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minix/lib/libc/thread-stub/thread-stub.c
Ben Gras 2fe8fb192f Full switch to clang/ELF. Drop ack. Simplify. 
There is important information about booting non-ack images in
docs/UPDATING. ack/aout-format images can't be built any more, and
booting clang/ELF-format ones is a little different. Updating to the
new boot monitor is recommended.

Changes in this commit:

	. drop boot monitor -> allowing dropping ack support
	. facility to copy ELF boot files to /boot so that old boot monitor
	  can still boot fairly easily, see UPDATING
	. no more ack-format libraries -> single-case libraries
	. some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases
	. drop several ack toolchain commands, but not all support
	  commands (e.g. aal is gone but acksize is not yet).
	. a few libc files moved to netbsd libc dir
	. new /bin/date as minix date used code in libc/
	. test compile fix
	. harmonize includes
	. /usr/lib is no longer special: without ack, /usr/lib plays no
	  kind of special bootstrapping role any more and bootstrapping
	  is done exclusively through packages, so releases depend even
	  less on the state of the machine making them now.
	. rename nbsd_lib* to lib*
	. reduce mtree
2012-02-14 14:52:02 +01:00

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/* $NetBSD: thread-stub.c,v 1.21 2009/01/30 23:21:03 ad Exp $ */
/*-
* Copyright (c) 2003, 2009 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: thread-stub.c,v 1.21 2009/01/30 23:21:03 ad Exp $");
#endif /* LIBC_SCCS and not lint */
/*
* Stubs for thread operations, for use when threads are not used by
* the application. See "reentrant.h" for details.
*/
#ifdef _REENTRANT
#define __LIBC_THREAD_STUBS
#include "namespace.h"
#include "reentrant.h"
#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
extern int __isthreaded;
#define DIE() (void)raise(SIGABRT)
#define CHECK_NOT_THREADED_ALWAYS() \
do { \
if (__isthreaded) \
DIE(); \
} while (/*CONSTCOND*/0)
#if 1
#define CHECK_NOT_THREADED() CHECK_NOT_THREADED_ALWAYS()
#else
#define CHECK_NOT_THREADED() /* nothing */
#endif
/* libpthread init */
void __libc_thr_init(void);
void __libc_thr_init_stub(void);
__weak_alias(__libc_thr_init,__libc_thr_init_stub)
void
__libc_thr_init_stub(void)
{
/* nothing, may be overridden by libpthread */
}
/* mutexes */
int __libc_mutex_init_stub(mutex_t *, const mutexattr_t *);
int __libc_mutex_catchall_stub(mutex_t *);
__weak_alias(__libc_mutex_init,__libc_mutex_init_stub)
__weak_alias(__libc_mutex_lock,__libc_mutex_catchall_stub)
__weak_alias(__libc_mutex_trylock,__libc_mutex_catchall_stub)
__weak_alias(__libc_mutex_unlock,__libc_mutex_catchall_stub)
__weak_alias(__libc_mutex_destroy,__libc_mutex_catchall_stub)
int __libc_mutexattr_catchall_stub(mutexattr_t *);
int __libc_mutexattr_settype_stub(mutexattr_t *, int);
__weak_alias(__libc_mutexattr_init,__libc_mutexattr_catchall_stub)
__weak_alias(__libc_mutexattr_destroy,__libc_mutexattr_catchall_stub)
__weak_alias(__libc_mutexattr_settype,__libc_mutexattr_settype_stub)
int
__libc_mutex_init_stub(mutex_t *m, const mutexattr_t *a)
{
/* LINTED deliberate lack of effect */
(void)m;
/* LINTED deliberate lack of effect */
(void)a;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_mutex_catchall_stub(mutex_t *m)
{
/* LINTED deliberate lack of effect */
(void)m;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_mutexattr_settype_stub(mutexattr_t *ma, int type)
{
/* LINTED deliberate lack of effect */
(void)ma;
/* LINTED deliberate lack of effect */
(void)type;
return (0);
}
int
__libc_mutexattr_catchall_stub(mutexattr_t *ma)
{
/* LINTED deliberate lack of effect */
(void)ma;
CHECK_NOT_THREADED();
return (0);
}
/* condition variables */
int __libc_cond_init_stub(cond_t *, const condattr_t *);
int __libc_cond_wait_stub(cond_t *, mutex_t *);
int __libc_cond_timedwait_stub(cond_t *, mutex_t *,
const struct timespec *);
int __libc_cond_catchall_stub(cond_t *);
__weak_alias(__libc_cond_init,__libc_cond_init_stub)
__weak_alias(__libc_cond_signal,__libc_cond_catchall_stub)
__weak_alias(__libc_cond_broadcast,__libc_cond_catchall_stub)
__weak_alias(__libc_cond_wait,__libc_cond_wait_stub)
__weak_alias(__libc_cond_timedwait,__libc_cond_timedwait_stub)
__weak_alias(__libc_cond_destroy,__libc_cond_catchall_stub)
int
__libc_cond_init_stub(cond_t *c, const condattr_t *a)
{
/* LINTED deliberate lack of effect */
(void)c;
/* LINTED deliberate lack of effect */
(void)a;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_cond_wait_stub(cond_t *c, mutex_t *m)
{
/* LINTED deliberate lack of effect */
(void)c;
/* LINTED deliberate lack of effect */
(void)m;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_cond_timedwait_stub(cond_t *c, mutex_t *m, const struct timespec *t)
{
/* LINTED deliberate lack of effect */
(void)c;
/* LINTED deliberate lack of effect */
(void)m;
/* LINTED deliberate lack of effect */
(void)t;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_cond_catchall_stub(cond_t *c)
{
/* LINTED deliberate lack of effect */
(void)c;
CHECK_NOT_THREADED();
return (0);
}
/* read-write locks */
int __libc_rwlock_init_stub(rwlock_t *, rwlockattr_t *);
int __libc_rwlock_catchall_stub(rwlock_t *);
__weak_alias(__libc_rwlock_init,__libc_rwlock_init_stub)
__weak_alias(__libc_rwlock_rdlock,__libc_rwlock_catchall_stub)
__weak_alias(__libc_rwlock_wrlock,__libc_rwlock_catchall_stub)
__weak_alias(__libc_rwlock_tryrdlock,__libc_rwlock_catchall_stub)
__weak_alias(__libc_rwlock_trywrlock,__libc_rwlock_catchall_stub)
__weak_alias(__libc_rwlock_unlock,__libc_rwlock_catchall_stub)
__weak_alias(__libc_rwlock_destroy,__libc_rwlock_catchall_stub)
int
__libc_rwlock_init_stub(rwlock_t *l, rwlockattr_t *a)
{
/* LINTED deliberate lack of effect */
(void)l;
/* LINTED deliberate lack of effect */
(void)a;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_rwlock_catchall_stub(rwlock_t *l)
{
/* LINTED deliberate lack of effect */
(void)l;
CHECK_NOT_THREADED();
return (0);
}
/*
* 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 *);
void *__libc_thr_getspecific_stub(thread_key_t);
int __libc_thr_keydelete_stub(thread_key_t);
__weak_alias(__libc_thr_keycreate,__libc_thr_keycreate_stub)
__weak_alias(__libc_thr_setspecific,__libc_thr_setspecific_stub)
__weak_alias(__libc_thr_getspecific,__libc_thr_getspecific_stub)
__weak_alias(__libc_thr_keydelete,__libc_thr_keydelete_stub)
int
__libc_thr_keycreate_stub(thread_key_t *k, void (*d)(void *))
{
int i;
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);
}
int
__libc_thr_setspecific_stub(thread_key_t k, const void *v)
{
__libc_tsd[k].tsd_val = __UNCONST(v);
return (0);
}
void *
__libc_thr_getspecific_stub(thread_key_t k)
{
return (__libc_tsd[k].tsd_val);
}
int
__libc_thr_keydelete_stub(thread_key_t k)
{
/*
* XXX Do not recycle key; see big comment in libpthread.
*/
__libc_tsd[k].tsd_dtor = NULL;
return (0);
}
/* misc. */
int __libc_thr_once_stub(once_t *, void (*)(void));
int __libc_thr_sigsetmask_stub(int, const sigset_t *, sigset_t *);
thr_t __libc_thr_self_stub(void);
int __libc_thr_yield_stub(void);
int __libc_thr_create_stub(thr_t *, const thrattr_t *,
void *(*)(void *), void *);
void __libc_thr_exit_stub(void *);
int *__libc_thr_errno_stub(void);
int __libc_thr_setcancelstate_stub(int, int *);
int __libc_thr_equal_stub(pthread_t, pthread_t);
unsigned int __libc_thr_curcpu_stub(void);
__weak_alias(__libc_thr_once,__libc_thr_once_stub)
__weak_alias(__libc_thr_sigsetmask,__libc_thr_sigsetmask_stub)
__weak_alias(__libc_thr_self,__libc_thr_self_stub)
__weak_alias(__libc_thr_yield,__libc_thr_yield_stub)
__weak_alias(__libc_thr_create,__libc_thr_create_stub)
__weak_alias(__libc_thr_exit,__libc_thr_exit_stub)
__weak_alias(__libc_thr_errno,__libc_thr_errno_stub)
__weak_alias(__libc_thr_setcancelstate,__libc_thr_setcancelstate_stub)
__weak_alias(__libc_thr_equal,__libc_thr_equal_stub)
__weak_alias(__libc_thr_curcpu,__libc_thr_curcpu_stub)
int
__libc_thr_once_stub(once_t *o, void (*r)(void))
{
/* XXX Knowledge of libpthread types. */
if (o->pto_done == 0) {
(*r)();
o->pto_done = 1;
}
return (0);
}
int
__libc_thr_sigsetmask_stub(int h, const sigset_t *s, sigset_t *o)
{
CHECK_NOT_THREADED();
return sigprocmask(h, s, o);
}
thr_t
__libc_thr_self_stub(void)
{
return ((thr_t) -1);
}
int
__libc_thr_yield_stub(void)
{
/* Nothing to do. */
return (0);
}
int
__libc_thr_create_stub(thr_t *tp, const thrattr_t *ta,
void *(*f)(void *), void *a)
{
/* LINTED deliberate lack of effect */
(void)tp;
/* LINTED deliberate lack of effect */
(void)ta;
/* LINTED deliberate lack of effect */
(void)f;
/* LINTED deliberate lack of effect */
(void)a;
DIE();
return (EOPNOTSUPP);
}
void
__libc_thr_exit_stub(void *v)
{
/* LINTED deliberate lack of effect */
(void)v;
exit(0);
}
int
__libc_thr_setcancelstate_stub(int new, int *old)
{
/* LINTED deliberate lack of effect */
(void)new;
/* LINTED deliberate lack of effect */
(void)old;
CHECK_NOT_THREADED();
return (0);
}
int
__libc_thr_equal_stub(pthread_t t1, pthread_t t2)
{
/* assert that t1=t2=pthread_self() */
return (t1 == t2);
}
int *
__libc_thr_errno_stub(void)
{
DIE();
return (NULL);
}
unsigned int
__libc_thr_curcpu_stub(void)
{
return (0);
}
#endif /* _REENTRANT */
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