58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
#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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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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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_recursive_mutex);
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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_recursive_mutex);
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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_recursive_mutex);
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#endif
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}
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#endif
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