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/* cygtls.cc
Copyright 2003, 2004 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"
#include "thread.h"
#include "cygtls.h"
#include "assert.h"
#include <syslog.h>
#include <signal.h>
#include "exceptions.h"
#include "sync.h"
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygthread.h"
#include "pinfo.h"
#include "sigproc.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 (HEAP_TLS, cygheap->sthreads,
sizeof (cygheap->threadlist[0]));
}
new_muto1 (sentry::lock, sentry_lock);
}
void
_cygtls::set_state (bool is_exception)
{
initialized = CYGTLS_INITIALIZED + is_exception;
}
void
_cygtls::reset_exception ()
{
if (initialized == CYGTLS_EXCEPTION)
{
#ifdef DEBUGGING
debug_printf ("resetting stack after an exception stack %p, stackptr %p", stack, stackptr);
#endif
set_state (false);
}
}
/* Two calls to get the stack right... */
void
_cygtls::call (DWORD (*func) (void *, void *), void *arg)
{
char buf[CYGTLS_PADSIZE];
call2 (func, arg, buf);
}
void
_cygtls::call2 (DWORD (*func) (void *, void *), void *arg, void *buf)
{
exception_list except_entry;
/* Initialize this thread's ability to respond to things like
SIGSEGV or SIGFPE. */
init_exceptions (&except_entry);
_my_tls.init_thread (buf, func);
DWORD res = func (arg, buf);
_my_tls.remove (INFINITE);
ExitThread (res);
}
void
_cygtls::init_thread (void *x, DWORD (*func) (void *, void *))
{
if (x)
{
memset (this, 0, CYGTLS_PADSIZE);
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;
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);
}
set_state (false);
errno_addr = &(local_clib._errno);
if ((void *) func == (void *) cygthread::stub
|| (void *) func == (void *) cygthread::simplestub)
return;
sentry here (INFINITE);
if (nthreads >= cygheap->sthreads)
{
cygheap->threadlist = (_cygtls **)
crealloc (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 = 0;
wq.thread_ev = NULL;
}
void
_cygtls::remove (DWORD wait)
{
debug_printf ("wait %p\n", wait);
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, bool exception)
{
if (exception)
lock ();
*stackptr++ = (__stack_t) addr;
if (exception)
unlock ();
set_state (exception);
}
#define BAD_IX ((size_t) -1)
static size_t NO_COPY threadlist_ix = BAD_IX;
_cygtls *
_cygtls::find_tls (int sig)
{
debug_printf ("sig %d\n", sig);
sentry here (INFINITE);
__asm__ volatile (".equ _threadlist_exception_return,.");
_cygtls *res = NULL;
for (threadlist_ix = 0; threadlist_ix < nthreads; threadlist_ix++)
if (sigismember (&(cygheap->threadlist[threadlist_ix]->sigwait_mask), sig))
{
res = cygheap->threadlist[threadlist_ix];
break;
}
threadlist_ix = BAD_IX;
return res;
}
void
_cygtls::set_siginfo (sigpacket *pack)
{
infodata = pack->si;
}
extern "C" DWORD __stdcall RtlUnwind (void *, void *, void *, DWORD);
static int
handle_threadlist_exception (EXCEPTION_RECORD *e, void *frame, CONTEXT *, void *)
{
if (e->ExceptionCode != STATUS_ACCESS_VIOLATION)
{
system_printf ("handle_threadlist_exception called with exception code %d\n",
e->ExceptionCode);
return 1;
}
sentry here;
if (threadlist_ix == BAD_IX)
{
system_printf ("handle_threadlist_exception called with threadlist_ix %d\n",
BAD_IX);
return 1;
}
if (!here.acquired ())
{
system_printf ("handle_threadlist_exception couldn't aquire muto\n");
return 1;
}
extern void *threadlist_exception_return;
cygheap->threadlist[threadlist_ix]->remove (INFINITE);
threadlist_ix = 0;
RtlUnwind (frame, threadlist_exception_return, e, 0);
return 0;
}
void
_cygtls::init_threadlist_exceptions (exception_list *el)
{
extern void init_exception_handler (exception_list *, exception_handler *);
init_exception_handler (el, handle_threadlist_exception);
}
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