mm_chunk_destroy(struct mm_chunk *chunk)
{
mm_chunk_t tag = mm_chunk_gettag(chunk);
// A chunk from a shared memory space can be freed by any thread in
// the same manner utilizing synchronization mechanisms built-in to
// the corresponding memory allocation routines.
if (tag == MM_CHUNK_COMMON) {
mm_common_free(chunk);
return;
}
if (unlikely(tag == MM_CHUNK_GLOBAL)) {
mm_global_free(chunk);
return;
}
if (tag == MM_CHUNK_REGULAR) {
#if ENABLE_SMP
// In SMP mode regular memory space is just another case of
// shared space with built-in synchronization. So it can be
// freed by any thread alike.
mm_regular_free(chunk);
return;
#else
struct mm_thread *thread = mm_thread_selfptr();
if (mm_thread_ident(thread) == 0) {
mm_regular_free(chunk);
return;
}
#endif
}
// A chunk from a private space can be immediately freed by its
// originating thread but it is a subject for asynchronous memory
// reclamation mechanism for any other thread.
struct mm_thread *thread = mm_thread_selfptr();
if (tag == mm_thread_ident(thread)) {
mm_private_free(chunk);
return;
}
thread->deferred_chunks_count++;
mm_chunk_stack_insert(&thread->deferred_chunks, chunk);
mm_chunk_enqueue_deferred(thread, false);
}
mm_lock_getstat(struct mm_lock_stat_info *info)
{
// Get statistics collection pertinent to the lock in question.
struct mm_lock_stat_set *stat_set = mm_memory_load(info->stat);
if (stat_set == NULL)
stat_set = mm_lock_get_stat_set(info);
// Get a statistic entry specific to the calling thread.
struct mm_thread *thread = mm_thread_selfptr();
struct mm_domain *domain = mm_thread_getdomain(thread);
if (domain != NULL)
return mm_lock_get_domain_stat(stat_set, thread, domain);
else
return mm_lock_get_thread_stat(stat_set, thread);
}
struct mm_chunk * MALLOC
mm_chunk_create(size_t size)
{
// Prefer private space if available.
#if ENABLE_SMP
struct mm_private_space *space = mm_private_space_get();
if (mm_private_space_ready(space))
return mm_chunk_create_private(size);
#else
struct mm_thread *thread = mm_thread_selfptr();
if (mm_thread_ident(thread) == 0 && mm_private_space_ready(&mm_regular_space))
return mm_chunk_create_regular(size);
#endif
// Common space could only be used after it gets
// initialized during bootstrap.
if (likely(mm_common_space_ready()))
return mm_chunk_create_common(size);
// Use global allocator if everything else fails
// (that is during bootstrap and shutdown).
return mm_chunk_create_global(size);
}
