?? pt-mutex-unlock.c
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/* Unlock a mutex. Generic version. Copyright (C) 2000,02 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library 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. The GNU C Library 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. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */#include <pthread.h>#include <pt-internal.h>#define LOSE do { * (int *) 0 = 0; } while (1)/* Unlock MUTEX, rescheduling a waiting thread. */int__pthread_mutex_unlock (pthread_mutex_t *mutex){ struct __pthread *wakeup; __pthread_spin_lock (&mutex->__lock); if (mutex->attr) switch (mutex->attr->mutex_type) { case PTHREAD_MUTEX_NORMAL: break; case PTHREAD_MUTEX_ERRORCHECK: case PTHREAD_MUTEX_RECURSIVE: if (mutex->owner != _pthread_self ()) { __pthread_spin_unlock (&mutex->__lock); return EPERM; } if (mutex->attr->mutex_type == PTHREAD_MUTEX_RECURSIVE) if (--mutex->locks > 0) { __pthread_spin_unlock (&mutex->__lock); return 0; } mutex->owner = 0; break; default: LOSE; } if (mutex->__queue == NULL) { __pthread_spin_unlock (&mutex->__held); __pthread_spin_unlock (&mutex->__lock); return 0; } wakeup = mutex->__queue; __pthread_dequeue (wakeup); /* We do not unlock MUTEX->held: we are transferring the ownership to the thread that we are waking up. */ __pthread_spin_unlock (&mutex->__lock); __pthread_wakeup (wakeup); return 0;}weak_alias (__pthread_mutex_unlock, _pthread_mutex_unlock);weak_alias (__pthread_mutex_unlock, pthread_mutex_unlock);
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