mirror of
https://sourceware.org/git/glibc.git
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410828e47a
2004-12-12 Ulrich Drepper <drepper@redhat.com> * elf/dl-load.c (_dl_map_object_from_fd): Fix computation of mapping start. It must take the actual pagesize into account, not the alignment in the file.
551 lines
20 KiB
C
551 lines
20 KiB
C
/* Linuxthreads - a simple clone()-based implementation of Posix */
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/* threads for Linux. */
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/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
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/* */
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/* This program is free software; you can redistribute it and/or */
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/* modify it under the terms of the GNU Library General Public License */
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/* as published by the Free Software Foundation; either version 2 */
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/* of the License, or (at your option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, */
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/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
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/* GNU Library General Public License for more details. */
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#ifndef _INTERNALS_H
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#define _INTERNALS_H 1
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/* Internal data structures */
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/* Includes */
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#include <limits.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <stackinfo.h>
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#include <sigcontextinfo.h>
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#include <tls.h>
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#include "descr.h"
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#include "semaphore.h"
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#include <pthread-functions.h>
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#ifndef THREAD_GETMEM
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# define THREAD_GETMEM(descr, member) descr->member
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#endif
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#ifndef THREAD_GETMEM_NC
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# define THREAD_GETMEM_NC(descr, member) descr->member
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#endif
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#ifndef THREAD_SETMEM
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# define THREAD_SETMEM(descr, member, value) descr->member = (value)
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#endif
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#ifndef THREAD_SETMEM_NC
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# define THREAD_SETMEM_NC(descr, member, value) descr->member = (value)
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#endif
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#if !defined NOT_IN_libc && defined FLOATING_STACKS
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# define LIBC_THREAD_GETMEM(descr, member) THREAD_GETMEM (descr, member)
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# define LIBC_THREAD_SETMEM(descr, member, value) \
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THREAD_SETMEM (descr, member, value)
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#else
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# define LIBC_THREAD_GETMEM(descr, member) descr->member
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# define LIBC_THREAD_SETMEM(descr, member, value) descr->member = (value)
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#endif
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typedef void (*destr_function)(void *);
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struct pthread_key_struct {
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int in_use; /* already allocated? */
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destr_function destr; /* destruction routine */
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};
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#define PTHREAD_START_ARGS_INITIALIZER(fct) \
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{ (void *(*) (void *)) fct, NULL, {{0, }}, 0, { 0 } }
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/* The type of thread handles. */
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typedef struct pthread_handle_struct * pthread_handle;
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struct pthread_handle_struct {
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struct _pthread_fastlock h_lock; /* Fast lock for sychronized access */
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pthread_descr h_descr; /* Thread descriptor or NULL if invalid */
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char * h_bottom; /* Lowest address in the stack thread */
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};
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/* The type of messages sent to the thread manager thread */
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struct pthread_request {
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pthread_descr req_thread; /* Thread doing the request */
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enum { /* Request kind */
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REQ_CREATE, REQ_FREE, REQ_PROCESS_EXIT, REQ_MAIN_THREAD_EXIT,
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REQ_POST, REQ_DEBUG, REQ_KICK, REQ_FOR_EACH_THREAD
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} req_kind;
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union { /* Arguments for request */
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struct { /* For REQ_CREATE: */
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const pthread_attr_t * attr; /* thread attributes */
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void * (*fn)(void *); /* start function */
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void * arg; /* argument to start function */
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sigset_t mask; /* signal mask */
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} create;
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struct { /* For REQ_FREE: */
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pthread_t thread_id; /* identifier of thread to free */
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} free;
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struct { /* For REQ_PROCESS_EXIT: */
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int code; /* exit status */
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} exit;
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void * post; /* For REQ_POST: the semaphore */
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struct { /* For REQ_FOR_EACH_THREAD: callback */
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void (*fn)(void *, pthread_descr);
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void *arg;
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} for_each;
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} req_args;
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};
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typedef void (*arch_sighandler_t) (int, SIGCONTEXT);
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union sighandler
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{
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arch_sighandler_t old;
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void (*rt) (int, struct siginfo *, struct ucontext *);
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};
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extern union sighandler __sighandler[NSIG];
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/* Signals used for suspend/restart and for cancellation notification. */
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extern int __pthread_sig_restart;
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extern int __pthread_sig_cancel;
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/* Signal used for interfacing with gdb */
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extern int __pthread_sig_debug;
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/* Global array of thread handles, used for validating a thread id
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and retrieving the corresponding thread descriptor. Also used for
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mapping the available stack segments. */
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extern struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX];
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/* Descriptor of the main thread */
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extern pthread_descr __pthread_main_thread;
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/* File descriptor for sending requests to the thread manager.
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Initially -1, meaning that __pthread_initialize_manager must be called. */
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extern int __pthread_manager_request;
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/* Other end of the pipe for sending requests to the thread manager. */
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extern int __pthread_manager_reader;
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#ifdef FLOATING_STACKS
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/* Maximum stack size. */
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extern size_t __pthread_max_stacksize;
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#endif
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/* Pending request for a process-wide exit */
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extern int __pthread_exit_requested, __pthread_exit_code;
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/* Set to 1 by gdb if we're debugging */
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extern volatile int __pthread_threads_debug;
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/* Globally enabled events. */
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extern volatile td_thr_events_t __pthread_threads_events;
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/* Pointer to descriptor of thread with last event. */
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extern volatile pthread_descr __pthread_last_event;
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/* Flag which tells whether we are executing on SMP kernel. */
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extern int __pthread_smp_kernel;
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/* Return the handle corresponding to a thread id */
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static inline pthread_handle thread_handle(pthread_t id)
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{
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return &__pthread_handles[id % PTHREAD_THREADS_MAX];
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}
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/* Validate a thread handle. Must have acquired h->h_spinlock before. */
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static inline int invalid_handle(pthread_handle h, pthread_t id)
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{
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return h->h_descr == NULL || h->h_descr->p_tid != id || h->h_descr->p_terminated;
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}
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static inline int nonexisting_handle(pthread_handle h, pthread_t id)
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{
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return h->h_descr == NULL || h->h_descr->p_tid != id;
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}
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/* Fill in defaults left unspecified by pt-machine.h. */
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/* We round up a value with page size. */
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#ifndef page_roundup
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#define page_roundup(v,p) ((((size_t) (v)) + (p) - 1) & ~((p) - 1))
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#endif
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/* The page size we can get from the system. This should likely not be
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changed by the machine file but, you never know. */
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#ifndef PAGE_SIZE
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#define PAGE_SIZE (sysconf (_SC_PAGE_SIZE))
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#endif
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/* The initial size of the thread stack. Must be a multiple of PAGE_SIZE. */
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#ifndef INITIAL_STACK_SIZE
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#define INITIAL_STACK_SIZE (4 * PAGE_SIZE)
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#endif
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/* Size of the thread manager stack. The "- 32" avoids wasting space
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with some malloc() implementations. */
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#ifndef THREAD_MANAGER_STACK_SIZE
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#define THREAD_MANAGER_STACK_SIZE (2 * PAGE_SIZE - 32)
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#endif
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/* The base of the "array" of thread stacks. The array will grow down from
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here. Defaults to the calculated bottom of the initial application
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stack. */
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#ifndef THREAD_STACK_START_ADDRESS
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#define THREAD_STACK_START_ADDRESS __pthread_initial_thread_bos
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#endif
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/* If MEMORY_BARRIER isn't defined in pt-machine.h, assume the
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architecture doesn't need a memory barrier instruction (e.g. Intel
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x86). Still we need the compiler to respect the barrier and emit
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all outstanding operations which modify memory. Some architectures
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distinguish between full, read and write barriers. */
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#ifndef MEMORY_BARRIER
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#define MEMORY_BARRIER() asm ("" : : : "memory")
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#endif
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#ifndef READ_MEMORY_BARRIER
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#define READ_MEMORY_BARRIER() MEMORY_BARRIER()
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#endif
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#ifndef WRITE_MEMORY_BARRIER
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#define WRITE_MEMORY_BARRIER() MEMORY_BARRIER()
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#endif
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/* Max number of times we must spin on a spinlock calling sched_yield().
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After MAX_SPIN_COUNT iterations, we put the calling thread to sleep. */
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#ifndef MAX_SPIN_COUNT
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#define MAX_SPIN_COUNT 50
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#endif
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/* Max number of times the spinlock in the adaptive mutex implementation
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spins actively on SMP systems. */
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#ifndef MAX_ADAPTIVE_SPIN_COUNT
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#define MAX_ADAPTIVE_SPIN_COUNT 100
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#endif
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/* Duration of sleep (in nanoseconds) when we can't acquire a spinlock
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after MAX_SPIN_COUNT iterations of sched_yield().
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With the 2.0 and 2.1 kernels, this MUST BE > 2ms.
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(Otherwise the kernel does busy-waiting for realtime threads,
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giving other threads no chance to run.) */
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#ifndef SPIN_SLEEP_DURATION
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#define SPIN_SLEEP_DURATION 2000001
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#endif
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/* Defined and used in libc.so. */
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extern int __libc_multiple_threads attribute_hidden;
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extern int __librt_multiple_threads;
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/* Debugging */
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#ifdef DEBUG
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#include <assert.h>
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#define ASSERT assert
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#define MSG __pthread_message
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#else
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#define ASSERT(x)
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#define MSG(msg,arg...)
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#endif
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/* Internal global functions */
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extern void __pthread_do_exit (void *retval, char *currentframe)
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__attribute__ ((__noreturn__));
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extern void __pthread_destroy_specifics (void);
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extern void __pthread_perform_cleanup (char *currentframe);
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extern void __pthread_init_max_stacksize (void);
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extern int __pthread_initialize_manager (void);
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extern void __pthread_message (const char * fmt, ...);
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extern int __pthread_manager (void *reqfd);
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extern int __pthread_manager_event (void *reqfd);
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extern void __pthread_manager_sighandler (int sig);
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extern void __pthread_reset_main_thread (void);
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extern void __pthread_once_fork_prepare (void);
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extern void __pthread_once_fork_parent (void);
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extern void __pthread_once_fork_child (void);
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extern void __flockfilelist (void);
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extern void __funlockfilelist (void);
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extern void __fresetlockfiles (void);
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extern void __pthread_manager_adjust_prio (int thread_prio);
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extern void __pthread_initialize_minimal (void);
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extern int __pthread_attr_setguardsize (pthread_attr_t *__attr,
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size_t __guardsize);
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extern int __pthread_attr_getguardsize (const pthread_attr_t *__attr,
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size_t *__guardsize);
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extern int __pthread_attr_setstackaddr (pthread_attr_t *__attr,
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void *__stackaddr);
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extern int __pthread_attr_getstackaddr (const pthread_attr_t *__attr,
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void **__stackaddr);
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extern int __pthread_attr_setstacksize (pthread_attr_t *__attr,
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size_t __stacksize);
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extern int __pthread_attr_getstacksize (const pthread_attr_t *__attr,
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size_t *__stacksize);
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extern int __pthread_attr_setstack (pthread_attr_t *__attr, void *__stackaddr,
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size_t __stacksize);
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extern int __pthread_attr_getstack (const pthread_attr_t *__attr, void **__stackaddr,
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size_t *__stacksize);
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extern int __pthread_attr_destroy (pthread_attr_t *attr);
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extern int __pthread_attr_setdetachstate (pthread_attr_t *attr,
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int detachstate);
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extern int __pthread_attr_getdetachstate (const pthread_attr_t *attr,
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int *detachstate);
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extern int __pthread_attr_setschedparam (pthread_attr_t *attr,
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const struct sched_param *param);
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extern int __pthread_attr_getschedparam (const pthread_attr_t *attr,
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struct sched_param *param);
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extern int __pthread_attr_setschedpolicy (pthread_attr_t *attr, int policy);
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extern int __pthread_attr_getschedpolicy (const pthread_attr_t *attr,
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int *policy);
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extern int __pthread_attr_setinheritsched (pthread_attr_t *attr, int inherit);
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extern int __pthread_attr_getinheritsched (const pthread_attr_t *attr,
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int *inherit);
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extern int __pthread_attr_setscope (pthread_attr_t *attr, int scope);
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extern int __pthread_attr_getscope (const pthread_attr_t *attr, int *scope);
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extern int __pthread_getconcurrency (void);
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extern int __pthread_setconcurrency (int __level);
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extern int __pthread_mutex_timedlock (pthread_mutex_t *__mutex,
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const struct timespec *__abstime);
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extern int __pthread_mutexattr_getpshared (const pthread_mutexattr_t *__attr,
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int *__pshared);
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extern int __pthread_mutexattr_setpshared (pthread_mutexattr_t *__attr,
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int __pshared);
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extern int __pthread_mutexattr_gettype (const pthread_mutexattr_t *__attr,
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int *__kind);
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extern void __pthread_kill_other_threads_np (void);
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extern int __pthread_mutex_init (pthread_mutex_t *__mutex,
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__const pthread_mutexattr_t *__mutex_attr);
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extern int __pthread_mutex_destroy (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_lock (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_trylock (pthread_mutex_t *__mutex);
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extern int __pthread_mutex_unlock (pthread_mutex_t *__mutex);
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#if defined NOT_IN_libc && defined IS_IN_libpthread
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hidden_proto (__pthread_mutex_init)
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hidden_proto (__pthread_mutex_destroy)
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hidden_proto (__pthread_mutex_lock)
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hidden_proto (__pthread_mutex_trylock)
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hidden_proto (__pthread_mutex_unlock)
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#endif
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extern int __pthread_cond_init (pthread_cond_t *cond,
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const pthread_condattr_t *cond_attr);
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extern int __pthread_cond_destroy (pthread_cond_t *cond);
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extern int __pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex);
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extern int __pthread_cond_timedwait (pthread_cond_t *cond,
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pthread_mutex_t *mutex,
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const struct timespec *abstime);
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extern int __pthread_cond_signal (pthread_cond_t *cond);
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extern int __pthread_cond_broadcast (pthread_cond_t *cond);
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extern int __pthread_condattr_init (pthread_condattr_t *attr);
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extern int __pthread_condattr_destroy (pthread_condattr_t *attr);
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extern pthread_t __pthread_self (void);
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extern pthread_descr __pthread_thread_self (void);
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extern pthread_descr __pthread_self_stack (void) attribute_hidden;
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extern int __pthread_equal (pthread_t thread1, pthread_t thread2);
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extern void __pthread_exit (void *retval);
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extern int __pthread_getschedparam (pthread_t thread, int *policy,
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struct sched_param *param);
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extern int __pthread_setschedparam (pthread_t thread, int policy,
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const struct sched_param *param);
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extern int __pthread_setcancelstate (int state, int * oldstate);
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extern int __pthread_setcanceltype (int type, int * oldtype);
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extern void __pthread_restart_old(pthread_descr th);
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extern void __pthread_suspend_old(pthread_descr self);
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extern int __pthread_timedsuspend_old(pthread_descr self, const struct timespec *abs);
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extern void __pthread_restart_new(pthread_descr th);
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extern void __pthread_suspend_new(pthread_descr self);
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extern int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abs);
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extern void __pthread_wait_for_restart_signal(pthread_descr self);
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extern void __pthread_sigsuspend (const sigset_t *mask) attribute_hidden;
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extern int __pthread_yield (void);
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extern int __pthread_rwlock_timedrdlock (pthread_rwlock_t *__restrict __rwlock,
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__const struct timespec *__restrict
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__abstime);
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extern int __pthread_rwlock_timedwrlock (pthread_rwlock_t *__restrict __rwlock,
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__const struct timespec *__restrict
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__abstime);
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extern int __pthread_rwlockattr_destroy (pthread_rwlockattr_t *__attr);
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extern int __pthread_barrierattr_getpshared (__const pthread_barrierattr_t *
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__restrict __attr,
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int *__restrict __pshared);
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extern int __pthread_spin_lock (pthread_spinlock_t *__lock);
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extern int __pthread_spin_trylock (pthread_spinlock_t *__lock);
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extern int __pthread_spin_unlock (pthread_spinlock_t *__lock);
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extern int __pthread_spin_init (pthread_spinlock_t *__lock, int __pshared);
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extern int __pthread_spin_destroy (pthread_spinlock_t *__lock);
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/* Global pointers to old or new suspend functions */
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extern void (*__pthread_restart)(pthread_descr);
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extern void (*__pthread_suspend)(pthread_descr);
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extern int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *);
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/* Prototypes for the function without cancelation support when the
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normal version has it. */
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extern int __libc_close (int fd);
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extern int __libc_nanosleep (const struct timespec *requested_time,
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struct timespec *remaining);
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/* Prototypes for some of the new semaphore functions. */
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extern int __new_sem_post (sem_t * sem);
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extern int __new_sem_init (sem_t *__sem, int __pshared, unsigned int __value);
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extern int __new_sem_wait (sem_t *__sem);
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extern int __new_sem_trywait (sem_t *__sem);
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extern int __new_sem_getvalue (sem_t *__restrict __sem, int *__restrict __sval);
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extern int __new_sem_destroy (sem_t *__sem);
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/* Prototypes for compatibility functions. */
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extern int __pthread_attr_init_2_1 (pthread_attr_t *__attr);
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extern int __pthread_attr_init_2_0 (pthread_attr_t *__attr);
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extern int __pthread_create_2_1 (pthread_t *__restrict __threadp,
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const pthread_attr_t *__attr,
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void *(*__start_routine) (void *),
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void *__restrict __arg);
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extern int __pthread_create_2_0 (pthread_t *__restrict thread,
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const pthread_attr_t *__attr,
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void *(*__start_routine) (void *),
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void *__restrict arg);
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/* The functions called the signal events. */
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extern void __linuxthreads_create_event (void);
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extern void __linuxthreads_death_event (void);
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extern void __linuxthreads_reap_event (void);
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/* This function is called to initialize the pthread library. */
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extern void __pthread_initialize (void);
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/* TSD. */
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extern int __pthread_internal_tsd_set (int key, const void * pointer);
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extern void * __pthread_internal_tsd_get (int key);
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extern void ** __attribute__ ((__const__))
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__pthread_internal_tsd_address (int key);
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/* Sighandler wrappers. */
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extern void __pthread_sighandler(int signo, SIGCONTEXT ctx);
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extern void __pthread_sighandler_rt(int signo, struct siginfo *si,
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struct ucontext *uc);
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extern void __pthread_null_sighandler(int sig);
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extern int __pthread_sigaction (int sig, const struct sigaction *act,
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struct sigaction *oact);
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extern int __pthread_sigwait (const sigset_t *set, int *sig);
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extern int __pthread_raise (int sig);
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/* Cancellation. */
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extern int __pthread_enable_asynccancel (void) attribute_hidden;
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extern void __pthread_disable_asynccancel (int oldtype)
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internal_function attribute_hidden;
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/* The two functions are in libc.so and not exported. */
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extern int __libc_enable_asynccancel (void) attribute_hidden;
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extern void __libc_disable_asynccancel (int oldtype)
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internal_function attribute_hidden;
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/* The two functions are in libc.so and are exported. */
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extern int __librt_enable_asynccancel (void);
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extern void __librt_disable_asynccancel (int oldtype) internal_function;
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extern void __pthread_cleanup_upto (__jmp_buf target,
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char *targetframe) attribute_hidden;
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extern pid_t __pthread_fork (struct fork_block *b) attribute_hidden;
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#if !defined NOT_IN_libc
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# define LIBC_CANCEL_ASYNC() \
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__libc_enable_asynccancel ()
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# define LIBC_CANCEL_RESET(oldtype) \
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__libc_disable_asynccancel (oldtype)
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# define LIBC_CANCEL_HANDLED() \
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__asm (".globl " __SYMBOL_PREFIX "__libc_enable_asynccancel"); \
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__asm (".globl " __SYMBOL_PREFIX "__libc_disable_asynccancel")
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#elif defined IS_IN_libpthread
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# define LIBC_CANCEL_ASYNC() \
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__pthread_enable_asynccancel ()
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# define LIBC_CANCEL_RESET(oldtype) \
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__pthread_disable_asynccancel (oldtype)
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# define LIBC_CANCEL_HANDLED() \
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__asm (".globl " __SYMBOL_PREFIX "__pthread_enable_asynccancel"); \
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__asm (".globl " __SYMBOL_PREFIX "__pthread_disable_asynccancel")
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#elif defined IS_IN_librt
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# define LIBC_CANCEL_ASYNC() \
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__librt_enable_asynccancel ()
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# define LIBC_CANCEL_RESET(oldtype) \
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__librt_disable_asynccancel (oldtype)
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|
# define LIBC_CANCEL_HANDLED() \
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__asm (".globl " __SYMBOL_PREFIX "__librt_enable_asynccancel"); \
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__asm (".globl " __SYMBOL_PREFIX "__librt_disable_asynccancel")
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#else
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# define LIBC_CANCEL_ASYNC() 0 /* Just a dummy value. */
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# define LIBC_CANCEL_RESET(val) ((void)(val)) /* Nothing, but evaluate it. */
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# define LIBC_CANCEL_HANDLED() /* Nothing. */
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#endif
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extern int * __libc_pthread_init (const struct pthread_functions *functions);
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|
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#if !defined NOT_IN_libc && !defined FLOATING_STACKS
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|
# ifdef SHARED
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# define thread_self() \
|
|
(*__libc_pthread_functions.ptr_pthread_thread_self) ()
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# else
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|
weak_extern (__pthread_thread_self)
|
|
# define thread_self() __pthread_thread_self ()
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef USE_TLS
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|
# define __manager_thread (&__pthread_manager_thread)
|
|
#else
|
|
# define __manager_thread __pthread_manager_threadp
|
|
#endif
|
|
|
|
extern inline __attribute__((always_inline)) pthread_descr
|
|
check_thread_self (void)
|
|
{
|
|
pthread_descr self = thread_self ();
|
|
#if defined THREAD_SELF && defined INIT_THREAD_SELF
|
|
if (self == __manager_thread)
|
|
{
|
|
/* A new thread might get a cancel signal before it is fully
|
|
initialized, so that the thread register might still point to the
|
|
manager thread. Double check that this is really the manager
|
|
thread. */
|
|
self = __pthread_self_stack();
|
|
if (self != __manager_thread)
|
|
/* Oops, thread_self() isn't working yet.. */
|
|
INIT_THREAD_SELF(self, self->p_nr);
|
|
}
|
|
#endif
|
|
return self;
|
|
}
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|
|
|
#endif /* internals.h */
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