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/* cygtls.cc
Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Red Hat, Inc.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#define USE_SYS_TYPES_FD_SET
#include "cygtls.h"
#include <syslog.h>
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#include "exception.h"
class sentry
{
static muto lock;
int destroy;
public:
void init ();
bool acquired () {return lock.acquired ();}
sentry () {destroy = 0;}
sentry (DWORD wait) {destroy = lock.acquire (wait);}
~sentry () {if (destroy) lock.release ();}
friend void _cygtls::init ();
};
muto NO_COPY sentry::lock;
static size_t NO_COPY nthreads;
#define THREADLIST_CHUNK 256
void
_cygtls::init ()
{
if (cygheap->threadlist)
memset (cygheap->threadlist, 0, cygheap->sthreads * sizeof (cygheap->threadlist[0]));
else
{
cygheap->sthreads = THREADLIST_CHUNK;
cygheap->threadlist = (_cygtls **) ccalloc_abort (HEAP_TLS, cygheap->sthreads,
sizeof (cygheap->threadlist[0]));
}
sentry::lock.init ("sentry_lock");
}
/* Two calls to get the stack right... */
void
_cygtls::call (DWORD (*func) (void *, void *), void *arg)
{
char buf[CYGTLS_PADSIZE];
/* Initialize this thread's ability to respond to things like
SIGSEGV or SIGFPE. */
exception protect;
_my_tls.call2 (func, arg, buf);
}
void
_cygtls::call2 (DWORD (*func) (void *, void *), void *arg, void *buf)
{
init_thread (buf, func);
DWORD res = func (arg, buf);
remove (INFINITE);
/* Don't call ExitThread on the main thread since we may have been
dynamically loaded. */
if ((void *) func != (void *) dll_crt0_1
&& (void *) func != (void *) dll_dllcrt0_1)
ExitThread (res);
}
void
_cygtls::init_thread (void *x, DWORD (*func) (void *, void *))
{
if (x)
{
memset (this, 0, sizeof (*this));
stackptr = stack;
if (_GLOBAL_REENT)
{
local_clib._stdin = _GLOBAL_REENT->_stdin;
local_clib._stdout = _GLOBAL_REENT->_stdout;
local_clib._stderr = _GLOBAL_REENT->_stderr;
local_clib.__sdidinit = _GLOBAL_REENT->__sdidinit ? -1 : 0;
local_clib.__cleanup = _GLOBAL_REENT->__cleanup;
local_clib.__sglue._niobs = 3;
local_clib.__sglue._iobs = &_GLOBAL_REENT->__sf[0];
}
local_clib._current_locale = "C";
locals.process_logmask = LOG_UPTO (LOG_DEBUG);
}
thread_id = GetCurrentThreadId ();
initialized = CYGTLS_INITIALIZED;
errno_addr = &(local_clib._errno);
if ((void *) func == (void *) cygthread::stub
|| (void *) func == (void *) cygthread::simplestub)
return;
cygheap->user.reimpersonate ();
sentry here (INFINITE);
if (nthreads >= cygheap->sthreads)
{
cygheap->threadlist = (_cygtls **)
crealloc_abort (cygheap->threadlist, (cygheap->sthreads += THREADLIST_CHUNK)
* sizeof (cygheap->threadlist[0]));
memset (cygheap->threadlist + nthreads, 0, THREADLIST_CHUNK * sizeof (cygheap->threadlist[0]));
}
cygheap->threadlist[nthreads++] = this;
}
void
_cygtls::fixup_after_fork ()
{
if (sig)
{
pop ();
sig = 0;
}
stacklock = spinning = 0;
locals.select.sockevt = NULL;
wq.thread_ev = NULL;
}
#define free_local(x) \
if (locals.x) \
{ \
free (locals.x); \
locals.x = NULL; \
}
void
_cygtls::remove (DWORD wait)
{
initialized = 0;
if (exit_state >= ES_FINAL)
return;
debug_printf ("wait %p", wait);
if (wait)
{
/* FIXME: Need some sort of atthreadexit function to allow things like
select to control this themselves. */
if (locals.select.sockevt)
{
CloseHandle (locals.select.sockevt);
locals.select.sockevt = NULL;
free_local (select.ser_num);
free_local (select.w4);
}
free_local (process_ident);
free_local (ntoa_buf);
free_local (protoent_buf);
free_local (servent_buf);
free_local (hostent_buf);
}
/* Free temporary TLS path buffers. */
locals.pathbufs.destroy ();
do
{
sentry here (wait);
if (here.acquired ())
{
for (size_t i = 0; i < nthreads; i++)
if (this == cygheap->threadlist[i])
{
if (i < --nthreads)
cygheap->threadlist[i] = cygheap->threadlist[nthreads];
debug_printf ("removed %p element %d", this, i);
break;
}
}
} while (0);
remove_wq (wait);
}
void
_cygtls::push (__stack_t addr)
{
*stackptr++ = (__stack_t) addr;
}
_cygtls *
_cygtls::find_tls (int sig)
{
static int NO_COPY threadlist_ix;
debug_printf ("sig %d\n", sig);
sentry here (INFINITE);
_cygtls *res = NULL;
threadlist_ix = -1;
myfault efault;
if (efault.faulted ())
cygheap->threadlist[threadlist_ix]->remove (INFINITE);
while (++threadlist_ix < (int) nthreads)
if (sigismember (&(cygheap->threadlist[threadlist_ix]->sigwait_mask), sig))
{
res = cygheap->threadlist[threadlist_ix];
break;
}
return res;
}
void
_cygtls::set_siginfo (sigpacket *pack)
{
infodata = pack->si;
}
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