+/* mallocator - recycle objects to avoid malloc() / free() */
+
+/* Copyright (c) 2006-2011. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
#include "xbt/mallocator.h"
#include "xbt/asserts.h"
#include "xbt/sysdep.h"
+#include "mc/mc.h" /* kill mallocators when model-checking is enabled */
#include "mallocator_private.h"
+XBT_LOG_NEW_DEFAULT_SUBCATEGORY(xbt_mallocator, xbt, "Mallocators");
+
+
+/* Change to 0 to completely disable mallocators. */
+#define MALLOCATOR_IS_WANTED 1
+
+/* Mallocators and memory mess introduced by model-checking do not mix well
+ * together: the mallocator will give standard memory when we are using raw
+ * memory (so these blocks are killed on restore) and the contrary (so these
+ * blocks will leak accross restores).
+ */
+#define MALLOCATOR_IS_ENABLED (MALLOCATOR_IS_WANTED && !MC_IS_ENABLED)
+
+/**
+ * \brief Constructor
+ * \param size size of the internal stack: number of objects the mallocator
+ * will be able to store
+ * \param new_f function to allocate a new object of your datatype, called
+ * in \a xbt_mallocator_get() when the mallocator is empty
+ * \param free_f function to free an object of your datatype, called
+ * in \a xbt_mallocator_release() when the stack is full, and when
+ * the mallocator is freed.
+ * \param reset_f function to reinitialise an object of your datatype, called
+ * when you extract an object from the mallocator (can be NULL)
+ *
+ * Create and initialize a new mallocator for a given datatype.
+ *
+ * \return pointer to the created mallocator
+ * \see xbt_mallocator_free()
+ */
xbt_mallocator_t xbt_mallocator_new(int size,
- pvoid_f_void_t new_f,
- void_f_pvoid_t free_f,
- void_f_pvoid_t reset_f) {
- xbt_assert0(size > 0, "size must be positive");
- xbt_assert0(new_f != NULL && free_f != NULL && reset_f != NULL,
- "invalid parameter");
- xbt_mallocator_t m = xbt_new0(s_xbt_mallocator_t, 1);
-
- m->objects = xbt_new0(void*, size);
- m->max_size = size;
+ pvoid_f_void_t new_f,
+ void_f_pvoid_t free_f,
+ void_f_pvoid_t reset_f)
+{
+ xbt_mallocator_t m;
+
+ xbt_assert(size > 0, "size must be positive");
+ xbt_assert(new_f != NULL && free_f != NULL, "invalid parameter");
+
+ m = xbt_new0(s_xbt_mallocator_t, 1);
+ XBT_VERB("Create mallocator %p", m);
m->current_size = 0;
m->new_f = new_f;
m->free_f = free_f;
m->reset_f = reset_f;
+ if (MALLOCATOR_IS_ENABLED) {
+ m->objects = xbt_new0(void *, size);
+ m->max_size = size;
+ } else {
+ if (!MALLOCATOR_IS_WANTED) /* Warn to avoid to commit debugging settings */
+ XBT_WARN("Mallocator is disabled!");
+ m->objects = NULL;
+ m->max_size = 0;
+ }
+
return m;
}
-/* Destroy the mallocator and all its data */
-void xbt_mallocator_free(xbt_mallocator_t m) {
- xbt_assert0(m != NULL, "Invalid parameter");
+/** \brief Destructor
+ * \param m the mallocator you want to destroy
+ *
+ * Destroy the mallocator and all its data. The function
+ * free_f is called on each object in the mallocator.
+ *
+ * \see xbt_mallocator_new()
+ */
+void xbt_mallocator_free(xbt_mallocator_t m)
+{
int i;
+ xbt_assert(m != NULL, "Invalid parameter");
+
+ XBT_VERB("Frees mallocator %p (size:%d/%d)", m, m->current_size,
+ m->max_size);
for (i = 0; i < m->current_size; i++) {
m->free_f(m->objects[i]);
}
xbt_free(m);
}
-/* Return an object (use this function instead of malloc) */
-void *xbt_mallocator_get(xbt_mallocator_t m) {
- xbt_assert0(m != NULL, "Invalid parameter");
-
+/**
+ * \brief Extract an object from a mallocator
+ * \param m a mallocator
+ *
+ * Remove an object from the mallocator and return it.
+ * This function is designed to be used instead of malloc().
+ * If the mallocator is not empty, an object is
+ * extracted from the mallocator and no malloc is done.
+ *
+ * If the mallocator is empty, a new object is created,
+ * by calling the function new_f().
+ *
+ * In both cases, the function reset_f() (if defined) is called on the object.
+ *
+ * \see xbt_mallocator_release()
+ */
+void *xbt_mallocator_get(xbt_mallocator_t m)
+{
void *object;
- if (m->current_size > 0) {
- /* there is at least an available object */
+
+ if (MALLOCATOR_IS_ENABLED) {
+ if (m->current_size <= 0) {
+ /* No object is ready yet. Create a bunch of them to try to group the
+ * mallocs on the same memory pages (to help the cache lines) */
+
+ /* XBT_DEBUG("Create a new object for mallocator %p (size:%d/%d)", */
+ /* m, m->current_size, m->max_size); */
+ int i;
+ int amount = MIN(m->max_size / 2, 1000);
+ for (i = 0; i < amount; i++)
+ m->objects[i] = m->new_f();
+ m->current_size = amount;
+ }
+
+ /* there is at least an available object, now */
+ /* XBT_DEBUG("Reuse an old object for mallocator %p (size:%d/%d)", */
+ /* m, m->current_size, m->max_size); */
object = m->objects[--m->current_size];
- }
- else {
- /* otherwise we must allocate a new object */
+ } else {
object = m->new_f();
}
- m->reset_f(object);
+
+ if (m->reset_f)
+ m->reset_f(object);
return object;
}
-/* Release an object (use this function instead of free) */
-void xbt_mallocator_release(xbt_mallocator_t m, void *object) {
- xbt_assert0(m != NULL && object != NULL, "Invalid parameter");
-
+/** \brief Push an object into a mallocator
+ * \param m a mallocator
+ * \param object an object you don't need anymore
+ *
+ * Push into the mallocator an object you don't need anymore.
+ * This function is designed to be used instead of free().
+ * If the mallocator is not full, your object if stored into
+ * the mallocator and no free is done.
+ * If the mallocator is full, the object is freed by calling
+ * the function free_f().
+ *
+ * \see xbt_mallocator_get()
+ */
+void xbt_mallocator_release(xbt_mallocator_t m, void *object)
+{
if (m->current_size < m->max_size) {
/* there is enough place to push the object */
+ /* XBT_DEBUG
+ ("Store deleted object in mallocator %p for further use (size:%d/%d)",
+ m, m->current_size, m->max_size); */
m->objects[m->current_size++] = object;
- }
- else {
+ } else {
/* otherwise we don't have a choice, we must free the object */
+ /* XBT_DEBUG("Free deleted object: mallocator %p is full (size:%d/%d)", m,
+ m->current_size, m->max_size); */
m->free_f(object);
}
}
