The QNX mmap() has been demonstrated to corrupt database file under that scenario. QNX engineers are aware of this problem and are working on a solution; the problem may have already been fixed by the time you read this.</p> |