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Rename: src/mempool.c -> src/mi/mempool.c
(Logical change 1.162)
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src/mi/mempool.c
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src/mi/mempool.c
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/* libunwind - a platform-independent unwind library
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Copyright (C) 2002-2003 Hewlett-Packard Co
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Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include "libunwind.h"
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#include "mempool.h"
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#define MAX_ALIGN (sizeof (long double))
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#define SOS_MEMORY_SIZE 16384
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static char sos_memory[SOS_MEMORY_SIZE];
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static char *sos_memp;
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static size_t pg_size;
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HIDDEN void *
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sos_alloc (size_t size)
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{
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char *mem;
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#ifdef HAVE_CMPXCHG
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char *old_mem;
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size = (size + MAX_ALIGN - 1) & -MAX_ALIGN;
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if (!sos_memp)
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cmpxchg_ptr (&sos_memp, 0, sos_memory);
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do
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{
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old_mem = sos_memp;
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mem = (char *) (((unsigned long) old_mem + MAX_ALIGN - 1) & -MAX_ALIGN);
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mem += size;
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if (mem >= sos_memory + sizeof (sos_memory))
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abort ();
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}
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while (!cmpxchg_ptr (&sos_memp, old_mem, mem));
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#else
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static pthread_mutex_t sos_lock = PTHREAD_MUTEX_INITIALIZER;
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sigset_t saved_sigmask;
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size = (size + MAX_ALIGN - 1) & -MAX_ALIGN;
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sigprocmask (SIG_SETMASK, &unwi_full_sigmask, &saved_sigmask);
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mutex_lock(&sos_lock);
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{
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if (!sos_memp)
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sos_memp = sos_memory;
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mem = (char *) (((unsigned long) sos_memp + MAX_ALIGN - 1) & -MAX_ALIGN);
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mem += size;
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if (mem >= sos_memory + sizeof (sos_memory))
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abort ();
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sos_memp = mem;
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}
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mutex_unlock(&sos_lock);
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sigprocmask (SIG_SETMASK, &saved_sigmask, NULL);
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#endif
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return mem;
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}
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static void *
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alloc_memory (size_t size)
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{
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/* Hopefully, mmap() goes straight through to a system call stub... */
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void *mem = mmap (0, size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (mem == MAP_FAILED)
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return NULL;
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return mem;
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}
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/* Must be called while holding the mempool lock. */
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static void
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free_object (struct mempool *pool, void *object)
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{
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struct object *obj = object;
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obj->next = pool->free_list;
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pool->free_list = obj;
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++pool->num_free;
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}
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static void
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add_memory (struct mempool *pool, char *mem, size_t size, size_t obj_size)
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{
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char *obj;
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for (obj = mem; obj + obj_size <= mem + size; obj += obj_size)
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free_object (pool, obj);
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}
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static void
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expand (struct mempool *pool)
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{
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size_t size;
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char *mem;
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size = pool->chunk_size;
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mem = alloc_memory (size);
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if (!mem)
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{
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size = (pool->obj_size + pg_size - 1) & -pg_size;
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mem = alloc_memory (size);
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if (!mem)
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{
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/* last chance: try to allocate one object from the SOS memory */
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size = pool->obj_size;
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mem = sos_alloc (size);
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}
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}
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add_memory (pool, mem, size, pool->obj_size);
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}
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HIDDEN void
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mempool_init (struct mempool *pool, size_t obj_size, size_t reserve)
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{
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if (pg_size == 0)
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pg_size = getpagesize ();
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memset (pool, 0, sizeof (*pool));
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mutex_init (&pool->lock);
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/* round object-size up to integer multiple of MAX_ALIGN */
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obj_size = (obj_size + MAX_ALIGN - 1) & -MAX_ALIGN;
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if (!reserve)
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{
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reserve = pg_size / obj_size / 2;
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if (!reserve)
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reserve = 16;
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}
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pool->obj_size = obj_size;
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pool->reserve = reserve;
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pool->chunk_size = (2*reserve*obj_size + pg_size - 1) & -pg_size;
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expand (pool);
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}
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HIDDEN void *
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mempool_alloc (struct mempool *pool)
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{
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sigset_t saved_sigmask;
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struct object *obj;
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sigprocmask (SIG_SETMASK, &unwi_full_sigmask, &saved_sigmask);
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mutex_lock(&pool->lock);
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{
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if (pool->num_free <= pool->reserve)
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expand (pool);
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assert (pool->num_free > 0);
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--pool->num_free;
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obj = pool->free_list;
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pool->free_list = obj->next;
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}
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mutex_unlock(&pool->lock);
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sigprocmask (SIG_SETMASK, &saved_sigmask, NULL);
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return obj;
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}
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HIDDEN void
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mempool_free (struct mempool *pool, void *object)
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{
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sigset_t saved_sigmask;
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sigprocmask (SIG_SETMASK, &unwi_full_sigmask, &saved_sigmask);
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mutex_lock(&pool->lock);
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{
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free_object (pool, object);
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}
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mutex_unlock(&pool->lock);
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sigprocmask (SIG_SETMASK, &saved_sigmask, NULL);
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}
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