2 * ====================================================================
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3 * Copyright (c) 2006 CollabNet. All rights reserved.
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5 * This software is licensed as described in the file COPYING, which
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6 * you should have received as part of this distribution. The terms
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7 * are also available at http://subversion.tigris.org/license-1.html.
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8 * If newer versions of this license are posted there, you may use a
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9 * newer version instead, at your option.
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11 * This software consists of voluntary contributions made by many
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12 * individuals. For exact contribution history, see the revision
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13 * history and logs, available at http://subversion.tigris.org/.
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14 * ====================================================================
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17 #include <apr_thread_mutex.h>
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18 #include <apr_hash.h>
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20 #include "svn_dso.h"
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21 #include "svn_pools.h"
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22 //#include "svn_private_config.h"
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24 /* A mutex to protect our global pool and cache. */
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26 static apr_thread_mutex_t *dso_mutex;
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29 /* Global pool to allocate DSOs in. */
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30 static apr_pool_t *dso_pool;
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32 /* Global cache for storing DSO objects. */
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33 static apr_hash_t *dso_cache;
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35 /* Just an arbitrary location in memory... */
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36 static int not_there_sentinel;
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38 /* A specific value we store in the dso_cache to indicate that the
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39 library wasn't found. This keeps us from allocating extra memory
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40 from dso_pool when trying to find libraries we already know aren't
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42 #define NOT_THERE ((void *) ¬_there_sentinel)
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45 svn_dso_initialize2(void)
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47 apr_status_t status;
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49 return SVN_NO_ERROR;
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51 dso_pool = svn_pool_create(NULL);
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54 status = apr_thread_mutex_create(&dso_mutex,
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55 APR_THREAD_MUTEX_DEFAULT, dso_pool);
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57 return svn_error_wrap_apr(status, _("Can't create DSO mutex"));
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60 dso_cache = apr_hash_make(dso_pool);
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61 return SVN_NO_ERROR;
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66 svn_dso_load(apr_dso_handle_t **dso, const char *fname)
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68 apr_status_t status;
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71 SVN_ERR(svn_dso_initialize2());
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74 status = apr_thread_mutex_lock(dso_mutex);
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76 return svn_error_wrap_apr(status, _("Can't grab DSO mutex"));
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79 *dso = apr_hash_get(dso_cache, fname, APR_HASH_KEY_STRING);
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81 /* First check to see if we've been through this before... We do this
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82 to avoid calling apr_dso_load multiple times for a given library,
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83 which would result in wasting small amounts of memory each time. */
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84 if (*dso == NOT_THERE)
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88 status = apr_thread_mutex_unlock(dso_mutex);
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90 return svn_error_wrap_apr(status, _("Can't ungrab DSO mutex"));
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92 return SVN_NO_ERROR;
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95 /* If we got nothing back from the cache, try and load the library. */
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98 status = apr_dso_load(dso, fname, dso_pool);
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103 /* It wasn't found, so set the special "we didn't find it" value. */
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104 apr_hash_set(dso_cache,
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105 apr_pstrdup(dso_pool, fname),
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106 APR_HASH_KEY_STRING,
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109 #if APR_HAS_THREADS
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110 status = apr_thread_mutex_unlock(dso_mutex);
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112 return svn_error_wrap_apr(status, _("Can't ungrab DSO mutex"));
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114 return SVN_NO_ERROR;
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117 /* Stash the dso so we can use it next time. */
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118 apr_hash_set(dso_cache,
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119 apr_pstrdup(dso_pool, fname),
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120 APR_HASH_KEY_STRING,
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124 #if APR_HAS_THREADS
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125 status = apr_thread_mutex_unlock(dso_mutex);
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127 return svn_error_wrap_apr(status, _("Can't ungrab DSO mutex"));
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130 return SVN_NO_ERROR;
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132 #endif /* APR_HAS_DSO */
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