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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [mlock.c] - Blame information for rev 829

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1 207 jeremybenn
#ifndef MALLOC_PROVIDED
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/*
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FUNCTION
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<<__malloc_lock>>, <<__malloc_unlock>>---lock malloc pool
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INDEX
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        __malloc_lock
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INDEX
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        __malloc_unlock
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ANSI_SYNOPSIS
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        #include <malloc.h>
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        void __malloc_lock (struct _reent *<[reent]>);
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        void __malloc_unlock (struct _reent *<[reent]>);
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TRAD_SYNOPSIS
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        void __malloc_lock(<[reent]>)
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        struct _reent *<[reent]>;
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        void __malloc_unlock(<[reent]>)
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        struct _reent *<[reent]>;
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DESCRIPTION
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The <<malloc>> family of routines call these functions when they need to lock
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the memory pool.  The version of these routines supplied in the library use
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the lock API defined in sys/lock.h.  If multiple threads of execution can
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call <<malloc>>, or if <<malloc>> can be called reentrantly, then you need to
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define your own versions of these functions in order to safely lock the
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memory pool during a call.  If you do not, the memory pool may become
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corrupted.
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A call to <<malloc>> may call <<__malloc_lock>> recursively; that is,
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the sequence of calls may go <<__malloc_lock>>, <<__malloc_lock>>,
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<<__malloc_unlock>>, <<__malloc_unlock>>.  Any implementation of these
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routines must be careful to avoid causing a thread to wait for a lock
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that it already holds.
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*/
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#include <malloc.h>
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#include <sys/lock.h>
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#ifndef __SINGLE_THREAD__
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__LOCK_INIT_RECURSIVE(static, __malloc_lock_object);
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#endif
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void
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__malloc_lock (ptr)
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     struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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  __lock_acquire_recursive (__malloc_lock_object);
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#endif
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}
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void
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__malloc_unlock (ptr)
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     struct _reent *ptr;
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{
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#ifndef __SINGLE_THREAD__
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  __lock_release_recursive (__malloc_lock_object);
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#endif
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}
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#endif

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