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Overview
| Comment: | Use preprocessor macros to automatically detect whether or not posix_allocate() is available. (It is generally available on Linux but not on Mac.) Ticket [5eaa61ea1881040b17449ca043b6f8fd9ca55dc3] |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | tkt-5eaa61ea18 |
| Files: | files | file ages | folders |
| SHA1: |
597333f1024092b94bcd8772541e19a0 |
| User & Date: | drh 2012-11-13 11:08:49.725 |
Context
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2012-11-13
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| 11:16 | Strive to use posix_fallocate() rather than ftruncate() when posix_fallocate() is available. Ticket [5eaa61ea18]. (check-in: 29980b08ec user: drh tags: trunk) | |
| 11:08 | Use preprocessor macros to automatically detect whether or not posix_allocate() is available. (It is generally available on Linux but not on Mac.) Ticket [5eaa61ea1881040b17449ca043b6f8fd9ca55dc3] (Closed-Leaf check-in: 597333f102 user: drh tags: tkt-5eaa61ea18) | |
| 10:54 | When available, use posix_fallocate() rather than ftruncate() to allocate space for mmap()ed -shm files, since posix_fallocate() gives an error if no disk space is available whereas ftruncate() is silent and leaves the system vulnerable to a SIGBUS upon first write to the mmap()ed region. Ticket [5eaa61ea1881040b17449ca043b6f8fd9ca55dc3] (check-in: 356259617c user: drh tags: tkt-5eaa61ea18) | |
Changes
Changes to src/os_unix.c.
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41 42 43 44 45 46 47 48 49 50 51 52 53 54 | ** * sqlite3_vfs method implementations. ** * Locking primitives for the proxy uber-locking-method. (MacOSX only) ** * Definitions of sqlite3_vfs objects for all locking methods ** plus implementations of sqlite3_os_init() and sqlite3_os_end(). */ #include "sqliteInt.h" #if SQLITE_OS_UNIX /* This file is used on unix only */ /* ** There are various methods for file locking used for concurrency ** control: ** ** 1. POSIX locking (the default), ** 2. No locking, | > > > > > > > | 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
** * sqlite3_vfs method implementations.
** * Locking primitives for the proxy uber-locking-method. (MacOSX only)
** * Definitions of sqlite3_vfs objects for all locking methods
** plus implementations of sqlite3_os_init() and sqlite3_os_end().
*/
#include "sqliteInt.h"
#if SQLITE_OS_UNIX /* This file is used on unix only */
/* Use posix_fallocate() if it is available
*/
#if !defined(HAVE_POSIX_FALLOCATE) \
&& (_XOPEN_SOURCE >= 600 || _POSIX_C_SOURCE >= 200112L)
# define HAVE_POSIX_FALLOCATE 1
#endif
/*
** There are various methods for file locking used for concurrency
** control:
**
** 1. POSIX locking (the default),
** 2. No locking,
|
| ︙ | ︙ |