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jeremybenn |
/*
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* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
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* Copyright (c) 1997 by Silicon Graphics. All rights reserved.
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* Copyright (c) 2000 by Hewlett-Packard Company. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
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* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program
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* for any purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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* Original author: Bill Janssen
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* Heavily modified by Hans Boehm and others
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*/
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/*
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* This used to be in dyn_load.c. It was extracted into a separate file
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* to avoid having to link against libdl.{a,so} if the client doesn't call
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* dlopen. Of course this fails if the collector is in a dynamic
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* library. -HB
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*/
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#include "private/gc_priv.h"
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# if (defined(GC_PTHREADS) && !defined(GC_DARWIN_THREADS)) \
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|| defined(GC_SOLARIS_THREADS)
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# if defined(dlopen) && !defined(GC_USE_LD_WRAP)
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/* To support various threads pkgs, gc.h interposes on dlopen by */
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/* defining "dlopen" to be "GC_dlopen", which is implemented below. */
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/* However, both GC_FirstDLOpenedLinkMap() and GC_dlopen() use the */
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/* real system dlopen() in their implementation. We first remove */
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/* gc.h's dlopen definition and restore it later, after GC_dlopen(). */
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# undef dlopen
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# endif
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/* Make sure we're not in the middle of a collection, and make */
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/* sure we don't start any. Returns previous value of GC_dont_gc. */
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/* This is invoked prior to a dlopen call to avoid synchronization */
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/* issues. We can't just acquire the allocation lock, since startup */
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/* code in dlopen may try to allocate. */
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/* This solution risks heap growth in the presence of many dlopen */
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/* calls in either a multithreaded environment, or if the library */
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/* initialization code allocates substantial amounts of GC'ed memory. */
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/* But I don't know of a better solution. */
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static void disable_gc_for_dlopen()
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{
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LOCK();
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while (GC_incremental && GC_collection_in_progress()) {
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GC_collect_a_little_inner(1000);
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}
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++GC_dont_gc;
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UNLOCK();
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}
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/* Redefine dlopen to guarantee mutual exclusion with */
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/* GC_register_dynamic_libraries. */
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/* Should probably happen for other operating systems, too. */
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#include <dlfcn.h>
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#ifdef GC_USE_LD_WRAP
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void * __wrap_dlopen(const char *path, int mode)
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#else
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void * GC_dlopen(path, mode)
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GC_CONST char * path;
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int mode;
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#endif
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{
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void * result;
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# ifndef USE_PROC_FOR_LIBRARIES
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disable_gc_for_dlopen();
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# endif
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# ifdef GC_USE_LD_WRAP
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result = (void *)__real_dlopen(path, mode);
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# else
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result = dlopen(path, mode);
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# endif
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# ifndef USE_PROC_FOR_LIBRARIES
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GC_enable(); /* undoes disable_gc_for_dlopen */
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# endif
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return(result);
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}
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# endif /* GC_PTHREADS || GC_SOLARIS_THREADS ... */
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