mirror of git://gcc.gnu.org/git/gcc.git
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Copyright (C) 2025 Free Software Foundation, Inc.
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Contributed by Thomas Koenig, Nicolas Koenig, Andre Vehreschild
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This file is part of the GNU Fortran Shmem Coarray Library (caf_shmem).
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Caf_shmem is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Caf_shmem is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef SHARED_MEMORY_H
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#define SHARED_MEMORY_H
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#include "thread_support.h"
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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/* Global metadata for shared memory, always kept at offset 0. */
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typedef struct
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{
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size_t used;
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ptrdiff_t master;
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} global_shared_memory_meta;
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/* Type realization for shared_memory. */
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typedef struct shared_memory_act
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{
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union
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{
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void *base;
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global_shared_memory_meta *meta;
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} glbl;
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size_t size; // const
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caf_shmem_fd shm_fd;
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} shared_memory_act;
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/* A struct to serve as shared memory object. */
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typedef struct shared_memory_act * shared_memory;
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#define SHMPTR_NULL ((shared_mem_ptr) {.offset = 0})
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#define SHMPTR_IS_NULL(x) (x.offset == 0)
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#define SHMPTR_DEREF(x, s, sm) ((x) = *(__typeof (x) *) s.p)
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#define SHMPTR_AS(type, s, sm) ((type) (*((void **) sm) + s.offset))
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#define AS_SHMPTR(p, sm) ((shared_mem_ptr) {.offset = (p) - sm.glbl.base})
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#define SHARED_MEMORY_RAW_ALLOC(mem, t, n) \
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shared_memory_get_mem_with_alignment (mem, sizeof (t) * n, __alignof__ (t))
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#define SHARED_MEMORY_RAW_ALLOC_PTR(mem, t) \
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SHMPTR_AS (t *, SHARED_MEMORY_RAW_ALLOC (mem, t, 1), mem)
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/* A shared-memory pointer is implemented as an offset into the shared
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memory region. */
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typedef struct shared_mem_ptr
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{
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ptrdiff_t offset;
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} shared_mem_ptr;
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void shared_memory_init (shared_memory, size_t);
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void shared_memory_cleanup (shared_memory);
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void shared_memory_prepare (shared_memory);
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shared_mem_ptr shared_memory_get_mem_with_alignment (shared_memory mem,
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size_t size, size_t align);
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shared_mem_ptr shared_memory_get_master (shared_memory pmem, size_t size,
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size_t align);
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void shared_memory_set_env (pid_t pid);
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char *shared_memory_get_env (void);
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#endif
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