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Drop has_set_thread_stack_guarantee flag

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This commit is contained in:
Corinna Vinschen
2015-12-15 16:00:20 +01:00
parent 8b8c6c014b
commit 23a556f2c5
6 changed files with 37 additions and 72 deletions
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84
winsup/cygwin/miscfuncs.cc
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@@ -609,10 +609,9 @@ pthread_wrapper (PVOID arg)
The below assembler code will release the OS stack after switching to our
new stack. */
wrapper_arg.stackaddr = dealloc_addr;
/* On post-XP systems, set thread stack guarantee matching the guardsize.
/* Set thread stack guarantee matching the guardsize.
Note that the guardsize is one page bigger than the guarantee. */
if (wincap.has_set_thread_stack_guarantee ()
&& wrapper_arg.guardsize > wincap.def_guard_page_size ())
if (wrapper_arg.guardsize > wincap.def_guard_page_size ())
{
wrapper_arg.guardsize -= wincap.page_size ();
SetThreadStackGuarantee (&wrapper_arg.guardsize);
@@ -877,59 +876,38 @@ CygwinCreateThread (LPTHREAD_START_ROUTINE thread_func, PVOID thread_arg,
#endif
if (!real_stackaddr)
return NULL;
/* Set up committed region. We have two cases: */
if (!wincap.has_set_thread_stack_guarantee ()
&& real_guardsize != wincap.def_guard_page_size ())
/* Set up committed region. We set up the stack like the OS does,
with a reserved region, the guard pages, and a commited region.
We commit the stack commit size from the executable header, but
at least PTHREAD_STACK_MIN (64K). */
static ULONG exe_commitsize;
if (!exe_commitsize)
{
/* If guardsize is set to something other than the default guard page
size, and if we're running on Windows XP 32 bit, we commit the
entire stack, and, if guardsize is > 0, set up a guard page. */
real_stacklimit = (PBYTE) real_stackaddr + wincap.page_size ();
if (real_guardsize
&& !VirtualAlloc (real_stacklimit, real_guardsize, MEM_COMMIT,
PAGE_READWRITE | PAGE_GUARD))
goto err;
real_stacklimit += real_guardsize;
if (!VirtualAlloc (real_stacklimit, real_stacksize - real_guardsize
- wincap.page_size (),
MEM_COMMIT, PAGE_READWRITE))
goto err;
PIMAGE_DOS_HEADER dosheader;
PIMAGE_NT_HEADERS ntheader;
dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
ntheader = (PIMAGE_NT_HEADERS)
((PBYTE) dosheader + dosheader->e_lfanew);
exe_commitsize = ntheader->OptionalHeader.SizeOfStackCommit;
exe_commitsize = roundup2 (exe_commitsize, wincap.page_size ());
}
else
{
/* Otherwise we set up the stack like the OS does, with a reserved
region, the guard pages, and a commited region. We commit the
stack commit size from the executable header, but at least
PTHREAD_STACK_MIN (64K). */
static ULONG exe_commitsize;
ULONG commitsize = exe_commitsize;
if (commitsize > real_stacksize - real_guardsize - wincap.page_size ())
commitsize = real_stacksize - real_guardsize - wincap.page_size ();
else if (commitsize < PTHREAD_STACK_MIN)
commitsize = PTHREAD_STACK_MIN;
real_stacklimit = (PBYTE) real_stackaddr + real_stacksize
- commitsize - real_guardsize;
if (!VirtualAlloc (real_stacklimit, real_guardsize, MEM_COMMIT,
PAGE_READWRITE | PAGE_GUARD))
goto err;
real_stacklimit += real_guardsize;
if (!VirtualAlloc (real_stacklimit, commitsize, MEM_COMMIT,
PAGE_READWRITE))
goto err;
if (!exe_commitsize)
{
PIMAGE_DOS_HEADER dosheader;
PIMAGE_NT_HEADERS ntheader;
dosheader = (PIMAGE_DOS_HEADER) GetModuleHandle (NULL);
ntheader = (PIMAGE_NT_HEADERS)
((PBYTE) dosheader + dosheader->e_lfanew);
exe_commitsize = ntheader->OptionalHeader.SizeOfStackCommit;
exe_commitsize = roundup2 (exe_commitsize, wincap.page_size ());
}
ULONG commitsize = exe_commitsize;
if (commitsize > real_stacksize - real_guardsize
- wincap.page_size ())
commitsize = real_stacksize - real_guardsize - wincap.page_size ();
else if (commitsize < PTHREAD_STACK_MIN)
commitsize = PTHREAD_STACK_MIN;
real_stacklimit = (PBYTE) real_stackaddr + real_stacksize
- commitsize - real_guardsize;
if (!VirtualAlloc (real_stacklimit, real_guardsize,
MEM_COMMIT, PAGE_READWRITE | PAGE_GUARD))
goto err;
real_stacklimit += real_guardsize;
if (!VirtualAlloc (real_stacklimit, commitsize, MEM_COMMIT,
PAGE_READWRITE))
goto err;
}
wrapper_arg->stackaddr = (PBYTE) real_stackaddr;
wrapper_arg->stackbase = (PBYTE) real_stackaddr + real_stacksize;
wrapper_arg->stacklimit = real_stacklimit;