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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.                 */

/* Thread creation, initialization, and basic low-level routines */

#include <errno.h>

#include <stddef.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <unistd.h>

#include <fcntl.h>

#include <sys/wait.h>

#include <sys/resource.h>

#include <sys/sysctl.h>

#include <shlib-compat.h>

#include "pthread.h"

#include "internals.h"

#include "spinlock.h"

#include "restart.h"

#include <machine/syscall.h>

/* for threading we use processes so we require a few EL/IX level 2 and

   level 3 syscalls.  We only allow this file to see them to preserve

   the interface. */

#if defined(_ELIX_LEVEL) && _ELIX_LEVEL < 3

static _syscall1_base(int,pipe,int *,filedes)

#endif /* _ELIX_LEVEL < 3 */

#if defined(_ELIX_LEVEL) && _ELIX_LEVEL < 2

static _syscall2_base(int,setrlimit,int,resource,const struct rlimit *,rlp)

int on_exit (void (*fn)(int, void *), void *arg)

{

  register struct _atexit *p;

  void (*x)(void) = (void (*)(void))fn;

/* _REENT_SMALL on_exit() doesn't allow more than the required 32 entries.  */

#ifndef _REENT_SMALL

  if ((p = _REENT->_atexit) == NULL)

    _REENT->_atexit = p = &_REENT->_atexit0;

  if (p->_ind >= _ATEXIT_SIZE)

    {

      if ((p = (struct _atexit *) malloc (sizeof *p)) == NULL)

        return -1;

      p->_ind = 0;

      p->_fntypes = 0;

      p->_next = _REENT->_atexit;

      _REENT->_atexit = p;

    }

#else

  p = &_REENT->_atexit;

  if (p->_ind >= _ATEXIT_SIZE)

    return -1;

#endif

  p->_fntypes |= (1 << p->_ind);

  p->_fnargs[p->_ind] = arg;

  p->_fns[p->_ind++] = x;

  return 0;

}

#endif /* _ELIX_LEVEL < 2 */

/* We need the global/static resolver state here.  */

#include <resolv.h>

#undef _res

/* FIXME: for now, set up _res here */

struct __res_state _res;

/* Sanity check.  */

#if __ASSUME_REALTIME_SIGNALS && !defined __SIGRTMIN

# error "This must not happen; new kernel assumed but old headers"

#endif

/* These variables are used by the setup code.  */

/* Descriptor of the initial thread */

struct _pthread_descr_struct __pthread_initial_thread = {

  {

    {

      &__pthread_initial_thread /* pthread_descr self */

    }

  },

  &__pthread_initial_thread,  /* pthread_descr p_nextlive */

  &__pthread_initial_thread,  /* pthread_descr p_prevlive */

  NULL,                       /* pthread_descr p_nextwaiting */

  NULL,                       /* pthread_descr p_nextlock */

  PTHREAD_THREADS_MAX,        /* pthread_t p_tid */

  0,                          /* int p_pid */

  0,                          /* int p_priority */

  &__pthread_handles[0].h_lock, /* struct _pthread_fastlock * p_lock */

  0,                          /* int p_signal */

  NULL,                       /* sigjmp_buf * p_signal_buf */

  NULL,                       /* sigjmp_buf * p_cancel_buf */

  0,                          /* char p_terminated */

  0,                          /* char p_detached */

  0,                          /* char p_exited */

  NULL,                       /* void * p_retval */

  0,                          /* int p_retval */

  NULL,                       /* pthread_descr p_joining */

  NULL,                       /* struct _pthread_cleanup_buffer * p_cleanup */

  0,                          /* char p_cancelstate */

  0,                          /* char p_canceltype */

  0,                          /* char p_canceled */

  &__pthread_initial_thread.p_reent, /* struct _reent *p_reentp */

  _REENT_INIT(__pthread_initial_thread.p_reent),  /* struct _reent p_reent */

  NULL,                       /* int *p_h_errnop */

  0,                          /* int p_h_errno */

  NULL,                       /* char * p_in_sighandler */

  0,                          /* char p_sigwaiting */

  PTHREAD_START_ARGS_INITIALIZER(NULL),

                              /* struct pthread_start_args p_start_args */

  {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */

  {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */

  1,                          /* int p_userstack */

  NULL,                       /* void * p_guardaddr */

  0,                          /* size_t p_guardsize */

  0,                          /* Always index 0 */

  0,                          /* int p_report_events */

  {{{0, }}, 0, NULL},         /* td_eventbuf_t p_eventbuf */

  __ATOMIC_INITIALIZER,       /* struct pthread_atomic p_resume_count */

  0,                          /* char p_woken_by_cancel */

  0,                          /* char p_condvar_avail */

  0,                          /* char p_sem_avail */

  NULL,                       /* struct pthread_extricate_if *p_extricate */

  NULL,                       /* pthread_readlock_info *p_readlock_list; */

  NULL,                       /* pthread_readlock_info *p_readlock_free; */

};

/* Descriptor of the manager thread; none of this is used but the error

   variables, the p_pid and p_priority fields,

   and the address for identification.  */

struct _pthread_descr_struct __pthread_manager_thread = {

  {

    {

      &__pthread_manager_thread /* pthread_descr self */

    }

  },

  NULL,                       /* pthread_descr p_nextlive */

  NULL,                       /* pthread_descr p_prevlive */

  NULL,                       /* pthread_descr p_nextwaiting */

  NULL,                       /* pthread_descr p_nextlock */

  0,                          /* int p_tid */

  0,                          /* int p_pid */

  0,                          /* int p_priority */

  &__pthread_handles[1].h_lock, /* struct _pthread_fastlock * p_lock */

  0,                          /* int p_signal */

  NULL,                       /* sigjmp_buf * p_signal_buf */

  NULL,                       /* sigjmp_buf * p_cancel_buf */

  0,                          /* char p_terminated */

  0,                          /* char p_detached */

  0,                          /* char p_exited */

  NULL,                       /* void * p_retval */

  0,                          /* int p_retval */

  NULL,                       /* pthread_descr p_joining */

  NULL,                       /* struct _pthread_cleanup_buffer * p_cleanup */

  0,                          /* char p_cancelstate */

  0,                          /* char p_canceltype */

  0,                          /* char p_canceled */

  &__pthread_manager_thread.p_reent, /* struct _reent *p_reentp */

  _REENT_INIT(__pthread_manager_thread.p_reent), /* struct _reent p_reent */

  NULL,                       /* int *p_h_errnop */

  0,                          /* int p_h_errno */

  NULL,                       /* char * p_in_sighandler */

  0,                          /* char p_sigwaiting */

  PTHREAD_START_ARGS_INITIALIZER(__pthread_manager),

                              /* struct pthread_start_args p_start_args */

  {NULL},                     /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */

  {NULL},                     /* void * p_libc_specific[_LIBC_TSD_KEY_N] */

  0,                          /* int p_userstack */

  NULL,                       /* void * p_guardaddr */

  0,                          /* size_t p_guardsize */

  1,                          /* Always index 1 */

  0,                          /* int p_report_events */

  {{{0, }}, 0, NULL},         /* td_eventbuf_t p_eventbuf */

  __ATOMIC_INITIALIZER,       /* struct pthread_atomic p_resume_count */

  0,                          /* char p_woken_by_cancel */

  0,                          /* char p_condvar_avail */

  0,                          /* char p_sem_avail */

  NULL,                       /* struct pthread_extricate_if *p_extricate */

  NULL,                       /* pthread_readlock_info *p_readlock_list; */

  NULL,                       /* pthread_readlock_info *p_readlock_free; */

};

/* Pointer to the main thread (the father of the thread manager thread) */

/* Originally, this is the initial thread, but this changes after fork() */

pthread_descr __pthread_main_thread = &__pthread_initial_thread;

/* Limit between the stack of the initial thread (above) and the

   stacks of other threads (below). Aligned on a STACK_SIZE boundary. */

char *__pthread_initial_thread_bos;

/* File descriptor for sending requests to the thread manager. */

/* Initially -1, meaning that the thread manager is not running. */

int __pthread_manager_request = -1;

/* Other end of the pipe for sending requests to the thread manager. */

int __pthread_manager_reader;

/* Limits of the thread manager stack */

char *__pthread_manager_thread_bos;

char *__pthread_manager_thread_tos;

/* For process-wide exit() */

int __pthread_exit_requested;

int __pthread_exit_code;

/* Maximum stack size.  */

size_t __pthread_max_stacksize;

/* Nozero if the machine has more than one processor.  */

int __pthread_smp_kernel;

#if !__ASSUME_REALTIME_SIGNALS

/* Pointers that select new or old suspend/resume functions

   based on availability of rt signals. */

void (*__pthread_restart)(pthread_descr) = __pthread_restart_old;

void (*__pthread_suspend)(pthread_descr) = __pthread_suspend_old;

int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *) = __pthread_timedsuspend_old;

#endif  /* __ASSUME_REALTIME_SIGNALS */

/* Communicate relevant LinuxThreads constants to gdb */

const int __pthread_threads_max = PTHREAD_THREADS_MAX;

const int __pthread_sizeof_handle = sizeof(struct pthread_handle_struct);

const int __pthread_offsetof_descr = offsetof(struct pthread_handle_struct,

                                              h_descr);

const int __pthread_offsetof_pid = offsetof(struct _pthread_descr_struct,

                                            p_pid);

const int __linuxthreads_pthread_sizeof_descr

  = sizeof(struct _pthread_descr_struct);

/* Forward declarations */

static void pthread_onexit_process(int retcode, void *arg);

#ifndef HAVE_Z_NODELETE

static void pthread_atexit_process(void *arg, int retcode);

static void pthread_atexit_retcode(void *arg, int retcode);

#endif

static void pthread_handle_sigcancel(int sig);

static void pthread_handle_sigrestart(int sig);

static void pthread_handle_sigdebug(int sig);

/* CPU clock handling.  */

#if HP_TIMING_AVAIL

extern hp_timing_t _dl_cpuclock_offset;

#endif

/* Signal numbers used for the communication.

   In these variables we keep track of the used variables.  If the

   platform does not support any real-time signals we will define the

   values to some unreasonable value which will signal failing of all

   the functions below.  */

#ifndef __SIGRTMIN

static int current_rtmin = -1;

static int current_rtmax = -1;

int __pthread_sig_restart = SIGUSR1;

int __pthread_sig_cancel = SIGUSR2;

int __pthread_sig_debug;

#else

static int current_rtmin;

static int current_rtmax;

#if __SIGRTMAX - __SIGRTMIN >= 3

int __pthread_sig_restart = __SIGRTMIN;

int __pthread_sig_cancel = __SIGRTMIN + 1;

int __pthread_sig_debug = __SIGRTMIN + 2;

#else

int __pthread_sig_restart = SIGUSR1;

int __pthread_sig_cancel = SIGUSR2;

int __pthread_sig_debug;

#endif

static int rtsigs_initialized;

#if !__ASSUME_REALTIME_SIGNALS

# include "testrtsig.h"

#endif

static void

init_rtsigs (void)

{

#if !__ASSUME_REALTIME_SIGNALS

  if (__builtin_expect (!kernel_has_rtsig (), 0))

    {

      current_rtmin = -1;

      current_rtmax = -1;

# if __SIGRTMAX - __SIGRTMIN >= 3

      __pthread_sig_restart = SIGUSR1;

      __pthread_sig_cancel = SIGUSR2;

      __pthread_sig_debug = 0;

# endif

    }

  else

#endif  /* __ASSUME_REALTIME_SIGNALS */

    {

#if __SIGRTMAX - __SIGRTMIN >= 3

      current_rtmin = __SIGRTMIN + 3;

# if !__ASSUME_REALTIME_SIGNALS

      __pthread_restart = __pthread_restart_new;

      __pthread_suspend = __pthread_wait_for_restart_signal;

      __pthread_timedsuspend = __pthread_timedsuspend_new;

# endif /* __ASSUME_REALTIME_SIGNALS */

#else

      current_rtmin = __SIGRTMIN;

#endif

      current_rtmax = __SIGRTMAX;

    }

  rtsigs_initialized = 1;

}

#endif

/* Return number of available real-time signal with highest priority.  */

int

__libc_current_sigrtmin (void)

{

#ifdef __SIGRTMIN

  if (__builtin_expect (!rtsigs_initialized, 0))

    init_rtsigs ();

#endif

  return current_rtmin;

}

/* Return number of available real-time signal with lowest priority.  */

int

__libc_current_sigrtmax (void)

{

#ifdef __SIGRTMIN

  if (__builtin_expect (!rtsigs_initialized, 0))

    init_rtsigs ();

#endif

  return current_rtmax;

}

/* Allocate real-time signal with highest/lowest available

   priority.  Please note that we don't use a lock since we assume

   this function to be called at program start.  */

int

__libc_allocate_rtsig (int high)

{

#ifndef __SIGRTMIN

  return -1;

#else

  if (__builtin_expect (!rtsigs_initialized, 0))

    init_rtsigs ();

  if (__builtin_expect (current_rtmin == -1, 0)

      || __builtin_expect (current_rtmin > current_rtmax, 0))

    /* We don't have anymore signal available.  */

    return -1;

  return high ? current_rtmin++ : current_rtmax--;

#endif

}

/* The function we use to get the kernel revision.  */

extern int __sysctl (int *name, int nlen, void *oldval, size_t *oldlenp,

                     void *newval, size_t newlen);

/* Test whether the machine has more than one processor.  This is not the

   best test but good enough.  More complicated tests would require `malloc'

   which is not available at that time.  */

static int

is_smp_system (void)

{

  static const int sysctl_args[] = { CTL_KERN, KERN_VERSION };

  char buf[512];

  size_t reslen = sizeof (buf);

  /* Try reading the number using `sysctl' first.  */

  if (__sysctl ((int *) sysctl_args,

                sizeof (sysctl_args) / sizeof (sysctl_args[0]),

                buf, &reslen, NULL, 0) < 0)

    {

      /* This was not successful.  Now try reading the /proc filesystem.  */

      int fd = __open ("/proc/sys/kernel/version", O_RDONLY);

      if (__builtin_expect (fd, 0) == -1

          || (reslen = __read (fd, buf, sizeof (buf))) <= 0)

        /* This also didn't work.  We give up and say it's a UP machine.  */

        buf[0] = '\0';

      __close (fd);

    }

  return strstr (buf, "SMP") != NULL;

}

/* Initialize the pthread library.

   Initialization is split in two functions:

   - a constructor function that blocks the __pthread_sig_restart signal

     (must do this very early, since the program could capture the signal

      mask with e.g. sigsetjmp before creating the first thread);

   - a regular function called from pthread_create when needed. */

static void pthread_initialize(void) __attribute__((constructor));

#ifndef HAVE_Z_NODELETE

extern void *__dso_handle __attribute__ ((weak));

#endif

/* Do some minimal initialization which has to be done during the

   startup of the C library.  */

void

__pthread_initialize_minimal(void)

{

  /* If we have special thread_self processing, initialize that for the

     main thread now.  */

#ifdef INIT_THREAD_SELF

  INIT_THREAD_SELF(&__pthread_initial_thread, 0);

#endif

#if HP_TIMING_AVAIL

  __pthread_initial_thread.p_cpuclock_offset = _dl_cpuclock_offset;

#endif

}

void

__pthread_init_max_stacksize(void)

{

  struct rlimit limit;

  size_t max_stack;

  getrlimit(RLIMIT_STACK, &limit);

#ifdef FLOATING_STACKS

  if (limit.rlim_cur == RLIM_INFINITY)

    limit.rlim_cur = ARCH_STACK_MAX_SIZE;

# ifdef NEED_SEPARATE_REGISTER_STACK

  max_stack = limit.rlim_cur / 2;

# else

  max_stack = limit.rlim_cur;

# endif

#else

  /* Play with the stack size limit to make sure that no stack ever grows

     beyond STACK_SIZE minus one page (to act as a guard page). */

# ifdef NEED_SEPARATE_REGISTER_STACK

  /* STACK_SIZE bytes hold both the main stack and register backing

     store. The rlimit value applies to each individually.  */

  max_stack = STACK_SIZE/2 - __getpagesize ();

# else

  max_stack = STACK_SIZE - __getpagesize();

# endif

  if (limit.rlim_cur > max_stack) {

    limit.rlim_cur = max_stack;

    __libc_setrlimit(RLIMIT_STACK, &limit);

  }

#endif

  __pthread_max_stacksize = max_stack;

}

static void pthread_initialize(void)

{

  struct sigaction sa;

  sigset_t mask;

  /* If already done (e.g. by a constructor called earlier!), bail out */

  if (__pthread_initial_thread_bos != NULL) return;

#ifdef TEST_FOR_COMPARE_AND_SWAP

  /* Test if compare-and-swap is available */

  __pthread_has_cas = compare_and_swap_is_available();

#endif

#ifdef FLOATING_STACKS

  /* We don't need to know the bottom of the stack.  Give the pointer some

     value to signal that initialization happened.  */

  __pthread_initial_thread_bos = (void *) -1l;

#else

  /* Determine stack size limits .  */

  __pthread_init_max_stacksize ();

# ifdef _STACK_GROWS_UP

  /* The initial thread already has all the stack it needs */

  __pthread_initial_thread_bos = (char *)

    ((long)CURRENT_STACK_FRAME &~ (STACK_SIZE - 1));

# else

  /* For the initial stack, reserve at least STACK_SIZE bytes of stack

     below the current stack address, and align that on a

     STACK_SIZE boundary. */

  __pthread_initial_thread_bos =

    (char *)(((long)CURRENT_STACK_FRAME - 2 * STACK_SIZE) & ~(STACK_SIZE - 1));

# endif

#endif

  /* Update the descriptor for the initial thread. */

  __pthread_initial_thread.p_pid = __getpid();

  /* Likewise for the resolver state _res.  */

  __pthread_initial_thread.p_resp = &_res;

#ifdef __SIGRTMIN

  /* Initialize real-time signals. */

  init_rtsigs ();

#endif

  /* Setup signal handlers for the initial thread.

     Since signal handlers are shared between threads, these settings

     will be inherited by all other threads. */

  sa.sa_handler = pthread_handle_sigrestart;

  sigemptyset(&sa.sa_mask);

  sa.sa_flags = 0;

  __libc_sigaction(__pthread_sig_restart, &sa, NULL);

  sa.sa_handler = pthread_handle_sigcancel;

  // sa.sa_flags = 0;

  __libc_sigaction(__pthread_sig_cancel, &sa, NULL);

  if (__pthread_sig_debug > 0) {

    sa.sa_handler = pthread_handle_sigdebug;

    sigemptyset(&sa.sa_mask);

    // sa.sa_flags = 0;

    __libc_sigaction(__pthread_sig_debug, &sa, NULL);

  }

  /* Initially, block __pthread_sig_restart. Will be unblocked on demand. */

  sigemptyset(&mask);

  sigaddset(&mask, __pthread_sig_restart);

  sigprocmask(SIG_BLOCK, &mask, NULL);

  /* Register an exit function to kill all other threads. */

  /* Do it early so that user-registered atexit functions are called

     before pthread_*exit_process. */

#ifndef HAVE_Z_NODELETE

  if (__builtin_expect (&__dso_handle != NULL, 1))

    __cxa_atexit ((void (*) (void *)) pthread_atexit_process, NULL,

                  __dso_handle);

  else

#endif

    on_exit (pthread_onexit_process, NULL);

  /* How many processors.  */

  __pthread_smp_kernel = is_smp_system ();

}

void __pthread_initialize(void)

{

  pthread_initialize();

}

int __pthread_initialize_manager(void)

{

  int manager_pipe[2];

  int pid;

  struct pthread_request request;

#ifndef HAVE_Z_NODELETE

  if (__builtin_expect (&__dso_handle != NULL, 1))

    __cxa_atexit ((void (*) (void *)) pthread_atexit_retcode, NULL,

                  __dso_handle);

#endif

  if (__pthread_max_stacksize == 0)

    __pthread_init_max_stacksize ();

  /* If basic initialization not done yet (e.g. we're called from a

     constructor run before our constructor), do it now */

  if (__pthread_initial_thread_bos == NULL) pthread_initialize();

  /* Setup stack for thread manager */

  __pthread_manager_thread_bos = malloc(THREAD_MANAGER_STACK_SIZE);

  if (__pthread_manager_thread_bos == NULL) return -1;

  __pthread_manager_thread_tos =

    __pthread_manager_thread_bos + THREAD_MANAGER_STACK_SIZE;

  /* Setup pipe to communicate with thread manager */

  if (__libc_pipe(manager_pipe) == -1) {

    free(__pthread_manager_thread_bos);

    return -1;

  }

  /* Start the thread manager */

  pid = 0;

  if (__builtin_expect (__pthread_initial_thread.p_report_events, 0))

    {

      /* It's a bit more complicated.  We have to report the creation of

         the manager thread.  */

      int idx = __td_eventword (TD_CREATE);

      uint32_t mask = __td_eventmask (TD_CREATE);

      if ((mask & (__pthread_threads_events.event_bits[idx]

                   | __pthread_initial_thread.p_eventbuf.eventmask.event_bits[idx]))

          != 0)

        {

          __pthread_lock(__pthread_manager_thread.p_lock, NULL);

#ifdef NEED_SEPARATE_REGISTER_STACK

          pid = __clone2(__pthread_manager_event,

                         (void **) __pthread_manager_thread_bos,

                         THREAD_MANAGER_STACK_SIZE,

                         CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                         (void *)(long)manager_pipe[0]);

#elif _STACK_GROWS_UP

          pid = __clone(__pthread_manager_event,

                        (void **) __pthread_manager_thread_bos,

                        CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                        (void *)(long)manager_pipe[0]);

#else

          pid = __clone(__pthread_manager_event,

                        (void **) __pthread_manager_thread_tos,

                        CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                        (void *)(long)manager_pipe[0]);

#endif

          if (pid != -1)

            {

              /* Now fill in the information about the new thread in

                 the newly created thread's data structure.  We cannot let

                 the new thread do this since we don't know whether it was

                 already scheduled when we send the event.  */

              __pthread_manager_thread.p_eventbuf.eventdata =

                &__pthread_manager_thread;

              __pthread_manager_thread.p_eventbuf.eventnum = TD_CREATE;

              __pthread_last_event = &__pthread_manager_thread;

              __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1;

              __pthread_manager_thread.p_pid = pid;

              /* Now call the function which signals the event.  */

              __linuxthreads_create_event ();

            }

          /* Now restart the thread.  */

          __pthread_unlock(__pthread_manager_thread.p_lock);

        }

    }

  if (__builtin_expect (pid, 0) == 0)

    {

#ifdef NEED_SEPARATE_REGISTER_STACK

      pid = __clone2(__pthread_manager, (void **) __pthread_manager_thread_bos,

                     THREAD_MANAGER_STACK_SIZE,

                     CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                     (void *)(long)manager_pipe[0]);

#elif _STACK_GROWS_UP

      pid = __clone(__pthread_manager, (void **) __pthread_manager_thread_bos,

                    CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                    (void *)(long)manager_pipe[0]);

#else

      pid = __clone(__pthread_manager, (void **) __pthread_manager_thread_tos,

                    CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,

                    (void *)(long)manager_pipe[0]);

#endif

    }

  if (__builtin_expect (pid, 0) == -1) {

    free(__pthread_manager_thread_bos);

    __libc_close(manager_pipe[0]);

    __libc_close(manager_pipe[1]);

    return -1;

  }

  __pthread_manager_request = manager_pipe[1]; /* writing end */

  __pthread_manager_reader = manager_pipe[0]; /* reading end */

  __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1;

  __pthread_manager_thread.p_pid = pid;

  /* Make gdb aware of new thread manager */

  if (__builtin_expect (__pthread_threads_debug, 0) && __pthread_sig_debug > 0)

    {

      raise(__pthread_sig_debug);

      /* We suspend ourself and gdb will wake us up when it is

         ready to handle us. */

      __pthread_wait_for_restart_signal(thread_self());

    }

  /* Synchronize debugging of the thread manager */

  request.req_kind = REQ_DEBUG;

  TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request,

                                  (char *) &request, sizeof(request)));

  return 0;

}

/* Thread creation */