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freebsd-dev/lib/libpthread/support/thr_support.c

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Attempt to eliminate PLT relocations from rwlock aquire/release path, making them suitable for direct use by the dynamic loader. Register libpthread-specific locking API with rtld on startup. This still has some rough edges with signals which should be addresses later. Approved by: re (scottl)
2003-05-30 00:21:52 +00:00
/*-
* Copyright 2003 Alexander Kabaev.
* 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 THE AUTHOR ``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 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/kse.h>
#include <signal.h>
#include <string.h>
Provide a reference to __sys_write. The implementation uses this when debugging is enabled so the symbol needs to be resolved before rtld locking is enabled. I may not really know what I'm talking about, but it works. Submitted by: kan
2003-06-08 17:29:32 +00:00
#include "thr_private.h"
Attempt to eliminate PLT relocations from rwlock aquire/release path, making them suitable for direct use by the dynamic loader. Register libpthread-specific locking API with rtld on startup. This still has some rough edges with signals which should be addresses later. Approved by: re (scottl)
2003-05-30 00:21:52 +00:00
__strong_reference(clock_gettime, _thr_clock_gettime);
__strong_reference(kse_exit, _thr_kse_exit);
__strong_reference(kse_wakeup, _thr_kse_wakeup);
__strong_reference(kse_create, _thr_kse_create);
__strong_reference(kse_thr_interrupt, _thr_kse_thr_interrupt);
__strong_reference(kse_release, _thr_kse_release);
Eliminate plt relocation for kse_switchin.
2005-03-21 23:10:35 +00:00
__strong_reference(kse_switchin, _thr_kse_switchin);
Attempt to eliminate PLT relocations from rwlock aquire/release path, making them suitable for direct use by the dynamic loader. Register libpthread-specific locking API with rtld on startup. This still has some rough edges with signals which should be addresses later. Approved by: re (scottl)
2003-05-30 00:21:52 +00:00
__strong_reference(sigaction, _thr_sigaction);
__strong_reference(sigprocmask, _thr_sigprocmask);
__strong_reference(sigemptyset, _thr_sigemptyset);
__strong_reference(sigaddset, _thr_sigaddset);
__strong_reference(sigfillset, _thr_sigfillset);
__strong_reference(sigismember, _thr_sigismember);
__strong_reference(sigdelset, _thr_sigdelset);
__strong_reference(memset, _thr_memset);
__strong_reference(memcpy, _thr_memcpy);
__strong_reference(strcpy, _thr_strcpy);
__strong_reference(strlen, _thr_strlen);
__strong_reference(bzero, _thr_bzero);
o Use a daemon thread to monitor signal events in kernel, if pending signals were changed in kernel, it will retrieve the pending set and try to find a thread to dispatch the signal. The dispatching process can be rolled back if the signal is no longer in kernel. o Create two functions _thr_signal_init() and _thr_signal_deinit(), all signal action settings are retrieved from kernel when threading mode is turned on, after a fork(), child process will reset them to user settings by calling _thr_signal_deinit(). when threading mode is not turned on, all signal operations are direct past to kernel. o When a thread generated a synchoronous signals and its context returned from completed list, UTS will retrieve the signal from its mailbox and try to deliver the signal to thread. o Context signal mask is now only used when delivering signals, thread's current signal mask is always the one in pthread structure. o Remove have_signals field in pthread structure, replace it with psf_valid in pthread_signal_frame. when psf_valid is true, in context switch time, thread will backout itself from some mutex/condition internal queues, then begin to process signals. when a thread is not at blocked state and running, check_pending indicates there are signals for the thread, after preempted and then resumed time, UTS will try to deliver signals to the thread. o At signal delivering time, not only pending signals in thread will be scanned, process's pending signals will be scanned too. o Change sigwait code a bit, remove field sigwait in pthread_wait_data, replace it with oldsigmask in pthread structure, when a thread calls sigwait(), its current signal mask is backuped to oldsigmask, and waitset is copied to its signal mask and when the thread gets a signal in the waitset range, its current signal mask is restored from oldsigmask, these are done in atomic fashion. o Two additional POSIX APIs are implemented, sigwaitinfo() and sigtimedwait(). o Signal code locking is better than previous, there is fewer race conditions. o Temporary disable most of code in _kse_single_thread as it is not safe after fork().
2003-06-28 09:55:02 +00:00
__strong_reference(bcopy, _thr_bcopy);
Attempt to eliminate PLT relocations from rwlock aquire/release path, making them suitable for direct use by the dynamic loader. Register libpthread-specific locking API with rtld on startup. This still has some rough edges with signals which should be addresses later. Approved by: re (scottl)
2003-05-30 00:21:52 +00:00
Provide a reference to __sys_write. The implementation uses this when debugging is enabled so the symbol needs to be resolved before rtld locking is enabled. I may not really know what I'm talking about, but it works. Submitted by: kan
2003-06-08 17:29:32 +00:00
__strong_reference(__sys_write, _thr__sys_write);
o Use a daemon thread to monitor signal events in kernel, if pending signals were changed in kernel, it will retrieve the pending set and try to find a thread to dispatch the signal. The dispatching process can be rolled back if the signal is no longer in kernel. o Create two functions _thr_signal_init() and _thr_signal_deinit(), all signal action settings are retrieved from kernel when threading mode is turned on, after a fork(), child process will reset them to user settings by calling _thr_signal_deinit(). when threading mode is not turned on, all signal operations are direct past to kernel. o When a thread generated a synchoronous signals and its context returned from completed list, UTS will retrieve the signal from its mailbox and try to deliver the signal to thread. o Context signal mask is now only used when delivering signals, thread's current signal mask is always the one in pthread structure. o Remove have_signals field in pthread structure, replace it with psf_valid in pthread_signal_frame. when psf_valid is true, in context switch time, thread will backout itself from some mutex/condition internal queues, then begin to process signals. when a thread is not at blocked state and running, check_pending indicates there are signals for the thread, after preempted and then resumed time, UTS will try to deliver signals to the thread. o At signal delivering time, not only pending signals in thread will be scanned, process's pending signals will be scanned too. o Change sigwait code a bit, remove field sigwait in pthread_wait_data, replace it with oldsigmask in pthread structure, when a thread calls sigwait(), its current signal mask is backuped to oldsigmask, and waitset is copied to its signal mask and when the thread gets a signal in the waitset range, its current signal mask is restored from oldsigmask, these are done in atomic fashion. o Two additional POSIX APIs are implemented, sigwaitinfo() and sigtimedwait(). o Signal code locking is better than previous, there is fewer race conditions. o Temporary disable most of code in _kse_single_thread as it is not safe after fork().
2003-06-28 09:55:02 +00:00
__strong_reference(__sys_sigtimedwait, _thr__sys_sigtimedwait);
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