/* $NetBSD: pthread_int.h,v 1.95.2.3 2023/08/04 13:04:03 martin Exp $ */ /*- * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Nathan J. Williams and Andrew Doran. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #ifndef _LIB_PTHREAD_INT_H #define _LIB_PTHREAD_INT_H #include /* #define PTHREAD__DEBUG */ #define ERRORCHECK #include "pthread_types.h" #include "pthread_queue.h" #include "pthread_md.h" /* Need to use libc-private names for atomic operations. */ #include "../../common/lib/libc/atomic/atomic_op_namespace.h" #include #include #include #include #include #include #ifdef __GNUC__ #define PTHREAD_HIDE __attribute__ ((visibility("hidden"))) #else #define PTHREAD_HIDE /* nothing */ #endif #define PTHREAD__UNPARK_MAX 128 /* * The size of this structure needs to be no larger than struct * __pthread_cleanup_store, defined in pthread.h. */ struct pt_clean_t { PTQ_ENTRY(pt_clean_t) ptc_next; void (*ptc_cleanup)(void *); void *ptc_arg; }; /* Private data for pthread_attr_t */ struct pthread_attr_private { char ptap_name[PTHREAD_MAX_NAMELEN_NP]; void *ptap_namearg; void *ptap_stackaddr; size_t ptap_stacksize; size_t ptap_guardsize; struct sched_param ptap_sp; int ptap_policy; }; struct pthread_lock_ops { void (*plo_init)(__cpu_simple_lock_t *); int (*plo_try)(__cpu_simple_lock_t *); void (*plo_unlock)(__cpu_simple_lock_t *); void (*plo_lock)(__cpu_simple_lock_t *); }; struct __pthread_st { pthread_t pt_self; /* Must be first. */ #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) struct tls_tcb *pt_tls; /* Thread Local Storage area */ #endif unsigned int pt_magic; /* Magic number */ int pt_state; /* running, blocked, etc. */ pthread_mutex_t pt_lock; /* lock on state */ int pt_flags; /* see PT_FLAG_* below */ int pt_cancel; /* Deferred cancellation */ int pt_errno; /* Thread-specific errno. */ stack_t pt_stack; /* Our stack */ bool pt_stack_allocated; size_t pt_guardsize; void *pt_exitval; /* Read by pthread_join() */ char *pt_name; /* Thread's name, set by the app. */ int pt_willpark; /* About to park */ lwpid_t pt_unpark; /* Unpark this when parking */ struct pthread_lock_ops pt_lockops;/* Cached to avoid PIC overhead */ pthread_mutex_t *pt_droplock; /* Drop this lock if cancelled */ pthread_cond_t pt_joiners; /* Threads waiting to join. */ void *(*pt_func)(void *);/* Function to call at start. */ void *pt_arg; /* Argument to pass at start. */ /* Threads to defer waking, usually until pthread_mutex_unlock(). */ lwpid_t pt_waiters[PTHREAD__UNPARK_MAX]; size_t pt_nwaiters; /* Stack of cancellation cleanup handlers and their arguments */ PTQ_HEAD(, pt_clean_t) pt_cleanup_stack; /* LWP ID and entry on the list of all threads. */ lwpid_t pt_lid; rb_node_t pt_alltree; PTQ_ENTRY(__pthread_st) pt_allq; PTQ_ENTRY(__pthread_st) pt_deadq; /* * General synchronization data. We try to align, as threads * on other CPUs will access this data frequently. */ int pt_dummy1 __aligned(128); struct lwpctl *pt_lwpctl; /* Kernel/user comms area */ volatile int pt_rwlocked; /* Handed rwlock successfully */ volatile int pt_signalled; /* Received pthread_cond_signal() */ volatile int pt_mutexwait; /* Waiting to acquire mutex */ void * volatile pt_mutexnext; /* Next thread in chain */ void * volatile pt_sleepobj; /* Object slept on */ PTQ_ENTRY(__pthread_st) pt_sleep; void (*pt_early)(void *); int pt_dummy2 __aligned(128); /* Thread-specific data. Large so it sits close to the end. */ int pt_havespecific; struct pt_specific { void *pts_value; PTQ_ENTRY(pt_specific) pts_next; } pt_specific[]; }; /* Thread states */ #define PT_STATE_RUNNING 1 #define PT_STATE_ZOMBIE 5 #define PT_STATE_DEAD 6 /* Flag values */ #define PT_FLAG_DETACHED 0x0001 #define PT_FLAG_CS_DISABLED 0x0004 /* Cancellation disabled */ #define PT_FLAG_CS_ASYNC 0x0008 /* Cancellation is async */ #define PT_FLAG_CS_PENDING 0x0010 #define PT_FLAG_SCOPE_SYSTEM 0x0040 #define PT_FLAG_EXPLICIT_SCHED 0x0080 #define PT_FLAG_SUSPENDED 0x0100 /* In the suspended queue */ #define PT_MAGIC 0x11110001 #define PT_DEAD 0xDEAD0001 #define PT_ATTR_MAGIC 0x22220002 #define PT_ATTR_DEAD 0xDEAD0002 extern size_t pthread__stacksize; extern size_t pthread__guardsize; extern size_t pthread__pagesize; extern int pthread__nspins; extern int pthread__concurrency; extern int pthread__osrev; extern int pthread__unpark_max; extern int pthread_keys_max; extern int __uselibcstub; /* Flag to be used in a ucontext_t's uc_flags indicating that * the saved register state is "user" state only, not full * trap state. */ #define _UC_USER_BIT 30 #define _UC_USER (1LU << _UC_USER_BIT) /* Utility functions */ void pthread__unpark_all(pthread_queue_t *, pthread_t, pthread_mutex_t *) PTHREAD_HIDE; void pthread__unpark(pthread_queue_t *, pthread_t, pthread_mutex_t *) PTHREAD_HIDE; int pthread__park(pthread_t, pthread_mutex_t *, pthread_queue_t *, const struct timespec *, int, const void *) PTHREAD_HIDE; pthread_mutex_t *pthread__hashlock(volatile const void *) PTHREAD_HIDE; /* Internal locking primitives */ void pthread__lockprim_init(void) PTHREAD_HIDE; void pthread_lockinit(pthread_spin_t *) PTHREAD_HIDE; static inline void pthread__spinlock(pthread_t, pthread_spin_t *) __attribute__((__always_inline__)); static inline void pthread__spinlock(pthread_t self, pthread_spin_t *lock) { if (__predict_true((*self->pt_lockops.plo_try)(lock))) return; (*self->pt_lockops.plo_lock)(lock); } static inline int pthread__spintrylock(pthread_t, pthread_spin_t *) __attribute__((__always_inline__)); static inline int pthread__spintrylock(pthread_t self, pthread_spin_t *lock) { return (*self->pt_lockops.plo_try)(lock); } static inline void pthread__spinunlock(pthread_t, pthread_spin_t *) __attribute__((__always_inline__)); static inline void pthread__spinunlock(pthread_t self, pthread_spin_t *lock) { (*self->pt_lockops.plo_unlock)(lock); } extern const struct pthread_lock_ops *pthread__lock_ops; int pthread__simple_locked_p(__cpu_simple_lock_t *) PTHREAD_HIDE; #define pthread__simple_lock_init(alp) (*pthread__lock_ops->plo_init)(alp) #define pthread__simple_lock_try(alp) (*pthread__lock_ops->plo_try)(alp) #define pthread__simple_unlock(alp) (*pthread__lock_ops->plo_unlock)(alp) void pthread__testcancel(pthread_t) PTHREAD_HIDE; int pthread__find(pthread_t) PTHREAD_HIDE; #ifndef PTHREAD_MD_INIT #define PTHREAD_MD_INIT #endif #ifndef _INITCONTEXT_U_MD #define _INITCONTEXT_U_MD(ucp) #endif #define _INITCONTEXT_U(ucp) do { \ (ucp)->uc_flags = _UC_CPU | _UC_STACK; \ _INITCONTEXT_U_MD(ucp) \ } while (/*CONSTCOND*/0) #if !defined(__HAVE_TLS_VARIANT_I) && !defined(__HAVE_TLS_VARIANT_II) #error Either __HAVE_TLS_VARIANT_I or __HAVE_TLS_VARIANT_II must be defined #endif #ifdef _PTHREAD_GETTCB_EXT struct tls_tcb *_PTHREAD_GETTCB_EXT(void); #endif static inline pthread_t __constfunc pthread__self(void) { #if defined(_PTHREAD_GETTCB_EXT) struct tls_tcb * const tcb = _PTHREAD_GETTCB_EXT(); #elif defined(__HAVE___LWP_GETTCB_FAST) struct tls_tcb * const tcb = __lwp_gettcb_fast(); #else struct tls_tcb * const tcb = __lwp_getprivate_fast(); #endif return (pthread_t)tcb->tcb_pthread; } #define pthread__abort() \ pthread__assertfunc(__FILE__, __LINE__, __func__, "unreachable") #define pthread__assert(e) do { \ if (__predict_false(!(e))) \ pthread__assertfunc(__FILE__, __LINE__, __func__, #e); \ } while (/*CONSTCOND*/0) #define pthread__error(err, msg, e) do { \ if (__predict_false(!(e))) { \ pthread__errorfunc(__FILE__, __LINE__, __func__, msg); \ return (err); \ } \ } while (/*CONSTCOND*/0) void *pthread_tsd_init(size_t *) PTHREAD_HIDE; void pthread__destroy_tsd(pthread_t) PTHREAD_HIDE; void pthread__copy_tsd(pthread_t) PTHREAD_HIDE; __dead void pthread__assertfunc(const char *, int, const char *, const char *) PTHREAD_HIDE; void pthread__errorfunc(const char *, int, const char *, const char *) PTHREAD_HIDE; char *pthread__getenv(const char *) PTHREAD_HIDE; __dead void pthread__cancelled(void) PTHREAD_HIDE; void pthread__mutex_deferwake(pthread_t, pthread_mutex_t *) PTHREAD_HIDE; int pthread__checkpri(int) PTHREAD_HIDE; int pthread__add_specific(pthread_t, pthread_key_t, const void *) PTHREAD_HIDE; #ifndef pthread__smt_pause #define pthread__smt_pause() __nothing #endif #ifndef pthread__smt_wait #define pthread__smt_wait() __nothing #endif #ifndef pthread__smt_wake #define pthread__smt_wake() __nothing #endif /* * Bits in the owner field of the lock that indicate lock state. If the * WRITE_LOCKED bit is clear, then the owner field is actually a count of * the number of readers. */ #define RW_HAS_WAITERS 0x01 /* lock has waiters */ #define RW_WRITE_WANTED 0x02 /* >= 1 waiter is a writer */ #define RW_WRITE_LOCKED 0x04 /* lock is currently write locked */ #define RW_UNUSED 0x08 /* currently unused */ #define RW_FLAGMASK 0x0f #define RW_READ_COUNT_SHIFT 4 #define RW_READ_INCR (1 << RW_READ_COUNT_SHIFT) #define RW_THREAD ((uintptr_t)-RW_READ_INCR) #define RW_OWNER(rw) ((rw)->rw_owner & RW_THREAD) #define RW_COUNT(rw) ((rw)->rw_owner & RW_THREAD) #define RW_FLAGS(rw) ((rw)->rw_owner & ~RW_THREAD) #endif /* _LIB_PTHREAD_INT_H */