261 lines
7.5 KiB
C
261 lines
7.5 KiB
C
/* Copyright (C) 2002, 2003, 2004 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>
|
|
#ifdef HAVE_FORCED_UNWIND
|
|
# include <unwind.h>
|
|
#endif
|
|
#define __need_res_state
|
|
#include <resolv.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)
|
|
|
|
|
|
|
|
|
|
/* Internal version of the buffer to store cancellation handler
|
|
information. */
|
|
struct pthread_unwind_buf
|
|
{
|
|
struct
|
|
{
|
|
__jmp_buf jmp_buf;
|
|
int mask_was_saved;
|
|
} cancel_jmp_buf[1];
|
|
|
|
union
|
|
{
|
|
/* This is the placeholder of the public version. */
|
|
void *pad[4];
|
|
|
|
struct
|
|
{
|
|
/* Pointer to the previous cleanup buffer. */
|
|
struct pthread_unwind_buf *prev;
|
|
|
|
/* Backward compatibility: state of the old-style cleanup
|
|
handler at the time of the previous new-style cleanup handler
|
|
installment. */
|
|
struct _pthread_cleanup_buffer *cleanup;
|
|
|
|
/* Cancellation type before the push call. */
|
|
int canceltype;
|
|
} data;
|
|
} priv;
|
|
};
|
|
|
|
|
|
/* Opcodes and data types for communication with the signal handler to
|
|
change user/group IDs. */
|
|
struct xid_command
|
|
{
|
|
int syscall_no;
|
|
long id[3];
|
|
volatile int cntr;
|
|
};
|
|
|
|
|
|
/* Thread descriptor data structure. */
|
|
struct pthread
|
|
{
|
|
union
|
|
{
|
|
#if !TLS_DTV_AT_TP
|
|
/* This overlaps the TCB as used for TLS without threads (see tls.h). */
|
|
tcbhead_t header;
|
|
#else
|
|
struct
|
|
{
|
|
int multiple_threads;
|
|
} header;
|
|
#endif
|
|
|
|
/* This extra padding has no special purpose, and this structure layout
|
|
is private and subject to change without affecting the official ABI.
|
|
We just have it here in case it might be convenient for some
|
|
implementation-specific instrumentation hack or suchlike. */
|
|
void *__padding[16];
|
|
};
|
|
|
|
/* 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;
|
|
|
|
/* Process ID - thread group ID in kernel speak. */
|
|
pid_t pid;
|
|
|
|
/* List of cleanup buffers. */
|
|
struct _pthread_cleanup_buffer *cleanup;
|
|
|
|
/* Unwind information. */
|
|
struct pthread_unwind_buf *cleanup_jmp_buf;
|
|
#define HAVE_CLEANUP_JMP_BUF
|
|
|
|
/* 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))
|
|
|
|
/* We allocate one block of references here. This should be enough
|
|
to avoid allocating any memory dynamically for most applications. */
|
|
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_1stblock[PTHREAD_KEY_2NDLEVEL_SIZE];
|
|
|
|
/* Flag which is set when specific data is set. */
|
|
bool specific_used;
|
|
|
|
/* Two-level array for the thread-specific data. */
|
|
struct pthread_key_data *specific[PTHREAD_KEY_1STLEVEL_SIZE];
|
|
|
|
/* True if events must be reported. */
|
|
bool report_events;
|
|
|
|
/* True if the user provided the stack. */
|
|
bool user_stack;
|
|
|
|
/* True if thread must stop at startup time. */
|
|
bool stopped_start;
|
|
|
|
/* Lock to synchronize 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. 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;
|
|
|
|
#ifdef HAVE_FORCED_UNWIND
|
|
/* Machine-specific unwind info. */
|
|
struct _Unwind_Exception exc;
|
|
#endif
|
|
|
|
/* 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;
|
|
/* This is what the user specified and what we will report. */
|
|
size_t reported_guardsize;
|
|
|
|
/* Resolver state. */
|
|
struct __res_state res;
|
|
} __attribute ((aligned (TCB_ALIGNMENT)));
|
|
|
|
|
|
#endif /* descr.h */
|