02292f131a
o The polling mechanism for I/O readiness was changed from
select() to poll(). In additon, a wrapped version of poll()
is now provided.
o The wrapped select routine now converts each fd_set to a
poll array so that the thread scheduler doesn't have to
perform a bitwise search for selected fds each time file
descriptors are polled for I/O readiness.
o The thread scheduler was modified to use a new queue (_workq)
for threads that need work. Threads waiting for I/O readiness
and spinblocks are added to the work queue in addition to the
waiting queue. This reduces the time spent forming/searching
the array of file descriptors being polled.
o The waiting queue (_waitingq) is now maintained in order of
thread wakeup time. This allows the thread scheduler to
find the nearest wakeup time by looking at the first thread
in the queue instead of searching the entire queue.
o Removed file descriptor locking for select/poll routines. An
application should not rely on the threads library for providing
this locking; if necessary, the application should use mutexes
to protect selecting/polling of file descriptors.
o Retrieve and use the kernel clock rate/resolution at startup
instead of hardcoding the clock resolution to 10 msec (tested
with kernel running at 1000 HZ).
o All queues have been changed to use queue.h macros. These
include the queues of all threads, dead threads, and threads
waiting for file descriptor locks.
o Added reinitialization of the GC mutex and condition variable
after a fork. Also prevented reallocation of the ready queue
after a fork.
o Prevented the wrapped close routine from closing the thread
kernel pipes.
o Initialized file descriptor table for stdio entries at thread
init.
o Provided additional flags to indicate to what queues threads
belong.
o Moved TAILQ initialization for statically allocated mutex and
condition variables to after the spinlock.
o Added dispatching of signals to pthread_kill. Removing the
dispatching of signals from thread activation broke sigsuspend
when pthread_kill was used to send a signal to a thread.
o Temporarily set the state of a thread to PS_SUSPENDED when it
is first created and placed in the list of threads so that it
will not be accidentally scheduled before becoming a member
of one of the scheduling queues.
o Change the signal handler to queue signals to the thread kernel
pipe if the scheduling queues are protected. When scheduling
queues are unprotected, signals are then dequeued and handled.
o Ensured that all installed signal handlers block the scheduling
signal and that the scheduling signal handler blocks all
other signals. This ensures that the signal handler is only
interruptible for and by non-scheduling signals. An atomic
lock is used to decide which instance of the signal handler
will handle pending signals.
o Removed _lock_thread_list and _unlock_thread_list as they are
no longer used to protect the thread list.
o Added missing RCS IDs to modified files.
o Added checks for appropriate queue membership and activity when
adding, removing, and searching the scheduling queues. These
checks add very little overhead and are enabled when compiled
with _PTHREADS_INVARIANTS defined. Suggested and implemented
by Tor Egge with some modification by me.
o Close a race condition in uthread_close. (Tor Egge)
o Protect the scheduling queues while modifying them in
pthread_cond_signal and _thread_fd_unlock. (Tor Egge)
o Ensure that when a thread gets a mutex, the mutex is on that
threads list of owned mutexes. (Tor Egge)
o Set the kernel-in-scheduler flag in _thread_kern_sched_state
and _thread_kern_sched_state_unlock to prevent a scheduling
signal from calling the scheduler again. (Tor Egge)
o Don't use TAILQ_FOREACH macro while searching the waiting
queue for threads in a sigwait state, because a change of
state destroys the TAILQ link. It is actually safe to do
so, though, because once a sigwaiting thread is found, the
loop ends and the function returns. (Tor Egge)
o When dispatching signals to threads, make the thread inherit
the signal deferral flag of the currently running thread.
(Tor Egge)
Submitted by: Daniel Eischen <eischen@vigrid.com> and
Tor Egge <Tor.Egge@fast.no>
1123 lines
31 KiB
C
1123 lines
31 KiB
C
/*
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* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
|
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
|
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* must display the following acknowledgement:
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* This product includes software developed by John Birrell.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Private thread definitions for the uthread kernel.
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*
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* $Id$
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*/
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#ifndef _PTHREAD_PRIVATE_H
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#define _PTHREAD_PRIVATE_H
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/*
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* Evaluate the storage class specifier.
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*/
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#ifdef GLOBAL_PTHREAD_PRIVATE
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#define SCLASS
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#else
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#define SCLASS extern
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#endif
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/*
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* Include files.
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*/
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/queue.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sched.h>
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#include <spinlock.h>
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#include <pthread_np.h>
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|
|
/*
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* Kernel fatal error handler macro.
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|
*/
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#define PANIC(string) _thread_exit(__FILE__,__LINE__,string)
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|
|
|
/* Output debug messages like this: */
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|
#define stdout_debug(_x) _thread_sys_write(1,_x,strlen(_x));
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#define stderr_debug(_x) _thread_sys_write(2,_x,strlen(_x));
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|
|
|
|
|
/*
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* Priority queue manipulation macros (using pqe link):
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|
*/
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|
#define PTHREAD_PRIOQ_INSERT_HEAD(thrd) _pq_insert_head(&_readyq,thrd)
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#define PTHREAD_PRIOQ_INSERT_TAIL(thrd) _pq_insert_tail(&_readyq,thrd)
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#define PTHREAD_PRIOQ_REMOVE(thrd) _pq_remove(&_readyq,thrd)
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#define PTHREAD_PRIOQ_FIRST() _pq_first(&_readyq)
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|
|
|
/*
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|
* Waiting queue manipulation macros (using pqe link):
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|
*/
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|
#if defined(_PTHREADS_INVARIANTS)
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|
#define PTHREAD_WAITQ_REMOVE(thrd) _waitq_remove(thrd)
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|
#define PTHREAD_WAITQ_INSERT(thrd) _waitq_insert(thrd)
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#define PTHREAD_WAITQ_CLEARACTIVE() _waitq_clearactive()
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#define PTHREAD_WAITQ_SETACTIVE() _waitq_setactive()
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#else
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#define PTHREAD_WAITQ_REMOVE(thrd) TAILQ_REMOVE(&_waitingq,thrd,pqe)
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#define PTHREAD_WAITQ_INSERT(thrd) do { \
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if ((thrd)->wakeup_time.tv_sec == -1) \
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TAILQ_INSERT_TAIL(&_waitingq,thrd,pqe); \
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else { \
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pthread_t tid = TAILQ_FIRST(&_waitingq); \
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|
while ((tid != NULL) && (tid->wakeup_time.tv_sec != -1) && \
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((tid->wakeup_time.tv_sec < (thrd)->wakeup_time.tv_sec) || \
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((tid->wakeup_time.tv_sec == (thrd)->wakeup_time.tv_sec) && \
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(tid->wakeup_time.tv_nsec <= (thrd)->wakeup_time.tv_nsec)))) \
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tid = TAILQ_NEXT(tid, pqe); \
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if (tid == NULL) \
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TAILQ_INSERT_TAIL(&_waitingq,thrd,pqe); \
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else \
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TAILQ_INSERT_BEFORE(tid,thrd,pqe); \
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} \
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} while (0)
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#define PTHREAD_WAITQ_CLEARACTIVE()
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#define PTHREAD_WAITQ_SETACTIVE()
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#endif
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|
|
|
/*
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* Work queue manipulation macros (using qe link):
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|
*/
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#define PTHREAD_WORKQ_INSERT(thrd) do { \
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TAILQ_INSERT_TAIL(&_workq,thrd,qe); \
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(thrd)->flags |= PTHREAD_FLAGS_IN_WORKQ; \
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|
} while (0)
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#define PTHREAD_WORKQ_REMOVE(thrd) do { \
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TAILQ_REMOVE(&_workq,thrd,qe); \
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(thrd)->flags &= ~PTHREAD_FLAGS_IN_WORKQ; \
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|
} while (0)
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|
|
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/*
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* State change macro without scheduling queue change:
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|
*/
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#define PTHREAD_SET_STATE(thrd, newstate) do { \
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(thrd)->state = newstate; \
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(thrd)->fname = __FILE__; \
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(thrd)->lineno = __LINE__; \
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} while (0)
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|
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/*
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* State change macro with scheduling queue change - This must be
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* called with preemption deferred (see thread_kern_sched_[un]defer).
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*/
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#if defined(_PTHREADS_INVARIANTS)
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#define PTHREAD_NEW_STATE(thrd, newstate) do { \
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if (_thread_kern_new_state != 0) \
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PANIC("Recursive PTHREAD_NEW_STATE"); \
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_thread_kern_new_state = 1; \
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if ((thrd)->state != newstate) { \
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if ((thrd)->state == PS_RUNNING) { \
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PTHREAD_PRIOQ_REMOVE(thrd); \
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PTHREAD_WAITQ_INSERT(thrd); \
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} else if (newstate == PS_RUNNING) { \
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PTHREAD_WAITQ_REMOVE(thrd); \
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PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
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} \
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} \
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_thread_kern_new_state = 0; \
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PTHREAD_SET_STATE(thrd, newstate); \
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} while (0)
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#else
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#define PTHREAD_NEW_STATE(thrd, newstate) do { \
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if ((thrd)->state != newstate) { \
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if ((thrd)->state == PS_RUNNING) { \
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PTHREAD_PRIOQ_REMOVE(thrd); \
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PTHREAD_WAITQ_INSERT(thrd); \
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} else if (newstate == PS_RUNNING) { \
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PTHREAD_WAITQ_REMOVE(thrd); \
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PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
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} \
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} \
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PTHREAD_SET_STATE(thrd, newstate); \
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} while (0)
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#endif
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/*
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* Define the signals to be used for scheduling.
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*/
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#if defined(_PTHREADS_COMPAT_SCHED)
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#define _ITIMER_SCHED_TIMER ITIMER_VIRTUAL
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#define _SCHED_SIGNAL SIGVTALRM
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#else
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#define _ITIMER_SCHED_TIMER ITIMER_PROF
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#define _SCHED_SIGNAL SIGPROF
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#endif
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/*
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* Priority queues.
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*
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* XXX It'd be nice if these were contained in uthread_priority_queue.[ch].
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*/
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typedef struct pq_list {
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TAILQ_HEAD(, pthread) pl_head; /* list of threads at this priority */
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TAILQ_ENTRY(pq_list) pl_link; /* link for queue of priority lists */
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int pl_prio; /* the priority of this list */
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int pl_queued; /* is this in the priority queue */
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} pq_list_t;
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typedef struct pq_queue {
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TAILQ_HEAD(, pq_list) pq_queue; /* queue of priority lists */
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pq_list_t *pq_lists; /* array of all priority lists */
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int pq_size; /* number of priority lists */
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} pq_queue_t;
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|
|
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/*
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* TailQ initialization values.
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|
*/
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#define TAILQ_INITIALIZER { NULL, NULL }
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|
|
/*
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|
* Mutex definitions.
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|
*/
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|
union pthread_mutex_data {
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void *m_ptr;
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int m_count;
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};
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struct pthread_mutex {
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enum pthread_mutextype m_type;
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int m_protocol;
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TAILQ_HEAD(mutex_head, pthread) m_queue;
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struct pthread *m_owner;
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union pthread_mutex_data m_data;
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long m_flags;
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int m_refcount;
|
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|
|
/*
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|
* Used for priority inheritence and protection.
|
|
*
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* m_prio - For priority inheritence, the highest active
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* priority (threads locking the mutex inherit
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|
* this priority). For priority protection, the
|
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* ceiling priority of this mutex.
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* m_saved_prio - mutex owners inherited priority before
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* taking the mutex, restored when the owner
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* unlocks the mutex.
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*/
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|
int m_prio;
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int m_saved_prio;
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|
|
/*
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|
* Link for list of all mutexes a thread currently owns.
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*/
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|
TAILQ_ENTRY(pthread_mutex) m_qe;
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|
|
/*
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|
* Lock for accesses to this structure.
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|
*/
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|
spinlock_t lock;
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};
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|
|
/*
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|
* Flags for mutexes.
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|
*/
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|
#define MUTEX_FLAGS_PRIVATE 0x01
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#define MUTEX_FLAGS_INITED 0x02
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#define MUTEX_FLAGS_BUSY 0x04
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|
|
/*
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|
* Static mutex initialization values.
|
|
*/
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|
#define PTHREAD_MUTEX_STATIC_INITIALIZER \
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{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, TAILQ_INITIALIZER, \
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NULL, { NULL }, 0, 0, 0, 0, TAILQ_INITIALIZER, \
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_SPINLOCK_INITIALIZER }
|
|
|
|
struct pthread_mutex_attr {
|
|
enum pthread_mutextype m_type;
|
|
int m_protocol;
|
|
int m_ceiling;
|
|
long m_flags;
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|
};
|
|
|
|
/*
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|
* Condition variable definitions.
|
|
*/
|
|
enum pthread_cond_type {
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|
COND_TYPE_FAST,
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COND_TYPE_MAX
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|
};
|
|
|
|
struct pthread_cond {
|
|
enum pthread_cond_type c_type;
|
|
TAILQ_HEAD(cond_head, pthread) c_queue;
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|
pthread_mutex_t c_mutex;
|
|
void *c_data;
|
|
long c_flags;
|
|
|
|
/*
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|
* Lock for accesses to this structure.
|
|
*/
|
|
spinlock_t lock;
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|
};
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|
|
struct pthread_cond_attr {
|
|
enum pthread_cond_type c_type;
|
|
long c_flags;
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|
};
|
|
|
|
/*
|
|
* Flags for condition variables.
|
|
*/
|
|
#define COND_FLAGS_PRIVATE 0x01
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|
#define COND_FLAGS_INITED 0x02
|
|
#define COND_FLAGS_BUSY 0x04
|
|
|
|
/*
|
|
* Static cond initialization values.
|
|
*/
|
|
#define PTHREAD_COND_STATIC_INITIALIZER \
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{ COND_TYPE_FAST, TAILQ_INITIALIZER, NULL, NULL, \
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0, _SPINLOCK_INITIALIZER }
|
|
|
|
/*
|
|
* Cleanup definitions.
|
|
*/
|
|
struct pthread_cleanup {
|
|
struct pthread_cleanup *next;
|
|
void (*routine) ();
|
|
void *routine_arg;
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|
};
|
|
|
|
struct pthread_attr {
|
|
int sched_policy;
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|
int sched_inherit;
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|
int sched_interval;
|
|
int prio;
|
|
int suspend;
|
|
int flags;
|
|
void *arg_attr;
|
|
void (*cleanup_attr) ();
|
|
void *stackaddr_attr;
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|
size_t stacksize_attr;
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|
};
|
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|
|
/*
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|
* Thread creation state attributes.
|
|
*/
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|
#define PTHREAD_CREATE_RUNNING 0
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#define PTHREAD_CREATE_SUSPENDED 1
|
|
|
|
/*
|
|
* Miscellaneous definitions.
|
|
*/
|
|
#define PTHREAD_STACK_DEFAULT 65536
|
|
#define PTHREAD_DEFAULT_PRIORITY 64
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|
#define PTHREAD_MAX_PRIORITY 126
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|
#define PTHREAD_MIN_PRIORITY 0
|
|
#define _POSIX_THREAD_ATTR_STACKSIZE
|
|
|
|
/*
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|
* Clock resolution in nanoseconds.
|
|
*/
|
|
#define CLOCK_RES_NSEC 10000000
|
|
|
|
/*
|
|
* Time slice period in microseconds.
|
|
*/
|
|
#define TIMESLICE_USEC 100000
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|
|
|
struct pthread_key {
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|
spinlock_t lock;
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|
volatile int allocated;
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|
volatile int count;
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|
void (*destructor) ();
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|
};
|
|
|
|
struct pthread_rwlockattr {
|
|
int pshared;
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|
};
|
|
|
|
struct pthread_rwlock {
|
|
pthread_mutex_t lock; /* monitor lock */
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|
int state; /* 0 = idle >0 = # of readers -1 = writer */
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|
pthread_cond_t read_signal;
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|
pthread_cond_t write_signal;
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|
int blocked_writers;
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|
};
|
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|
|
/*
|
|
* Thread states.
|
|
*/
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|
enum pthread_state {
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PS_RUNNING,
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PS_SIGTHREAD,
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PS_MUTEX_WAIT,
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|
PS_COND_WAIT,
|
|
PS_FDLR_WAIT,
|
|
PS_FDLW_WAIT,
|
|
PS_FDR_WAIT,
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PS_FDW_WAIT,
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|
PS_FILE_WAIT,
|
|
PS_POLL_WAIT,
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|
PS_SELECT_WAIT,
|
|
PS_SLEEP_WAIT,
|
|
PS_WAIT_WAIT,
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|
PS_SIGSUSPEND,
|
|
PS_SIGWAIT,
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|
PS_SPINBLOCK,
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|
PS_JOIN,
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|
PS_SUSPENDED,
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|
PS_DEAD,
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|
PS_DEADLOCK,
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|
PS_STATE_MAX
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|
};
|
|
|
|
|
|
/*
|
|
* File descriptor locking definitions.
|
|
*/
|
|
#define FD_READ 0x1
|
|
#define FD_WRITE 0x2
|
|
#define FD_RDWR (FD_READ | FD_WRITE)
|
|
|
|
/*
|
|
* File descriptor table structure.
|
|
*/
|
|
struct fd_table_entry {
|
|
/*
|
|
* Lock for accesses to this file descriptor table
|
|
* entry. This is passed to _spinlock() to provide atomic
|
|
* access to this structure. It does *not* represent the
|
|
* state of the lock on the file descriptor.
|
|
*/
|
|
spinlock_t lock;
|
|
TAILQ_HEAD(, pthread) r_queue; /* Read queue. */
|
|
TAILQ_HEAD(, pthread) w_queue; /* Write queue. */
|
|
struct pthread *r_owner; /* Ptr to thread owning read lock. */
|
|
struct pthread *w_owner; /* Ptr to thread owning write lock. */
|
|
char *r_fname; /* Ptr to read lock source file name */
|
|
int r_lineno; /* Read lock source line number. */
|
|
char *w_fname; /* Ptr to write lock source file name */
|
|
int w_lineno; /* Write lock source line number. */
|
|
int r_lockcount; /* Count for FILE read locks. */
|
|
int w_lockcount; /* Count for FILE write locks. */
|
|
int flags; /* Flags used in open. */
|
|
};
|
|
|
|
struct pthread_poll_data {
|
|
int nfds;
|
|
struct pollfd *fds;
|
|
};
|
|
|
|
union pthread_wait_data {
|
|
pthread_mutex_t mutex;
|
|
pthread_cond_t cond;
|
|
const sigset_t *sigwait; /* Waiting on a signal in sigwait */
|
|
struct {
|
|
short fd; /* Used when thread waiting on fd */
|
|
short branch; /* Line number, for debugging. */
|
|
char *fname; /* Source file name for debugging.*/
|
|
} fd;
|
|
struct pthread_poll_data * poll_data;
|
|
spinlock_t *spinlock;
|
|
};
|
|
|
|
/*
|
|
* Thread structure.
|
|
*/
|
|
struct pthread {
|
|
/*
|
|
* Magic value to help recognize a valid thread structure
|
|
* from an invalid one:
|
|
*/
|
|
#define PTHREAD_MAGIC ((u_int32_t) 0xd09ba115)
|
|
u_int32_t magic;
|
|
char *name;
|
|
|
|
/*
|
|
* Lock for accesses to this thread structure.
|
|
*/
|
|
spinlock_t lock;
|
|
|
|
/* Queue entry for list of all threads: */
|
|
TAILQ_ENTRY(pthread) tle;
|
|
|
|
/* Queue entry for list of dead threads: */
|
|
TAILQ_ENTRY(pthread) dle;
|
|
|
|
/*
|
|
* Thread start routine, argument, stack pointer and thread
|
|
* attributes.
|
|
*/
|
|
void *(*start_routine)(void *);
|
|
void *arg;
|
|
void *stack;
|
|
struct pthread_attr attr;
|
|
|
|
#if (defined(__FreeBSD__) || defined(__NetBSD__)) && defined(__i386__)
|
|
/*
|
|
* Saved floating point registers on systems where they are not
|
|
* saved in the signal context.
|
|
*/
|
|
char saved_fp[108];
|
|
#endif
|
|
|
|
/*
|
|
* Saved signal context used in call to sigreturn by
|
|
* _thread_kern_sched if sig_saved is TRUE.
|
|
*/
|
|
struct sigcontext saved_sigcontext;
|
|
|
|
/*
|
|
* Saved jump buffer used in call to longjmp by _thread_kern_sched
|
|
* if sig_saved is FALSE.
|
|
*/
|
|
jmp_buf saved_jmp_buf;
|
|
|
|
/*
|
|
* TRUE if the last state saved was a signal context. FALSE if the
|
|
* last state saved was a jump buffer.
|
|
*/
|
|
int sig_saved;
|
|
|
|
/*
|
|
* Current signal mask and pending signals.
|
|
*/
|
|
sigset_t sigmask;
|
|
sigset_t sigpend;
|
|
|
|
/* Thread state: */
|
|
enum pthread_state state;
|
|
|
|
/* Time that this thread was last made active. */
|
|
struct timeval last_active;
|
|
|
|
/* Time that this thread was last made inactive. */
|
|
struct timeval last_inactive;
|
|
|
|
/*
|
|
* Number of microseconds accumulated by this thread when
|
|
* time slicing is active.
|
|
*/
|
|
long slice_usec;
|
|
|
|
/*
|
|
* Incremental priority accumulated by thread while it is ready to
|
|
* run but is denied being run.
|
|
*/
|
|
int inc_prio;
|
|
|
|
/*
|
|
* Time to wake up thread. This is used for sleeping threads and
|
|
* for any operation which may time out (such as select).
|
|
*/
|
|
struct timespec wakeup_time;
|
|
|
|
/* TRUE if operation has timed out. */
|
|
int timeout;
|
|
|
|
/*
|
|
* Error variable used instead of errno. The function __error()
|
|
* returns a pointer to this.
|
|
*/
|
|
int error;
|
|
|
|
/* Join queue head and link for waiting threads: */
|
|
TAILQ_HEAD(join_head, pthread) join_queue;
|
|
|
|
/*
|
|
* The current thread can belong to only one scheduling queue at
|
|
* a time (ready or waiting queue). It can also belong to (only)
|
|
* one of:
|
|
*
|
|
* o A queue of threads waiting for a mutex
|
|
* o A queue of threads waiting for a condition variable
|
|
* o A queue of threads waiting for another thread to terminate
|
|
* (the join queue above)
|
|
* o A queue of threads waiting for a file descriptor lock
|
|
* o A queue of threads needing work done by the kernel thread
|
|
* (waiting for a spinlock or file I/O)
|
|
*
|
|
* Use pqe for the scheduling queue link (both ready and waiting),
|
|
* and qe for other links.
|
|
*/
|
|
|
|
/* Priority queue entry for this thread: */
|
|
TAILQ_ENTRY(pthread) pqe;
|
|
|
|
/* Queue entry for this thread: */
|
|
TAILQ_ENTRY(pthread) qe;
|
|
|
|
/* Wait data. */
|
|
union pthread_wait_data data;
|
|
|
|
/*
|
|
* Allocated for converting select into poll.
|
|
*/
|
|
struct pthread_poll_data poll_data;
|
|
|
|
/*
|
|
* Set to TRUE if a blocking operation was
|
|
* interrupted by a signal:
|
|
*/
|
|
int interrupted;
|
|
|
|
/* Signal number when in state PS_SIGWAIT: */
|
|
int signo;
|
|
|
|
/*
|
|
* Set to non-zero when this thread has deferred signals.
|
|
* We allow for recursive deferral.
|
|
*/
|
|
int sig_defer_count;
|
|
|
|
/*
|
|
* Set to TRUE if this thread should yield after undeferring
|
|
* signals.
|
|
*/
|
|
int yield_on_sig_undefer;
|
|
|
|
/* Miscellaneous data. */
|
|
int flags;
|
|
#define PTHREAD_FLAGS_PRIVATE 0x0001
|
|
#define PTHREAD_EXITING 0x0002
|
|
#define PTHREAD_FLAGS_IN_CONDQ 0x0004 /* in condition queue using qe link*/
|
|
#define PTHREAD_FLAGS_IN_WORKQ 0x0008 /* in work queue using qe link */
|
|
#define PTHREAD_FLAGS_IN_WAITQ 0x0010 /* in waiting queue using pqe link*/
|
|
#define PTHREAD_FLAGS_IN_PRIOQ 0x0020 /* in priority queue using pqe link*/
|
|
#define PTHREAD_FLAGS_TRACE 0x0040 /* for debugging purposes */
|
|
|
|
/*
|
|
* Base priority is the user setable and retrievable priority
|
|
* of the thread. It is only affected by explicit calls to
|
|
* set thread priority and upon thread creation via a thread
|
|
* attribute or default priority.
|
|
*/
|
|
char base_priority;
|
|
|
|
/*
|
|
* Inherited priority is the priority a thread inherits by
|
|
* taking a priority inheritence or protection mutex. It
|
|
* is not affected by base priority changes. Inherited
|
|
* priority defaults to and remains 0 until a mutex is taken
|
|
* that is being waited on by any other thread whose priority
|
|
* is non-zero.
|
|
*/
|
|
char inherited_priority;
|
|
|
|
/*
|
|
* Active priority is always the maximum of the threads base
|
|
* priority and inherited priority. When there is a change
|
|
* in either the base or inherited priority, the active
|
|
* priority must be recalculated.
|
|
*/
|
|
char active_priority;
|
|
|
|
/* Number of priority ceiling or protection mutexes owned. */
|
|
int priority_mutex_count;
|
|
|
|
/*
|
|
* Queue of currently owned mutexes.
|
|
*/
|
|
TAILQ_HEAD(, pthread_mutex) mutexq;
|
|
|
|
void *ret;
|
|
const void **specific_data;
|
|
int specific_data_count;
|
|
|
|
/* Cleanup handlers Link List */
|
|
struct pthread_cleanup *cleanup;
|
|
char *fname; /* Ptr to source file name */
|
|
int lineno; /* Source line number. */
|
|
};
|
|
|
|
/*
|
|
* Global variables for the uthread kernel.
|
|
*/
|
|
|
|
/* Kernel thread structure used when there are no running threads: */
|
|
SCLASS struct pthread _thread_kern_thread;
|
|
|
|
/* Ptr to the thread structure for the running thread: */
|
|
SCLASS struct pthread * volatile _thread_run
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= &_thread_kern_thread;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Ptr to the thread structure for the last user thread to run: */
|
|
SCLASS struct pthread * volatile _last_user_thread
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= &_thread_kern_thread;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Ptr to the thread running in single-threaded mode or NULL if
|
|
* running multi-threaded (default POSIX behaviour).
|
|
*/
|
|
SCLASS struct pthread * volatile _thread_single
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* List of all threads: */
|
|
SCLASS TAILQ_HEAD(, pthread) _thread_list
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= TAILQ_HEAD_INITIALIZER(_thread_list);
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Array of kernel pipe file descriptors that are used to ensure that
|
|
* no signals are missed in calls to _select.
|
|
*/
|
|
SCLASS int _thread_kern_pipe[2]
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= {
|
|
-1,
|
|
-1
|
|
};
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int volatile _queue_signals
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0;
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int _thread_kern_in_sched
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Last time that an incremental priority update was performed: */
|
|
SCLASS struct timeval kern_inc_prio_time
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { 0, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Dead threads: */
|
|
SCLASS TAILQ_HEAD(, pthread) _dead_list
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= TAILQ_HEAD_INITIALIZER(_dead_list);
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Initial thread: */
|
|
SCLASS struct pthread *_thread_initial
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default thread attributes: */
|
|
SCLASS struct pthread_attr pthread_attr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { SCHED_RR, 0, TIMESLICE_USEC, PTHREAD_DEFAULT_PRIORITY, PTHREAD_CREATE_RUNNING,
|
|
PTHREAD_CREATE_JOINABLE, NULL, NULL, NULL, PTHREAD_STACK_DEFAULT };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default mutex attributes: */
|
|
SCLASS struct pthread_mutex_attr pthread_mutexattr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Default condition variable attributes: */
|
|
SCLASS struct pthread_cond_attr pthread_condattr_default
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= { COND_TYPE_FAST, 0 };
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/*
|
|
* Standard I/O file descriptors need special flag treatment since
|
|
* setting one to non-blocking does all on *BSD. Sigh. This array
|
|
* is used to store the initial flag settings.
|
|
*/
|
|
SCLASS int _pthread_stdio_flags[3];
|
|
|
|
/* File table information: */
|
|
SCLASS struct fd_table_entry **_thread_fd_table
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Table for polling file descriptors: */
|
|
SCLASS struct pollfd *_thread_pfd_table
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
SCLASS const int dtablecount
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 4096/sizeof(struct fd_table_entry);
|
|
#else
|
|
;
|
|
#endif
|
|
SCLASS int _thread_dtablesize /* Descriptor table size. */
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 1024;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
SCLASS int _clock_res_nsec /* Clock resolution in nsec. */
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= CLOCK_RES_NSEC;
|
|
#else
|
|
;
|
|
#endif
|
|
|
|
/* Garbage collector mutex and condition variable. */
|
|
SCLASS pthread_mutex_t _gc_mutex
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
SCLASS pthread_cond_t _gc_cond
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
|
|
/*
|
|
* Array of signal actions for this process.
|
|
*/
|
|
struct sigaction _thread_sigact[NSIG];
|
|
|
|
/*
|
|
* Scheduling queues:
|
|
*/
|
|
SCLASS pq_queue_t _readyq;
|
|
SCLASS TAILQ_HEAD(, pthread) _waitingq;
|
|
|
|
/*
|
|
* Work queue:
|
|
*/
|
|
SCLASS TAILQ_HEAD(, pthread) _workq;
|
|
|
|
/* Tracks the number of threads blocked while waiting for a spinlock. */
|
|
SCLASS volatile int _spinblock_count
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
/* Indicates that the signal queue needs to be checked. */
|
|
SCLASS volatile int _sigq_check_reqd
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
/* Thread switch hook. */
|
|
SCLASS pthread_switch_routine_t _sched_switch_hook
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= NULL
|
|
#endif
|
|
;
|
|
|
|
/* Used for _PTHREADS_INVARIANTS checking. */
|
|
SCLASS int _thread_kern_new_state
|
|
#ifdef GLOBAL_PTHREAD_PRIVATE
|
|
= 0
|
|
#endif
|
|
;
|
|
|
|
|
|
/* Undefine the storage class specifier: */
|
|
#undef SCLASS
|
|
|
|
#ifdef _LOCK_DEBUG
|
|
#define _FD_LOCK(_fd,_type,_ts) _thread_fd_lock_debug(_fd, _type, \
|
|
_ts, __FILE__, __LINE__)
|
|
#define _FD_UNLOCK(_fd,_type) _thread_fd_unlock_debug(_fd, _type, \
|
|
__FILE__, __LINE__)
|
|
#else
|
|
#define _FD_LOCK(_fd,_type,_ts) _thread_fd_lock(_fd, _type, _ts)
|
|
#define _FD_UNLOCK(_fd,_type) _thread_fd_unlock(_fd, _type)
|
|
#endif
|
|
|
|
/*
|
|
* Function prototype definitions.
|
|
*/
|
|
__BEGIN_DECLS
|
|
char *__ttyname_basic(int);
|
|
char *__ttyname_r_basic(int, char *, size_t);
|
|
char *ttyname_r(int, char *, size_t);
|
|
int _find_dead_thread(pthread_t);
|
|
int _find_thread(pthread_t);
|
|
int _thread_create(pthread_t *,const pthread_attr_t *,void *(*start_routine)(void *),void *,pthread_t);
|
|
int _thread_fd_lock(int, int, struct timespec *);
|
|
int _thread_fd_lock_debug(int, int, struct timespec *,char *fname,int lineno);
|
|
void _dispatch_signals(void);
|
|
void _thread_signal(pthread_t, int);
|
|
int _mutex_cv_lock(pthread_mutex_t *);
|
|
int _mutex_cv_unlock(pthread_mutex_t *);
|
|
int _mutex_reinit(pthread_mutex_t *);
|
|
void _mutex_notify_priochange(struct pthread *);
|
|
int _cond_reinit(pthread_cond_t *);
|
|
int _pq_alloc(struct pq_queue *, int, int);
|
|
int _pq_init(struct pq_queue *);
|
|
void _pq_remove(struct pq_queue *pq, struct pthread *);
|
|
void _pq_insert_head(struct pq_queue *pq, struct pthread *);
|
|
void _pq_insert_tail(struct pq_queue *pq, struct pthread *);
|
|
struct pthread *_pq_first(struct pq_queue *pq);
|
|
#if defined(_PTHREADS_INVARIANTS)
|
|
void _waitq_insert(pthread_t pthread);
|
|
void _waitq_remove(pthread_t pthread);
|
|
void _waitq_setactive(void);
|
|
void _waitq_clearactive(void);
|
|
#endif
|
|
void _thread_exit(char *, int, char *);
|
|
void _thread_fd_unlock(int, int);
|
|
void _thread_fd_unlock_debug(int, int, char *, int);
|
|
void *_thread_cleanup(pthread_t);
|
|
void _thread_cleanupspecific(void);
|
|
void _thread_dump_info(void);
|
|
void _thread_init(void);
|
|
void _thread_kern_sched(struct sigcontext *);
|
|
void _thread_kern_sched_state(enum pthread_state,char *fname,int lineno);
|
|
void _thread_kern_sched_state_unlock(enum pthread_state state,
|
|
spinlock_t *lock, char *fname, int lineno);
|
|
void _thread_kern_set_timeout(struct timespec *);
|
|
void _thread_kern_sig_defer(void);
|
|
void _thread_kern_sig_undefer(void);
|
|
void _thread_sig_handler(int, int, struct sigcontext *);
|
|
void _thread_sig_handle(int, struct sigcontext *);
|
|
void _thread_sig_init(void);
|
|
void _thread_start(void);
|
|
void _thread_start_sig_handler(void);
|
|
void _thread_seterrno(pthread_t,int);
|
|
int _thread_fd_table_init(int fd);
|
|
pthread_addr_t _thread_gc(pthread_addr_t);
|
|
|
|
/* #include <signal.h> */
|
|
int _thread_sys_sigaction(int, const struct sigaction *, struct sigaction *);
|
|
int _thread_sys_sigpending(sigset_t *);
|
|
int _thread_sys_sigprocmask(int, const sigset_t *, sigset_t *);
|
|
int _thread_sys_sigsuspend(const sigset_t *);
|
|
int _thread_sys_siginterrupt(int, int);
|
|
int _thread_sys_sigpause(int);
|
|
int _thread_sys_sigreturn(struct sigcontext *);
|
|
int _thread_sys_sigstack(const struct sigstack *, struct sigstack *);
|
|
int _thread_sys_sigvec(int, struct sigvec *, struct sigvec *);
|
|
void _thread_sys_psignal(unsigned int, const char *);
|
|
void (*_thread_sys_signal(int, void (*)(int)))(int);
|
|
|
|
/* #include <sys/stat.h> */
|
|
#ifdef _SYS_STAT_H_
|
|
int _thread_sys_fchmod(int, mode_t);
|
|
int _thread_sys_fstat(int, struct stat *);
|
|
int _thread_sys_fchflags(int, u_long);
|
|
#endif
|
|
|
|
/* #include <sys/mount.h> */
|
|
#ifdef _SYS_MOUNT_H_
|
|
int _thread_sys_fstatfs(int, struct statfs *);
|
|
#endif
|
|
int _thread_sys_pipe(int *);
|
|
|
|
/* #include <sys/socket.h> */
|
|
#ifdef _SYS_SOCKET_H_
|
|
int _thread_sys_accept(int, struct sockaddr *, int *);
|
|
int _thread_sys_bind(int, const struct sockaddr *, int);
|
|
int _thread_sys_connect(int, const struct sockaddr *, int);
|
|
int _thread_sys_getpeername(int, struct sockaddr *, int *);
|
|
int _thread_sys_getsockname(int, struct sockaddr *, int *);
|
|
int _thread_sys_getsockopt(int, int, int, void *, int *);
|
|
int _thread_sys_listen(int, int);
|
|
int _thread_sys_setsockopt(int, int, int, const void *, int);
|
|
int _thread_sys_shutdown(int, int);
|
|
int _thread_sys_socket(int, int, int);
|
|
int _thread_sys_socketpair(int, int, int, int *);
|
|
ssize_t _thread_sys_recv(int, void *, size_t, int);
|
|
ssize_t _thread_sys_recvfrom(int, void *, size_t, int, struct sockaddr *, int *);
|
|
ssize_t _thread_sys_recvmsg(int, struct msghdr *, int);
|
|
ssize_t _thread_sys_send(int, const void *, size_t, int);
|
|
ssize_t _thread_sys_sendmsg(int, const struct msghdr *, int);
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ssize_t _thread_sys_sendto(int, const void *,size_t, int, const struct sockaddr *, int);
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#endif
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|
|
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/* #include <stdio.h> */
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#ifdef _STDIO_H_
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FILE *_thread_sys_fdopen(int, const char *);
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FILE *_thread_sys_fopen(const char *, const char *);
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FILE *_thread_sys_freopen(const char *, const char *, FILE *);
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FILE *_thread_sys_popen(const char *, const char *);
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|
FILE *_thread_sys_tmpfile(void);
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char *_thread_sys_ctermid(char *);
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|
char *_thread_sys_cuserid(char *);
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|
char *_thread_sys_fgetln(FILE *, size_t *);
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|
char *_thread_sys_fgets(char *, int, FILE *);
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|
char *_thread_sys_gets(char *);
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char *_thread_sys_tempnam(const char *, const char *);
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|
char *_thread_sys_tmpnam(char *);
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int _thread_sys_fclose(FILE *);
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int _thread_sys_feof(FILE *);
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int _thread_sys_ferror(FILE *);
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int _thread_sys_fflush(FILE *);
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int _thread_sys_fgetc(FILE *);
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int _thread_sys_fgetpos(FILE *, fpos_t *);
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|
int _thread_sys_fileno(FILE *);
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|
int _thread_sys_fprintf(FILE *, const char *, ...);
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|
int _thread_sys_fpurge(FILE *);
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|
int _thread_sys_fputc(int, FILE *);
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|
int _thread_sys_fputs(const char *, FILE *);
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|
int _thread_sys_fscanf(FILE *, const char *, ...);
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|
int _thread_sys_fseek(FILE *, long, int);
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|
int _thread_sys_fsetpos(FILE *, const fpos_t *);
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|
int _thread_sys_getc(FILE *);
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|
int _thread_sys_getchar(void);
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|
int _thread_sys_getw(FILE *);
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|
int _thread_sys_pclose(FILE *);
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|
int _thread_sys_printf(const char *, ...);
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|
int _thread_sys_putc(int, FILE *);
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|
int _thread_sys_putchar(int);
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|
int _thread_sys_puts(const char *);
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|
int _thread_sys_putw(int, FILE *);
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|
int _thread_sys_remove(const char *);
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|
int _thread_sys_rename (const char *, const char *);
|
|
int _thread_sys_scanf(const char *, ...);
|
|
int _thread_sys_setlinebuf(FILE *);
|
|
int _thread_sys_setvbuf(FILE *, char *, int, size_t);
|
|
int _thread_sys_snprintf(char *, size_t, const char *, ...);
|
|
int _thread_sys_sprintf(char *, const char *, ...);
|
|
int _thread_sys_sscanf(const char *, const char *, ...);
|
|
int _thread_sys_ungetc(int, FILE *);
|
|
int _thread_sys_vfprintf(FILE *, const char *, _BSD_VA_LIST_);
|
|
int _thread_sys_vprintf(const char *, _BSD_VA_LIST_);
|
|
int _thread_sys_vscanf(const char *, _BSD_VA_LIST_);
|
|
int _thread_sys_vsnprintf(char *, size_t, const char *, _BSD_VA_LIST_);
|
|
int _thread_sys_vsprintf(char *, const char *, _BSD_VA_LIST_);
|
|
int _thread_sys_vsscanf(const char *, const char *, _BSD_VA_LIST_);
|
|
long _thread_sys_ftell(FILE *);
|
|
size_t _thread_sys_fread(void *, size_t, size_t, FILE *);
|
|
size_t _thread_sys_fwrite(const void *, size_t, size_t, FILE *);
|
|
void _thread_sys_clearerr(FILE *);
|
|
void _thread_sys_perror(const char *);
|
|
void _thread_sys_rewind(FILE *);
|
|
void _thread_sys_setbuf(FILE *, char *);
|
|
void _thread_sys_setbuffer(FILE *, char *, int);
|
|
#endif
|
|
|
|
/* #include <unistd.h> */
|
|
#ifdef _UNISTD_H_
|
|
char *_thread_sys_ttyname(int);
|
|
int _thread_sys_close(int);
|
|
int _thread_sys_dup(int);
|
|
int _thread_sys_dup2(int, int);
|
|
int _thread_sys_exect(const char *, char * const *, char * const *);
|
|
int _thread_sys_execve(const char *, char * const *, char * const *);
|
|
int _thread_sys_fchdir(int);
|
|
int _thread_sys_fchown(int, uid_t, gid_t);
|
|
int _thread_sys_fsync(int);
|
|
int _thread_sys_ftruncate(int, off_t);
|
|
int _thread_sys_pause(void);
|
|
int _thread_sys_pipe(int *);
|
|
int _thread_sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
|
|
off_t _thread_sys_lseek(int, off_t, int);
|
|
pid_t _thread_sys_fork(void);
|
|
pid_t _thread_sys_tcgetpgrp(int);
|
|
ssize_t _thread_sys_read(int, void *, size_t);
|
|
ssize_t _thread_sys_write(int, const void *, size_t);
|
|
void _thread_sys__exit(int);
|
|
#endif
|
|
|
|
/* #include <fcntl.h> */
|
|
#ifdef _SYS_FCNTL_H_
|
|
int _thread_sys_creat(const char *, mode_t);
|
|
int _thread_sys_fcntl(int, int, ...);
|
|
int _thread_sys_flock(int, int);
|
|
int _thread_sys_open(const char *, int, ...);
|
|
#endif
|
|
|
|
/* #include <sys/ioctl.h> */
|
|
#ifdef _SYS_IOCTL_H_
|
|
int _thread_sys_ioctl(int, unsigned long, ...);
|
|
#endif
|
|
|
|
/* #include <dirent.h> */
|
|
#ifdef _DIRENT_H_
|
|
DIR *___thread_sys_opendir2(const char *, int);
|
|
DIR *_thread_sys_opendir(const char *);
|
|
int _thread_sys_alphasort(const void *, const void *);
|
|
int _thread_sys_scandir(const char *, struct dirent ***,
|
|
int (*)(struct dirent *), int (*)(const void *, const void *));
|
|
int _thread_sys_closedir(DIR *);
|
|
int _thread_sys_getdirentries(int, char *, int, long *);
|
|
long _thread_sys_telldir(const DIR *);
|
|
struct dirent *_thread_sys_readdir(DIR *);
|
|
void _thread_sys_rewinddir(DIR *);
|
|
void _thread_sys_seekdir(DIR *, long);
|
|
#endif
|
|
|
|
/* #include <sys/uio.h> */
|
|
#ifdef _SYS_UIO_H_
|
|
ssize_t _thread_sys_readv(int, const struct iovec *, int);
|
|
ssize_t _thread_sys_writev(int, const struct iovec *, int);
|
|
#endif
|
|
|
|
/* #include <sys/wait.h> */
|
|
#ifdef WNOHANG
|
|
pid_t _thread_sys_wait(int *);
|
|
pid_t _thread_sys_waitpid(pid_t, int *, int);
|
|
pid_t _thread_sys_wait3(int *, int, struct rusage *);
|
|
pid_t _thread_sys_wait4(pid_t, int *, int, struct rusage *);
|
|
#endif
|
|
|
|
/* #include <poll.h> */
|
|
#ifdef _SYS_POLL_H_
|
|
int _thread_sys_poll(struct pollfd *, unsigned, int);
|
|
#endif
|
|
__END_DECLS
|
|
|
|
#endif /* !_PTHREAD_PRIVATE_H */
|