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sortix--sortix/libpthread/pthread_once.c++
Jonas 'Sortie' Termansen 4d71c96fdc Add pthread_once(3).
2014-07-08 17:41:51 +02:00

42 lines
1.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2014.
This file is part of Sortix libpthread.
Sortix libpthread 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 3 of the License, or (at your
option) any later version.
Sortix libpthread 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 Sortix libpthread. If not, see <http://www.gnu.org/licenses/>.
pthread_once.c++
Dynamic package initialization.
*******************************************************************************/
#include <pthread.h>
extern "C"
int pthread_once(pthread_once_t* once_control, void (*init_routine)(void))
{
pthread_mutex_lock(&once_control->lock);
if ( !once_control->executed )
{
// TODO: If this thread is a cancellation point and is canceled, we must
// pretend this pthread_once was never called. This means that we
// need to ensure that once_control->lock is unlocked in the event
// of a cancellation.
init_routine();
once_control->executed = 1;
}
pthread_mutex_unlock(&once_control->lock);
return 0;
}