0e67554241
any threads are created turned out to be not such a good idea. there are stronger requirements on what has to work in a forked child while a process is still single-threaded. so take all that stuff back out and fix the problems with single-threaded programs that are linked with libpthread differently, by checking if the library has been started and doing completely different stuff if it hasn't been: - for pthread_rwlock_timedrdlock(), just fail with EDEADLK immediately. - for sem_wait(), the only thing that can unlock the semaphore is a signal handler, so use sigsuspend() to wait for a signal. - for pthread_mutex_lock_slow(), just go into an infinite loop waiting for signals. I also noticed that there's a "sem2" test that has never worked in its single-threaded form. the problem there is that a signal handler tries to take a sem_t interlock which is already held when the signal is received. fix this too, by adding a single-threaded case for sig_trywait() that blocks signals instead of using the userland interlock.
378 lines
12 KiB
C
378 lines
12 KiB
C
/* $NetBSD: pthread_int.h,v 1.33 2005/10/19 02:15:03 chs Exp $ */
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/*-
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* Copyright (c) 2001,2002,2003 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nathan J. Williams.
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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 the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LIB_PTHREAD_INT_H
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#define _LIB_PTHREAD_INT_H
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#define PTHREAD__DEBUG
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#define ERRORCHECK
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#include "pthread_types.h"
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#include "pthread_queue.h"
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#include "pthread_debug.h"
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#include "pthread_md.h"
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#include <sa.h>
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#include <signal.h>
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#define PTHREAD_KEYS_MAX 256
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/*
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* The size of this structure needs to be no larger than struct
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* __pthread_cleanup_store, defined in pthread.h.
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*/
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struct pt_clean_t {
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PTQ_ENTRY(pt_clean_t) ptc_next;
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void (*ptc_cleanup)(void *);
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void *ptc_arg;
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};
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struct pt_alarm_t {
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PTQ_ENTRY(pt_alarm_t) pta_next;
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pthread_spin_t pta_lock;
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const struct timespec *pta_time;
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void (*pta_func)(void *);
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void *pta_arg;
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int pta_fired;
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};
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/* Private data for pthread_attr_t */
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struct pthread_attr_private {
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char ptap_name[PTHREAD_MAX_NAMELEN_NP];
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void *ptap_namearg;
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void *ptap_stackaddr;
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size_t ptap_stacksize;
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size_t ptap_guardsize;
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};
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struct __pthread_st {
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unsigned int pt_magic;
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/* Identifier, for debugging and for preventing recycling. */
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int pt_num;
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int pt_type; /* normal, upcall, or idle */
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int pt_state; /* running, blocked, etc. */
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pthread_spin_t pt_statelock; /* lock on pt_state */
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int pt_flags; /* see PT_FLAG_* below */
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pthread_spin_t pt_flaglock; /* lock on pt_flag */
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int pt_cancel; /* Deferred cancellation */
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int pt_spinlocks; /* Number of spinlocks held. */
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int pt_blockedlwp; /* LWP/SA number when blocked */
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int pt_vpid; /* VP number */
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int pt_blockgen; /* SA_UPCALL_BLOCKED counter */
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int pt_unblockgen; /* SA_UPCALL_UNBLOCKED counter */
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int pt_errno; /* Thread-specific errno. */
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/* Entry on the run queue */
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PTQ_ENTRY(__pthread_st) pt_runq;
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/* Entry on the list of all threads */
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PTQ_ENTRY(__pthread_st) pt_allq;
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/* Entry on the sleep queue (xxx should be same as run queue?) */
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PTQ_ENTRY(__pthread_st) pt_sleep;
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/* Object we're sleeping on */
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void *pt_sleepobj;
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/* Queue we're sleeping on */
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struct pthread_queue_t *pt_sleepq;
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/* Lock protecting that queue */
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pthread_spin_t *pt_sleeplock;
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stack_t pt_stack; /* Our stack */
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ucontext_t *pt_uc; /* Saved context when we're stopped */
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ucontext_t *pt_trapuc; /* Kernel-saved context */
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ucontext_t *__pt_blockuc; /* Kernel-saved context when blocked */
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sigset_t pt_sigmask; /* Signals we won't take. */
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sigset_t pt_siglist; /* Signals pending for us. */
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sigset_t pt_sigblocked; /* Signals delivered while blocked. */
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sigset_t *pt_sigwait; /* Signals waited for in sigwait */
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siginfo_t *pt_wsig;
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pthread_spin_t pt_siglock; /* Lock on above */
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void * pt_exitval; /* Read by pthread_join() */
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/* Stack of cancellation cleanup handlers and their arguments */
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PTQ_HEAD(, pt_clean_t) pt_cleanup_stack;
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/* Thread's name, set by the application. */
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char* pt_name;
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/* Other threads trying to pthread_join() us. */
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struct pthread_queue_t pt_joiners;
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/* Lock for above, and for changing pt_state to ZOMBIE or DEAD,
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* and for setting the DETACHED flag. Also protects pt_name.
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*/
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pthread_spin_t pt_join_lock;
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/* Thread we were going to switch to before we were preempted
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* ourselves. Will be used by the upcall that's continuing us.
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*/
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pthread_t pt_switchto;
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ucontext_t* pt_switchtouc;
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/* Threads that are preempted with spinlocks held will be
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* continued until they unlock their spinlock. When they do
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* so, they should jump ship to the thread pointed to by
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* pt_next.
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*/
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pthread_t pt_next;
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/* The upcall that is continuing this thread */
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pthread_t pt_parent;
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/* A queue lock that this thread held while trying to
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* context switch to another process.
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*/
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pthread_spin_t* pt_heldlock;
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/* Upcall stack information shared between kernel and
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* userland.
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*/
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struct sa_stackinfo_t pt_stackinfo;
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/* Thread-specific data */
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void* pt_specific[PTHREAD_KEYS_MAX];
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#ifdef PTHREAD__DEBUG
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int blocks;
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int preempts;
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int rescheds;
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#endif
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};
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struct pthread_lock_ops {
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void (*plo_init)(__cpu_simple_lock_t *);
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int (*plo_try)(__cpu_simple_lock_t *);
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void (*plo_unlock)(__cpu_simple_lock_t *);
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};
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/* Thread types */
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#define PT_THREAD_NORMAL 1
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#define PT_THREAD_UPCALL 2
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#define PT_THREAD_IDLE 3
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/* Thread states */
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#define PT_STATE_RUNNING 1
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#define PT_STATE_RUNNABLE 2
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#define _PT_STATE_BLOCKED_SYS 3 /* Only used in libpthread_dbg */
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#define PT_STATE_BLOCKED_QUEUE 4
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#define PT_STATE_ZOMBIE 5
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#define PT_STATE_DEAD 6
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#define PT_STATE_SUSPENDED 7
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/* Flag values */
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#define PT_FLAG_DETACHED 0x0001
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#define PT_FLAG_IDLED 0x0002
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#define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */
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#define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */
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#define PT_FLAG_CS_PENDING 0x0010
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#define PT_FLAG_SIGDEFERRED 0x0020 /* There are signals to take */
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#define PT_FLAG_SCOPE_SYSTEM 0x0040
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#define PT_FLAG_EXPLICIT_SCHED 0x0080
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#define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */
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#define PT_FLAG_SIGNALED 0x0200
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#define PT_MAGIC 0x11110001
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#define PT_DEAD 0xDEAD0001
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#define PT_ATTR_MAGIC 0x22220002
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#define PT_ATTR_DEAD 0xDEAD0002
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#ifdef PT_FIXEDSTACKSIZE_LG
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#define PT_STACKSIZE_LG PT_FIXEDSTACKSIZE_LG
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#define PT_STACKSIZE (1<<(PT_STACKSIZE_LG))
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#define PT_STACKMASK (PT_STACKSIZE-1)
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#else /* PT_FIXEDSTACKSIZE_LG */
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extern int pthread_stacksize_lg;
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extern size_t pthread_stacksize;
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extern vaddr_t pthread_stackmask;
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#define PT_STACKSIZE_LG pthread_stacksize_lg
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#define PT_STACKSIZE pthread_stacksize
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#define PT_STACKMASK pthread_stackmask
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#endif /* PT_FIXEDSTACKSIZE_LG */
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#define PT_UPCALLSTACKS 16
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#define PT_ALARMTIMER_MAGIC 0x88880010
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#define PT_RRTIMER_MAGIC 0x88880020
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#define NIDLETHREADS 4
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#define IDLESPINS 1000
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/* Flag to be used in a ucontext_t's uc_flags indicating that
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* the saved register state is "user" state only, not full
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* trap state.
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*/
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#define _UC_USER_BIT 30
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#define _UC_USER (1LU << _UC_USER_BIT)
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void pthread_init(void) __attribute__ ((__constructor__));
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/* Utility functions */
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/* Set up/clean up a thread's basic state. */
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void pthread__initthread(pthread_t self, pthread_t t);
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/* Get offset from stack start to struct sa_stackinfo */
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ssize_t pthread__stackinfo_offset(void);
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/* Go do something else. Don't go back on the run queue */
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void pthread__block(pthread_t self, pthread_spin_t* queuelock);
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/* Put a thread back on the suspended queue */
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void pthread__suspend(pthread_t self, pthread_t thread);
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/* Put a thread back on the run queue */
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void pthread__sched(pthread_t self, pthread_t thread);
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void pthread__sched_sleepers(pthread_t self, struct pthread_queue_t *threadq);
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void pthread__sched_idle(pthread_t self, pthread_t thread);
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void pthread__sched_idle2(pthread_t self);
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void pthread__sched_bulk(pthread_t self, pthread_t qhead);
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void pthread__idle(void);
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/* Get the next thread */
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pthread_t pthread__next(pthread_t self);
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int pthread__stackalloc(pthread_t *t);
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void pthread__initmain(pthread_t *t);
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void pthread__sa_start(void);
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void pthread__sa_recycle(pthread_t old, pthread_t new);
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void pthread__setconcurrency(int);
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/* Alarm code */
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void pthread__alarm_init(void);
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void pthread__alarm_add(pthread_t, struct pt_alarm_t *,
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const struct timespec *, void (*)(void *), void *);
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void pthread__alarm_del(pthread_t, struct pt_alarm_t *);
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int pthread__alarm_fired(struct pt_alarm_t *);
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void pthread__alarm_process(pthread_t self, void *arg);
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/* Internal locking primitives */
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void pthread__lockprim_init(int ncpu);
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void pthread_lockinit(pthread_spin_t *lock);
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void pthread_spinlock(pthread_t thread, pthread_spin_t *lock);
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int pthread_spintrylock(pthread_t thread, pthread_spin_t *lock);
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void pthread_spinunlock(pthread_t thread, pthread_spin_t *lock);
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extern const struct pthread_lock_ops *pthread__lock_ops;
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#define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp)
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#define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp)
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#define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp)
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#ifndef _getcontext_u
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int _getcontext_u(ucontext_t *);
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#endif
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#ifndef _setcontext_u
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int _setcontext_u(const ucontext_t *);
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#endif
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#ifndef _swapcontext_u
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int _swapcontext_u(ucontext_t *, const ucontext_t *);
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#endif
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void pthread__testcancel(pthread_t self);
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int pthread__find(pthread_t self, pthread_t target);
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#ifndef PTHREAD_MD_INIT
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#define PTHREAD_MD_INIT
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#endif
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#ifndef _INITCONTEXT_U_MD
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#define _INITCONTEXT_U_MD(ucp)
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#endif
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#define _INITCONTEXT_U(ucp) do { \
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(ucp)->uc_flags = _UC_CPU | _UC_STACK; \
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_INITCONTEXT_U_MD(ucp) \
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} while (/*CONSTCOND*/0)
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#ifdef PTHREAD_MACHINE_HAS_ID_REGISTER
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#define pthread__id(reg) (reg)
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#else
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/* Stack location of pointer to a particular thread */
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#define pthread__id(sp) \
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((pthread_t) (((vaddr_t)(sp)) & ~PT_STACKMASK))
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#define pthread__id_reg() pthread__sp()
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#endif
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#define pthread__self() (pthread__id(pthread__id_reg()))
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#define pthread__abort() \
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pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable")
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#define pthread__assert(e) do { \
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if (__predict_false(!(e))) \
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pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \
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} while (/*CONSTCOND*/0)
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#define pthread__error(err, msg, e) do { \
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if (__predict_false(!(e))) { \
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pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \
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return (err); \
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} \
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} while (/*CONSTCOND*/0)
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/* These three routines are defined in processor-specific code. */
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void pthread__upcall_switch(pthread_t self, pthread_t next);
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void pthread__switch(pthread_t self, pthread_t next);
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void pthread__locked_switch(pthread_t self, pthread_t next,
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pthread_spin_t *lock);
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void pthread__signal_init(void);
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void pthread__signal_start(void);
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void pthread__signal(pthread_t self, pthread_t t, siginfo_t *si);
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void pthread__deliver_signal(pthread_t self, pthread_t t, siginfo_t *si);
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void pthread__signal_deferred(pthread_t self, pthread_t t);
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void pthread__destroy_tsd(pthread_t self);
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void pthread__assertfunc(const char *file, int line, const char *function,
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const char *expr);
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void pthread__errorfunc(const char *file, int line, const char *function,
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const char *msg);
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#endif /* _LIB_PTHREAD_INT_H */
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