diff options
Diffstat (limited to 'winsup/cygwin/globals.cc')
| -rw-r--r-- | winsup/cygwin/globals.cc | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/winsup/cygwin/globals.cc b/winsup/cygwin/globals.cc index ef1753425..ccfc20830 100644 --- a/winsup/cygwin/globals.cc +++ b/winsup/cygwin/globals.cc @@ -72,7 +72,13 @@ char NO_COPY almost_null[1]; char *old_title; -/* Heavily-used const UNICODE_STRINGs are defined here once. */ +/* Heavily-used const UNICODE_STRINGs are defined here once. The idea is a + speed improvement by not having to initialize a UNICODE_STRING every time + we make a string comparison. The strings are not defined as const, + because the respective NT functions are not taking const arguments + and doing so here results in lots of extra casts for no good reason. + Rather, the strings are placed in the R/O section .rdata, so we get + a SEGV if some code erroneously tries to overwrite these strings. */ #define _ROU(_s) \ { Length: sizeof (_s) - sizeof (WCHAR), \ MaximumLength: sizeof (_s), \ |