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319 lines
9.6 KiB
C
319 lines
9.6 KiB
C
/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _DESCR_H
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#define _DESCR_H 1
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#include <limits.h>
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#include <sched.h>
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#include <setjmp.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <hp-timing.h>
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#include <list.h>
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#include <lowlevellock.h>
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#include <pthreaddef.h>
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#include <dl-sysdep.h>
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#include "../nptl_db/thread_db.h"
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#include <tls.h>
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#ifdef HAVE_FORCED_UNWIND
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# include <unwind.h>
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#endif
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#define __need_res_state
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#include <resolv.h>
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#ifndef TCB_ALIGNMENT
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# define TCB_ALIGNMENT sizeof (double)
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#endif
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/* We keep thread specific data in a special data structure, a two-level
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array. The top-level array contains pointers to dynamically allocated
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arrays of a certain number of data pointers. So we can implement a
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sparse array. Each dynamic second-level array has
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PTHREAD_KEY_2NDLEVEL_SIZE
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entries. This value shouldn't be too large. */
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#define PTHREAD_KEY_2NDLEVEL_SIZE 32
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/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
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keys in each subarray. */
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#define PTHREAD_KEY_1STLEVEL_SIZE \
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((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
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/ PTHREAD_KEY_2NDLEVEL_SIZE)
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/* Internal version of the buffer to store cancellation handler
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information. */
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struct pthread_unwind_buf
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{
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struct
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{
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__jmp_buf jmp_buf;
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int mask_was_saved;
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} cancel_jmp_buf[1];
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union
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{
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/* This is the placeholder of the public version. */
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void *pad[4];
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struct
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{
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/* Pointer to the previous cleanup buffer. */
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struct pthread_unwind_buf *prev;
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/* Backward compatibility: state of the old-style cleanup
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handler at the time of the previous new-style cleanup handler
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installment. */
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struct _pthread_cleanup_buffer *cleanup;
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/* Cancellation type before the push call. */
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int canceltype;
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} data;
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} priv;
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};
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/* Opcodes and data types for communication with the signal handler to
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change user/group IDs. */
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struct xid_command
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{
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int syscall_no;
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long id[3];
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volatile int cntr;
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};
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/* Thread descriptor data structure. */
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struct pthread
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{
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union
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{
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#if !TLS_DTV_AT_TP
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/* This overlaps the TCB as used for TLS without threads (see tls.h). */
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tcbhead_t header;
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#else
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struct
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{
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int multiple_threads;
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} header;
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#endif
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/* This extra padding has no special purpose, and this structure layout
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is private and subject to change without affecting the official ABI.
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We just have it here in case it might be convenient for some
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implementation-specific instrumentation hack or suchlike. */
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void *__padding[16];
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};
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/* This descriptor's link on the `stack_used' or `__stack_user' list. */
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list_t list;
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/* Thread ID - which is also a 'is this thread descriptor (and
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therefore stack) used' flag. */
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pid_t tid;
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/* Process ID - thread group ID in kernel speak. */
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pid_t pid;
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/* List of robust mutexes the thread is holding. */
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struct __pthread_mutex_s *robust_list;
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#ifdef __PTHREAD_MUTEX_HAVE_PREV
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# define ENQUEUE_MUTEX(mutex) \
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do { \
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mutex->__data.__next = THREAD_GETMEM (THREAD_SELF, robust_list); \
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THREAD_SETMEM (THREAD_SELF, robust_list, &mutex->__data); \
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if (mutex->__data.__next != NULL) \
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mutex->__data.__next->__prev = &mutex->__data; \
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mutex->__data.__prev = NULL; \
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} while (0)
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# define DEQUEUE_MUTEX(mutex) \
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do { \
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if (mutex->__data.__prev == NULL) \
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THREAD_SETMEM (THREAD_SELF, robust_list, mutex->__data.__next); \
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else \
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mutex->__data.__prev->__next = mutex->__data.__next; \
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if (mutex->__data.__next != NULL) \
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mutex->__data.__next->__prev = mutex->__data.__prev; \
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mutex->__data.__prev = NULL; \
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mutex->__data.__next = NULL; \
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} while (0)
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#else
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# define ENQUEUE_MUTEX(mutex) \
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do { \
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mutex->__data.__next = THREAD_GETMEM (THREAD_SELF, robust_list); \
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THREAD_SETMEM (THREAD_SELF, robust_list, &mutex->__data); \
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} while (0)
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# define DEQUEUE_MUTEX(mutex) \
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do { \
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struct pthread_mutex_s *runp = THREAD_GETMEM (THREAD_SELF, robust_list); \
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if (runp == &mutex->__data) \
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THREAD_SETMEM (THREAD_SELF, robust_list, runp->__next); \
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else \
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{ \
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while (runp->__next != &mutex->__data) \
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runp = runp->__next; \
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\
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runp->__next = runp->__next->__next; \
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mutex->__data.__next = NULL; \
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} \
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} while (0)
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#endif
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/* List of cleanup buffers. */
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struct _pthread_cleanup_buffer *cleanup;
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/* Unwind information. */
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struct pthread_unwind_buf *cleanup_jmp_buf;
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#define HAVE_CLEANUP_JMP_BUF
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/* Flags determining processing of cancellation. */
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int cancelhandling;
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/* Bit set if cancellation is disabled. */
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#define CANCELSTATE_BIT 0
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#define CANCELSTATE_BITMASK 0x01
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/* Bit set if asynchronous cancellation mode is selected. */
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#define CANCELTYPE_BIT 1
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#define CANCELTYPE_BITMASK 0x02
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/* Bit set if canceling has been initiated. */
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#define CANCELING_BIT 2
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#define CANCELING_BITMASK 0x04
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/* Bit set if canceled. */
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#define CANCELED_BIT 3
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#define CANCELED_BITMASK 0x08
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/* Bit set if thread is exiting. */
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#define EXITING_BIT 4
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#define EXITING_BITMASK 0x10
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/* Bit set if thread terminated and TCB is freed. */
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#define TERMINATED_BIT 5
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#define TERMINATED_BITMASK 0x20
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/* Bit set if thread is supposed to change XID. */
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#define SETXID_BIT 6
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#define SETXID_BITMASK 0x40
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/* Mask for the rest. Helps the compiler to optimize. */
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#define CANCEL_RESTMASK 0xffffff80
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#define CANCEL_ENABLED_AND_CANCELED(value) \
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(((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK \
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| CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
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#define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
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(((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK \
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| EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK)) \
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== (CANCELTYPE_BITMASK | CANCELED_BITMASK))
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/* We allocate one block of references here. This should be enough
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to avoid allocating any memory dynamically for most applications. */
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struct pthread_key_data
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{
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/* Sequence number. We use uintptr_t to not require padding on
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32- and 64-bit machines. On 64-bit machines it helps to avoid
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wrapping, too. */
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uintptr_t seq;
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/* Data pointer. */
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void *data;
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} specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
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/* Two-level array for the thread-specific data. */
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struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE];
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/* Flag which is set when specific data is set. */
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bool specific_used;
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/* True if events must be reported. */
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bool report_events;
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/* True if the user provided the stack. */
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bool user_stack;
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/* True if thread must stop at startup time. */
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bool stopped_start;
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/* Lock to synchronize access to the descriptor. */
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lll_lock_t lock;
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/* Lock for synchronizing setxid calls. */
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lll_lock_t setxid_futex;
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#if HP_TIMING_AVAIL
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/* Offset of the CPU clock at start thread start time. */
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hp_timing_t cpuclock_offset;
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#endif
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/* If the thread waits to join another one the ID of the latter is
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stored here.
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In case a thread is detached this field contains a pointer of the
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TCB if the thread itself. This is something which cannot happen
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in normal operation. */
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struct pthread *joinid;
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/* Check whether a thread is detached. */
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#define IS_DETACHED(pd) ((pd)->joinid == (pd))
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/* Flags. Including those copied from the thread attribute. */
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int flags;
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/* The result of the thread function. */
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void *result;
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/* Scheduling parameters for the new thread. */
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struct sched_param schedparam;
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int schedpolicy;
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/* Start position of the code to be executed and the argument passed
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to the function. */
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void *(*start_routine) (void *);
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void *arg;
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/* Debug state. */
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td_eventbuf_t eventbuf;
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/* Next descriptor with a pending event. */
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struct pthread *nextevent;
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#ifdef HAVE_FORCED_UNWIND
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/* Machine-specific unwind info. */
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struct _Unwind_Exception exc;
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#endif
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/* If nonzero pointer to area allocated for the stack and its
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size. */
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void *stackblock;
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size_t stackblock_size;
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/* Size of the included guard area. */
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size_t guardsize;
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/* This is what the user specified and what we will report. */
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size_t reported_guardsize;
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/* Resolver state. */
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struct __res_state res;
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/* If you add fields after the res field above, please adjust
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the following macro. */
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#define PTHREAD_STRUCT_END_PADDING \
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(sizeof (struct pthread) - offsetof (struct pthread, res) \
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- sizeof (((struct pthread *) 0)->res))
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} __attribute ((aligned (TCB_ALIGNMENT)));
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#endif /* descr.h */
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