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freebsd/lib/libkse/thread/thr_private.h
Daniel Eischen f8a19b12fb s/_thread_sys_write/__sys_write/ 
Submitted by:	Mike Heffner <mheffner@vt.edu>
2001-01-31 02:16:57 +00:00

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/*
* Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>.
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by John Birrell.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Private thread definitions for the uthread kernel.
*
* $FreeBSD$
*/
#ifndef _PTHREAD_PRIVATE_H
#define _PTHREAD_PRIVATE_H
/*
* Evaluate the storage class specifier.
*/
#ifdef GLOBAL_PTHREAD_PRIVATE
#define SCLASS
#else
#define SCLASS extern
#endif
/*
* Include files.
*/
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/cdefs.h>
#include <sched.h>
#include <spinlock.h>
#include <pthread_np.h>
/*
* Define machine dependent macros to get and set the stack pointer
* from the supported contexts. Also define a macro to set the return
* address in a jmp_buf context.
*
* XXX - These need to be moved into architecture dependent support files.
*/
#if defined(__i386__)
#define GET_STACK_JB(jb) ((unsigned long)((jb)[0]._jb[2]))
#define GET_STACK_SJB(sjb) ((unsigned long)((sjb)[0]._sjb[2]))
#define GET_STACK_UC(ucp) ((unsigned long)((ucp)->uc_mcontext.mc_esp))
#define SET_STACK_JB(jb, stk) (jb)[0]._jb[2] = (int)(stk)
#define SET_STACK_SJB(sjb, stk) (sjb)[0]._sjb[2] = (int)(stk)
#define SET_STACK_UC(ucp, stk) (ucp)->uc_mcontext.mc_esp = (int)(stk)
#define FP_SAVE_UC(ucp) do { \
char *fdata; \
fdata = (char *) (ucp)->uc_mcontext.mc_fpregs; \
__asm__("fnsave %0": :"m"(*fdata)); \
} while (0)
#define FP_RESTORE_UC(ucp) do { \
char *fdata; \
fdata = (char *) (ucp)->uc_mcontext.mc_fpregs; \
__asm__("frstor %0": :"m"(*fdata)); \
} while (0)
#define SET_RETURN_ADDR_JB(jb, ra) (jb)[0]._jb[0] = (int)(ra)
#elif defined(__alpha__)
#include <machine/reg.h>
#define GET_STACK_JB(jb) ((unsigned long)((jb)[0]._jb[R_SP + 4]))
#define GET_STACK_SJB(sjb) ((unsigned long)((sjb)[0]._sjb[R_SP + 4]))
#define GET_STACK_UC(ucp) ((ucp)->uc_mcontext.mc_regs[R_SP])
#define SET_STACK_JB(jb, stk) (jb)[0]._jb[R_SP + 4] = (long)(stk)
#define SET_STACK_SJB(sjb, stk) (sjb)[0]._sjb[R_SP + 4] = (long)(stk)
#define SET_STACK_UC(ucp, stk) (ucp)->uc_mcontext.mc_regs[R_SP] = (unsigned long)(stk)
#define FP_SAVE_UC(ucp)
#define FP_RESTORE_UC(ucp)
#define SET_RETURN_ADDR_JB(jb, ra) do { \
(jb)[0]._jb[2] = (unsigned long)(ra) + 8UL; \
(jb)[0]._jb[R_RA + 4] = 0; \
(jb)[0]._jb[R_T12 + 4] = (long)(ra); \
} while (0)
#else
#error "Don't recognize this architecture!"
#endif
/*
* Kernel fatal error handler macro.
*/
#define PANIC(string) _thread_exit(__FILE__,__LINE__,string)
/* Output debug messages like this: */
#define stdout_debug(args...) do { \
char buf[128]; \
snprintf(buf, sizeof(buf), ##args); \
__sys_write(1, buf, strlen(buf)); \
} while (0)
#define stderr_debug(args...) do { \
char buf[128]; \
snprintf(buf, sizeof(buf), ##args); \
__sys_write(2, buf, strlen(buf)); \
} while (0)
/*
* Priority queue manipulation macros (using pqe link):
*/
#define PTHREAD_PRIOQ_INSERT_HEAD(thrd) _pq_insert_head(&_readyq,thrd)
#define PTHREAD_PRIOQ_INSERT_TAIL(thrd) _pq_insert_tail(&_readyq,thrd)
#define PTHREAD_PRIOQ_REMOVE(thrd) _pq_remove(&_readyq,thrd)
#define PTHREAD_PRIOQ_FIRST() _pq_first(&_readyq)
/*
* Waiting queue manipulation macros (using pqe link):
*/
#define PTHREAD_WAITQ_REMOVE(thrd) _waitq_remove(thrd)
#define PTHREAD_WAITQ_INSERT(thrd) _waitq_insert(thrd)
#if defined(_PTHREADS_INVARIANTS)
#define PTHREAD_WAITQ_CLEARACTIVE() _waitq_clearactive()
#define PTHREAD_WAITQ_SETACTIVE() _waitq_setactive()
#else
#define PTHREAD_WAITQ_CLEARACTIVE()
#define PTHREAD_WAITQ_SETACTIVE()
#endif
/*
* Work queue manipulation macros (using qe link):
*/
#define PTHREAD_WORKQ_INSERT(thrd) do { \
TAILQ_INSERT_TAIL(&_workq,thrd,qe); \
(thrd)->flags |= PTHREAD_FLAGS_IN_WORKQ; \
} while (0)
#define PTHREAD_WORKQ_REMOVE(thrd) do { \
TAILQ_REMOVE(&_workq,thrd,qe); \
(thrd)->flags &= ~PTHREAD_FLAGS_IN_WORKQ; \
} while (0)
/*
* State change macro without scheduling queue change:
*/
#define PTHREAD_SET_STATE(thrd, newstate) do { \
(thrd)->state = newstate; \
(thrd)->fname = __FILE__; \
(thrd)->lineno = __LINE__; \
} while (0)
/*
* State change macro with scheduling queue change - This must be
* called with preemption deferred (see thread_kern_sched_[un]defer).
*/
#if defined(_PTHREADS_INVARIANTS)
#include <assert.h>
#define PTHREAD_ASSERT(cond, msg) do { \
if (!(cond)) \
PANIC(msg); \
} while (0)
#define PTHREAD_ASSERT_NOT_IN_SYNCQ(thrd) \
PTHREAD_ASSERT((((thrd)->flags & PTHREAD_FLAGS_IN_SYNCQ) == 0), \
"Illegal call from signal handler");
#define PTHREAD_NEW_STATE(thrd, newstate) do { \
if (_thread_kern_new_state != 0) \
PANIC("Recursive PTHREAD_NEW_STATE"); \
_thread_kern_new_state = 1; \
if ((thrd)->state != newstate) { \
if ((thrd)->state == PS_RUNNING) { \
PTHREAD_PRIOQ_REMOVE(thrd); \
PTHREAD_WAITQ_INSERT(thrd); \
} else if (newstate == PS_RUNNING) { \
PTHREAD_WAITQ_REMOVE(thrd); \
PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
} \
} \
_thread_kern_new_state = 0; \
PTHREAD_SET_STATE(thrd, newstate); \
} while (0)
#else
#define PTHREAD_ASSERT(cond, msg)
#define PTHREAD_ASSERT_NOT_IN_SYNCQ(thrd)
#define PTHREAD_NEW_STATE(thrd, newstate) do { \
if ((thrd)->state != newstate) { \
if ((thrd)->state == PS_RUNNING) { \
PTHREAD_PRIOQ_REMOVE(thrd); \
PTHREAD_WAITQ_INSERT(thrd); \
} else if (newstate == PS_RUNNING) { \
PTHREAD_WAITQ_REMOVE(thrd); \
PTHREAD_PRIOQ_INSERT_TAIL(thrd); \
} \
} \
PTHREAD_SET_STATE(thrd, newstate); \
} while (0)
#endif
/*
* Define the signals to be used for scheduling.
*/
#if defined(_PTHREADS_COMPAT_SCHED)
#define _ITIMER_SCHED_TIMER ITIMER_VIRTUAL
#define _SCHED_SIGNAL SIGVTALRM
#else
#define _ITIMER_SCHED_TIMER ITIMER_PROF
#define _SCHED_SIGNAL SIGPROF
#endif
/*
* Priority queues.
*
* XXX It'd be nice if these were contained in uthread_priority_queue.[ch].
*/
typedef struct pq_list {
TAILQ_HEAD(, pthread) pl_head; /* list of threads at this priority */
TAILQ_ENTRY(pq_list) pl_link; /* link for queue of priority lists */
int pl_prio; /* the priority of this list */
int pl_queued; /* is this in the priority queue */
} pq_list_t;
typedef struct pq_queue {
TAILQ_HEAD(, pq_list) pq_queue; /* queue of priority lists */
pq_list_t *pq_lists; /* array of all priority lists */
int pq_size; /* number of priority lists */
} pq_queue_t;
/*
* TailQ initialization values.
*/
#define TAILQ_INITIALIZER { NULL, NULL }
/*
* Mutex definitions.
*/
union pthread_mutex_data {
void *m_ptr;
int m_count;
};
struct pthread_mutex {
enum pthread_mutextype m_type;
int m_protocol;
TAILQ_HEAD(mutex_head, pthread) m_queue;
struct pthread *m_owner;
union pthread_mutex_data m_data;
long m_flags;
int m_refcount;
/*
* Used for priority inheritence and protection.
*
* m_prio - For priority inheritence, the highest active
* priority (threads locking the mutex inherit
* this priority). For priority protection, the
* ceiling priority of this mutex.
* m_saved_prio - mutex owners inherited priority before
* taking the mutex, restored when the owner
* unlocks the mutex.
*/
int m_prio;
int m_saved_prio;
/*
* Link for list of all mutexes a thread currently owns.
*/
TAILQ_ENTRY(pthread_mutex) m_qe;
/*
* Lock for accesses to this structure.
*/
spinlock_t lock;
};
/*
* Flags for mutexes.
*/
#define MUTEX_FLAGS_PRIVATE 0x01
#define MUTEX_FLAGS_INITED 0x02
#define MUTEX_FLAGS_BUSY 0x04
/*
* Static mutex initialization values.
*/
#define PTHREAD_MUTEX_STATIC_INITIALIZER \
{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, TAILQ_INITIALIZER, \
NULL, { NULL }, MUTEX_FLAGS_PRIVATE, 0, 0, 0, TAILQ_INITIALIZER, \
_SPINLOCK_INITIALIZER }
struct pthread_mutex_attr {
enum pthread_mutextype m_type;
int m_protocol;
int m_ceiling;
long m_flags;
};
#define PTHREAD_MUTEXATTR_STATIC_INITIALIZER \
{ PTHREAD_MUTEX_DEFAULT, PTHREAD_PRIO_NONE, 0, MUTEX_FLAGS_PRIVATE }
/*
* Condition variable definitions.
*/
enum pthread_cond_type {
COND_TYPE_FAST,
COND_TYPE_MAX
};
struct pthread_cond {
enum pthread_cond_type c_type;
TAILQ_HEAD(cond_head, pthread) c_queue;
pthread_mutex_t c_mutex;
void *c_data;
long c_flags;
int c_seqno;
/*
* Lock for accesses to this structure.
*/
spinlock_t lock;
};
struct pthread_cond_attr {
enum pthread_cond_type c_type;
long c_flags;
};
/*
* Flags for condition variables.
*/
#define COND_FLAGS_PRIVATE 0x01
#define COND_FLAGS_INITED 0x02
#define COND_FLAGS_BUSY 0x04
/*
* Static cond initialization values.
*/
#define PTHREAD_COND_STATIC_INITIALIZER \
{ COND_TYPE_FAST, TAILQ_INITIALIZER, NULL, NULL, \
0, 0, _SPINLOCK_INITIALIZER }
/*
* Semaphore definitions.
*/
struct sem {
#define SEM_MAGIC ((u_int32_t) 0x09fa4012)
u_int32_t magic;
pthread_mutex_t lock;
pthread_cond_t gtzero;
u_int32_t count;
u_int32_t nwaiters;
};
/*
* Cleanup definitions.
*/
struct pthread_cleanup {
struct pthread_cleanup *next;
void (*routine) ();
void *routine_arg;
};
struct pthread_attr {
int sched_policy;
int sched_inherit;
int sched_interval;
int prio;
int suspend;
int flags;
void *arg_attr;
void (*cleanup_attr) ();
void *stackaddr_attr;
size_t stacksize_attr;
};
/*
* Thread creation state attributes.
*/
#define PTHREAD_CREATE_RUNNING 0
#define PTHREAD_CREATE_SUSPENDED 1
/*
* Additional state for a thread suspended with pthread_suspend_np().
*/
enum pthread_susp {
SUSP_NO, /* Not suspended. */
SUSP_YES, /* Suspended. */
SUSP_NOWAIT, /* Suspended, was in a mutex or condition queue. */
SUSP_MUTEX_WAIT,/* Suspended, still in a mutex queue. */
SUSP_COND_WAIT /* Suspended, still in a condition queue. */
};
/*
* Miscellaneous definitions.
*/
#define PTHREAD_STACK_DEFAULT 65536
/*
* Size of red zone at the end of each stack. In actuality, this "red zone" is
* merely an unmapped region, except in the case of the initial stack. Since
* mmap() makes it possible to specify the maximum growth of a MAP_STACK region,
* an unmapped gap between thread stacks achieves the same effect as explicitly
* mapped red zones.
*/
#define PTHREAD_STACK_GUARD PAGE_SIZE
/*
* Maximum size of initial thread's stack. This perhaps deserves to be larger
* than the stacks of other threads, since many applications are likely to run
* almost entirely on this stack.
*/
#define PTHREAD_STACK_INITIAL 0x100000
/* Size of the scheduler stack: */
#define SCHED_STACK_SIZE PAGE_SIZE
/*
* Define the different priority ranges. All applications have thread
* priorities constrained within 0-31. The threads library raises the
* priority when delivering signals in order to ensure that signal
* delivery happens (from the POSIX spec) "as soon as possible".
* In the future, the threads library will also be able to map specific
* threads into real-time (cooperating) processes or kernel threads.
* The RT and SIGNAL priorities will be used internally and added to
* thread base priorities so that the scheduling queue can handle both
* normal and RT priority threads with and without signal handling.
*
* The approach taken is that, within each class, signal delivery
* always has priority over thread execution.
*/
#define PTHREAD_DEFAULT_PRIORITY 15
#define PTHREAD_MIN_PRIORITY 0
#define PTHREAD_MAX_PRIORITY 31 /* 0x1F */
#define PTHREAD_SIGNAL_PRIORITY 32 /* 0x20 */
#define PTHREAD_RT_PRIORITY 64 /* 0x40 */
#define PTHREAD_FIRST_PRIORITY PTHREAD_MIN_PRIORITY
#define PTHREAD_LAST_PRIORITY \
(PTHREAD_MAX_PRIORITY + PTHREAD_SIGNAL_PRIORITY + PTHREAD_RT_PRIORITY)
#define PTHREAD_BASE_PRIORITY(prio) ((prio) & PTHREAD_MAX_PRIORITY)
/*
* Clock resolution in microseconds.
*/
#define CLOCK_RES_USEC 10000
/*
* Time slice period in microseconds.
*/
#define TIMESLICE_USEC 20000
/*
* Define a thread-safe macro to get the current time of day
* which is updated at regular intervals by the scheduling signal
* handler.
*/
#define GET_CURRENT_TOD(tv) \
do { \
tv.tv_sec = _sched_tod.tv_sec; \
tv.tv_usec = _sched_tod.tv_usec; \
} while (tv.tv_sec != _sched_tod.tv_sec)
struct pthread_key {
spinlock_t lock;
volatile int allocated;
volatile int count;
void (*destructor) ();
};
struct pthread_rwlockattr {
int pshared;
};
struct pthread_rwlock {
pthread_mutex_t lock; /* monitor lock */
int state; /* 0 = idle >0 = # of readers -1 = writer */
pthread_cond_t read_signal;
pthread_cond_t write_signal;
int blocked_writers;
};
/*
* Thread states.
*/
enum pthread_state {
PS_RUNNING,
PS_SIGTHREAD,
PS_MUTEX_WAIT,
PS_COND_WAIT,
PS_FDLR_WAIT,
PS_FDLW_WAIT,
PS_FDR_WAIT,
PS_FDW_WAIT,
PS_FILE_WAIT,
PS_POLL_WAIT,
PS_SELECT_WAIT,
PS_SLEEP_WAIT,
PS_WAIT_WAIT,
PS_SIGSUSPEND,
PS_SIGWAIT,
PS_SPINBLOCK,
PS_JOIN,
PS_SUSPENDED,
PS_DEAD,
PS_DEADLOCK,
PS_STATE_MAX
};
/*
* 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;
FILE *fp;
struct pthread_poll_data *poll_data;
spinlock_t *spinlock;
struct pthread *thread;
};
/*
* Define a continuation routine that can be used to perform a
* transfer of control:
*/
typedef void (*thread_continuation_t) (void *);
struct pthread_signal_frame;
struct pthread_state_data {
struct pthread_signal_frame *psd_curframe;
sigset_t psd_sigmask;
struct timespec psd_wakeup_time;
union pthread_wait_data psd_wait_data;
enum pthread_state psd_state;
int psd_flags;
int psd_interrupted;
int psd_longjmp_val;
int psd_sigmask_seqno;
int psd_signo;
int psd_sig_defer_count;
/* XXX - What about thread->timeout and/or thread->error? */
};
/*
* Normally thread contexts are stored as jmp_bufs via _setjmp()/_longjmp(),
* but they may also be sigjmp_buf and ucontext_t. When a thread is
* interrupted by a signal, it's context is saved as a ucontext_t. An
* application is also free to use [_]longjmp()/[_]siglongjmp() to jump
* between contexts within the same thread. Future support will also
* include setcontext()/getcontext().
*
* Define an enumerated type that can identify the 4 different context
* types.
*/
typedef enum {
CTX_JB_NOSIG, /* context is jmp_buf without saved sigset */
CTX_JB, /* context is jmp_buf (with saved sigset) */
CTX_SJB, /* context is sigjmp_buf (with saved sigset) */
CTX_UC /* context is ucontext_t (with saved sigset) */
} thread_context_t;
/*
* There are 2 basic contexts that a frame may contain at any
* one time:
*
* o ctx - The context that the thread should return to after normal
* completion of the signal handler.
* o sig_jb - The context just before the signal handler is invoked.
* Attempts at abnormal returns from user supplied signal handlers
* will return back to the signal context to perform any necessary
* cleanup.
*/
struct pthread_signal_frame {
/*
* This stores the threads state before the signal.
*/
struct pthread_state_data saved_state;
/*
* Threads return context; ctxtype identifies the type of context.
* For signal frame 0, these point to the context storage area
* within the pthread structure. When handling signals (frame > 0),
* these point to a context storage area that is allocated off the
* threads stack.
*/
union {
jmp_buf jb;
sigjmp_buf sigjb;
ucontext_t uc;
} ctx;
thread_context_t ctxtype;
int longjmp_val;
int signo; /* signal, arg 1 to sighandler */
int sig_has_args; /* use signal args if true */
ucontext_t uc;
siginfo_t siginfo;
};
/*
* 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;
u_int64_t uniqueid; /* for gdb */
/*
* 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;
/*
* Threads return context; ctxtype identifies the type of context.
*/
union {
jmp_buf jb;
sigjmp_buf sigjb;
ucontext_t uc;
} ctx;
thread_context_t ctxtype;
int longjmp_val;
/*
* Used for tracking delivery of signal handlers.
*/
struct pthread_signal_frame *curframe;
/*
* Cancelability flags - the lower 2 bits are used by cancel
* definitions in pthread.h
*/
#define PTHREAD_AT_CANCEL_POINT 0x0004
#define PTHREAD_CANCELLING 0x0008
#define PTHREAD_CANCEL_NEEDED 0x0010
int cancelflags;
enum pthread_susp suspended;
thread_continuation_t continuation;
/*
* Current signal mask and pending signals.
*/
sigset_t sigmask;
sigset_t sigpend;
int sigmask_seqno;
int check_pending;
/* Thread state: */
enum pthread_state state;
/* Scheduling clock when this thread was last made active. */
long last_active;
/* Scheduling clock when this thread was last made inactive. */
long last_inactive;
/*
* Number of microseconds accumulated by this thread when
* time slicing is active.
*/
long slice_usec;
/*
* 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:
*
* 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)
*
* It is possible for a thread to belong to more than one of the
* above queues if it is handling a signal. A thread may only
* enter a mutex, condition variable, or join queue when it is
* not being called from a signal handler. If a thread is a
* member of one of these queues when a signal handler is invoked,
* it must remain in the queue. For this reason, the links for
* these queues must not be (re)used for other queues.
*
* Use pqe for the scheduling queue link (both ready and waiting),
* sqe for synchronization (mutex, condition variable, and join)
* queue links, and qe for all other links.
*/
TAILQ_ENTRY(pthread) pqe; /* priority queue link */
TAILQ_ENTRY(pthread) sqe; /* synchronization queue link */
TAILQ_ENTRY(pthread) qe; /* all other queues link */
/* 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 flags; only set with signals deferred. */
int flags;
#define PTHREAD_FLAGS_PRIVATE 0x0001
#define PTHREAD_EXITING 0x0002
#define PTHREAD_FLAGS_IN_WAITQ 0x0004 /* in waiting queue using pqe link */
#define PTHREAD_FLAGS_IN_PRIOQ 0x0008 /* in priority queue using pqe link */
#define PTHREAD_FLAGS_IN_WORKQ 0x0010 /* in work queue using qe link */
#define PTHREAD_FLAGS_IN_FILEQ 0x0020 /* in file lock queue using qe link */
#define PTHREAD_FLAGS_IN_FDQ 0x0040 /* in fd lock queue using qe link */
#define PTHREAD_FLAGS_IN_CONDQ 0x0080 /* in condition queue using sqe link*/
#define PTHREAD_FLAGS_IN_MUTEXQ 0x0100 /* in mutex queue using sqe link */
#define PTHREAD_FLAGS_IN_JOINQ 0x0200 /* in join queue using sqe link */
#define PTHREAD_FLAGS_TRACE 0x0400 /* for debugging purposes */
#define PTHREAD_FLAGS_IN_SYNCQ \
(PTHREAD_FLAGS_IN_CONDQ | PTHREAD_FLAGS_IN_MUTEXQ | PTHREAD_FLAGS_IN_JOINQ)
/*
* 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. */
};
/* Spare thread stack. */
struct stack {
SLIST_ENTRY(stack) qe; /* Queue entry for this stack. */
};
/*
* 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
SCLASS int _sig_in_handler
#ifdef GLOBAL_PTHREAD_PRIVATE
= 0;
#else
;
#endif
/* Time of day at last scheduling timer signal: */
SCLASS struct timeval volatile _sched_tod
#ifdef GLOBAL_PTHREAD_PRIVATE
= { 0, 0 };
#else
;
#endif
/*
* Current scheduling timer ticks; used as resource usage.
*/
SCLASS unsigned int volatile _sched_ticks
#ifdef GLOBAL_PTHREAD_PRIVATE
= 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
= 0;
#else
;
#endif
SCLASS int _clock_res_usec /* Clock resolution in usec. */
#ifdef GLOBAL_PTHREAD_PRIVATE
= CLOCK_RES_USEC;
#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.
*/
SCLASS struct sigaction _thread_sigact[NSIG];
/*
* Array of counts of dummy handlers for SIG_DFL signals. This is used to
* assure that there is always a dummy signal handler installed while there is a
* thread sigwait()ing on the corresponding signal.
*/
SCLASS int _thread_dfl_count[NSIG];
/*
* Pending signals and mask for this process:
*/
SCLASS sigset_t _process_sigpending;
SCLASS sigset_t _process_sigmask
#ifdef GLOBAL_PTHREAD_PRIVATE
= { {0, 0, 0, 0} }
#endif
;
/*
* 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
;
/* Used to maintain pending and active signals: */
struct sigstatus {
int pending; /* Is this a pending signal? */
int blocked; /*
* A handler is currently active for
* this signal; ignore subsequent
* signals until the handler is done.
*/
int signo; /* arg 1 to signal handler */
siginfo_t siginfo; /* arg 2 to signal handler */
ucontext_t uc; /* arg 3 to signal handler */
};
SCLASS struct sigstatus _thread_sigq[NSIG];
/* Indicates that the signal queue needs to be checked. */
SCLASS volatile int _sigq_check_reqd
#ifdef GLOBAL_PTHREAD_PRIVATE
= 0
#endif
;
/* The signal stack. */
SCLASS struct sigaltstack _thread_sigstack;
/* Thread switch hook. */
SCLASS pthread_switch_routine_t _sched_switch_hook
#ifdef GLOBAL_PTHREAD_PRIVATE
= NULL
#endif
;
/*
* Spare stack queue. Stacks of default size are cached in order to reduce
* thread creation time. Spare stacks are used in LIFO order to increase cache
* locality.
*/
SCLASS SLIST_HEAD(, stack) _stackq;
/*
* Base address of next unallocated default-size {stack, red zone}. Stacks are
* allocated contiguously, starting below the bottom of the main stack. When a
* new stack is created, a red zone is created (actually, the red zone is simply
* left unmapped) below the bottom of the stack, such that the stack will not be
* able to grow all the way to the top of the next stack. This isn't
* fool-proof. It is possible for a stack to grow by a large amount, such that
* it grows into the next stack, and as long as the memory within the red zone
* is never accessed, nothing will prevent one thread stack from trouncing all
* over the next.
*/
SCLASS void * _next_stack
#ifdef GLOBAL_PTHREAD_PRIVATE
/* main stack top - main stack size - stack size - (red zone + main stack red zone) */
= (void *) USRSTACK - PTHREAD_STACK_INITIAL - PTHREAD_STACK_DEFAULT - (2 * PTHREAD_STACK_GUARD)
#endif
;
/*
* Declare the kernel scheduler jump buffer and stack:
*/
SCLASS jmp_buf _thread_kern_sched_jb;
SCLASS void * _thread_kern_sched_stack
#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);
void _cond_wait_backout(pthread_t);
void _fd_lock_backout(pthread_t);
int _find_dead_thread(pthread_t);
int _find_thread(pthread_t);
void _flockfile_backout(pthread_t);
void _funlock_owned(pthread_t);
struct pthread *_get_curthread(void);
void _set_curthread(struct pthread *);
void _join_backout(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);
int _mutex_cv_lock(pthread_mutex_t *);
int _mutex_cv_unlock(pthread_mutex_t *);
void _mutex_lock_backout(pthread_t);
void _mutex_notify_priochange(pthread_t);
int _mutex_reinit(pthread_mutex_t *);
void _mutex_unlock_private(pthread_t);
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);
void *_pthread_getspecific(pthread_key_t);
int _pthread_key_create(pthread_key_t *, void (*) (void *));
int _pthread_key_delete(pthread_key_t);
int _pthread_mutex_destroy(pthread_mutex_t *);
int _pthread_mutex_init(pthread_mutex_t *, const pthread_mutexattr_t *);
int _pthread_mutex_lock(pthread_mutex_t *);
int _pthread_mutex_trylock(pthread_mutex_t *);
int _pthread_mutex_unlock(pthread_mutex_t *);
int _pthread_mutexattr_init(pthread_mutexattr_t *);
int _pthread_mutexattr_destroy(pthread_mutexattr_t *);
int _pthread_mutexattr_settype(pthread_mutexattr_t *, int);
int _pthread_once(pthread_once_t *, void (*) (void));
int _pthread_setspecific(pthread_key_t, const void *);
void _waitq_insert(pthread_t pthread);
void _waitq_remove(pthread_t pthread);
#if defined(_PTHREADS_INVARIANTS)
void _waitq_setactive(void);
void _waitq_clearactive(void);
#endif
void _thread_exit(char *, int, char *);
void _thread_exit_cleanup(void);
void _thread_fd_unlock(int, int);
void _thread_fd_unlock_debug(int, int, char *, int);
void _thread_fd_unlock_owned(pthread_t);
void *_thread_cleanup(pthread_t);
void _thread_cleanupspecific(void);
void _thread_dump_info(void);
void _thread_init(void);
void _thread_kern_sched(ucontext_t *);
void _thread_kern_scheduler(void);
void _thread_kern_sched_frame(struct pthread_signal_frame *psf);
void _thread_kern_sched_sig(void);
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(const struct timespec *);
void _thread_kern_sig_defer(void);
void _thread_kern_sig_undefer(void);
void _thread_sig_handler(int, siginfo_t *, ucontext_t *);
void _thread_sig_check_pending(pthread_t pthread);
void _thread_sig_handle_pending(void);
void _thread_sig_send(pthread_t pthread, int sig);
void _thread_sig_wrapper(void);
void _thread_sigframe_restore(pthread_t thread, struct pthread_signal_frame *psf);
void _thread_start(void);
void _thread_seterrno(pthread_t, int);
int _thread_fd_table_init(int fd);
pthread_addr_t _thread_gc(pthread_addr_t);
void _thread_enter_cancellation_point(void);
void _thread_leave_cancellation_point(void);
void _thread_cancellation_point(void);
/* #include <sys/aio.h> */
#ifdef _SYS_AIO_H_
int __sys_aio_suspend(const struct aiocb * const[], int, const struct timespec *);
#endif
/* #include <signal.h> */
#ifdef _SIGNAL_H_
int __sys_sigaction(int, const struct sigaction *, struct sigaction *);
int __sys_sigpending(sigset_t *);
int __sys_sigprocmask(int, const sigset_t *, sigset_t *);
int __sys_sigsuspend(const sigset_t *);
int __sys_sigreturn(ucontext_t *);
int __sys_sigaltstack(const struct sigaltstack *, struct sigaltstack *);
#endif
/* #include <sys/stat.h> */
#ifdef _SYS_STAT_H_
int __sys_fchmod(int, mode_t);
int __sys_fstat(int, struct stat *);
int __sys_fchflags(int, u_long);
#endif
/* #include <sys/mount.h> */
#ifdef _SYS_MOUNT_H_
int __sys_fstatfs(int, struct statfs *);
#endif
/* #inclde <sys/event.h> */
#ifdef _SYS_EVENT_H_
int __sys_kevent(int, const struct kevent *, int, struct kevent *,
int, const struct timespec *);
#endif
/* #include <sys/socket.h> */
#ifdef _SYS_SOCKET_H_
int __sys_accept(int, struct sockaddr *, int *);
int __sys_bind(int, const struct sockaddr *, int);
int __sys_connect(int, const struct sockaddr *, int);
int __sys_getpeername(int, struct sockaddr *, int *);
int __sys_getsockname(int, struct sockaddr *, int *);
int __sys_getsockopt(int, int, int, void *, int *);
int __sys_listen(int, int);
int __sys_setsockopt(int, int, int, const void *, int);
int __sys_shutdown(int, int);
int __sys_socket(int, int, int);
int __sys_socketpair(int, int, int, int *);
ssize_t __sys_recvfrom(int, void *, size_t, int, struct sockaddr *, int *);
ssize_t __sys_recvmsg(int, struct msghdr *, int);
ssize_t __sys_send(int, const void *, size_t, int);
int __sys_sendfile(int, int, off_t, size_t, struct sf_hdtr *, off_t *, int);
ssize_t __sys_sendmsg(int, const struct msghdr *, int);
ssize_t __sys_sendto(int, const void *,size_t, int, const struct sockaddr *, int);
#endif
/* #include <unistd.h> */
#ifdef _UNISTD_H_
int __sys_close(int);
int __sys_dup(int);
int __sys_dup2(int, int);
int __sys_execve(const char *, char * const *, char * const *);
int __sys_fchown(int, uid_t, gid_t);
int __sys_fork(void);
int __sys_fsync(int);
int __sys_pipe(int *);
int __sys_select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
long __sys_fpathconf(int, int);
ssize_t __sys_read(int, void *, size_t);
ssize_t __sys_write(int, const void *, size_t);
void __sys_exit(int);
#endif
/* #include <fcntl.h> */
#ifdef _SYS_FCNTL_H_
int __sys_fcntl(int, int, ...);
int __sys_flock(int, int);
int __sys_open(const char *, int, ...);
#endif
/* #include <sys/ioctl.h> */
#ifdef _SYS_IOCTL_H_
int __sys_ioctl(int, unsigned long, ...);
#endif
/* #include <dirent.h> */
#ifdef _DIRENT_H_
int __sys_getdirentries(int, char *, int, long *);
#endif
/* #include <sys/uio.h> */
#ifdef _SYS_UIO_H_
ssize_t __sys_readv(int, const struct iovec *, int);
ssize_t __sys_writev(int, const struct iovec *, int);
#endif
/* #include <sys/wait.h> */
#ifdef WNOHANG
pid_t __sys_wait4(pid_t, int *, int, struct rusage *);
#endif
/* #include <poll.h> */
#ifdef _SYS_POLL_H_
int __sys_poll(struct pollfd *, unsigned, int);
#endif
/* #include <sys/mman.h> */
#ifdef _SYS_MMAN_H_
int __sys_msync(void *, size_t, int);
#endif
/* #include <setjmp.h> */
#ifdef _SETJMP_H_
extern void __siglongjmp(sigjmp_buf, int) __dead2;
extern void __longjmp(jmp_buf, int) __dead2;
extern void ___longjmp(jmp_buf, int) __dead2;
#endif
__END_DECLS
#endif /* !_PTHREAD_PRIVATE_H */
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