[PATCH 3/3] C11 threads support
Joel Sherrill
joel.sherrill at oarcorp.com
Wed Oct 7 23:03:33 UTC 2015
On 10/7/2015 5:04 PM, Jeff Johnston wrote:
> I am ok with this although I would like to hear that at least RTEMS or another configuration
> supports or plans to support threads.h and functions. C11 says that the flag __STDC_NO_THREADS__
> can be used to indicate that threads.h and the functions are missing.
>
RTEMS has support for C11 threads as well as C++11 threads. The work
may not be 100% complete at the moment but it is getting there.
FWIW Sebastian has run OpenMP on a 24-core PowerPC RTEMS system and
after some optimizations in the target specific adapter code, it
performs very well.
If I understated or overstated, I am sure Sebastian will correct me but
things are looking good for C11 and C++11 and RTEMS.
--joel
> -- Jeff J.
>
> ----- Original Message -----
>> Import <threads.h> from latest FreeBSD. Move types and defines to
>> <machine/_threads.h> so that it can be customized per target.
>>
>> newlib/ChangeLog
>> 2015-09-21 Sebastian Huber <sebastian.huber at embedded-brains.de>
>>
>> * libc/include/threads.h: New.
>> * libc/sys/rtems/include/machine/_threads.h: Likewise.
>> ---
>> newlib/libc/include/threads.h | 93
>> ++++++++++++++++++++++++
>> newlib/libc/sys/rtems/include/machine/_threads.h | 54 ++++++++++++++
>> 2 files changed, 147 insertions(+)
>> create mode 100644 newlib/libc/include/threads.h
>> create mode 100644 newlib/libc/sys/rtems/include/machine/_threads.h
>>
>> diff --git a/newlib/libc/include/threads.h b/newlib/libc/include/threads.h
>> new file mode 100644
>> index 0000000..9fb08b0
>> --- /dev/null
>> +++ b/newlib/libc/include/threads.h
>> @@ -0,0 +1,93 @@
>> +/*-
>> + * Copyright (c) 2011 Ed Schouten <ed at FreeBSD.org>
>> + * All rights reserved.
>> + *
>> + * Redistribution and use in source and binary forms, with or without
>> + * modification, are permitted provided that the following conditions
>> + * are met:
>> + * 1. Redistributions of source code must retain the above copyright
>> + * notice, this list of conditions and the following disclaimer.
>> + * 2. Redistributions in binary form must reproduce the above copyright
>> + * notice, this list of conditions and the following disclaimer in the
>> + * documentation and/or other materials provided with the distribution.
>> + *
>> + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
>> + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>> + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
>> PURPOSE
>> + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
>> + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
>> CONSEQUENTIAL
>> + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
>> + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
>> + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
>> STRICT
>> + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
>> + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
>> + * SUCH DAMAGE.
>> + */
>> +
>> +#ifndef _THREADS_H_
>> +#define _THREADS_H_
>> +
>> +#include <machine/_threads.h>
>> +#include <time.h>
>> +
>> +typedef void (*tss_dtor_t)(void *);
>> +typedef int (*thrd_start_t)(void *);
>> +
>> +enum {
>> + mtx_plain = 0x1,
>> + mtx_recursive = 0x2,
>> + mtx_timed = 0x4
>> +};
>> +
>> +enum {
>> + thrd_busy = 1,
>> + thrd_error = 2,
>> + thrd_nomem = 3,
>> + thrd_success = 4,
>> + thrd_timedout = 5
>> +};
>> +
>> +#if !defined(__cplusplus) || __cplusplus < 201103L
>> +#define thread_local _Thread_local
>> +#endif
>> +
>> +__BEGIN_DECLS
>> +void call_once(once_flag *, void (*)(void));
>> +int cnd_broadcast(cnd_t *);
>> +void cnd_destroy(cnd_t *);
>> +int cnd_init(cnd_t *);
>> +int cnd_signal(cnd_t *);
>> +int cnd_timedwait(cnd_t *__restrict, mtx_t *__restrict __mtx,
>> + const struct timespec *__restrict)
>> + __requires_exclusive(*__mtx);
>> +int cnd_wait(cnd_t *, mtx_t *__mtx)
>> + __requires_exclusive(*__mtx);
>> +void mtx_destroy(mtx_t *__mtx)
>> + __requires_unlocked(*__mtx);
>> +int mtx_init(mtx_t *__mtx, int)
>> + __requires_unlocked(*__mtx);
>> +int mtx_lock(mtx_t *__mtx)
>> + __locks_exclusive(*__mtx);
>> +int mtx_timedlock(mtx_t *__restrict __mtx,
>> + const struct timespec *__restrict)
>> + __trylocks_exclusive(thrd_success, *__mtx);
>> +int mtx_trylock(mtx_t *__mtx)
>> + __trylocks_exclusive(thrd_success, *__mtx);
>> +int mtx_unlock(mtx_t *__mtx)
>> + __unlocks(*__mtx);
>> +int thrd_create(thrd_t *, thrd_start_t, void *);
>> +thrd_t thrd_current(void);
>> +int thrd_detach(thrd_t);
>> +int thrd_equal(thrd_t, thrd_t);
>> +_Noreturn void
>> + thrd_exit(int);
>> +int thrd_join(thrd_t, int *);
>> +int thrd_sleep(const struct timespec *, struct timespec *);
>> +void thrd_yield(void);
>> +int tss_create(tss_t *, tss_dtor_t);
>> +void tss_delete(tss_t);
>> +void * tss_get(tss_t);
>> +int tss_set(tss_t, void *);
>> +__END_DECLS
>> +
>> +#endif /* !_THREADS_H_ */
>> diff --git a/newlib/libc/sys/rtems/include/machine/_threads.h
>> b/newlib/libc/sys/rtems/include/machine/_threads.h
>> new file mode 100644
>> index 0000000..24db21c
>> --- /dev/null
>> +++ b/newlib/libc/sys/rtems/include/machine/_threads.h
>> @@ -0,0 +1,54 @@
>> +/*
>> + * Copyright (c) 2015 embedded brains GmbH. All rights reserved.
>> + *
>> + * Redistribution and use in source and binary forms, with or without
>> + * modification, are permitted provided that the following conditions
>> + * are met:
>> + * 1. Redistributions of source code must retain the above copyright
>> + * notice, this list of conditions and the following disclaimer.
>> + * 2. Redistributions in binary form must reproduce the above copyright
>> + * notice, this list of conditions and the following disclaimer in the
>> + * documentation and/or other materials provided with the distribution.
>> + *
>> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
>> + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
>> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
>> + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
>> + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
>> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
>> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
>> + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
>> + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>> + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
>> + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>> + */
>> +
>> +#ifndef _MACHINE__THREADS_H_
>> +#define _MACHINE__THREADS_H_
>> +
>> +#include <machine/_default_types.h>
>> +#include <sys/lock.h>
>> +
>> +typedef struct _Condition_Control cnd_t;
>> +
>> +typedef struct _Mutex_recursive_Control mtx_t;
>> +
>> +/* pthread_t */
>> +typedef __uint32_t thrd_t;
>> +
>> +/* pthread_key_t */
>> +typedef __uint32_t tss_t;
>> +
>> +/* pthread_once_t */
>> +typedef struct {
>> + int _is_initialized;
>> + int _init_executed;
>> +} once_flag;
>> +
>> +/* PTHREAD_ONCE_INIT */
>> +#define ONCE_FLAG_INIT { 1, 0 }
>> +
>> +/* PTHREAD_DESTRUCTOR_ITERATIONS */
>> +#define TSS_DTOR_ITERATIONS 4
>> +
>> +#endif /* _MACHINE__THREADS_H_ */
>> --
>> 1.8.4.5
>>
>>
--
Joel Sherrill, Ph.D. Director of Research & Development
joel.sherrill at OARcorp.com On-Line Applications Research
Ask me about RTEMS: a free RTOS Huntsville AL 35805
Support Available (256) 722-9985
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