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Simple TSD implementation, since some thread-safe libraries want 

to use it.
This commit is contained in:
thorpej 2003-01-20 01:58:54 +00:00
parent 486868997d
commit d504e2bb9c
1 changed files with 44 additions and 20 deletions
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64
lib/libc/thread-stub/thread-stub.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: thread-stub.c,v 1.6 2003/01/20 01:30:15 thorpej Exp $ */
/* $NetBSD: thread-stub.c,v 1.7 2003/01/20 01:58:54 thorpej Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
@ -238,7 +238,19 @@ __libc_rwlock_catchall_stub(rwlock_t *l)
}
/* thread-specific data */
/*
* thread-specific data; we need to actually provide a simple TSD
* implementation, since some thread-safe libraries want to use it.
*/
#define TSD_KEYS_MAX 64
static struct {
void *tsd_val;
void (*tsd_dtor)(void *);
int tsd_inuse;
} __libc_tsd[TSD_KEYS_MAX];
static int __libc_tsd_nextkey;
int __libc_thr_keycreate_stub(thread_key_t *, void (*)(void *));
int __libc_thr_setspecific_stub(thread_key_t, const void *);
@ -253,12 +265,29 @@ __weak_alias(__libc_thr_keydelete,__libc_thr_keydelete_stub)
int
__libc_thr_keycreate_stub(thread_key_t *k, void (*d)(void *))
{
/* LINTED deliberate lack of effect */
(void)k;
/* LINTED deliberate lack of effect */
(void)d;
int i;
CHECK_NOT_THREADED();
for (i = __libc_tsd_nextkey; i < TSD_KEYS_MAX; i++) {
if (__libc_tsd[i].tsd_inuse == 0)
goto out;
}
for (i = 0; i < __libc_tsd_nextkey; i++) {
if (__libc_tsd[i].tsd_inuse == 0)
goto out;
}
return (EAGAIN);
out:
/*
* XXX We don't actually do anything with the destructor. We
* XXX probably should.
*/
__libc_tsd[i].tsd_inuse = 1;
__libc_tsd_nextkey = (i + i) % TSD_KEYS_MAX;
__libc_tsd[i].tsd_dtor = d;
*k = i;
return (0);
}
@ -266,12 +295,9 @@ __libc_thr_keycreate_stub(thread_key_t *k, void (*d)(void *))
int
__libc_thr_setspecific_stub(thread_key_t k, const void *v)
{
/* LINTED deliberate lack of effect */
(void)k;
/* LINTED deliberate lack of effect */
(void)v;
DIE();
/* LINTED cast away const */
__libc_tsd[k].tsd_val = (void *) v;
return (0);
}
@ -279,21 +305,19 @@ __libc_thr_setspecific_stub(thread_key_t k, const void *v)
void *
__libc_thr_getspecific_stub(thread_key_t k)
{
/* LINTED deliberate lack of effect */
(void)k;
DIE();
return (NULL);
return (__libc_tsd[k].tsd_val);
}
int
__libc_thr_keydelete_stub(thread_key_t k)
{
/* LINTED deliberate lack of effect */
(void)k;
CHECK_NOT_THREADED();
/*
* XXX Do not recycle key; see big comment in libpthread.
*/
__libc_tsd[k].tsd_dtor = NULL;
return (0);
}