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added QSE_FIO_NOCACHE.

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map QSE_FIO_SEQUENTIAL and QSE_FIO_RANDOM to some posix_fadvise flags if available
This commit is contained in:
hyung-hwan 2011-11-10 13:45:07 +00:00
parent 595aab7555
commit 1e36d2c141
2 changed files with 19 additions and 2 deletions
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5
qse/include/qse/cmn/fio.h
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@ -59,9 +59,10 @@ enum qse_fio_open_flag_t
QSE_FIO_NOSHRD = (1 << 24), QSE_FIO_NOSHRD = (1 << 24),
QSE_FIO_NOSHWR = (1 << 25), QSE_FIO_NOSHWR = (1 << 25),
/* for WIN32 only. harmless(no effect) when used on other platforms */ /* hints to OS. harmless(no effect) when used on unsupported platforms */
QSE_FIO_RANDOM = (1 << 26), /* hint that access be random */ QSE_FIO_RANDOM = (1 << 26), /* hint that access be random */
QSE_FIO_SEQUENTIAL = (1 << 27) /* hint that access is sequential */ QSE_FIO_SEQUENTIAL = (1 << 27), /* hint that access is sequential */
QSE_FIO_NOCACHE = (1 << 28) /* no system I/O cache */
}; };
enum qse_fio_std_t enum qse_fio_std_t

16
qse/lib/cmn/fio.c
View File

@ -155,6 +155,8 @@ int qse_fio_init (
flag_and_attr |= FILE_FLAG_RANDOM_ACCESS; flag_and_attr |= FILE_FLAG_RANDOM_ACCESS;
if (flags & QSE_FIO_SEQUENTIAL) if (flags & QSE_FIO_SEQUENTIAL)
flag_and_attr |= FILE_FLAG_SEQUENTIAL_SCAN; flag_and_attr |= FILE_FLAG_SEQUENTIAL_SCAN;
if (flags & QSE_FIO_NOCACHE)
flag_and_attr |= FILE_FLAG_NO_BUFFERING;
handle = CreateFile ( handle = CreateFile (
path, desired_access, share_mode, path, desired_access, share_mode,
@ -369,6 +371,20 @@ int qse_fio_init (
if (handle == -1) return -1; if (handle == -1) return -1;
/* set some file access hints */
#if defined(POSIX_FADV_RANDOM)
if (flags & QSE_FIO_RANDOM)
posix_fadvise (handle, 0, 0, POSIX_FADV_RANDOM);
#endif
#if defined(POSIX_FADV_SEQUENTIAL)
if (flags & QSE_FIO_SEQUENTIAL)
posix_fadvise (handle, 0, 0, POSIX_FADV_SEQUENTIAL);
#endif
#if defined(POSIX_FADV_DONTNEED)
if (flags & QSE_FIO_NOCACHE)
posix_fadvise (handle, 0, 0, POSIX_FADV_DONTNEED);
#endif
#endif #endif
if (flags & QSE_FIO_TEXT) if (flags & QSE_FIO_TEXT)