diff options
| author | Loren J. Rittle <ljrittle@acm.org> | 2001-06-12 23:09:09 +0000 |
|---|---|---|
| committer | Loren J. Rittle <ljrittle@gcc.gnu.org> | 2001-06-12 23:09:09 +0000 |
| commit | ddf1e65262a1843776d525cfa32fb5138e24951e (patch) | |
| tree | c1c7768a7c3fa4e6421e9078340dd04bd57fa444 /gcc/loop.c | |
| parent | 1d855e87fd1e2a8c68d86128616f4c2170800544 (diff) | |
| download | gcc-ddf1e65262a1843776d525cfa32fb5138e24951e.zip gcc-ddf1e65262a1843776d525cfa32fb5138e24951e.tar.gz gcc-ddf1e65262a1843776d525cfa32fb5138e24951e.tar.bz2 | |
porting.texi: Add documentation about libstdc++-v3-specific macros that are currently...
libstdc++/2071
* porting.texi: Add documentation about libstdc++-v3-specific
macros that are currently included in os_defines.h files.
* config/basic_file_stdio.h (sys_getc): New method.
(sys_ungetc): New method.
* include/bits/basic_file.h: (sys_getc): New method signature.
(sys_ungetc): New method signature.
* include/bits/fstream.tcc (underflow): Add conditional code
paths which avoid using short seeks on streams (especially
useful when the stream might be interactive or a pipe). At
the moment, this alternate path only avoids seeking when the
``buffer size'' of underflow() is 1 since the C standard only
guarantees buffer space for one ungetc (this technique could
be extended since *-*-solaris* supports buffering for 4 calls
to ungetc and *-*-*bsd* supports buffering limited only by
memory resources). Also, _GLIBCPP_AVOID_FSEEK must be defined
in a port's os_defines.h file for this alternate path to even
be considered. As a bonus, the idiom of using getc/ungetc
requires no system calls whereas fseek maps to one or two
system call(s) on many platforms.
* config/os/bsd/freebsd/bits/os_defines.h (_GLIBCPP_AVOID_FSEEK):
Define it.
* config/os/solaris/solaris2.5/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
* config/os/solaris/solaris2.6/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
* config/os/solaris/solaris2.7/bits/os_defines.h
(_GLIBCPP_AVOID_FSEEK): Likewise.
From-SVN: r43278
Diffstat (limited to 'gcc/loop.c')
0 files changed, 0 insertions, 0 deletions