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Diffstat (limited to 'linuxthreads/descr.h')
| -rw-r--r-- | linuxthreads/descr.h | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/linuxthreads/descr.h b/linuxthreads/descr.h new file mode 100644 index 0000000000..bea8b912f7 --- /dev/null +++ b/linuxthreads/descr.h @@ -0,0 +1,267 @@ +/* Linuxthreads - a simple clone()-based implementation of Posix */ +/* threads for Linux. */ +/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ +/* */ +/* This program is free software; you can redistribute it and/or */ +/* modify it under the terms of the GNU Library General Public License */ +/* as published by the Free Software Foundation; either version 2 */ +/* of the License, or (at your option) any later version. */ +/* */ +/* This program is distributed in the hope that it will be useful, */ +/* but WITHOUT ANY WARRANTY; without even the implied warranty of */ +/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ +/* GNU Library General Public License for more details. */ + +#ifndef _DESCR_H +#define _DESCR_H 1 + +#define __need_res_state +#include <resolv.h> +#include <sched.h> +#include <setjmp.h> +#include <signal.h> +#include <stdint.h> +#include <sys/types.h> +#include <hp-timing.h> +#include <tls.h> + +/* Fast thread-specific data internal to libc. */ +enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0, + _LIBC_TSD_KEY_DL_ERROR, + _LIBC_TSD_KEY_RPC_VARS, + _LIBC_TSD_KEY_LOCALE, + _LIBC_TSD_KEY_CTYPE_B, + _LIBC_TSD_KEY_CTYPE_TOLOWER, + _LIBC_TSD_KEY_CTYPE_TOUPPER, + _LIBC_TSD_KEY_N }; + +/* The type of thread descriptors */ +typedef struct _pthread_descr_struct *pthread_descr; + + +/* Some more includes. */ +#include <pt-machine.h> +#include <linuxthreads_db/thread_dbP.h> + + +/* Arguments passed to thread creation routine */ +struct pthread_start_args { + void *(*start_routine)(void *); /* function to run */ + void *arg; /* its argument */ + sigset_t mask; /* initial signal mask for thread */ + int schedpolicy; /* initial scheduling policy (if any) */ + struct sched_param schedparam; /* initial scheduling parameters (if any) */ +}; + + +/* Callback interface for removing the thread from waiting on an + object if it is cancelled while waiting or about to wait. + This hold a pointer to the object, and a pointer to a function + which ``extricates'' the thread from its enqueued state. + The function takes two arguments: pointer to the wait object, + and a pointer to the thread. It returns 1 if an extrication + actually occured, and hence the thread must also be signalled. + It returns 0 if the thread had already been extricated. */ +typedef struct _pthread_extricate_struct { + void *pu_object; + int (*pu_extricate_func)(void *, pthread_descr); +} pthread_extricate_if; + + +/* Atomic counter made possible by compare_and_swap */ +struct pthread_atomic { + long p_count; + int p_spinlock; +}; + + +/* Context info for read write locks. The pthread_rwlock_info structure + is information about a lock that has been read-locked by the thread + in whose list this structure appears. The pthread_rwlock_context + is embedded in the thread context and contains a pointer to the + head of the list of lock info structures, as well as a count of + read locks that are untracked, because no info structure could be + allocated for them. */ +struct _pthread_rwlock_t; +typedef struct _pthread_rwlock_info { + struct _pthread_rwlock_info *pr_next; + struct _pthread_rwlock_t *pr_lock; + int pr_lock_count; +} pthread_readlock_info; + + +/* We keep thread specific data in a special data structure, a two-level + array. The top-level array contains pointers to dynamically allocated + arrays of a certain number of data pointers. So we can implement a + sparse array. Each dynamic second-level array has + PTHREAD_KEY_2NDLEVEL_SIZE + entries. This value shouldn't be too large. */ +#define PTHREAD_KEY_2NDLEVEL_SIZE 32 + +/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE + keys in each subarray. */ +#define PTHREAD_KEY_1STLEVEL_SIZE \ + ((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \ + / PTHREAD_KEY_2NDLEVEL_SIZE) + + +union dtv; + +struct _pthread_descr_struct +{ +#if !defined USE_TLS || !TLS_DTV_AT_TP + /* This overlaps tcbhead_t (see tls.h), as used for TLS without threads. */ + union + { + struct + { + void *tcb; /* Pointer to the TCB. This is not always + the address of this thread descriptor. */ + union dtv *dtvp; + pthread_descr self; /* Pointer to this structure */ + int multiple_threads; +# ifdef NEED_DL_SYSINFO + uintptr_t sysinfo; +# endif + } data; + void *__padding[16]; + } p_header; +# define p_multiple_threads p_header.data.multiple_threads +#elif TLS_MULTIPLE_THREADS_IN_TCB + int p_multiple_threads; +#endif + + pthread_descr p_nextlive, p_prevlive; + /* Double chaining of active threads */ + pthread_descr p_nextwaiting; /* Next element in the queue holding the thr */ + pthread_descr p_nextlock; /* can be on a queue and waiting on a lock */ + pthread_t p_tid; /* Thread identifier */ + int p_pid; /* PID of Unix process */ + int p_priority; /* Thread priority (== 0 if not realtime) */ + struct _pthread_fastlock * p_lock; /* Spinlock for synchronized accesses */ + int p_signal; /* last signal received */ + sigjmp_buf * p_signal_jmp; /* where to siglongjmp on a signal or NULL */ + sigjmp_buf * p_cancel_jmp; /* where to siglongjmp on a cancel or NULL */ + char p_terminated; /* true if terminated e.g. by pthread_exit */ + char p_detached; /* true if detached */ + char p_exited; /* true if the assoc. process terminated */ + void * p_retval; /* placeholder for return value */ + int p_retcode; /* placeholder for return code */ + pthread_descr p_joining; /* thread joining on that thread or NULL */ + struct _pthread_cleanup_buffer * p_cleanup; /* cleanup functions */ + char p_cancelstate; /* cancellation state */ + char p_canceltype; /* cancellation type (deferred/async) */ + char p_canceled; /* cancellation request pending */ + char * p_in_sighandler; /* stack address of sighandler, or NULL */ + char p_sigwaiting; /* true if a sigwait() is in progress */ + struct pthread_start_args p_start_args; /* arguments for thread creation */ + void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */ +#if !(USE_TLS && HAVE___THREAD) + void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */ + int * p_errnop; /* pointer to used errno variable */ + int p_errno; /* error returned by last system call */ + int * p_h_errnop; /* pointer to used h_errno variable */ + int p_h_errno; /* error returned by last netdb function */ + struct __res_state *p_resp; /* Pointer to resolver state */ +#endif + struct __res_state p_res; /* per-thread resolver state */ + int p_userstack; /* nonzero if the user provided the stack */ + void *p_guardaddr; /* address of guard area or NULL */ + size_t p_guardsize; /* size of guard area */ + int p_nr; /* Index of descriptor in __pthread_handles */ + int p_report_events; /* Nonzero if events must be reported. */ + td_eventbuf_t p_eventbuf; /* Data for event. */ + struct pthread_atomic p_resume_count; /* number of times restart() was + called on thread */ + char p_woken_by_cancel; /* cancellation performed wakeup */ + char p_condvar_avail; /* flag if conditional variable became avail */ + char p_sem_avail; /* flag if semaphore became available */ + pthread_extricate_if *p_extricate; /* See above */ + pthread_readlock_info *p_readlock_list; /* List of readlock info structs */ + pthread_readlock_info *p_readlock_free; /* Free list of structs */ + int p_untracked_readlock_count; /* Readlocks not tracked by list */ + int p_inheritsched; /* copied from the thread attribute */ +#if HP_TIMING_AVAIL + hp_timing_t p_cpuclock_offset; /* Initial CPU clock for thread. */ +#endif +#ifdef USE_TLS + char *p_stackaddr; /* Stack address. */ +#endif + size_t p_alloca_cutoff; /* Maximum size which should be allocated + using alloca() instead of malloc(). */ + /* New elements must be added at the end. */ +} __attribute__ ((aligned(32))); /* We need to align the structure so that + doubles are aligned properly. This is 8 + bytes on MIPS and 16 bytes on MIPS64. + 32 bytes might give better cache + utilization. */ + + + +/* Limit between the stack of the initial thread (above) and the + stacks of other threads (below). Aligned on a STACK_SIZE boundary. + Initially 0, meaning that the current thread is (by definition) + the initial thread. */ + +extern char *__pthread_initial_thread_bos; + +/* Descriptor of the initial thread */ + +extern struct _pthread_descr_struct __pthread_initial_thread; + +/* Limits of the thread manager stack. */ + +extern char *__pthread_manager_thread_bos; +extern char *__pthread_manager_thread_tos; + +/* Descriptor of the manager thread */ + +extern struct _pthread_descr_struct __pthread_manager_thread; +extern pthread_descr __pthread_manager_threadp attribute_hidden; + +/* Indicate whether at least one thread has a user-defined stack (if 1), + or all threads have stacks supplied by LinuxThreads (if 0). */ + +extern int __pthread_nonstandard_stacks; + +/* The max size of the thread stack segments. If the default + THREAD_SELF implementation is used, this must be a power of two and + a multiple of PAGE_SIZE. */ +#ifndef STACK_SIZE +#define STACK_SIZE (2 * 1024 * 1024) +#endif + +/* Get some notion of the current stack. Need not be exactly the top + of the stack, just something somewhere in the current frame. */ +#ifndef CURRENT_STACK_FRAME +#define CURRENT_STACK_FRAME ({ char __csf; &__csf; }) +#endif + +/* Recover thread descriptor for the current thread */ + +extern pthread_descr __pthread_find_self (void) __attribute__ ((const)); + +static inline pthread_descr thread_self (void) __attribute__ ((const)); +static inline pthread_descr thread_self (void) +{ +#ifdef THREAD_SELF + return THREAD_SELF; +#else + char *sp = CURRENT_STACK_FRAME; + if (sp >= __pthread_initial_thread_bos) + return &__pthread_initial_thread; + else if (sp >= __pthread_manager_thread_bos + && sp < __pthread_manager_thread_tos) + return &__pthread_manager_thread; + else if (__pthread_nonstandard_stacks) + return __pthread_find_self(); + else +#ifdef _STACK_GROWS_DOWN + return (pthread_descr)(((unsigned long)sp | (STACK_SIZE-1))+1) - 1; +#else + return (pthread_descr)((unsigned long)sp &~ (STACK_SIZE-1)); +#endif +#endif +} + +#endif /* descr.h */ |