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Add pthread_once(3).

This commit is contained in:
Jonas 'Sortie' Termansen 2014-01-10 16:01:28 +01:00
parent 12dcfd7b47
commit 4d71c96fdc
4 changed files with 59 additions and 3 deletions
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1
libpthread/Makefile
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@ -36,6 +36,7 @@ pthread_mutex_init.o \
pthread_mutex_lock.o \
pthread_mutex_trylock.o \
pthread_mutex_unlock.o \
pthread_once.o \
pthread_rwlock_destroy.o \
pthread_rwlock_init.o \
pthread_rwlock_rdlock.o \

14
libpthread/include/__/pthread.h
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@ -99,7 +99,19 @@ typedef struct
} __pthread_mutexattr_t;
#endif
typedef int __pthread_once_t;
#if defined(__is_sortix_libpthread)
typedef struct
{
__pthread_mutex_t lock;
int executed;
} __pthread_once_t;
#else
typedef struct
{
__pthread_mutex_t __pthread_lock;
int __pthread_executed;
} __pthread_once_t;
#endif
#if defined(__is_sortix_libpthread)
typedef struct

5
libpthread/include/pthread.h
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@ -61,7 +61,6 @@ __BEGIN_DECLS
#define PTHREAD_MUTEX_RECURSIVE 1
/* TODO: #define PTHREAD_MUTEX_ROBUST */
/* TODO: #define PTHREAD_MUTEX_STALLED */
/* TODO: #define PTHREAD_ONCE_INIT */
/* TODO: #define PTHREAD_PRIO_INHERIT */
/* TODO: #define PTHREAD_PRIO_NONE */
/* TODO: #define PTHREAD_PRIO_PROTECT */
@ -161,6 +160,8 @@ struct pthread_cond_elem
#define PTHREAD_NORMAL_MUTEX_INITIALIZER_NP { 0, PTHREAD_MUTEX_NORMAL, 0, 0 }
#define PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP { 0, PTHREAD_MUTEX_RECURSIVE, 0, 0 }
#define PTHREAD_ONCE_INIT { PTHREAD_NORMAL_MUTEX_INITIALIZER_NP, 0 }
void pthread_initialize(void);
#if defined(__is_sortix_libpthread)
@ -256,7 +257,7 @@ int pthread_mutexattr_init(pthread_mutexattr_t*);
/* TODO: pthread_mutexattr_setpshared */
/* TODO: pthread_mutexattr_setrobust */
int pthread_mutexattr_settype(pthread_mutexattr_t*, int);
/* TODO: pthread_once */
int pthread_once(pthread_once_t*, void (*)(void));
int pthread_rwlock_destroy(pthread_rwlock_t*);
int pthread_rwlock_init(pthread_rwlock_t* __restrict,
const pthread_rwlockattr_t* __restrict);

42
libpthread/pthread_once.c++ Normal file
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@ -0,0 +1,42 @@
/*******************************************************************************
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;
}