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atomic.c
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atomic.c
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/*
* Copyright (C) 2004-2021 Christos Tsantilas
*
* This program 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 2.1 of the License, or (at your option) any later version.
*
* This program 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 this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA.
*/
#include "common.h"
#include "atomic.h"
#include "ci_threads.h"
#include "debug.h"
#include "proc_mutex.h"
#if defined(__CI_INLINE_POSIX_ATOMICS)
__ci_implement_atomic_ops(,i32_non_inline, int32_t);
__ci_implement_atomic_ops(,u32_non_inline, uint32_t);
__ci_implement_atomic_ops(,u64_non_inline, uint64_t);
__ci_implement_atomic_ops(,i64_non_inline, int64_t);
#if defined(CI_ATOMICS_USE_128BIT)
#if defined(__clang__)
/* Suppress warning about "large atomic operation may incur significant
performance" */
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Watomic-alignment"
#endif
__ci_implement_atomic_ops(,u128_non_inline, unsigned __int128);
__ci_implement_atomic_ops(,i128_non_inline, __int128);
#if defined(__clang__)
#pragma clang diagnostic pop
#endif
#endif
int ci_atomics_init()
{
return 1;
}
#else
#define MTX_SIZE 5
static ci_thread_mutex_t thr_mtx[MTX_SIZE];
static ci_proc_mutex_t proc_mtx[MTX_SIZE];
#define get_mtx(array, pointer) (&array[((size_t)((void *)pointer - (void *)0)) % MTX_SIZE])
#define _implement_atomic_ops(name, type) \
void ci_atomic_load_##name(const type *counter, type *store) { \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
*store = *counter; \
ci_thread_mutex_unlock(mtx); \
} \
void ci_atomic_store_##name(type *counter, type store) { \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
*counter = store; \
ci_thread_mutex_unlock(mtx); \
} \
void ci_atomic_add_##name(type *counter, type add) { \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
*counter += add; \
ci_thread_mutex_unlock(mtx); \
} \
void ci_atomic_sub_##name(type *counter, type sub) { \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
*counter -= sub; \
ci_thread_mutex_unlock(mtx); \
} \
type ci_atomic_fetch_add_##name(type *counter, type add) { \
type old; \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
old = *counter; \
*counter += add; \
ci_thread_mutex_unlock(mtx); \
return old; \
} \
type ci_atomic_fetch_sub_##name(type *counter, type sub) { \
type old; \
ci_thread_mutex_t *mtx = get_mtx(thr_mtx, counter); \
ci_thread_mutex_lock(mtx); \
old = *counter; \
*counter -= sub; \
ci_thread_mutex_unlock(mtx); \
return old; \
} \
void ci_atomic_load_##name ## _gl(const type *counter, type *store) { \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
*store = *counter; \
ci_proc_mutex_unlock(mtx); \
} \
void ci_atomic_store_##name ## _gl(type *counter, type store) { \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
*counter = store; \
ci_proc_mutex_unlock(mtx); \
} \
void ci_atomic_add_##name ## _gl(type *counter, type add) { \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
*counter += add; \
ci_proc_mutex_unlock(mtx); \
} \
void ci_atomic_sub_##name ## _gl(type *counter, type sub) { \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
*counter -= sub; \
ci_proc_mutex_unlock(mtx); \
} \
type ci_atomic_fetch_add_##name ## _gl(type *counter, type add) { \
type old; \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
old = *counter; \
*counter += add; \
ci_proc_mutex_unlock(mtx); \
return old; \
} \
type ci_atomic_fetch_sub_##name ## _gl(type *counter, type sub) { \
type old; \
ci_proc_mutex_t *mtx = get_mtx(proc_mtx, counter); \
ci_proc_mutex_lock(mtx); \
old = *counter; \
*counter -= sub; \
ci_proc_mutex_unlock(mtx); \
return old; \
}
_implement_atomic_ops(i32_non_inline, int32_t);
_implement_atomic_ops(u32_non_inline, uint32_t);
_implement_atomic_ops(u64_non_inline, uint64_t);
_implement_atomic_ops(i64_non_inline, int64_t);
#if defined(CI_ATOMICS_USE_128BIT)
_implement_atomic_ops(u128_non_inline, unsigned __int128);
_implement_atomic_ops(i128_non_inline, __int128);
#endif
int ci_atomics_init()
{
int i;
for (i = 0; i < MTX_SIZE; ++i ) {
ci_thread_mutex_init(&(thr_mtx[i]));
}
int ret = 0 , error = 0;
for (i = 0; i < MTX_SIZE; ++i) {
char name[128];
snprintf(name, sizeof(name), "ci_atomic_%d", i);
ret = ci_proc_mutex_init(&(proc_mtx[i]), name);
if (!ret)
error = 1;
}
return !error;
}
#endif