kc3-lang/gnulib/lib/pthread-mutex.c

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• Hash : 32a72f45
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  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• lib/pthread-mutex.c

• /* POSIX mutexes (locks).
     Copyright (C) 2010-2023 Free Software Foundation, Inc.
  
     This file 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.
  
     This file 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Paul Eggert, 2010, and Bruno Haible <bruno@clisp.org>, 2019.  */
  
  #include <config.h>
  
  /* Specification.  */
  #include <pthread.h>
  
  #if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
  # include "windows-timedmutex.h"
  # include "windows-timedrecmutex.h"
  #else
  # include <stdlib.h>
  #endif
  
  #if ((defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS) || !HAVE_PTHREAD_H
  
  int
  pthread_mutexattr_init (pthread_mutexattr_t *attr)
  {
    *attr = (PTHREAD_MUTEX_STALLED << 2) | PTHREAD_MUTEX_DEFAULT;
    return 0;
  }
  
  int
  pthread_mutexattr_gettype (const pthread_mutexattr_t *attr, int *typep)
  {
    *typep = *attr & (PTHREAD_MUTEX_DEFAULT | PTHREAD_MUTEX_NORMAL
                      | PTHREAD_MUTEX_ERRORCHECK | PTHREAD_MUTEX_RECURSIVE);
    return 0;
  }
  
  int
  pthread_mutexattr_settype (pthread_mutexattr_t *attr, int type)
  {
    if (!(type == PTHREAD_MUTEX_DEFAULT
          || type == PTHREAD_MUTEX_NORMAL
          || type == PTHREAD_MUTEX_ERRORCHECK
          || type == PTHREAD_MUTEX_RECURSIVE))
      return EINVAL;
    *attr ^= (*attr ^ type)
             & (PTHREAD_MUTEX_DEFAULT | PTHREAD_MUTEX_NORMAL
                | PTHREAD_MUTEX_ERRORCHECK | PTHREAD_MUTEX_RECURSIVE);
    return 0;
  }
  
  int
  pthread_mutexattr_getrobust (const pthread_mutexattr_t *attr, int *robustp)
  {
    *robustp = (*attr >> 2) & (PTHREAD_MUTEX_STALLED | PTHREAD_MUTEX_ROBUST);
    return 0;
  }
  
  int
  pthread_mutexattr_setrobust (pthread_mutexattr_t *attr, int robust)
  {
    if (!(robust == PTHREAD_MUTEX_STALLED || robust == PTHREAD_MUTEX_ROBUST))
      return EINVAL;
    *attr ^= (*attr ^ (robust << 2))
             & ((PTHREAD_MUTEX_STALLED | PTHREAD_MUTEX_ROBUST) << 2);
    return 0;
  }
  
  int
  pthread_mutexattr_destroy (_GL_UNUSED pthread_mutexattr_t *attr)
  {
    return 0;
  }
  
  #elif PTHREAD_MUTEXATTR_ROBUST_UNIMPLEMENTED
  
  int
  pthread_mutexattr_getrobust (const pthread_mutexattr_t *attr, int *robustp)
  {
    *robustp = PTHREAD_MUTEX_STALLED;
    return 0;
  }
  
  int
  pthread_mutexattr_setrobust (pthread_mutexattr_t *attr, int robust)
  {
    if (!(robust == PTHREAD_MUTEX_STALLED || robust == PTHREAD_MUTEX_ROBUST))
      return EINVAL;
    if (!(robust == PTHREAD_MUTEX_STALLED))
      return ENOTSUP;
    return 0;
  }
  
  #endif
  
  #if (defined _WIN32 && ! defined __CYGWIN__) && USE_WINDOWS_THREADS
  /* Use Windows threads.  */
  
  int
  pthread_mutex_init (pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
  {
    /* This implementation does not support PTHREAD_MUTEX_ERRORCHECK
       and ignores the 'robust' attribute.  */
    if (attr != NULL
        && (*attr & (PTHREAD_MUTEX_DEFAULT | PTHREAD_MUTEX_NORMAL
                     | PTHREAD_MUTEX_ERRORCHECK | PTHREAD_MUTEX_RECURSIVE))
           == PTHREAD_MUTEX_RECURSIVE)
      {
        mutex->type = 2;
        return glwthread_timedrecmutex_init (&mutex->u.u_timedrecmutex);
      }
    else
      {
        mutex->type = 1;
        return glwthread_timedmutex_init (&mutex->u.u_timedmutex);
      }
  }
  
  int
  pthread_mutex_lock (pthread_mutex_t *mutex)
  {
    switch (mutex->type)
      {
      case 1:
        return glwthread_timedmutex_lock (&mutex->u.u_timedmutex);
      case 2:
        return glwthread_timedrecmutex_lock (&mutex->u.u_timedrecmutex);
      default:
        abort ();
      }
  }
  
  int
  pthread_mutex_trylock (pthread_mutex_t *mutex)
  {
    switch (mutex->type)
      {
      case 1:
        return glwthread_timedmutex_trylock (&mutex->u.u_timedmutex);
      case 2:
        return glwthread_timedrecmutex_trylock (&mutex->u.u_timedrecmutex);
      default:
        abort ();
      }
  }
  
  int
  pthread_mutex_timedlock (pthread_mutex_t *mutex, const struct timespec *abstime)
  {
    switch (mutex->type)
      {
      case 1:
        return glwthread_timedmutex_timedlock (&mutex->u.u_timedmutex, abstime);
      case 2:
        return glwthread_timedrecmutex_timedlock (&mutex->u.u_timedrecmutex,
                                                  abstime);
      default:
        abort ();
      }
  }
  
  int
  pthread_mutex_unlock (pthread_mutex_t *mutex)
  {
    switch (mutex->type)
      {
      case 1:
        return glwthread_timedmutex_unlock (&mutex->u.u_timedmutex);
      case 2:
        return glwthread_timedrecmutex_unlock (&mutex->u.u_timedrecmutex);
      default:
        abort ();
      }
  }
  
  int
  pthread_mutex_destroy (pthread_mutex_t *mutex)
  {
    switch (mutex->type)
      {
      case 1:
        return glwthread_timedmutex_destroy (&mutex->u.u_timedmutex);
      case 2:
        return glwthread_timedrecmutex_destroy (&mutex->u.u_timedrecmutex);
      default:
        abort ();
      }
  }
  
  #elif HAVE_PTHREAD_H
  /* Provide workarounds for POSIX threads.  */
  
  /* pthread_mutex_timedlock is defined by the 'pthread_mutex_timedlock'
     module.  */
  
  #else
  /* Provide a dummy implementation for single-threaded applications.  */
  
  int
  pthread_mutex_init (_GL_UNUSED pthread_mutex_t *mutex,
                      _GL_UNUSED const pthread_mutexattr_t *attr)
  {
    /* MUTEX is never seriously used.  */
    return 0;
  }
  
  int
  pthread_mutex_lock (_GL_UNUSED pthread_mutex_t *mutex)
  {
    /* There is only one thread, so it always gets the lock.  This
       implementation does not support PTHREAD_MUTEX_ERRORCHECK.  */
    return 0;
  }
  
  int
  pthread_mutex_trylock (_GL_UNUSED pthread_mutex_t *mutex)
  {
    /* There is only one thread, so it always gets the lock.  This
       implementation does not support PTHREAD_MUTEX_ERRORCHECK.  */
    return 0;
  }
  
  int
  pthread_mutex_timedlock (_GL_UNUSED pthread_mutex_t *mutex,
                           _GL_UNUSED const struct timespec *abstime)
  {
    /* There is only one thread, so it always gets the lock.  This
       implementation does not support PTHREAD_MUTEX_ERRORCHECK.  */
    return 0;
  }
  
  int
  pthread_mutex_unlock (_GL_UNUSED pthread_mutex_t *mutex)
  {
    /* There is only one thread, so it always unlocks successfully.
       This implementation does not support robust mutexes or
       PTHREAD_MUTEX_ERRORCHECK.  */
    return 0;
  }
  
  int
  pthread_mutex_destroy (_GL_UNUSED pthread_mutex_t *mutex)
  {
    /* MUTEX is never seriously used.  */
    return 0;
  }
  
  #endif
  

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