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+/* 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 <sys/types.h>
+#include <hp-timing.h>
+#include <bits/libc-tsd.h> /* for _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 {
+ /* XXX Remove this union for IA-64 style TLS module */
+ union {
+ struct {
+ pthread_descr self; /* Pointer to this structure */
+ union dtv *dtvp;
+ } data;
+ void *__padding[16];
+ } p_header;
+ 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 */
+ 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 */
+ 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 */
+ void * p_libc_specific[_LIBC_TSD_KEY_N]; /* thread-specific data for libc */
+ 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 */
+ struct __res_state *p_resp; /* Pointer to resolver state */
+ struct __res_state p_res; /* per-thread resolver state */
+ int p_inheritsched; /* copied from the thread attribute */
+#if HP_TIMING_AVAIL
+ hp_timing_t p_cpuclock_offset; /* Initial CPU clock for thread. */
+#endif
+ /* 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. */
+
+#endif /* descr.h */