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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-specific data */

#include <errno.h>

#include <stddef.h>

#include <stdlib.h>

#include "pthread.h"

#include "internals.h"

#include "spinlock.h"

#include "restart.h"

#include <bits/libc-lock.h>

/* Table of keys. */

static struct pthread_key_struct pthread_keys[PTHREAD_KEYS_MAX] =

  { { 0, NULL } };

/* For debugging purposes put the maximum number of keys in a variable.  */

const int __linuxthreads_pthread_keys_max = PTHREAD_KEYS_MAX;

const int __linuxthreads_pthread_key_2ndlevel_size = PTHREAD_KEY_2NDLEVEL_SIZE;

/* Mutex to protect access to pthread_keys */

static pthread_mutex_t pthread_keys_mutex = PTHREAD_MUTEX_INITIALIZER;

/* Create a new key */

int __pthread_key_create(pthread_key_t * key, destr_function destr)

{

  int i;

  pthread_mutex_lock(&pthread_keys_mutex);

  for (i = 0; i < PTHREAD_KEYS_MAX; i++) {

    if (! pthread_keys[i].in_use) {

      /* Mark key in use */

      pthread_keys[i].in_use = 1;

      pthread_keys[i].destr = destr;

      pthread_mutex_unlock(&pthread_keys_mutex);

      *key = i;

      return 0;

    }

  }

  pthread_mutex_unlock(&pthread_keys_mutex);

  return EAGAIN;

}

strong_alias (__pthread_key_create, pthread_key_create)

/* Reset deleted key's value to NULL in each live thread.

 * NOTE: this executes in the context of the thread manager! */

struct pthread_key_delete_helper_args {

  /* Damn, we need lexical closures in C! ;) */

  unsigned int idx1st, idx2nd;

  pthread_descr self;

};

static void pthread_key_delete_helper(void *arg, pthread_descr th)

{

  struct pthread_key_delete_helper_args *args = arg;

  unsigned int idx1st = args->idx1st;

  unsigned int idx2nd = args->idx2nd;

  pthread_descr self = args->self;

  if (self == 0)

    self = args->self = thread_self();

  if (!th->p_terminated) {

    /* pthread_exit() may try to free th->p_specific[idx1st] concurrently. */

    __pthread_lock(THREAD_GETMEM(th, p_lock), self);

    if (th->p_specific[idx1st] != NULL)

      th->p_specific[idx1st][idx2nd] = NULL;

    __pthread_unlock(THREAD_GETMEM(th, p_lock));

  }

}

/* Delete a key */

int pthread_key_delete(pthread_key_t key)

{

  pthread_descr self = thread_self();

  pthread_mutex_lock(&pthread_keys_mutex);

  if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use) {

    pthread_mutex_unlock(&pthread_keys_mutex);

    return EINVAL;

  }

  pthread_keys[key].in_use = 0;

  pthread_keys[key].destr = NULL;

  /* Set the value of the key to NULL in all running threads, so

     that if the key is reallocated later by pthread_key_create, its

     associated values will be NULL in all threads.

     Do nothing if no threads have been created yet.  */

  if (__pthread_manager_request != -1)

    {

      struct pthread_key_delete_helper_args args;

      struct pthread_request request;

      args.idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;

      args.idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;

      args.self = 0;

      request.req_thread = self;

      request.req_kind = REQ_FOR_EACH_THREAD;

      request.req_args.for_each.arg = &args;

      request.req_args.for_each.fn = pthread_key_delete_helper;

      TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request,

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

      suspend(self);

    }

  pthread_mutex_unlock(&pthread_keys_mutex);

  return 0;

}

/* Set the value of a key */

int __pthread_setspecific(pthread_key_t key, const void * pointer)

{

  pthread_descr self = thread_self();

  unsigned int idx1st, idx2nd;

  if (key >= PTHREAD_KEYS_MAX || !pthread_keys[key].in_use)

    return EINVAL;

  idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;

  idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;

  if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL) {

    void *newp = calloc(PTHREAD_KEY_2NDLEVEL_SIZE, sizeof (void *));

    if (newp == NULL)

      return ENOMEM;

    THREAD_SETMEM_NC(self, p_specific[idx1st], newp);

  }

  THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd] = (void *) pointer;

  return 0;

}

strong_alias (__pthread_setspecific, pthread_setspecific)

/* Get the value of a key */

void * __pthread_getspecific(pthread_key_t key)

{

  pthread_descr self = thread_self();

  unsigned int idx1st, idx2nd;

  if (key >= PTHREAD_KEYS_MAX)

    return NULL;

  idx1st = key / PTHREAD_KEY_2NDLEVEL_SIZE;

  idx2nd = key % PTHREAD_KEY_2NDLEVEL_SIZE;

  if (THREAD_GETMEM_NC(self, p_specific[idx1st]) == NULL

      || !pthread_keys[key].in_use)

    return NULL;

  return THREAD_GETMEM_NC(self, p_specific[idx1st])[idx2nd];

}

strong_alias (__pthread_getspecific, pthread_getspecific)

/* Call the destruction routines on all keys */

void __pthread_destroy_specifics()

{

  pthread_descr self = thread_self();

  int i, j, round, found_nonzero;

  destr_function destr;

  void * data;

  for (round = 0, found_nonzero = 1;

       found_nonzero && round < PTHREAD_DESTRUCTOR_ITERATIONS;

       round++) {

    found_nonzero = 0;

    for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++)

      if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL)

        for (j = 0; j < PTHREAD_KEY_2NDLEVEL_SIZE; j++) {

          destr = pthread_keys[i * PTHREAD_KEY_2NDLEVEL_SIZE + j].destr;

          data = THREAD_GETMEM_NC(self, p_specific[i])[j];

          if (destr != NULL && data != NULL) {

            THREAD_GETMEM_NC(self, p_specific[i])[j] = NULL;

            destr(data);

            found_nonzero = 1;

          }

        }

  }

  __pthread_lock(THREAD_GETMEM(self, p_lock), self);

  for (i = 0; i < PTHREAD_KEY_1STLEVEL_SIZE; i++) {

    if (THREAD_GETMEM_NC(self, p_specific[i]) != NULL) {

      free(THREAD_GETMEM_NC(self, p_specific[i]));

      THREAD_SETMEM_NC(self, p_specific[i], NULL);

    }

  }

  __pthread_unlock(THREAD_GETMEM(self, p_lock));

}

/* Thread-specific data for libc. */

static int

libc_internal_tsd_set(enum __libc_tsd_key_t key, const void * pointer)

{

  pthread_descr self = thread_self();

  THREAD_SETMEM_NC(self, p_libc_specific[key], (void *) pointer);

  return 0;

}

int (*__libc_internal_tsd_set)(enum __libc_tsd_key_t key, const void * pointer)

     = libc_internal_tsd_set;

static void *

libc_internal_tsd_get(enum __libc_tsd_key_t key)

{

  pthread_descr self = thread_self();

  return THREAD_GETMEM_NC(self, p_libc_specific[key]);

}

void * (*__libc_internal_tsd_get)(enum __libc_tsd_key_t key)

     = libc_internal_tsd_get;