d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
d630035127
freebsd-skq/lib/libc/gen/_pthread_stubs.c

328 lines
14 KiB
C
Raw Normal View History

Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
/*
* Copyright (c) 2001 Daniel Eischen <deischen@FreeBSD.org>.
* All rights reserved.
*
* 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 DANIEL EISCHEN 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 AUTHOR 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.
*/
Fix SCM ID's.
2002-02-01 00:57:29 +00:00
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
Bring in a hybrid of SunSoft's transport-independent RPC (TI-RPC) and associated changes that had to happen to make this possible as well as bugs fixed along the way. Bring in required TLI library routines to support this. Since we don't support TLI we've essentially copied what NetBSD has done, adding a thin layer to emulate direct the TLI calls into BSD socket calls. This is mostly from Sun's tirpc release that was made in 1994, however some fixes were backported from the 1999 release (supposedly only made available after this porting effort was underway). The submitter has agreed to continue on and bring us up to the 1999 release. Several key features are introduced with this update: Client calls are thread safe. (1999 code has server side thread safe) Updated, a more modern interface. Many userland updates were done to bring the code up to par with the recent RPC API. There is an update to the pthreads library, a function pthread_main_np() was added to emulate a function of Sun's threads library. While we're at it, bring in NetBSD's lockd, it's been far too long of a wait. New rpcbind(8) replaces portmap(8) (supporting communication over an authenticated Unix-domain socket, and by default only allowing set and unset requests over that channel). It's much more secure than the old portmapper. Umount(8), mountd(8), mount_nfs(8), nfsd(8) have also been upgraded to support TI-RPC and to support IPV6. Umount(8) is also fixed to unmount pathnames longer than 80 chars, which are currently truncated by the Kernel statfs structure. Submitted by: Martin Blapp <mb@imp.ch> Manpage review: ru Secure RPC implemented by: wpaul
2001-03-19 12:50:13 +00:00
#include <signal.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
#include <pthread.h>
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
#include <stdlib.h>
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
#include <errno.h>
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
#include "libc_private.h"
* Add stubs for pthread_cond_broadcast. * Fix typos in rwlock stubs. * Add pthread_XXX counterparts to the _pthread_XXX stubs which libraries like libX11 can use to ensure thread-safety without requiring the use of a thread library. Submitted by: Terry Lambert (pthread_cond_broadcast) Reviewed by: deischen
2002-11-01 09:37:17 +00:00
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
/*
* Weak symbols: All libc internal usage of these functions should
* use the weak symbol versions (_pthread_XXX). If libpthread is
* linked, it will override these functions with (non-weak) routines.
* The _pthread_XXX functions are provided solely for internal libc
* usage to avoid unwanted cancellation points and to differentiate
* between application locks and libc locks (threads holding the
* latter can't be allowed to exit/terminate).
*/
* Add stubs for pthread_cond_broadcast. * Fix typos in rwlock stubs. * Add pthread_XXX counterparts to the _pthread_XXX stubs which libraries like libX11 can use to ensure thread-safety without requiring the use of a thread library. Submitted by: Terry Lambert (pthread_cond_broadcast) Reviewed by: deischen
2002-11-01 09:37:17 +00:00
Bring in a hybrid of SunSoft's transport-independent RPC (TI-RPC) and associated changes that had to happen to make this possible as well as bugs fixed along the way. Bring in required TLI library routines to support this. Since we don't support TLI we've essentially copied what NetBSD has done, adding a thin layer to emulate direct the TLI calls into BSD socket calls. This is mostly from Sun's tirpc release that was made in 1994, however some fixes were backported from the 1999 release (supposedly only made available after this porting effort was underway). The submitter has agreed to continue on and bring us up to the 1999 release. Several key features are introduced with this update: Client calls are thread safe. (1999 code has server side thread safe) Updated, a more modern interface. Many userland updates were done to bring the code up to par with the recent RPC API. There is an update to the pthreads library, a function pthread_main_np() was added to emulate a function of Sun's threads library. While we're at it, bring in NetBSD's lockd, it's been far too long of a wait. New rpcbind(8) replaces portmap(8) (supporting communication over an authenticated Unix-domain socket, and by default only allowing set and unset requests over that channel). It's much more secure than the old portmapper. Umount(8), mountd(8), mount_nfs(8), nfsd(8) have also been upgraded to support TI-RPC and to support IPV6. Umount(8) is also fixed to unmount pathnames longer than 80 chars, which are currently truncated by the Kernel statfs structure. Submitted by: Martin Blapp <mb@imp.ch> Manpage review: ru Secure RPC implemented by: wpaul
2001-03-19 12:50:13 +00:00
/* Define a null pthread structure just to satisfy _pthread_self. */
libc MT-safety, part 2. Add a lock to FILE. flockfile and friends are now implemented (for the most part) in libc. flockfile_debug is implemented in libc_r; I suppose it's about time to kill it but will do it in a future commit. Fix a potential deadlock in _fwalk in a threaded environment. A file flag (__SIGN) was added to stdio.h that, when set, tells _fwalk to ignore it in its walk. This seemed to be needed in refill.c because each file needs to be locked when flushing. Add a stub for pthread_self in libc. This is needed by flockfile which is allowed by POSIX to be recursive. Make fgetpos() error return value (-1) match man page. Remove recursive calls to locked functions (stdio); I think I've got them all, but I may have missed a couple. A few K&R -> ANSI conversions along with removal of a few instances of "register". $Id$ -> $FreeBSD$ in libc/stdio/rget.c Not objected to: -arch, a few months ago
2001-02-11 22:06:43 +00:00
struct pthread {
};
static struct pthread main_thread;
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
static int stub_main(void);
static void *stub_null(void);
static struct pthread *stub_self(void);
static int stub_zero(void);
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
static int stub_fail(void);
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
static int stub_true(void);
static void stub_exit(void);
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
#define PJT_DUAL_ENTRY(entry) \
(pthread_func_t)entry, (pthread_func_t)entry
Argh, change declaration of two-dimensional array so that it actually builds.
2002-11-13 21:55:22 +00:00
pthread_func_entry_t __thr_jtable[PJT_MAX] = {
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATFORK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_DESTROY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETDETACHSTATE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETGUARDSIZE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETINHERITSCHED */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETSCHEDPARAM */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETSCHEDPOLICY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETSCOPE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETSTACKADDR */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_GETSTACKSIZE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_INIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETDETACHSTATE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETGUARDSIZE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETINHERITSCHED */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETSCHEDPARAM */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETSCHEDPOLICY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETSCOPE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETSTACKADDR */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_ATTR_SETSTACKSIZE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CANCEL */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CLEANUP_POP */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CLEANUP_PUSH */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_BROADCAST */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_DESTROY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_INIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_SIGNAL */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_TIMEDWAIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_COND_WAIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_DETACH */
{PJT_DUAL_ENTRY(stub_true)}, /* PJT_EQUAL */
{PJT_DUAL_ENTRY(stub_exit)}, /* PJT_EXIT */
{PJT_DUAL_ENTRY(stub_null)}, /* PJT_GETSPECIFIC */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_JOIN */
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
{PJT_DUAL_ENTRY(stub_fail)}, /* PJT_KEY_CREATE */
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_KEY_DELETE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_KILL */
{PJT_DUAL_ENTRY(stub_main)}, /* PJT_MAIN_NP */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEXATTR_DESTROY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEXATTR_INIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEXATTR_SETTYPE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_DESTROY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_INIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_LOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_TRYLOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_UNLOCK */
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
{PJT_DUAL_ENTRY(stub_fail)}, /* PJT_ONCE */
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_DESTROY */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_INIT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_RDLOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_TRYRDLOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_TRYWRLOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_UNLOCK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_RWLOCK_WRLOCK */
{PJT_DUAL_ENTRY(stub_self)}, /* PJT_SELF */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_SETCANCELSTATE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_SETCANCELTYPE */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_SETSPECIFIC */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_SIGMASK */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_TESTCANCEL */
Use umtx to implement process sharable semaphore, to make this work, now type sema_t is a structure which can be put in a shared memory area, and multiple processes can operate it concurrently. User can either use mmap(MAP_SHARED) + sem_init(pshared=1) or use sem_open() to initialize a shared semaphore. Named semaphore uses file system and is located in /tmp directory, and its file name is prefixed with 'SEMD', so now it is chroot or jail friendly. In simplist cases, both for named and un-named semaphore, userland code does not have to enter kernel to reduce/increase semaphore's count. The semaphore is designed to be crash-safe, it means even if an application is crashed in the middle of operating semaphore, the semaphore state is still safely recovered by later use, there is no waiter counter maintained by userland code. The main semaphore code is in libc and libthr only has some necessary stubs, this makes it possible that a non-threaded application can use semaphore without linking to thread library. Old semaphore implementation is kept libc to maintain binary compatibility. The kernel ksem API is no longer used in the new implemenation. Discussed on: threads@
2010-01-05 02:37:59 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CLEANUP_POP_IMP */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CLEANUP_PUSH_IMP */
To support stack unwinding for cancellation points, add -fexceptions flag for them, two functions _pthread_cancel_enter and _pthread_cancel_leave are added to let thread enter and leave a cancellation point, it also makes it possible that other functions can be cancellation points in libraries without having to be rewritten in libthr.
2010-09-25 01:57:47 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CANCEL_ENTER */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_CANCEL_LEAVE */
Add implementation of robust mutexes, hopefully close enough to the intention of the POSIX IEEE Std 1003.1TM-2008/Cor 1-2013. A robust mutex is guaranteed to be cleared by the system upon either thread or process owner termination while the mutex is held. The next mutex locker is then notified about inconsistent mutex state and can execute (or abandon) corrective actions. The patch mostly consists of small changes here and there, adding neccessary checks for the inconsistent and abandoned conditions into existing paths. Additionally, the thread exit handler was extended to iterate over the userspace-maintained list of owned robust mutexes, unlocking and marking as terminated each of them. The list of owned robust mutexes cannot be maintained atomically synchronous with the mutex lock state (it is possible in kernel, but is too expensive). Instead, for the duration of lock or unlock operation, the current mutex is remembered in a special slot that is also checked by the kernel at thread termination. Kernel must be aware about the per-thread location of the heads of robust mutex lists and the current active mutex slot. When a thread touches a robust mutex for the first time, a new umtx op syscall is issued which informs about location of lists heads. The umtx sleep queues for PP and PI mutexes are split between non-robust and robust. Somewhat unrelated changes in the patch: 1. Style. 2. The fix for proper tdfind() call use in umtxq_sleep_pi() for shared pi mutexes. 3. Removal of the userspace struct pthread_mutex m_owner field. 4. The sysctl kern.ipc.umtx_vnode_persistent is added, which controls the lifetime of the shared mutex associated with a vnode' page. Reviewed by: jilles (previous version, supposedly the objection was fixed) Discussed with: brooks, Martin Simmons <martin@lispworks.com> (some aspects) Tested by: pho Sponsored by: The FreeBSD Foundation
2016-05-17 09:56:22 +00:00
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEX_CONSISTENT */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEXATTR_GETROBUST */
{PJT_DUAL_ENTRY(stub_zero)}, /* PJT_MUTEXATTR_SETROBUST */
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
};
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
/*
* Weak aliases for exported (pthread_*) and internal (_pthread_*) routines.
*/
#define WEAK_REF(sym, alias) __weak_reference(sym, alias)
#define FUNC_TYPE(name) __CONCAT(name, _func_t)
#define FUNC_INT(name) __CONCAT(name, _int)
#define FUNC_EXP(name) __CONCAT(name, _exp)
#define STUB_FUNC(name, idx, ret) \
Fix a stub function so that is has the correct number of arguments. While I'm here, correct a couple of [tab] alignments. Submitted by: bland
2005-11-12 16:00:29 +00:00
static ret FUNC_EXP(name)(void) __used; \
static ret FUNC_INT(name)(void) __used; \
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
WEAK_REF(FUNC_EXP(name), name); \
WEAK_REF(FUNC_INT(name), __CONCAT(_, name)); \
typedef ret (*FUNC_TYPE(name))(void); \
static ret FUNC_EXP(name)(void) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][0]; \
return (func()); \
} \
static ret FUNC_INT(name)(void) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][1]; \
return (func()); \
}
#define STUB_FUNC1(name, idx, ret, p0_type) \
Use newly added __used attribute to keep static function symbols from being eliminated by compiler optimizer.
2004-07-29 18:07:08 +00:00
static ret FUNC_EXP(name)(p0_type) __used; \
static ret FUNC_INT(name)(p0_type) __used; \
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
WEAK_REF(FUNC_EXP(name), name); \
WEAK_REF(FUNC_INT(name), __CONCAT(_, name)); \
typedef ret (*FUNC_TYPE(name))(p0_type); \
static ret FUNC_EXP(name)(p0_type p0) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][0]; \
return (func(p0)); \
} \
static ret FUNC_INT(name)(p0_type p0) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][1]; \
return (func(p0)); \
}
#define STUB_FUNC2(name, idx, ret, p0_type, p1_type) \
Use newly added __used attribute to keep static function symbols from being eliminated by compiler optimizer.
2004-07-29 18:07:08 +00:00
static ret FUNC_EXP(name)(p0_type, p1_type) __used; \
static ret FUNC_INT(name)(p0_type, p1_type) __used; \
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
WEAK_REF(FUNC_EXP(name), name); \
WEAK_REF(FUNC_INT(name), __CONCAT(_, name)); \
typedef ret (*FUNC_TYPE(name))(p0_type, p1_type); \
static ret FUNC_EXP(name)(p0_type p0, p1_type p1) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][0]; \
return (func(p0, p1)); \
} \
static ret FUNC_INT(name)(p0_type p0, p1_type p1) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][1]; \
return (func(p0, p1)); \
}
#define STUB_FUNC3(name, idx, ret, p0_type, p1_type, p2_type) \
Use newly added __used attribute to keep static function symbols from being eliminated by compiler optimizer.
2004-07-29 18:07:08 +00:00
static ret FUNC_EXP(name)(p0_type, p1_type, p2_type) __used; \
static ret FUNC_INT(name)(p0_type, p1_type, p2_type) __used; \
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
WEAK_REF(FUNC_EXP(name), name); \
WEAK_REF(FUNC_INT(name), __CONCAT(_, name)); \
typedef ret (*FUNC_TYPE(name))(p0_type, p1_type, p2_type); \
static ret FUNC_EXP(name)(p0_type p0, p1_type p1, p2_type p2) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][0]; \
return (func(p0, p1, p2)); \
} \
static ret FUNC_INT(name)(p0_type p0, p1_type p1, p2_type p2) \
{ \
FUNC_TYPE(name) func; \
func = (FUNC_TYPE(name))__thr_jtable[idx][1]; \
return (func(p0, p1, p2)); \
}
STUB_FUNC1(pthread_cond_broadcast, PJT_COND_BROADCAST, int, void *)
STUB_FUNC1(pthread_cond_destroy, PJT_COND_DESTROY, int, void *)
STUB_FUNC2(pthread_cond_init, PJT_COND_INIT, int, void *, void *)
STUB_FUNC1(pthread_cond_signal, PJT_COND_SIGNAL, int, void *)
Fix a stub function so that is has the correct number of arguments. While I'm here, correct a couple of [tab] alignments. Submitted by: bland
2005-11-12 16:00:29 +00:00
STUB_FUNC2(pthread_cond_wait, PJT_COND_WAIT, int, void *, void *)
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
STUB_FUNC1(pthread_getspecific, PJT_GETSPECIFIC, void *, pthread_key_t)
STUB_FUNC2(pthread_key_create, PJT_KEY_CREATE, int, void *, void *)
STUB_FUNC1(pthread_key_delete, PJT_KEY_DELETE, int, pthread_key_t)
STUB_FUNC(pthread_main_np, PJT_MAIN_NP, int)
STUB_FUNC1(pthread_mutex_destroy, PJT_MUTEX_DESTROY, int, void *)
STUB_FUNC2(pthread_mutex_init, PJT_MUTEX_INIT, int, void *, void *)
STUB_FUNC1(pthread_mutex_lock, PJT_MUTEX_LOCK, int, void *)
STUB_FUNC1(pthread_mutex_trylock, PJT_MUTEX_TRYLOCK, int, void *)
STUB_FUNC1(pthread_mutex_unlock, PJT_MUTEX_UNLOCK, int, void *)
Add implementation of robust mutexes, hopefully close enough to the intention of the POSIX IEEE Std 1003.1TM-2008/Cor 1-2013. A robust mutex is guaranteed to be cleared by the system upon either thread or process owner termination while the mutex is held. The next mutex locker is then notified about inconsistent mutex state and can execute (or abandon) corrective actions. The patch mostly consists of small changes here and there, adding neccessary checks for the inconsistent and abandoned conditions into existing paths. Additionally, the thread exit handler was extended to iterate over the userspace-maintained list of owned robust mutexes, unlocking and marking as terminated each of them. The list of owned robust mutexes cannot be maintained atomically synchronous with the mutex lock state (it is possible in kernel, but is too expensive). Instead, for the duration of lock or unlock operation, the current mutex is remembered in a special slot that is also checked by the kernel at thread termination. Kernel must be aware about the per-thread location of the heads of robust mutex lists and the current active mutex slot. When a thread touches a robust mutex for the first time, a new umtx op syscall is issued which informs about location of lists heads. The umtx sleep queues for PP and PI mutexes are split between non-robust and robust. Somewhat unrelated changes in the patch: 1. Style. 2. The fix for proper tdfind() call use in umtxq_sleep_pi() for shared pi mutexes. 3. Removal of the userspace struct pthread_mutex m_owner field. 4. The sysctl kern.ipc.umtx_vnode_persistent is added, which controls the lifetime of the shared mutex associated with a vnode' page. Reviewed by: jilles (previous version, supposedly the objection was fixed) Discussed with: brooks, Martin Simmons <martin@lispworks.com> (some aspects) Tested by: pho Sponsored by: The FreeBSD Foundation
2016-05-17 09:56:22 +00:00
STUB_FUNC1(pthread_mutex_consistent, PJT_MUTEX_CONSISTENT, int, void *)
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
STUB_FUNC1(pthread_mutexattr_destroy, PJT_MUTEXATTR_DESTROY, int, void *)
STUB_FUNC1(pthread_mutexattr_init, PJT_MUTEXATTR_INIT, int, void *)
Correct the pthread stub prototype for pthread_mutexattr_settype to allow for the type argument. This is known to fix some pthread_mutexattr_settype() invocations, especially when it comes to pulseaudio. Approved by: kib deischen (threads) MFC after: 3 days
2009-10-01 18:23:50 +00:00
STUB_FUNC2(pthread_mutexattr_settype, PJT_MUTEXATTR_SETTYPE, int, void *, int)
Add implementation of robust mutexes, hopefully close enough to the intention of the POSIX IEEE Std 1003.1TM-2008/Cor 1-2013. A robust mutex is guaranteed to be cleared by the system upon either thread or process owner termination while the mutex is held. The next mutex locker is then notified about inconsistent mutex state and can execute (or abandon) corrective actions. The patch mostly consists of small changes here and there, adding neccessary checks for the inconsistent and abandoned conditions into existing paths. Additionally, the thread exit handler was extended to iterate over the userspace-maintained list of owned robust mutexes, unlocking and marking as terminated each of them. The list of owned robust mutexes cannot be maintained atomically synchronous with the mutex lock state (it is possible in kernel, but is too expensive). Instead, for the duration of lock or unlock operation, the current mutex is remembered in a special slot that is also checked by the kernel at thread termination. Kernel must be aware about the per-thread location of the heads of robust mutex lists and the current active mutex slot. When a thread touches a robust mutex for the first time, a new umtx op syscall is issued which informs about location of lists heads. The umtx sleep queues for PP and PI mutexes are split between non-robust and robust. Somewhat unrelated changes in the patch: 1. Style. 2. The fix for proper tdfind() call use in umtxq_sleep_pi() for shared pi mutexes. 3. Removal of the userspace struct pthread_mutex m_owner field. 4. The sysctl kern.ipc.umtx_vnode_persistent is added, which controls the lifetime of the shared mutex associated with a vnode' page. Reviewed by: jilles (previous version, supposedly the objection was fixed) Discussed with: brooks, Martin Simmons <martin@lispworks.com> (some aspects) Tested by: pho Sponsored by: The FreeBSD Foundation
2016-05-17 09:56:22 +00:00
STUB_FUNC2(pthread_mutexattr_getrobust, PJT_MUTEXATTR_GETROBUST, int, void *,
int *)
STUB_FUNC2(pthread_mutexattr_setrobust, PJT_MUTEXATTR_SETROBUST, int, void *,
int)
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
STUB_FUNC2(pthread_once, PJT_ONCE, int, void *, void *)
STUB_FUNC1(pthread_rwlock_destroy, PJT_RWLOCK_DESTROY, int, void *)
STUB_FUNC2(pthread_rwlock_init, PJT_RWLOCK_INIT, int, void *, void *)
STUB_FUNC1(pthread_rwlock_rdlock, PJT_RWLOCK_RDLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_tryrdlock, PJT_RWLOCK_TRYRDLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_trywrlock, PJT_RWLOCK_TRYWRLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_unlock, PJT_RWLOCK_UNLOCK, int, void *)
STUB_FUNC1(pthread_rwlock_wrlock, PJT_RWLOCK_WRLOCK, int, void *)
STUB_FUNC(pthread_self, PJT_SELF, pthread_t)
STUB_FUNC2(pthread_setspecific, PJT_SETSPECIFIC, int, pthread_key_t, void *)
STUB_FUNC3(pthread_sigmask, PJT_SIGMASK, int, int, void *, void *)
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
STUB_FUNC3(pthread_atfork, PJT_ATFORK, int, void *, void *, void*)
STUB_FUNC1(pthread_attr_destroy, PJT_ATTR_DESTROY, int, void *);
STUB_FUNC2(pthread_attr_getdetachstate, PJT_ATTR_GETDETACHSTATE, int, void *, void *)
STUB_FUNC2(pthread_attr_getguardsize, PJT_ATTR_GETGUARDSIZE, int, void *, void *)
STUB_FUNC2(pthread_attr_getstackaddr, PJT_ATTR_GETSTACKADDR, int, void *, void *)
STUB_FUNC2(pthread_attr_getstacksize, PJT_ATTR_GETSTACKSIZE, int, void *, void *)
STUB_FUNC2(pthread_attr_getinheritsched, PJT_ATTR_GETINHERITSCHED, int, void *, void *)
STUB_FUNC2(pthread_attr_getschedparam, PJT_ATTR_GETSCHEDPARAM, int, void *, void *)
STUB_FUNC2(pthread_attr_getschedpolicy, PJT_ATTR_GETSCHEDPOLICY, int, void *, void *)
STUB_FUNC2(pthread_attr_getscope, PJT_ATTR_GETSCOPE, int, void *, void *)
STUB_FUNC1(pthread_attr_init, PJT_ATTR_INIT, int, void *)
STUB_FUNC2(pthread_attr_setdetachstate, PJT_ATTR_SETDETACHSTATE, int, void *, int)
STUB_FUNC2(pthread_attr_setguardsize, PJT_ATTR_SETGUARDSIZE, int, void *, size_t)
STUB_FUNC2(pthread_attr_setstackaddr, PJT_ATTR_SETSTACKADDR, int, void *, void *)
STUB_FUNC2(pthread_attr_setstacksize, PJT_ATTR_SETSTACKSIZE, int, void *, size_t)
STUB_FUNC2(pthread_attr_setinheritsched, PJT_ATTR_SETINHERITSCHED, int, void *, int)
STUB_FUNC2(pthread_attr_setschedparam, PJT_ATTR_SETSCHEDPARAM, int, void *, void *)
STUB_FUNC2(pthread_attr_setschedpolicy, PJT_ATTR_SETSCHEDPOLICY, int, void *, int)
STUB_FUNC2(pthread_attr_setscope, PJT_ATTR_SETSCOPE, int, void *, int)
STUB_FUNC1(pthread_cancel, PJT_CANCEL, int, void *)
STUB_FUNC1(pthread_cleanup_pop, PJT_CLEANUP_POP, int, int)
STUB_FUNC2(pthread_cleanup_push, PJT_CLEANUP_PUSH, void, void *, void *)
STUB_FUNC3(pthread_cond_timedwait, PJT_COND_TIMEDWAIT, int, void *, void *, void *)
STUB_FUNC1(pthread_detach, PJT_DETACH, int, void *)
STUB_FUNC2(pthread_equal, PJT_EQUAL, int, void *, void *)
STUB_FUNC1(pthread_exit, PJT_EXIT, void, void *)
STUB_FUNC2(pthread_join, PJT_JOIN, int, void *, void *)
STUB_FUNC2(pthread_kill, PJT_KILL, int, void *, int)
STUB_FUNC2(pthread_setcancelstate, PJT_SETCANCELSTATE, int, int, void *)
STUB_FUNC2(pthread_setcanceltype, PJT_SETCANCELTYPE, int, int, void *)
STUB_FUNC(pthread_testcancel, PJT_TESTCANCEL, void)
Use umtx to implement process sharable semaphore, to make this work, now type sema_t is a structure which can be put in a shared memory area, and multiple processes can operate it concurrently. User can either use mmap(MAP_SHARED) + sem_init(pshared=1) or use sem_open() to initialize a shared semaphore. Named semaphore uses file system and is located in /tmp directory, and its file name is prefixed with 'SEMD', so now it is chroot or jail friendly. In simplist cases, both for named and un-named semaphore, userland code does not have to enter kernel to reduce/increase semaphore's count. The semaphore is designed to be crash-safe, it means even if an application is crashed in the middle of operating semaphore, the semaphore state is still safely recovered by later use, there is no waiter counter maintained by userland code. The main semaphore code is in libc and libthr only has some necessary stubs, this makes it possible that a non-threaded application can use semaphore without linking to thread library. Old semaphore implementation is kept libc to maintain binary compatibility. The kernel ksem API is no longer used in the new implemenation. Discussed on: threads@
2010-01-05 02:37:59 +00:00
STUB_FUNC1(__pthread_cleanup_pop_imp, PJT_CLEANUP_POP_IMP, int, int)
STUB_FUNC2(__pthread_cleanup_push_imp, PJT_CLEANUP_PUSH_IMP, void, void*, void *);
To support stack unwinding for cancellation points, add -fexceptions flag for them, two functions _pthread_cancel_enter and _pthread_cancel_leave are added to let thread enter and leave a cancellation point, it also makes it possible that other functions can be cancellation points in libraries without having to be rewritten in libthr.
2010-09-25 01:57:47 +00:00
STUB_FUNC1(_pthread_cancel_enter, PJT_CANCEL_ENTER, int, int)
STUB_FUNC1(_pthread_cancel_leave, PJT_CANCEL_LEAVE, int, int)
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
static int
stub_zero(void)
add a stub for pthread_cond_destroy.
2002-09-19 01:09:49 +00:00
{
return (0);
}
* Add stubs for pthread_cond_broadcast. * Fix typos in rwlock stubs. * Add pthread_XXX counterparts to the _pthread_XXX stubs which libraries like libX11 can use to ensure thread-safety without requiring the use of a thread library. Submitted by: Terry Lambert (pthread_cond_broadcast) Reviewed by: deischen
2002-11-01 09:37:17 +00:00
static void *
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
stub_null(void)
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
{
return (NULL);
}
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
static struct pthread *
stub_self(void)
libc MT-safety, part 2. Add a lock to FILE. flockfile and friends are now implemented (for the most part) in libc. flockfile_debug is implemented in libc_r; I suppose it's about time to kill it but will do it in a future commit. Fix a potential deadlock in _fwalk in a threaded environment. A file flag (__SIGN) was added to stdio.h that, when set, tells _fwalk to ignore it in its walk. This seemed to be needed in refill.c because each file needs to be locked when flushing. Add a stub for pthread_self in libc. This is needed by flockfile which is allowed by POSIX to be recursive. Make fgetpos() error return value (-1) match man page. Remove recursive calls to locked functions (stdio); I think I've got them all, but I may have missed a couple. A few K&R -> ANSI conversions along with removal of a few instances of "register". $Id$ -> $FreeBSD$ in libc/stdio/rget.c Not objected to: -arch, a few months ago
2001-02-11 22:06:43 +00:00
{
return (&main_thread);
}
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
static int
stub_fail(void)
{
style(9) fix. Approved by: dim (mentor)
2011-11-26 16:49:25 +00:00
return (ENOSYS);
Return not-implemented from pthread_once and pthread_key_create, rather than silently failing and returning success. Without this, code calls pthread_once(), receives a return value of success, and thinks that the passed function has been called. Approved by: dim (mentor)
2011-11-26 15:57:09 +00:00
}
* Add stubs for pthread_cond_broadcast. * Fix typos in rwlock stubs. * Add pthread_XXX counterparts to the _pthread_XXX stubs which libraries like libX11 can use to ensure thread-safety without requiring the use of a thread library. Submitted by: Terry Lambert (pthread_cond_broadcast) Reviewed by: deischen
2002-11-01 09:37:17 +00:00
static int
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
stub_main(void)
Remove _THREAD_SAFE and make libc thread-safe by default by adding (weak definitions to) stubs for some of the pthread functions. If the threads library is linked in, the real pthread functions will pulled in. Use the following convention for system calls wrapped by the threads library: __sys_foo - actual system call _foo - weak definition to __sys_foo foo - weak definition to __sys_foo Change all libc uses of system calls wrapped by the threads library from foo to _foo. In order to define the prototypes for _foo(), we introduce namespace.h and un-namespace.h (suggested by bde). All files that need to reference these system calls, should include namespace.h before any standard includes, then include un-namespace.h after the standard includes and before any local includes. <db.h> is an exception and shouldn't be included in between namespace.h and un-namespace.h namespace.h will define foo to _foo, and un-namespace.h will undefine foo. Try to eliminate some of the recursive calls to MT-safe functions in libc/stdio in preparation for adding a mutex to FILE. We have recursive mutexes, but would like to avoid using them if possible. Remove uneeded includes of <errno.h> from a few files. Add $FreeBSD$ to a few files in order to pass commitprep. Approved by: -arch
2001-01-24 13:01:12 +00:00
{
Use a jump table (a la Solaris) for pthread routines with default entries in the table being stubs. While I'm here, add macros to auto-generate the stubs. A conforming threads library can override the stub routines by filling in the jump table. Add some entries to namespace.h and sync un-namespace.h to it. Also add a comment to remind folks to update un-namespace.h when changing namespace.h.
2002-11-13 18:12:09 +00:00
return (-1);
* Add stubs for pthread_cond_broadcast. * Fix typos in rwlock stubs. * Add pthread_XXX counterparts to the _pthread_XXX stubs which libraries like libX11 can use to ensure thread-safety without requiring the use of a thread library. Submitted by: Terry Lambert (pthread_cond_broadcast) Reviewed by: deischen
2002-11-01 09:37:17 +00:00
}
Add some more pthread stubs so that librt can use them. The thread jump table has been resorted, so you need to keep libc, libpthread, and libthr in sync. Submitted by: xu
2006-03-05 18:10:28 +00:00
static int
stub_true(void)
{
return (1);
}
static void
stub_exit(void)
{
exit(0);
}
Reference in New Issue Copy Permalink