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* dcrt0.cc (cygwin_dll_init): Now initializes main_environ and cygtls. Comment

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to explain the caveats of this method.
* how-cygtls-works.txt: New file.
This commit is contained in:
Christopher Faylor
2005-06-04 02:11:50 +00:00
parent 15c04fd16e
commit 6e780c8bf5
4 changed files with 95 additions and 3 deletions
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13
winsup/cygwin/dcrt0.cc
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@@ -955,7 +955,15 @@ dll_crt0 (per_process *uptr)
_dll_crt0 ();
}
/* This must be called by anyone who uses LoadLibrary to load cygwin1.dll */
/* This must be called by anyone who uses LoadLibrary to load cygwin1.dll.
* You must have CYGTLS_PADSIZE bytes reserved at the bottom of the stack
* calling this function, and that storage must not be overwritten until you
* unload cygwin1.dll, as it is used for _my_tls. It is best to load
* cygwin1.dll before spawning any additional threads in your process.
*
* See winsup/testsuite/cygload for an example of how to use cygwin1.dll
* from MSVC and non-cygwin MinGW applications.
*/
extern "C" void
cygwin_dll_init ()
{
@@ -974,6 +982,9 @@ cygwin_dll_init ()
user_data->envptr = &envp;
user_data->fmode_ptr = &_fmode;
main_environ = user_data->envptr;
*main_environ = NULL;
initialize_main_tls((char *)&_my_tls);
dll_crt0_1 (NULL);
}