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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _DESCR_H
#define _DESCR_H 1
#include <limits.h>
#include <sched.h>
#include <setjmp.h>
#include <stdbool.h>
#include <sys/types.h>
#include <hp-timing.h>
#include <list.h>
#include <lowlevellock.h>
#include <pthreaddef.h>
#include <dl-sysdep.h>
#include "../nptl_db/thread_db.h"
#include <tls.h>
#ifndef TCB_ALIGNMENT
# define TCB_ALIGNMENT sizeof (double)
#endif
/* 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)
/* Thread descriptor data structure. */
struct pthread
{
#if !TLS_DTV_AT_TP
/* This overlaps tcbhead_t (see tls.h), as used for TLS without threads. */
union
{
tcbhead_t;
void *__padding[16];
};
#elif TLS_MULTIPLE_THREADS_IN_TCB
int multiple_threads;
#endif
/* This descriptor's link on the `stack_used' or `__stack_user' list. */
list_t list;
/* Thread ID - which is also a 'is this thread descriptor (and
therefore stack) used' flag. */
pid_t tid;
/* List of cleanup buffers. */
struct _pthread_cleanup_buffer *cleanup;
/* Two-level array for the thread-specific data. */
struct pthread_key_data
{
/* Sequence number. We use uintptr_t to not require padding on
32- and 64-bit machines. On 64-bit machines it helps to avoid
wrapping, too. */
uintptr_t seq;
/* Data pointer. */
void *data;
} *specific[PTHREAD_KEY_1STLEVEL_SIZE];
/* We allocate one block of references here. This should be enough
to avoid allocating any memory dynamically for most applications. */
struct pthread_key_data specific_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
/* Flag which is set when specific data is set. */
bool specific_used;
/* True if the user provided the stack. */
bool user_stack;
/* True if events must be reported. */
bool report_events;
/* Lock to syncronize access to the descriptor. */
lll_lock_t lock;
#if HP_TIMING_AVAIL
/* Offset of the CPU clock at start thread start time. */
hp_timing_t cpuclock_offset;
#endif
/* If the thread waits to join another one the ID of the latter is
stored here.
In case a thread is detached this field contains a pointer of the
TCB if the thread itself. This is something which cannot happen
in normal operation. */
struct pthread *joinid;
/* Check whether a thread is detached. */
#define IS_DETACHED(pd) ((pd)->joinid == (pd))
/* Flags determining processing of cancellation. */
int cancelhandling;
/* Bit set if cancellation is disabled. */
#define CANCELSTATE_BIT 0
#define CANCELSTATE_BITMASK 0x01
/* Bit set if asynchronous cancellation mode is selected. */
#define CANCELTYPE_BIT 1
#define CANCELTYPE_BITMASK 0x02
/* Bit set if canceling has been initiated. */
#define CANCELING_BIT 2
#define CANCELING_BITMASK 0x04
/* Bit set if canceled. */
#define CANCELED_BIT 3
#define CANCELED_BITMASK 0x08
/* Bit set if thread is exiting. */
#define EXITING_BIT 4
#define EXITING_BITMASK 0x10
/* Bit set if thread terminated and TCB is freed. */
#define TERMINATED_BIT 5
#define TERMINATED_BITMASK 0x20
/* Mask for the rest. Helps the compiler to optimize. */
#define CANCEL_RESTMASK 0xffffffc0
#define CANCEL_ENABLED_AND_CANCELED(value) \
(((value) & (CANCELSTATE_BITMASK | CANCELED_BITMASK | EXITING_BITMASK \
| CANCEL_RESTMASK | TERMINATED_BITMASK)) == CANCELED_BITMASK)
#define CANCEL_ENABLED_AND_CANCELED_AND_ASYNCHRONOUS(value) \
(((value) & (CANCELSTATE_BITMASK | CANCELTYPE_BITMASK | CANCELED_BITMASK \
| EXITING_BITMASK | CANCEL_RESTMASK | TERMINATED_BITMASK)) \
== (CANCELTYPE_BITMASK | CANCELED_BITMASK))
/* Setjmp buffer to be used if try/finally is not available. */
sigjmp_buf cancelbuf;
#define HAVE_CANCELBUF 1
/* Flags. Including those copied from the thread attribute. */
int flags;
/* The result of the thread function. */
void *result;
/* Scheduling parameters for the new thread. */
struct sched_param schedparam;
int schedpolicy;
/* Start position of the code to be executed and the argument passed
to the function. */
void *(*start_routine) (void *);
void *arg;
/* Debug state. */
td_eventbuf_t eventbuf;
/* Next descriptor with a pending event. */
struct pthread *nextevent;
/* If nonzero pointer to area allocated for the stack and its
size. */
void *stackblock;
size_t stackblock_size;
/* Size of the included guard area. */
size_t guardsize;
} __attribute ((aligned (TCB_ALIGNMENT)));
#endif /* descr.h */
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