/* $OpenBSD: pthread_private.h,v 1.74 2010/01/03 23:05:35 fgsch Exp $ */ /* * Copyright (c) 1995-1998 John Birrell . * 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: pthread_private.h,v 1.27 1999/09/29 15:18:38 marcel Exp $ */ #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 #include #include #include #include #include #include #include #include #include "thread_private.h" #include "uthread_machdep.h" /* * Kernel fatal error handler macro. */ #define PANIC(string) _thread_exit(__FILE__,__LINE__,string) /* Output debug messages like this: */ #define stdout_debug(_x) _thread_sys_write(1,_x,strlen(_x)); #define stderr_debug(_x) _thread_sys_write(2,_x,strlen(_x)); /* * 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 #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) || defined(PROF) #define _ITIMER_SCHED_TIMER ITIMER_VIRTUAL #define _SCHED_SIGNAL SIGVTALRM #else #define _ITIMER_SCHED_TIMER ITIMER_PROF #define _SCHED_SIGNAL SIGPROF #endif /* Lists with volatile elements */ #define V_TAILQ_HEAD(name, type) \ volatile struct name { \ struct type * tqh_first; \ struct type * volatile * tqh_last; \ } #define V_TAILQ_ENTRY(type) \ volatile struct { \ struct type * tqe_next; \ struct type * volatile * tqe_prev; \ } /* List of all threads: */ typedef V_TAILQ_HEAD(, pthread) _thread_list_t; /* * Priority queues. * * XXX It'd be nice if these were contained in uthread_priority_queue.[ch]. */ typedef struct pq_list { _thread_list_t 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; V_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. */ V_TAILQ_ENTRY(pthread_mutex volatile) 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; V_TAILQ_HEAD(cond_head, pthread) c_queue; pthread_mutex_t c_mutex; 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*); void *routine_arg; }; struct pthread_atfork { TAILQ_ENTRY(pthread_atfork) qe; void (*prepare)(void); void (*parent)(void); void (*child)(void); }; 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*); void *stackaddr_attr; size_t stacksize_attr; size_t guardsize_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_JOIN, /* Suspended, joining. */ 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. */ #ifdef __LP64__ #define PTHREAD_STACK_DEFAULT (512 * 1024) #else #define PTHREAD_STACK_DEFAULT (256 * 1024) #endif /* * 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 /* * 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 #define CLOCK_RES_USEC_MIN 1000 /* * 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)(void*); }; 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) #define FD_RDWR_CLOSE (FD_RDWR | 0x4) #define _FD_LOCK(_fd,_type,_ts) _thread_fd_lock(_fd, _type, _ts) #define _FD_UNLOCK(_fd,_type) _thread_fd_unlock(_fd, _type) /* Get a suitable argument for _thread_kern_set_timeout(), given an fd */ #define _FD_RCVTIMEO(_fd) _thread_fd_timeout((_fd), 0) #define _FD_SNDTIMEO(_fd) _thread_fd_timeout((_fd), 1) /* * File status flags structure - shared for dup'ed fd's */ struct fs_flags { int flags; #define _FD_NOTSOCK O_EXCL /* Not a socket. */ int refcnt; SLIST_ENTRY(fs_flags) fe; /* free list entry. */ }; /* * fd_table_entry states */ enum fd_entry_state { FD_ENTRY_OPEN, FD_ENTRY_CLOSING, FD_ENTRY_CLOSED }; /* * Defines for _thread_fd_table_init init_mode */ enum fd_entry_mode { FD_INIT_UNKNOWN, /* inherited or not created by pthreads wrapper */ FD_INIT_NEW, /* new fd opened by pthreads */ FD_INIT_BLOCKING, /* new user blocking fd opened by pthreads */ FD_INIT_DUP, /* new fd with passed flags */ FD_INIT_DUP2, /* replace status_flags and open */ }; /* * File descriptor table structure. */ struct fd_table_entry { _thread_list_t r_queue; /* Read queue. */ _thread_list_t w_queue; /* Write queue. */ struct pthread *r_owner; /* thread owning read lock. */ struct pthread *w_owner; /* thread owning write lock. */ const char *r_fname; /* read lock source file name */ int r_lineno; /* Read lock source line no. */ const char *w_fname; /* write lock src file name */ int w_lineno; /* Write lock src line no. */ int r_lockcount; /* Count for FILE read locks. */ int w_lockcount; /* Count for FILE write locks.*/ struct fs_flags *status_flags; /* Shared file status flags. */ enum fd_entry_state state; /* Open, closing, or closed. */ enum fd_entry_mode init_mode; /* The mode used for init. */ SLIST_ENTRY(fd_table_entry) fe; /* Free list entry. */ }; struct pthread_poll_data { nfds_t 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 { int fd; /* Used when thread waiting on fd */ int branch; /* Line number, for debugging. */ const char *fname; /* Source file name for debugging.*/ } fd; FILE *fp; struct pthread_poll_data *poll_data; spinlock_t *spinlock; struct pthread *thread; }; /* Spare thread stack. */ struct stack { SLIST_ENTRY(stack) qe; /* Queue entry for this stack. */ void *base; /* Bottom of useful stack */ size_t size; /* Size of useful stack */ size_t guardsize; /* Size of red zone */ void *redzone; /* Red zone location */ void *storage; /* allocated storage */ }; /* * Define a continuation routine that can be used to perform a * transfer of control: */ typedef void (*thread_continuation_t) (struct pthread *); typedef V_TAILQ_ENTRY(pthread) pthread_entry_t; struct join_status { struct pthread *thread; void *ret; int error; }; /* * 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: */ pthread_entry_t tle; /* Queue entry for list of dead threads: */ pthread_entry_t dle; /* * Thread start routine, argument, stack pointer and thread * attributes. */ void *(*start_routine)(void *); void *arg; struct stack *stack; struct pthread_attr attr; /* * Saved signal context used in call to sigreturn by * _thread_kern_sched if sig_saved is TRUE. */ struct sigcontext saved_sigcontext; /* * Machine-dependent context, valid if sig_saved is FALSE. */ struct _machdep_state _machdep; /* * TRUE if the last state saved was a signal context. FALSE if the * last state saved was a jump buffer. */ int sig_saved; /* * 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; /* 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; /* * The joiner is the thread that is joining to this thread. The * join status keeps track of a join operation to another thread. */ struct pthread *joiner; struct join_status join_status; /* * 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 a file descriptor lock * o A queue of threads needing work done by the kernel thread * (waiting for a spinlock or file I/O) * * A thread can also be joining a thread (the joiner field above). * * It must not be possible for a thread to belong to any of the * above queues while it is handling a signal. Signal handlers * may longjmp back to previous stack frames circumventing normal * control flow. This could corrupt queue integrity if the thread * retains membership in the queue. Therefore, if a thread is a * member of one of these queues when a signal handler is invoked, * it must remove itself from the queue before calling the signal * handler and reinsert itself after normal return of the handler. * * Use pqe for the scheduling queue link (both ready and waiting), * sqe for synchronization (mutex and condition variable) queue * links, and qe for all other links. */ pthread_entry_t pqe; /* priority queue link */ pthread_entry_t sqe; /* synchronization queue link */ pthread_entry_t 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; /* * Set to TRUE if a blocking operation was * interrupted by a closing file descriptor. */ int closing_fd; /* 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_TRACE 0x0200 /* for debugging purposes */ #define PTHREAD_FLAGS_IN_SYNCQ \ (PTHREAD_FLAGS_IN_CONDQ | PTHREAD_FLAGS_IN_MUTEXQ) /* * 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. */ int 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. */ int 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. */ int active_priority; /* Number of priority ceiling or protection mutexes owned. */ int priority_mutex_count; /* Number rwlocks rdlocks held. */ int rdlock_count; /* * Queue of currently owned mutexes. */ V_TAILQ_HEAD(, pthread_mutex volatile) mutexq; void *ret; const void **specific_data; int specific_data_count; /* Cleanup handlers Link List */ struct pthread_cleanup *cleanup; const char *fname; /* Ptr to source file name */ int lineno; /* Source line number. */ }; /* * Flags and prototypes for the machine dependent layer */ void _thread_machdep_switch(struct _machdep_state *newstate, struct _machdep_state *savestate); void _thread_machdep_init(struct _machdep_state *state, void *stackbase, int stacksize, void (*entry)(void)); void _thread_machdep_save_float_state(struct _machdep_state* statep); void _thread_machdep_restore_float_state(struct _machdep_state* statep); /* * 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 SCLASS _thread_list_t _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 volatile _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 _thread_list_t _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 SCLASS TAILQ_HEAD(atfork_head, pthread_atfork) _atfork_list; SCLASS pthread_mutex_t _atfork_mutex; /* 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, 0 /* set in _thread_init() */ }; #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 /* 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 int _thread_init_fdtsize /* Initial fd/pfd table size. */ #ifdef GLOBAL_PTHREAD_PRIVATE = 0; #else ; #endif SCLASS int _thread_max_fdtsize /* Max fd table size. */ #ifdef GLOBAL_PTHREAD_PRIVATE = 0; #else ; #endif SCLASS nfds_t _thread_max_pfdtsize /* Max pfd 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 #endif ; /* * Scheduling queues: */ SCLASS pq_queue_t _readyq; SCLASS _thread_list_t _waitingq; /* * Work queue: */ SCLASS _thread_list_t _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 { spinlock_t lock; /* structure access lock */ int pending; /* Is this a pending signal? */ siginfo_t siginfo; /* arg 2 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. */ typedef SLIST_HEAD(, stack) _stack_list_t; extern _stack_list_t _stackq; /* Used for _PTHREADS_INVARIANTS checking. */ SCLASS int _thread_kern_new_state #ifdef GLOBAL_PTHREAD_PRIVATE = 0; #else ; #endif /* Undefine the storage class specifier: */ #undef SCLASS /* * Function prototype definitions. */ __BEGIN_DECLS int *__error(void); int _find_thread(pthread_t); struct pthread *_get_curthread(void); void _set_curthread(struct pthread *); int _thread_create(pthread_t *, const pthread_attr_t *, void *(*start_routine)(void *), void *,pthread_t); void _dispatch_signal(int, struct sigcontext *); void _dispatch_signals(struct sigcontext *); 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); 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 __dead void _thread_exit(const char *, int, const char *) __attribute__((__noreturn__)); void *_thread_cleanup(pthread_t); void _thread_cleanupspecific(void); void _thread_clear_pending(int, pthread_t); void _thread_dump_data(const void *, int); void _thread_dump_info(void); int _thread_fd_lock(int, int, struct timespec *); void _thread_fd_unlock(int, int); struct timespec *_thread_fd_timeout(int, int); void _thread_init(void); void _thread_kern_lock(int); void _thread_kern_sched(struct sigcontext *); void _thread_kern_sched_state(enum pthread_state, const char *, int); void _thread_kern_sched_state_unlock(enum pthread_state, spinlock_t *, const char *, int); void _thread_kern_set_timeout(const struct timespec *); void _thread_kern_sig_defer(void); void _thread_kern_sig_undefer(void); void _thread_key_init(void); void _thread_kill_siginfo(int); void _thread_sig_handler(int, siginfo_t *, struct sigcontext *); int _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); void _thread_fs_flags_replace(int, struct fs_flags *); int _thread_fd_init_mem(void); void _thread_fd_init(void); int _thread_fd_table_init(int, enum fd_entry_mode, struct fs_flags *); void _thread_fd_entry_close(int); 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); int _thread_slow_atomic_lock(volatile _spinlock_lock_t *); int _thread_slow_atomic_is_locked(volatile _spinlock_lock_t *); struct stack * _thread_stack_alloc(void *, size_t, size_t); void _thread_stack_free(struct stack *); /* #include */ #ifdef _USER_SIGNAL_H int _thread_sys_kill(pid_t, int); int _thread_sys_sigaction(int, const struct sigaction *, struct sigaction *); int _thread_sys_sigblock(int); int _thread_sys_sigsetmask(int); 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_sigaltstack(const struct sigaltstack *, struct sigaltstack *); 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); #endif /* #include */ #ifdef _SYS_STAT_H_ int _thread_sys_fchmod(int, mode_t); int _thread_sys_fstat(int, struct stat *); int _thread_sys_fchflags(int, unsigned int); #endif /* #include */ #ifdef _SYS_MOUNT_H_ int _thread_sys_fstatfs(int, struct statfs *); #endif int _thread_sys_pipe(int *); /* #include */ #ifdef _SYS_SOCKET_H_ int _thread_sys_accept(int, struct sockaddr *, socklen_t *); int _thread_sys_bind(int, const struct sockaddr *, socklen_t); int _thread_sys_connect(int, const struct sockaddr *, socklen_t); int _thread_sys_getpeername(int, struct sockaddr *, socklen_t *); int _thread_sys_getsockname(int, struct sockaddr *, socklen_t *); int _thread_sys_getsockopt(int, int, int, void *, socklen_t *); int _thread_sys_listen(int, int); int _thread_sys_setsockopt(int, int, int, const void *, socklen_t); 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 *, socklen_t *); 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); ssize_t _thread_sys_sendto(int, const void *,size_t, int, const struct sockaddr *, socklen_t); #endif /* #include */ #ifdef _STDIO_H_ FILE *_thread_sys_fdopen(int, const char *); FILE *_thread_sys_fopen(const char *, const char *); FILE *_thread_sys_freopen(const char *, const char *, FILE *); FILE *_thread_sys_popen(const char *, const char *); FILE *_thread_sys_tmpfile(void); char *_thread_sys_ctermid(char *); char *_thread_sys_cuserid(char *); char *_thread_sys_fgetln(FILE *, size_t *); char *_thread_sys_fgets(char *, int, FILE *); char *_thread_sys_gets(char *); char *_thread_sys_tempnam(const char *, const char *); char *_thread_sys_tmpnam(char *); int _thread_sys_fclose(FILE *); int _thread_sys_feof(FILE *); int _thread_sys_ferror(FILE *); int _thread_sys_fflush(FILE *); int _thread_sys_fgetc(FILE *); int _thread_sys_fgetpos(FILE *, fpos_t *); int _thread_sys_fileno(FILE *); int _thread_sys_fprintf(FILE *, const char *, ...); int _thread_sys_fpurge(FILE *); int _thread_sys_fputc(int, FILE *); int _thread_sys_fputs(const char *, FILE *); int _thread_sys_fscanf(FILE *, const char *, ...); int _thread_sys_fseek(FILE *, long, int); int _thread_sys_fsetpos(FILE *, const fpos_t *); int _thread_sys_getc(FILE *); int _thread_sys_getchar(void); int _thread_sys_getw(FILE *); int _thread_sys_pclose(FILE *); int _thread_sys_printf(const char *, ...); int _thread_sys_putc(int, FILE *); int _thread_sys_putchar(int); int _thread_sys_puts(const char *); int _thread_sys_putw(int, FILE *); int _thread_sys_remove(const char *); 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 *, __va_list); int _thread_sys_vprintf(const char *, __va_list); int _thread_sys_vscanf(const char *, __va_list); int _thread_sys_vsnprintf(char *, size_t, const char *, __va_list); int _thread_sys_vsprintf(char *, const char *, __va_list); int _thread_sys_vsscanf(const char *, const char *, __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 */ #ifdef _UNISTD_H_ char *_thread_sys_ttyname(int); int _thread_sys_close(int); int _thread_sys_closefrom(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); long _thread_sys_fpathconf(int, int); pid_t _thread_sys_getpid(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_vfork(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); __dead void _thread_sys__exit(int) __attribute__((__noreturn__)); #endif /* #include */ #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 */ #ifdef _SYS_IOCTL_H_ int _thread_sys_ioctl(int, unsigned long, ...); #endif /* #include */ #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 */ #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 */ #ifdef _SYS_WAIT_H_ 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 */ #ifdef _SYS_POLL_H_ int _thread_sys_poll(struct pollfd *, unsigned, int); #endif /* #include */ #ifdef _SYS_EVENT_H_ int _thread_sys_kqueue(void); int _thread_sys_kevent(int, const struct kevent *, int, struct kevent *, int, const struct timespec *); #endif /* #include */ int _thread_sys_msync(void *, size_t, int); __END_DECLS #endif /* !_PTHREAD_PRIVATE_H */