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* DevNotes: Add entry cgf-000014.

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* cygheap.cc (tls_sentry): Move here, rename from 'sentry' in cygtls.cc
(tls_sentry::lock): Ditto.
(nthreads): Move from cygtls.cc
(THREADLIST_CHUNK): Ditto.
(cygheap_init): Call init_tls_list().
(init_cygheap::init_tls_list): Define new function.
(init_cygheap::add_tls): Ditto.
(init_cygheap::remove_tls): Ditto.
(init_cygheap::find_tls): Ditto.  Semi-resurrect from _cygtls::find_tls.
* cygheap.h (init_cygheap::init_tls_list): Declare new function.
(init_cygheap::add_tls): Ditto.
(init_cygheap::remove_tls): Ditto.
(init_cygheap::find_tls): Ditto.
* cygtls.cc (sentry): Delete.
(sentry::lock): Ditto.
(nthreads): Ditto.
(THREADLIST_CHUNK): Ditto.
(_cygtls::init): Delete definition.
(_cygtls::init_thread): Call cygheap->add_tls() to add thread to global list.
(_cygtls::remove): cygheap->remove_tls() to remove thread from global list.
* cygtls.h (_cygtls::init): Delete declaration.
* dcrt0.cc (dll_crt0_0): Delete call to _cygtls::init().
* exceptions.cc (sigpacket::process): When no thread is specified, try to find
one via cygheap->find_tls.
This commit is contained in:
Christopher Faylor
2012-08-09 19:58:53 +00:00
parent cc02df1286
commit 52d2371da5
9 changed files with 153 additions and 67 deletions
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99
winsup/cygwin/cygheap.cc
View File

@@ -47,6 +47,23 @@ struct cygheap_entry
char data[0];
};
class tls_sentry
{
public:
static muto lock;
int destroy;
void init ();
bool acquired () {return lock.acquired ();}
tls_sentry () {destroy = 0;}
tls_sentry (DWORD wait) {destroy = lock.acquire (wait);}
~tls_sentry () {if (destroy) lock.release ();}
};
muto NO_COPY tls_sentry::lock;
static NO_COPY size_t nthreads;
#define THREADLIST_CHUNK 256
#define NBUCKETS (sizeof (cygheap->buckets) / sizeof (cygheap->buckets[0]))
#define N0 ((_cmalloc_entry *) NULL)
#define to_cmalloc(s) ((_cmalloc_entry *) (((char *) (s)) - (unsigned) (N0->data)))
@@ -256,6 +273,7 @@ cygheap_init ()
cygheap->fdtab.init ();
if (!cygheap->sigs)
sigalloc ();
cygheap->init_tls_list ();
}
/* Copyright (C) 1997, 2000 DJ Delorie */
@@ -545,3 +563,84 @@ cygheap_user::set_name (const char *new_name)
cfree_and_set (pdomain);
cfree_and_set (pwinname);
}
void
init_cygheap::init_tls_list ()
{
if (threadlist)
memset (cygheap->threadlist, 0, cygheap->sthreads * sizeof (cygheap->threadlist[0]));
else
{
sthreads = THREADLIST_CHUNK;
threadlist = (_cygtls **) ccalloc_abort (HEAP_TLS, cygheap->sthreads,
sizeof (cygheap->threadlist[0]));
}
tls_sentry::lock.init ("thread_tls_sentry");
}
void
init_cygheap::add_tls (_cygtls *t)
{
cygheap->user.reimpersonate ();
tls_sentry here (INFINITE);
if (nthreads >= cygheap->sthreads)
{
threadlist = (_cygtls **)
crealloc_abort (threadlist, (sthreads += THREADLIST_CHUNK)
* sizeof (threadlist[0]));
// memset (threadlist + nthreads, 0, THREADLIST_CHUNK * sizeof (threadlist[0]));
}
threadlist[nthreads++] = t;
}
void
init_cygheap::remove_tls (_cygtls *t, DWORD wait)
{
tls_sentry here (wait);
if (here.acquired ())
{
for (size_t i = 0; i < nthreads; i++)
if (t == threadlist[i])
{
if (i < --nthreads)
threadlist[i] = threadlist[nthreads];
debug_only_printf ("removed %p element %d", this, i);
break;
}
}
}
_cygtls *
init_cygheap::find_tls (int sig)
{
debug_printf ("sig %d\n", sig);
tls_sentry here (INFINITE);
static int NO_COPY threadlist_ix;
_cygtls *t = _main_tls;
myfault efault;
if (efault.faulted ())
threadlist[threadlist_ix]->remove (INFINITE);
else
{
threadlist_ix = -1;
while (++threadlist_ix < (int) nthreads)
if (sigismember (&(threadlist[threadlist_ix]->sigwait_mask), sig))
{
t = cygheap->threadlist[threadlist_ix];
goto out;
}
threadlist_ix = -1;
while (++threadlist_ix < (int) nthreads)
if (!sigismember (&(threadlist[threadlist_ix]->sigmask), sig))
{
t = cygheap->threadlist[threadlist_ix];
break;
}
}
out:
return t;
}