1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at http://curl.haxx.se/docs/copyright.html.
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 * $Id: nwlib.c,v 1.2 2004/03/17 13:36:45 bagder Exp $
22 ***************************************************************************/
30 #include <nks/thread.h>
31 #include <nks/synch.h>
46 NXKey_t perthreadkey; /* if -1, no key obtained... */
51 void *gLibHandle = (void *) NULL;
52 rtag_t gAllocTag = (rtag_t) NULL;
53 NXMutex_t *gLibLock = (NXMutex_t *) NULL;
55 /* internal library function prototypes... */
56 int DisposeLibraryData ( void * );
57 void DisposeThreadData ( void * );
58 int GetOrSetUpData ( int id, libdata_t **data, libthreaddata_t **threaddata );
66 const char *loadDirPath,
67 size_t uninitializedDataLength,
69 int (*readRoutineP)( int conn, void *fileHandle, size_t offset,
70 size_t nbytes, size_t *bytesRead, void *buffer ),
71 size_t customDataOffset,
72 size_t customDataSize,
77 NX_LOCK_INFO_ALLOC(liblock, "Per-Application Data Lock", 0);
80 #pragma unused(cmdLine)
81 #pragma unused(loadDirPath)
82 #pragma unused(uninitializedDataLength)
83 #pragma unused(NLMFileHandle)
84 #pragma unused(readRoutineP)
85 #pragma unused(customDataOffset)
86 #pragma unused(customDataSize)
87 #pragma unused(messageCount)
88 #pragma unused(messages)
92 ** Here we process our command line, post errors (to the error screen),
93 ** perform initializations and anything else we need to do before being able
94 ** to accept calls into us. If we succeed, we return non-zero and the NetWare
95 ** Loader will leave us up, otherwise we fail to load and get dumped.
97 gAllocTag = AllocateResourceTag(NLMHandle,
98 "<library-name> memory allocations", AllocSignature);
102 OutputToScreen(errorScreen, "Unable to allocate resource tag for "
103 "library memory allocations.\n");
107 gLibId = register_library(DisposeLibraryData);
111 OutputToScreen(errorScreen, "Unable to register library with kernel.\n");
115 gLibHandle = NLMHandle;
117 gLibLock = NXMutexAlloc(0, 0, &liblock);
121 OutputToScreen(errorScreen, "Unable to allocate library data lock.\n");
129 ** Here we clean up any resources we allocated. Resource tags is a big part
130 ** of what we created, but NetWare doesn't ask us to free those.
132 void _NonAppStop( void )
134 (void) unregister_library(gLibId);
135 NXMutexFree(gLibLock);
139 ** This function cannot be the first in the file for if the file is linked
140 ** first, then the check-unload function's offset will be nlmname.nlm+0
141 ** which is how to tell that there isn't one. When the check function is
142 ** first in the linked objects, it is ambiguous. For this reason, we will
143 ** put it inside this file after the stop function.
145 ** Here we check to see if it's alright to ourselves to be unloaded. If not,
146 ** we return a non-zero value. Right now, there isn't any reason not to allow
149 int _NonAppCheckUnload( void )
158 libthreaddata_t **threadData
163 libthreaddata_t *thread_data;
165 NX_LOCK_INFO_ALLOC(liblock, "Application Data Lock", 0);
168 thread_data = (libthreaddata_t *) NULL;
171 ** Attempt to get our data for the application calling us. This is where we
172 ** store whatever application-specific information we need to carry in support
173 ** of calling applications.
175 app_data = (libdata_t *) get_app_data(id);
180 ** This application hasn't called us before; set up application AND per-thread
181 ** data. Of course, just in case a thread from this same application is calling
182 ** us simultaneously, we better lock our application data-creation mutex. We
183 ** also need to recheck for data after we acquire the lock because WE might be
184 ** that other thread that was too late to create the data and the first thread
185 ** in will have created it.
189 if (!(app_data = (libdata_t *) get_app_data(id)))
191 app_data = (libdata_t *) malloc(sizeof(libdata_t));
195 memset(app_data, 0, sizeof(libdata_t));
197 app_data->tenbytes = malloc(10);
198 app_data->lock = NXMutexAlloc(0, 0, &liblock);
200 if (!app_data->tenbytes || !app_data->lock)
203 NXMutexFree(app_data->lock);
206 app_data = (libdata_t *) NULL;
213 ** Here we burn in the application data that we were trying to get by calling
214 ** get_app_data(). Next time we call the first function, we'll get this data
215 ** we're just now setting. We also go on here to establish the per-thread data
216 ** for the calling thread, something we'll have to do on each application
217 ** thread the first time it calls us.
219 err = set_app_data(gLibId, app_data);
224 app_data = (libdata_t *) NULL;
229 /* create key for thread-specific data... */
230 err = NXKeyCreate(DisposeThreadData, (void *) NULL, &key);
232 if (err) /* (no more keys left?) */
235 app_data->perthreadkey = key;
246 key = app_data->perthreadkey;
248 if ( key != -1 /* couldn't create a key? no thread data */
249 && !(err = NXKeyGetValue(key, (void **) &thread_data))
253 ** Allocate the per-thread data for the calling thread. Regardless of whether
254 ** there was already application data or not, this may be the first call by a
255 ** a new thread. The fact that we allocation 20 bytes on a pointer is not very
256 ** important, this just helps to demonstrate that we can have arbitrarily
257 ** complex per-thread data.
259 thread_data = (libthreaddata_t *) malloc(sizeof(libthreaddata_t));
263 thread_data->_errno = 0;
264 thread_data->twentybytes = malloc(20);
266 if (!thread_data->twentybytes)
269 thread_data = (libthreaddata_t *) NULL;
273 if ((err = NXKeySetValue(key, thread_data)))
275 free(thread_data->twentybytes);
277 thread_data = (libthreaddata_t *) NULL;
287 *threadData = thread_data;
292 int DisposeLibraryData
299 void *tenbytes = ((libdata_t *) data)->tenbytes;
310 void DisposeThreadData
317 void *twentybytes = ((libthreaddata_t *) data)->twentybytes;