From 13c41b2e3e0cf6996ea2d49e0557814607fe2f59 Mon Sep 17 00:00:00 2001 From: Sebastian Huber Date: Thu, 3 Sep 2015 11:26:36 +0000 Subject: [PATCH] [gomp] Add RTEMS configuration libgomp/ChangeLog * config/rtems/bar.c: New. * config/rtems/bar.h: Likewise. * config/rtems/mutex.c: Likewise. * config/rtems/mutex.h: Likewise. * config/rtems/sem.c: Likewise. * config/rtems/sem.h: Likewise. * configure.ac (*-*-rtems*): Check that Newlib provides a proper header file. * configure.tgt (*-*-rtems*): Enable RTEMS configuration if supported by Newlib. * configure: Regenerate. From-SVN: r227440 --- libgomp/ChangeLog | 14 +++ libgomp/config/rtems/bar.c | 255 +++++++++++++++++++++++++++++++++++++++++++ libgomp/config/rtems/bar.h | 170 +++++++++++++++++++++++++++++ libgomp/config/rtems/mutex.c | 1 + libgomp/config/rtems/mutex.h | 57 ++++++++++ libgomp/config/rtems/sem.c | 1 + libgomp/config/rtems/sem.h | 55 ++++++++++ libgomp/configure | 17 +++ libgomp/configure.ac | 7 ++ libgomp/configure.tgt | 6 + 10 files changed, 583 insertions(+) create mode 100644 libgomp/config/rtems/bar.c create mode 100644 libgomp/config/rtems/bar.h create mode 100644 libgomp/config/rtems/mutex.c create mode 100644 libgomp/config/rtems/mutex.h create mode 100644 libgomp/config/rtems/sem.c create mode 100644 libgomp/config/rtems/sem.h diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog index 319795c..c3e94bf 100644 --- a/libgomp/ChangeLog +++ b/libgomp/ChangeLog @@ -1,5 +1,19 @@ 2015-09-03 Sebastian Huber + * config/rtems/bar.c: New. + * config/rtems/bar.h: Likewise. + * config/rtems/mutex.c: Likewise. + * config/rtems/mutex.h: Likewise. + * config/rtems/sem.c: Likewise. + * config/rtems/sem.h: Likewise. + * configure.ac (*-*-rtems*): Check that Newlib provides a proper + header file. + * configure.tgt (*-*-rtems*): Enable RTEMS configuration if + supported by Newlib. + * configure: Regenerate. + +2015-09-03 Sebastian Huber + * team.c (gomp_new_thread_pool): Delete and move content to ... (gomp_get_thread_pool): ... new function. Allocate and initialize thread pool on demand. diff --git a/libgomp/config/rtems/bar.c b/libgomp/config/rtems/bar.c new file mode 100644 index 0000000..e5b3f76 --- /dev/null +++ b/libgomp/config/rtems/bar.c @@ -0,0 +1,255 @@ +/* Copyright (C) 2005-2015 Free Software Foundation, Inc. + Contributed by Sebastian Huber . + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + . */ + +/* This is the RTEMS implementation of a barrier synchronization + mechanism for libgomp. It is identical to the Linux implementation, except + that the futex API is slightly different. This type is private to the + library. */ + +#include "libgomp.h" +#include "bar.h" +#include + +static gomp_barrier_t * +generation_to_barrier (int *addr) +{ + return (gomp_barrier_t *) + ((char *) addr - __builtin_offsetof (gomp_barrier_t, generation)); +} + +static void +futex_wait (int *addr, int val) +{ + gomp_barrier_t *bar = generation_to_barrier (addr); + _Futex_Wait (&bar->futex, addr, val); +} + +static void +futex_wake (int *addr, int count) +{ + gomp_barrier_t *bar = generation_to_barrier (addr); + _Futex_Wake (&bar->futex, count); +} + +static int +do_spin (int *addr, int val) +{ + unsigned long long i, count = gomp_spin_count_var; + + if (__builtin_expect (gomp_managed_threads > gomp_available_cpus, 0)) + count = gomp_throttled_spin_count_var; + for (i = 0; i < count; i++) + if (__builtin_expect (__atomic_load_n (addr, MEMMODEL_RELAXED) != val, 0)) + return 0; + return 1; +} + +static void +do_wait (int *addr, int val) +{ + if (do_spin (addr, val)) + futex_wait (addr, val); +} + +/* Everything below this point should be identical to the Linux + implementation. */ + +void +gomp_barrier_wait_end (gomp_barrier_t *bar, gomp_barrier_state_t state) +{ + if (__builtin_expect (state & BAR_WAS_LAST, 0)) + { + /* Next time we'll be awaiting TOTAL threads again. */ + bar->awaited = bar->total; + __atomic_store_n (&bar->generation, bar->generation + BAR_INCR, + MEMMODEL_RELEASE); + futex_wake ((int *) &bar->generation, INT_MAX); + } + else + { + do + do_wait ((int *) &bar->generation, state); + while (__atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE) == state); + } +} + +void +gomp_barrier_wait (gomp_barrier_t *bar) +{ + gomp_barrier_wait_end (bar, gomp_barrier_wait_start (bar)); +} + +/* Like gomp_barrier_wait, except that if the encountering thread + is not the last one to hit the barrier, it returns immediately. + The intended usage is that a thread which intends to gomp_barrier_destroy + this barrier calls gomp_barrier_wait, while all other threads + call gomp_barrier_wait_last. When gomp_barrier_wait returns, + the barrier can be safely destroyed. */ + +void +gomp_barrier_wait_last (gomp_barrier_t *bar) +{ + gomp_barrier_state_t state = gomp_barrier_wait_start (bar); + if (state & BAR_WAS_LAST) + gomp_barrier_wait_end (bar, state); +} + +void +gomp_team_barrier_wake (gomp_barrier_t *bar, int count) +{ + futex_wake ((int *) &bar->generation, count == 0 ? INT_MAX : count); +} + +void +gomp_team_barrier_wait_end (gomp_barrier_t *bar, gomp_barrier_state_t state) +{ + unsigned int generation, gen; + + if (__builtin_expect (state & BAR_WAS_LAST, 0)) + { + /* Next time we'll be awaiting TOTAL threads again. */ + struct gomp_thread *thr = gomp_thread (); + struct gomp_team *team = thr->ts.team; + + bar->awaited = bar->total; + team->work_share_cancelled = 0; + if (__builtin_expect (team->task_count, 0)) + { + gomp_barrier_handle_tasks (state); + state &= ~BAR_WAS_LAST; + } + else + { + state &= ~BAR_CANCELLED; + state += BAR_INCR - BAR_WAS_LAST; + __atomic_store_n (&bar->generation, state, MEMMODEL_RELEASE); + futex_wake ((int *) &bar->generation, INT_MAX); + return; + } + } + + generation = state; + state &= ~BAR_CANCELLED; + do + { + do_wait ((int *) &bar->generation, generation); + gen = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + if (__builtin_expect (gen & BAR_TASK_PENDING, 0)) + { + gomp_barrier_handle_tasks (state); + gen = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + } + generation |= gen & BAR_WAITING_FOR_TASK; + } + while (gen != state + BAR_INCR); +} + +void +gomp_team_barrier_wait (gomp_barrier_t *bar) +{ + gomp_team_barrier_wait_end (bar, gomp_barrier_wait_start (bar)); +} + +void +gomp_team_barrier_wait_final (gomp_barrier_t *bar) +{ + gomp_barrier_state_t state = gomp_barrier_wait_final_start (bar); + if (__builtin_expect (state & BAR_WAS_LAST, 0)) + bar->awaited_final = bar->total; + gomp_team_barrier_wait_end (bar, state); +} + +bool +gomp_team_barrier_wait_cancel_end (gomp_barrier_t *bar, + gomp_barrier_state_t state) +{ + unsigned int generation, gen; + + if (__builtin_expect (state & BAR_WAS_LAST, 0)) + { + /* Next time we'll be awaiting TOTAL threads again. */ + /* BAR_CANCELLED should never be set in state here, because + cancellation means that at least one of the threads has been + cancelled, thus on a cancellable barrier we should never see + all threads to arrive. */ + struct gomp_thread *thr = gomp_thread (); + struct gomp_team *team = thr->ts.team; + + bar->awaited = bar->total; + team->work_share_cancelled = 0; + if (__builtin_expect (team->task_count, 0)) + { + gomp_barrier_handle_tasks (state); + state &= ~BAR_WAS_LAST; + } + else + { + state += BAR_INCR - BAR_WAS_LAST; + __atomic_store_n (&bar->generation, state, MEMMODEL_RELEASE); + futex_wake ((int *) &bar->generation, INT_MAX); + return false; + } + } + + if (__builtin_expect (state & BAR_CANCELLED, 0)) + return true; + + generation = state; + do + { + do_wait ((int *) &bar->generation, generation); + gen = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + if (__builtin_expect (gen & BAR_CANCELLED, 0)) + return true; + if (__builtin_expect (gen & BAR_TASK_PENDING, 0)) + { + gomp_barrier_handle_tasks (state); + gen = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + } + generation |= gen & BAR_WAITING_FOR_TASK; + } + while (gen != state + BAR_INCR); + + return false; +} + +bool +gomp_team_barrier_wait_cancel (gomp_barrier_t *bar) +{ + return gomp_team_barrier_wait_cancel_end (bar, gomp_barrier_wait_start (bar)); +} + +void +gomp_team_barrier_cancel (struct gomp_team *team) +{ + gomp_mutex_lock (&team->task_lock); + if (team->barrier.generation & BAR_CANCELLED) + { + gomp_mutex_unlock (&team->task_lock); + return; + } + team->barrier.generation |= BAR_CANCELLED; + gomp_mutex_unlock (&team->task_lock); + futex_wake ((int *) &team->barrier.generation, INT_MAX); +} diff --git a/libgomp/config/rtems/bar.h b/libgomp/config/rtems/bar.h new file mode 100644 index 0000000..c85dce3 --- /dev/null +++ b/libgomp/config/rtems/bar.h @@ -0,0 +1,170 @@ +/* Copyright (C) 2005-2015 Free Software Foundation, Inc. + Contributed by Sebastian Huber . + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + . */ + +/* This is the RTEMS implementation of a barrier synchronization + mechanism for libgomp. It is identical to the Linux implementation, except + that the futex API is slightly different. This type is private to the + library. */ + +#ifndef GOMP_BARRIER_H +#define GOMP_BARRIER_H 1 + +#include + +typedef struct +{ + /* Make sure total/generation is in a mostly read cacheline, while + awaited in a separate cacheline. */ + unsigned total __attribute__((aligned (64))); + unsigned generation; + struct _Futex_Control futex; + unsigned awaited __attribute__((aligned (64))); + unsigned awaited_final; +} gomp_barrier_t; + +typedef unsigned int gomp_barrier_state_t; + +/* The generation field contains a counter in the high bits, with a few + low bits dedicated to flags. Note that TASK_PENDING and WAS_LAST can + share space because WAS_LAST is never stored back to generation. */ +#define BAR_TASK_PENDING 1 +#define BAR_WAS_LAST 1 +#define BAR_WAITING_FOR_TASK 2 +#define BAR_CANCELLED 4 +#define BAR_INCR 8 + +static inline void gomp_barrier_init (gomp_barrier_t *bar, unsigned count) +{ + bar->total = count; + bar->awaited = count; + bar->awaited_final = count; + bar->generation = 0; + _Futex_Initialize (&bar->futex); +} + +static inline void gomp_barrier_reinit (gomp_barrier_t *bar, unsigned count) +{ + __atomic_add_fetch (&bar->awaited, count - bar->total, MEMMODEL_ACQ_REL); + bar->total = count; +} + +static inline void gomp_barrier_destroy (gomp_barrier_t *bar) +{ +} + +extern void gomp_barrier_wait (gomp_barrier_t *); +extern void gomp_barrier_wait_last (gomp_barrier_t *); +extern void gomp_barrier_wait_end (gomp_barrier_t *, gomp_barrier_state_t); +extern void gomp_team_barrier_wait (gomp_barrier_t *); +extern void gomp_team_barrier_wait_final (gomp_barrier_t *); +extern void gomp_team_barrier_wait_end (gomp_barrier_t *, + gomp_barrier_state_t); +extern bool gomp_team_barrier_wait_cancel (gomp_barrier_t *); +extern bool gomp_team_barrier_wait_cancel_end (gomp_barrier_t *, + gomp_barrier_state_t); +extern void gomp_team_barrier_wake (gomp_barrier_t *, int); +struct gomp_team; +extern void gomp_team_barrier_cancel (struct gomp_team *); + +static inline gomp_barrier_state_t +gomp_barrier_wait_start (gomp_barrier_t *bar) +{ + unsigned int ret = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + ret &= -BAR_INCR | BAR_CANCELLED; + /* A memory barrier is needed before exiting from the various forms + of gomp_barrier_wait, to satisfy OpenMP API version 3.1 section + 2.8.6 flush Construct, which says there is an implicit flush during + a barrier region. This is a convenient place to add the barrier, + so we use MEMMODEL_ACQ_REL here rather than MEMMODEL_ACQUIRE. */ + if (__atomic_add_fetch (&bar->awaited, -1, MEMMODEL_ACQ_REL) == 0) + ret |= BAR_WAS_LAST; + return ret; +} + +static inline gomp_barrier_state_t +gomp_barrier_wait_cancel_start (gomp_barrier_t *bar) +{ + return gomp_barrier_wait_start (bar); +} + +/* This is like gomp_barrier_wait_start, except it decrements + bar->awaited_final rather than bar->awaited and should be used + for the gomp_team_end barrier only. */ +static inline gomp_barrier_state_t +gomp_barrier_wait_final_start (gomp_barrier_t *bar) +{ + unsigned int ret = __atomic_load_n (&bar->generation, MEMMODEL_ACQUIRE); + ret &= -BAR_INCR | BAR_CANCELLED; + /* See above gomp_barrier_wait_start comment. */ + if (__atomic_add_fetch (&bar->awaited_final, -1, MEMMODEL_ACQ_REL) == 0) + ret |= BAR_WAS_LAST; + return ret; +} + +static inline bool +gomp_barrier_last_thread (gomp_barrier_state_t state) +{ + return state & BAR_WAS_LAST; +} + +/* All the inlines below must be called with team->task_lock + held. */ + +static inline void +gomp_team_barrier_set_task_pending (gomp_barrier_t *bar) +{ + bar->generation |= BAR_TASK_PENDING; +} + +static inline void +gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar) +{ + bar->generation &= ~BAR_TASK_PENDING; +} + +static inline void +gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar) +{ + bar->generation |= BAR_WAITING_FOR_TASK; +} + +static inline bool +gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar) +{ + return (bar->generation & BAR_WAITING_FOR_TASK) != 0; +} + +static inline bool +gomp_team_barrier_cancelled (gomp_barrier_t *bar) +{ + return __builtin_expect ((bar->generation & BAR_CANCELLED) != 0, 0); +} + +static inline void +gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state) +{ + bar->generation = (state & -BAR_INCR) + BAR_INCR; +} + +#endif /* GOMP_BARRIER_H */ diff --git a/libgomp/config/rtems/mutex.c b/libgomp/config/rtems/mutex.c new file mode 100644 index 0000000..39bb64d --- /dev/null +++ b/libgomp/config/rtems/mutex.c @@ -0,0 +1 @@ +/* Everything is in the header. */ diff --git a/libgomp/config/rtems/mutex.h b/libgomp/config/rtems/mutex.h new file mode 100644 index 0000000..39901ee --- /dev/null +++ b/libgomp/config/rtems/mutex.h @@ -0,0 +1,57 @@ +/* Copyright (C) 2015 Free Software Foundation, Inc. + Contributed by Sebastian Huber . + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + . */ + +/* This is the RTEMS implementation of a mutex synchronization + mechanism for libgomp. This type is private to the library. */ + +#ifndef GOMP_MUTEX_H +#define GOMP_MUTEX_H 1 + +#include + +typedef struct _Mutex_Control gomp_mutex_t; + +#define GOMP_MUTEX_INIT_0 1 + +static inline void gomp_mutex_init (gomp_mutex_t *mutex) +{ + _Mutex_Initialize (mutex); +} + +static inline void gomp_mutex_lock (gomp_mutex_t *mutex) +{ + _Mutex_Acquire (mutex); +} + +static inline void gomp_mutex_unlock (gomp_mutex_t *mutex) +{ + _Mutex_Release (mutex); +} + +static inline void gomp_mutex_destroy (gomp_mutex_t *mutex) +{ + _Mutex_Destroy (mutex); +} + +#endif /* GOMP_MUTEX_H */ diff --git a/libgomp/config/rtems/sem.c b/libgomp/config/rtems/sem.c new file mode 100644 index 0000000..39bb64d --- /dev/null +++ b/libgomp/config/rtems/sem.c @@ -0,0 +1 @@ +/* Everything is in the header. */ diff --git a/libgomp/config/rtems/sem.h b/libgomp/config/rtems/sem.h new file mode 100644 index 0000000..0d6765b --- /dev/null +++ b/libgomp/config/rtems/sem.h @@ -0,0 +1,55 @@ +/* Copyright (C) 2015 Free Software Foundation, Inc. + Contributed by Sebastian Huber . + + This file is part of the GNU OpenMP Library (libgomp). + + Libgomp is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3, or (at your option) + any later version. + + Libgomp 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 General Public License for + more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + . */ + +/* This is the RTEMS implementation of a semaphore synchronization + mechanism for libgomp. This type is private to the library. */ + +#ifndef GOMP_SEM_H +#define GOMP_SEM_H 1 + +#include + +typedef struct _Semaphore_Control gomp_sem_t; + +static inline void gomp_sem_init (gomp_sem_t *sem, int value) +{ + _Semaphore_Initialize (sem, (unsigned int) value); +} + +static inline void gomp_sem_wait (gomp_sem_t *sem) +{ + _Semaphore_Wait (sem); +} + +static inline void gomp_sem_post (gomp_sem_t *sem) +{ + _Semaphore_Post (sem); +} + +static inline void gomp_sem_destroy (gomp_sem_t *sem) +{ + _Semaphore_Destroy (sem); +} + +#endif /* GOMP_SEM_H */ diff --git a/libgomp/configure b/libgomp/configure index c93e877..74d4e82 100755 --- a/libgomp/configure +++ b/libgomp/configure @@ -15340,6 +15340,23 @@ $as_echo "#define HAVE_BROKEN_POSIX_SEMAPHORES 1" >>confdefs.h ;; esac +# RTEMS specific checks +case "$host" in + *-*-rtems*) + ac_fn_c_check_type "$LINENO" "struct _Mutex_Control" "ac_cv_type_struct__Mutex_Control" "#include +" +if test "x$ac_cv_type_struct__Mutex_Control" = x""yes; then : + +cat >>confdefs.h <<_ACEOF +#define HAVE_STRUCT__MUTEX_CONTROL 1 +_ACEOF + + +fi + + ;; +esac + # Check whether --enable-linux-futex was given. if test "${enable_linux_futex+set}" = set; then : enableval=$enable_linux_futex; diff --git a/libgomp/configure.ac b/libgomp/configure.ac index b1696d0..2e41ca8 100644 --- a/libgomp/configure.ac +++ b/libgomp/configure.ac @@ -216,6 +216,13 @@ case "$host" in ;; esac +# RTEMS specific checks +case "$host" in + *-*-rtems*) + AC_CHECK_TYPES([struct _Mutex_Control],[],[],[#include ]) + ;; +esac + GCC_LINUX_FUTEX(:) # Check for pthread_{,attr_}[sg]etaffinity_np. diff --git a/libgomp/configure.tgt b/libgomp/configure.tgt index 8fad977..f2236ae 100644 --- a/libgomp/configure.tgt +++ b/libgomp/configure.tgt @@ -153,6 +153,12 @@ case "${target}" in nvptx*-*-*) config_path="nvptx" + + *-*-rtems*) + # Use self-contained synchronization objects if provided by Newlib + if test "x$ac_cv_type_struct__Mutex_Control" = xyes ; then + config_path="rtems posix" + fi ;; *) -- 2.7.4