/* $OpenBSD: rthread.h,v 1.57 2016/04/15 17:54:17 tedu Exp $ */ /* * Copyright (c) 2004,2005 Ted Unangst * All Rights Reserved. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ /* * Private data structures that back up the typedefs in pthread.h. * Since only the thread library cares about their size or arrangement, * it should be possible to switch libraries without relinking. * * Do not reorder struct _spinlock and sem_t variables in the structs. * This is due to alignment requirements of certain arches like hppa. * The current requirement is 16 bytes. * * THE MACHINE DEPENDENT CERROR CODE HAS HARD CODED OFFSETS INTO PTHREAD_T! */ #include #include #include #include /* for TLS_VARIANT */ #ifdef __LP64__ #define RTHREAD_STACK_SIZE_DEF (512 * 1024) #else #define RTHREAD_STACK_SIZE_DEF (256 * 1024) #endif #define _USING_TICKETS 0 /* * tickets don't work yet? (or seem much slower, with lots of system time) * until then, keep the struct around to avoid excessive changes going * back and forth. */ struct _spinlock { _atomic_lock_t ticket; }; #define _SPINLOCK_UNLOCKED { _ATOMIC_LOCK_UNLOCKED } extern struct _spinlock _SPINLOCK_UNLOCKED_ASSIGN; struct stack { SLIST_ENTRY(stack) link; /* link for free default stacks */ void *sp; /* machine stack pointer */ void *base; /* bottom of allocated area */ size_t guardsize; /* size of PROT_NONE zone or */ /* ==1 if application alloced */ size_t len; /* total size of allocated stack */ }; struct __sem { struct _spinlock lock; volatile int waitcount; volatile int value; int shared; }; TAILQ_HEAD(pthread_queue, pthread); struct pthread_mutex { struct _spinlock lock; struct pthread_queue lockers; int type; pthread_t owner; int count; int prioceiling; }; struct pthread_mutex_attr { int ma_type; int ma_protocol; int ma_prioceiling; }; struct pthread_cond { struct _spinlock lock; struct pthread_queue waiters; struct pthread_mutex *mutex; clockid_t clock; }; struct pthread_cond_attr { clockid_t ca_clock; }; struct pthread_rwlock { struct _spinlock lock; pthread_t owner; struct pthread_queue writers; int readers; }; struct pthread_rwlockattr { int pshared; }; struct pthread_attr { void *stack_addr; size_t stack_size; size_t guard_size; int detach_state; int contention_scope; int sched_policy; struct sched_param sched_param; int sched_inherit; }; #define PTHREAD_MIN_PRIORITY 0 #define PTHREAD_MAX_PRIORITY 31 struct rthread_key { int used; void (*destructor)(void *); }; struct rthread_storage { int keyid; struct rthread_storage *next; void *data; }; struct rthread_cleanup_fn { void (*fn)(void *); void *arg; struct rthread_cleanup_fn *next; }; struct pthread_barrier { pthread_mutex_t mutex; pthread_cond_t cond; int threshold; int in; int out; int generation; }; struct pthread_barrierattr { int pshared; }; struct pthread_spinlock { struct _spinlock lock; pthread_t owner; }; struct pthread { struct __sem donesem; #if TLS_VARIANT == 1 int *errno_ptr; #endif pid_t tid; unsigned int flags; struct _spinlock flags_lock; void *tcb; void *retval; void *(*fn)(void *); void *arg; char name[32]; struct stack *stack; LIST_ENTRY(pthread) threads; TAILQ_ENTRY(pthread) waiting; pthread_cond_t blocking_cond; struct pthread_attr attr; struct rthread_storage *local_storage; struct rthread_cleanup_fn *cleanup_fns; int myerrno; /* currently in a cancel point? */ int cancel_point; /* cancel received in a delayed cancel block? */ int delayed_cancel; }; #define THREAD_DONE 0x001 #define THREAD_DETACHED 0x002 #define THREAD_CANCELED 0x004 #define THREAD_CANCEL_ENABLE 0x008 #define THREAD_CANCEL_DEFERRED 0x010 #define THREAD_CANCEL_DELAY 0x020 #define THREAD_DYING 0x040 #define THREAD_ORIGINAL 0x080 /* original thread from fork */ #define THREAD_INITIAL_STACK 0x100 /* thread with stack from exec */ #define IS_CANCELED(thread) \ (((thread)->flags & (THREAD_CANCELED|THREAD_DYING)) == THREAD_CANCELED) extern int _threads_ready; extern size_t _thread_pagesize; extern LIST_HEAD(listhead, pthread) _thread_list; extern struct _spinlock _thread_lock; extern struct pthread_attr _rthread_attr_default; #define ROUND_TO_PAGE(size) \ (((size) + (_thread_pagesize - 1)) & ~(_thread_pagesize - 1)) void _spinlock(volatile struct _spinlock *); int _spinlocktry(volatile struct _spinlock *); void _spinunlock(volatile struct _spinlock *); int _sem_wait(sem_t, int, const struct timespec *, int *); int _sem_post(sem_t); int _rthread_init(void); void _rthread_setflag(pthread_t, int); void _rthread_clearflag(pthread_t, int); struct stack *_rthread_alloc_stack(pthread_t); void _rthread_free_stack(struct stack *); void _rthread_tls_destructors(pthread_t); void _rthread_debug(int, const char *, ...) __attribute__((__format__ (printf, 2, 3))); void _rthread_debug_init(void); #ifndef NO_PIC void _rthread_dl_lock(int what); #endif void _thread_malloc_reinit(void); /* rthread_cancel.c */ void _enter_cancel(pthread_t); void _leave_cancel(pthread_t); void _enter_delayed_cancel(pthread_t); void _leave_delayed_cancel(pthread_t, int); void _thread_dump_info(void); /* syscalls not declared in system headers */ #define REDIRECT_SYSCALL(x) typeof(x) x asm("_thread_sys_"#x) void __threxit(pid_t *); int __thrsleep(const volatile void *, clockid_t, const struct timespec *, volatile void *, const int *); int __thrwakeup(const volatile void *, int n); int __thrsigdivert(sigset_t, siginfo_t *, const struct timespec *);