malloc, realloc, free[manage memory]

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__malloc_lock, __malloc_unlock

[lock malloc pool]

#### SYNOPSIS

    #include <malloc.h>

    void __malloc_lock (void * reent );

    void __malloc_unlock (void * reent );

#### DESCRIPTION

The `malloc` family of routines call these functions when they need to lock the memory pool. The version of these routines supplied in the library does not do anything. If multiple threads of execution can call `malloc`, or if `malloc` can be called reentrantly, then you need to define your own versions of these functions in order to safely lock the memory pool during a call. If you do not, the memory pool may become corrupted.
A call to `malloc` may call `__malloc_lock` recursively; that is, the sequence of calls may go `__malloc_lock`, `__malloc_lock`, `__malloc_unlock`, `__malloc_unlock`. Any implementation of these routines must be careful to avoid causing a thread to wait for a lock that it already holds.