[thirdparty/glibc.git] / linuxthreads / descr.h

/* 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 */
Commit	Line	Data
535b764d UD	1	/* Linuxthreads - a simple clone()-based implementation of Posix */
	2	/* threads for Linux. */
	3	/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
	4	/* */
	5	/* This program is free software; you can redistribute it and/or */
	6	/* modify it under the terms of the GNU Library General Public License */
	7	/* as published by the Free Software Foundation; either version 2 */
	8	/* of the License, or (at your option) any later version. */
	9	/* */
	10	/* This program is distributed in the hope that it will be useful, */
	11	/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
	12	/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
	13	/* GNU Library General Public License for more details. */
	14
	15	#ifndef _DESCR_H
	16	#define _DESCR_H 1
	17
	18	#define __need_res_state
	19	#include <resolv.h>
	20	#include <sched.h>
	21	#include <setjmp.h>
	22	#include <signal.h>
131fd126	23	#include <stdint.h>
535b764d UD	24	#include <sys/types.h>
535b764d UD	25	#include <hp-timing.h>
bb0ddc2f	26	#include <tls.h>
535b764d	27
270d9d47 UD	28	/* Fast thread-specific data internal to libc. */
	29	enum __libc_tsd_key_t { _LIBC_TSD_KEY_MALLOC = 0,
	30	_LIBC_TSD_KEY_DL_ERROR,
	31	_LIBC_TSD_KEY_RPC_VARS,
	32	_LIBC_TSD_KEY_LOCALE,
	33	_LIBC_TSD_KEY_CTYPE_B,
	34	_LIBC_TSD_KEY_CTYPE_TOLOWER,
	35	_LIBC_TSD_KEY_CTYPE_TOUPPER,
	36	_LIBC_TSD_KEY_N };
535b764d UD	37
	38	/* The type of thread descriptors */
	39	typedef struct _pthread_descr_struct *pthread_descr;
	40
	41
	42	/* Some more includes. */
	43	#include <pt-machine.h>
	44	#include <linuxthreads_db/thread_dbP.h>
	45
	46
	47	/* Arguments passed to thread creation routine */
	48	struct pthread_start_args {
	49	void (start_routine)(void ); / function to run */
	50	void arg; / its argument */
	51	sigset_t mask; /* initial signal mask for thread */
	52	int schedpolicy; /* initial scheduling policy (if any) */
	53	struct sched_param schedparam; /* initial scheduling parameters (if any) */
	54	};
	55
	56
	57	/* Callback interface for removing the thread from waiting on an
	58	object if it is cancelled while waiting or about to wait.
	59	This hold a pointer to the object, and a pointer to a function
	60	which ``extricates'' the thread from its enqueued state.
	61	The function takes two arguments: pointer to the wait object,
	62	and a pointer to the thread. It returns 1 if an extrication
	63	actually occured, and hence the thread must also be signalled.
	64	It returns 0 if the thread had already been extricated. */
	65	typedef struct _pthread_extricate_struct {
	66	void *pu_object;
	67	int (pu_extricate_func)(void , pthread_descr);
	68	} pthread_extricate_if;
	69
	70
	71	/* Atomic counter made possible by compare_and_swap */
	72	struct pthread_atomic {
	73	long p_count;
	74	int p_spinlock;
	75	};
	76
	77
	78	/* Context info for read write locks. The pthread_rwlock_info structure
	79	is information about a lock that has been read-locked by the thread
	80	in whose list this structure appears. The pthread_rwlock_context
	81	is embedded in the thread context and contains a pointer to the
	82	head of the list of lock info structures, as well as a count of
	83	read locks that are untracked, because no info structure could be
	84	allocated for them. */
	85	struct _pthread_rwlock_t;
	86	typedef struct _pthread_rwlock_info {
	87	struct _pthread_rwlock_info *pr_next;
	88	struct _pthread_rwlock_t *pr_lock;
	89	int pr_lock_count;
	90	} pthread_readlock_info;
	91
	92
	93	/* We keep thread specific data in a special data structure, a two-level
	94	array. The top-level array contains pointers to dynamically allocated
	95	arrays of a certain number of data pointers. So we can implement a
	96	sparse array. Each dynamic second-level array has
	97	PTHREAD_KEY_2NDLEVEL_SIZE
	98	entries. This value shouldn't be too large. */
	99	#define PTHREAD_KEY_2NDLEVEL_SIZE 32
	100
101	/* We need to address PTHREAD_KEYS_MAX key with PTHREAD_KEY_2NDLEVEL_SIZE
102	keys in each subarray. */
103	#define PTHREAD_KEY_1STLEVEL_SIZE \
104	((PTHREAD_KEYS_MAX + PTHREAD_KEY_2NDLEVEL_SIZE - 1) \
105	/ PTHREAD_KEY_2NDLEVEL_SIZE)
106
107
108	union dtv;
109
bb0ddc2f RM	110	struct _pthread_descr_struct
	111	{
	112	#if !defined USE_TLS \|\| !TLS_DTV_AT_TP
	113	/* This overlaps tcbhead_t (see tls.h), as used for TLS without threads. */
	114	union
	115	{
	116	struct
	117	{
557fab43 UD	118	void tcb; / Pointer to the TCB. This is not always
557fab43 UD	119	the address of this thread descriptor. */
535b764d	120	union dtv *dtvp;
557fab43	121	pthread_descr self; /* Pointer to this structure */
82f81a90	122	int multiple_threads;
299601a1	123	# ifdef NEED_DL_SYSINFO
131fd126	124	uintptr_t sysinfo;
299601a1	125	# endif
535b764d UD	126	} data;
	127	void *__padding[16];
	128	} p_header;
c86e6aec UD	129	# define p_multiple_threads p_header.data.multiple_threads
	130	#elif TLS_MULTIPLE_THREADS_IN_TCB
	131	int p_multiple_threads;
bb0ddc2f	132	#endif
c86e6aec	133
535b764d UD	134	pthread_descr p_nextlive, p_prevlive;
	135	/* Double chaining of active threads */
	136	pthread_descr p_nextwaiting; /* Next element in the queue holding the thr */
	137	pthread_descr p_nextlock; /* can be on a queue and waiting on a lock */
	138	pthread_t p_tid; /* Thread identifier */
	139	int p_pid; /* PID of Unix process */
	140	int p_priority; /* Thread priority (== 0 if not realtime) */
	141	struct _pthread_fastlock * p_lock; /* Spinlock for synchronized accesses */
	142	int p_signal; /* last signal received */
	143	sigjmp_buf * p_signal_jmp; /* where to siglongjmp on a signal or NULL */
	144	sigjmp_buf * p_cancel_jmp; /* where to siglongjmp on a cancel or NULL */
	145	char p_terminated; /* true if terminated e.g. by pthread_exit */
	146	char p_detached; /* true if detached */
	147	char p_exited; /* true if the assoc. process terminated */
	148	void * p_retval; /* placeholder for return value */
	149	int p_retcode; /* placeholder for return code */
	150	pthread_descr p_joining; /* thread joining on that thread or NULL */
	151	struct _pthread_cleanup_buffer * p_cleanup; /* cleanup functions */
	152	char p_cancelstate; /* cancellation state */
	153	char p_canceltype; /* cancellation type (deferred/async) */
	154	char p_canceled; /* cancellation request pending */
535b764d UD	155	char * p_in_sighandler; /* stack address of sighandler, or NULL */
	156	char p_sigwaiting; /* true if a sigwait() is in progress */
	157	struct pthread_start_args p_start_args; /* arguments for thread creation */
	158	void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE]; /* thread-specific data */
c2afe833	159	#if !(USE_TLS && HAVE___THREAD)
535b764d	160	void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */
c2afe833 RM	161	int * p_errnop; /* pointer to used errno variable */
	162	int p_errno; /* error returned by last system call */
	163	int * p_h_errnop; /* pointer to used h_errno variable */
	164	int p_h_errno; /* error returned by last netdb function */
	165	struct __res_state p_resp; / Pointer to resolver state */
c2afe833	166	#endif
0e9d6240	167	struct __res_state p_res; /* per-thread resolver state */
535b764d UD	168	int p_userstack; /* nonzero if the user provided the stack */
	169	void p_guardaddr; / address of guard area or NULL */
	170	size_t p_guardsize; /* size of guard area */
	171	int p_nr; /* Index of descriptor in __pthread_handles */
	172	int p_report_events; /* Nonzero if events must be reported. */
	173	td_eventbuf_t p_eventbuf; /* Data for event. */
	174	struct pthread_atomic p_resume_count; /* number of times restart() was
	175	called on thread */
	176	char p_woken_by_cancel; /* cancellation performed wakeup */
	177	char p_condvar_avail; /* flag if conditional variable became avail */
	178	char p_sem_avail; /* flag if semaphore became available */
	179	pthread_extricate_if p_extricate; / See above */
	180	pthread_readlock_info p_readlock_list; / List of readlock info structs */
	181	pthread_readlock_info p_readlock_free; / Free list of structs */
	182	int p_untracked_readlock_count; /* Readlocks not tracked by list */
535b764d UD	183	int p_inheritsched; /* copied from the thread attribute */
	184	#if HP_TIMING_AVAIL
	185	hp_timing_t p_cpuclock_offset; /* Initial CPU clock for thread. */
557fab43 UD	186	#endif
	187	#ifdef USE_TLS
	188	char p_stackaddr; / Stack address. */
535b764d	189	#endif
6166815d UD	190	size_t p_alloca_cutoff; /* Maximum size which should be allocated
6166815d UD	191	using alloca() instead of malloc(). */
c86e6aec	192	/* New elements must be added at the end. */
535b764d UD	193	} __attribute__ ((aligned(32))); /* We need to align the structure so that
	194	doubles are aligned properly. This is 8
	195	bytes on MIPS and 16 bytes on MIPS64.
	196	32 bytes might give better cache
	197	utilization. */
	198
cd30b01e UD	199
	200
	201	/* Limit between the stack of the initial thread (above) and the
	202	stacks of other threads (below). Aligned on a STACK_SIZE boundary.
	203	Initially 0, meaning that the current thread is (by definition)
	204	the initial thread. */
	205
	206	extern char *__pthread_initial_thread_bos;
	207
	208	/* Descriptor of the initial thread */
	209
	210	extern struct _pthread_descr_struct __pthread_initial_thread;
	211
	212	/* Limits of the thread manager stack. */
	213
	214	extern char *__pthread_manager_thread_bos;
	215	extern char *__pthread_manager_thread_tos;
	216
	217	/* Descriptor of the manager thread */
	218
	219	extern struct _pthread_descr_struct __pthread_manager_thread;
65af7e61	220	extern pthread_descr __pthread_manager_threadp attribute_hidden;
cd30b01e UD	221
	222	/* Indicate whether at least one thread has a user-defined stack (if 1),
	223	or all threads have stacks supplied by LinuxThreads (if 0). */
	224
	225	extern int __pthread_nonstandard_stacks;
	226
	227	/* The max size of the thread stack segments. If the default
	228	THREAD_SELF implementation is used, this must be a power of two and
	229	a multiple of PAGE_SIZE. */
	230	#ifndef STACK_SIZE
	231	#define STACK_SIZE (2 * 1024 * 1024)
	232	#endif
	233
	234	/* Get some notion of the current stack. Need not be exactly the top
	235	of the stack, just something somewhere in the current frame. */
	236	#ifndef CURRENT_STACK_FRAME
	237	#define CURRENT_STACK_FRAME ({ char __csf; &__csf; })
	238	#endif
	239
	240	/* Recover thread descriptor for the current thread */
	241
	242	extern pthread_descr __pthread_find_self (void) __attribute__ ((const));
	243
	244	static inline pthread_descr thread_self (void) __attribute__ ((const));
	245	static inline pthread_descr thread_self (void)
	246	{
	247	#ifdef THREAD_SELF
	248	return THREAD_SELF;
	249	#else
	250	char *sp = CURRENT_STACK_FRAME;
	251	if (sp >= __pthread_initial_thread_bos)
	252	return &__pthread_initial_thread;
	253	else if (sp >= __pthread_manager_thread_bos
	254	&& sp < __pthread_manager_thread_tos)
	255	return &__pthread_manager_thread;
	256	else if (__pthread_nonstandard_stacks)
	257	return __pthread_find_self();
	258	else
	259	#ifdef _STACK_GROWS_DOWN
	260	return (pthread_descr)(((unsigned long)sp \| (STACK_SIZE-1))+1) - 1;
	261	#else
	262	return (pthread_descr)((unsigned long)sp &~ (STACK_SIZE-1));
	263	#endif
	264	#endif
	265	}
	266
535b764d	267	#endif /* descr.h */