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/* Copyright (C) 2021-2026 Free Software Foundation, Inc.
Contributed by Oracle.
This file is part of GNU Binutils.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "config.h"
#include <pthread.h>
#include "collector.h"
#include "libcol_util.h"
#include "tsd.h"
#include "memmgr.h"
/*
* Build our thread-specific-data support on pthread interfaces.
*/
#define MAXNKEYS 64 /* hard-wired? really? well, it depends only on us and we have a sense for how many keys we will use */
static pthread_key_t tsd_pkeys[MAXNKEYS];
static size_t tsd_sizes[MAXNKEYS];
static unsigned tsd_nkeys = 0;
int
__collector_tsd_init ()
{
return 0;
}
void
__collector_tsd_fini ()
{
Tprintf (DBG_LT1, "tsd_fini()\n");
while (tsd_nkeys)
{
tsd_nkeys--;
pthread_key_delete (tsd_pkeys[tsd_nkeys]);
tsd_sizes[tsd_nkeys] = 0; // should be unneeded
}
}
int
__collector_tsd_allocate ()
{
return 0;
}
void
__collector_tsd_release () { }
static void
tsd_destructor (void *p)
{
if (p)
__collector_freeCSize (__collector_heap, p, *((size_t *) p));
}
unsigned
__collector_tsd_create_key (size_t sz, void (*init)(void*), void (*fini)(void*))
{
/*
* We no longer support init and fini arguments (and weren't using them anyhow).
* Our hard-wired MAXNKEYS presumably is considerably higher than the number of keys we use.
*/
if (init || fini || (tsd_nkeys >= MAXNKEYS))
return COLLECTOR_TSD_INVALID_KEY;
/*
* A pthread key has a value that is (void *).
* We don't know where it is stored, and can access its value only through {get|set}specific.
* But libcollector expects a pointer to memory that it can modify.
* So we have to allocate that memory and store the pointer.
*
* For now, we just have to register a destructor that will free the memory
* when the thread finishes.
*/
if (pthread_key_create (&tsd_pkeys[tsd_nkeys], &tsd_destructor))
return COLLECTOR_TSD_INVALID_KEY;
tsd_sizes[tsd_nkeys] = sz;
tsd_nkeys++;
return (tsd_nkeys - 1);
}
void *
__collector_tsd_get_by_key (unsigned key_index)
{
if (key_index == COLLECTOR_TSD_INVALID_KEY)
return NULL;
if (key_index < 0 || key_index >= tsd_nkeys)
return NULL;
pthread_key_t key = tsd_pkeys[key_index];
size_t sz = tsd_sizes[key_index];
/*
* When we use __collector_freeCSize(), we need to know the
* size that had been allocated. So, stick a header to the
* front of the allocation to hold the size. The header could
* just be sizeof(size_t), but pad it to preserve alignment for
* the usable area.
*/
size_t header = 8;
void *value = pthread_getspecific (key);
// check whether we have allocated the memory
if (value == NULL)
{
// add room to record the size
value = __collector_allocCSize (__collector_heap, sz + header, 0);
if (value == NULL)
{
// do we need to guard against trying to alloc each time?
return NULL;
}
// write the size of the allocation
*((size_t *) value) = sz + header;
CALL_UTIL (memset)(((char *) value) + header, 0, sz);
// record the allocation for future retrieval
if (pthread_setspecific (key, value))
return NULL;
}
// return the pointer, skipping the header
return ((char *) value) +header;
}
void
__collector_tsd_fork_child_cleanup ()
{
__collector_tsd_fini ();
}
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