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thread.h
1 /* FreeTDS - Library of routines accessing Sybase and Microsoft databases
2  *
3  * Copyright (C) 2005 Liam Widdowson
4  * Copyright (C) 2010-2012 Frediano Ziglio
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Library General Public
8  * License as published by the Free Software Foundation; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Library General Public License for more details.
15  *
16  * You should have received a copy of the GNU Library General Public
17  * License along with this library; if not, write to the
18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19  * Boston, MA 02111-1307, USA.
20  */
21 
22 #ifndef TDSTHREAD_H
23 #define TDSTHREAD_H 1
24 
25 /* $Id: tdsthread.h,v 1.13 2011-09-09 08:50:47 freddy77 Exp $ */
26 
27 #undef TDS_HAVE_MUTEX
28 
29 #if defined(_THREAD_SAFE) && defined(TDS_HAVE_PTHREAD_MUTEX)
30 
31 #include <pthread.h>
32 
33 #include <freetds/pushvis.h>
34 
35 typedef pthread_mutex_t tds_mutex;
36 #define TDS_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
37 
38 static inline void tds_mutex_lock(tds_mutex *mtx)
39 {
40  pthread_mutex_lock(mtx);
41 }
42 
43 static inline int tds_mutex_trylock(tds_mutex *mtx)
44 {
45  return pthread_mutex_trylock(mtx);
46 }
47 
48 static inline void tds_mutex_unlock(tds_mutex *mtx)
49 {
50  pthread_mutex_unlock(mtx);
51 }
52 
53 static inline int tds_mutex_init(tds_mutex *mtx)
54 {
55  return pthread_mutex_init(mtx, NULL);
56 }
57 
58 static inline void tds_mutex_free(tds_mutex *mtx)
59 {
60  pthread_mutex_destroy(mtx);
61 }
62 
63 typedef pthread_cond_t tds_condition;
64 
65 int tds_cond_init(tds_condition *cond);
66 static inline int tds_cond_destroy(tds_condition *cond)
67 {
68  return pthread_cond_destroy(cond);
69 }
70 static inline int tds_cond_signal(tds_condition *cond)
71 {
72  return pthread_cond_signal(cond);
73 }
74 static inline int tds_cond_wait(tds_condition *cond, pthread_mutex_t *mtx)
75 {
76  return pthread_cond_wait(cond, mtx);
77 }
78 int tds_cond_timedwait(tds_condition *cond, pthread_mutex_t *mtx, int timeout_sec);
79 
80 #define TDS_HAVE_MUTEX 1
81 
82 typedef pthread_t tds_thread;
83 typedef void *(*tds_thread_proc)(void *arg);
84 #define TDS_THREAD_PROC_DECLARE(name, arg) \
85  void *name(void *arg)
86 
87 static inline int tds_thread_create(tds_thread *ret, tds_thread_proc proc, void *arg)
88 {
89  return pthread_create(ret, NULL, proc, arg);
90 }
91 
92 static inline int tds_thread_join(tds_thread th, void **ret)
93 {
94  return pthread_join(th, ret);
95 }
96 
97 #include <freetds/popvis.h>
98 
99 #elif defined(_WIN32)
100 
101 struct ptw32_mcs_node_t_;
102 
103 typedef struct {
104  struct ptw32_mcs_node_t_ *lock;
105  LONG done;
106  CRITICAL_SECTION crit;
107 } tds_mutex;
108 
109 #define TDS_MUTEX_INITIALIZER { NULL, 0 }
110 
111 static inline int
112 tds_mutex_init(tds_mutex *mtx)
113 {
114  mtx->lock = NULL;
115  mtx->done = 0;
116  return 0;
117 }
118 
119 void tds_win_mutex_lock(tds_mutex *mutex);
120 
121 static inline void tds_mutex_lock(tds_mutex *mtx)
122 {
123  if ((mtx)->done)
124  EnterCriticalSection(&(mtx)->crit);
125  else
126  tds_win_mutex_lock(mtx);
127 }
128 
129 int tds_mutex_trylock(tds_mutex *mtx);
130 
131 static inline void tds_mutex_unlock(tds_mutex *mtx)
132 {
133  LeaveCriticalSection(&(mtx)->crit);
134 }
135 
136 static inline void tds_mutex_free(tds_mutex *mtx)
137 {
138  if ((mtx)->done) {
139  DeleteCriticalSection(&(mtx)->crit);
140  (mtx)->done = 0;
141  }
142 }
143 
144 #define TDS_HAVE_MUTEX 1
145 
146 /* easy way, only single signal supported */
147 typedef void *TDS_CONDITION_VARIABLE;
148 typedef union {
149  HANDLE ev;
150  TDS_CONDITION_VARIABLE cv;
151 } tds_condition;
152 
153 extern int (*tds_cond_init)(tds_condition *cond);
154 extern int (*tds_cond_destroy)(tds_condition *cond);
155 extern int (*tds_cond_signal)(tds_condition *cond);
156 extern int (*tds_cond_timedwait)(tds_condition *cond, tds_mutex *mtx, int timeout_sec);
157 static inline int tds_cond_wait(tds_condition *cond, tds_mutex *mtx)
158 {
159  return tds_cond_timedwait(cond, mtx, -1);
160 }
161 
162 typedef HANDLE tds_thread;
163 typedef void *(WINAPI *tds_thread_proc)(void *arg);
164 #define TDS_THREAD_PROC_DECLARE(name, arg) \
165  void *WINAPI name(void *arg)
166 
167 static inline int tds_thread_create(tds_thread *ret, tds_thread_proc proc, void *arg)
168 {
169  *ret = CreateThread(NULL, 0, (DWORD (WINAPI *)(void*)) proc, arg, 0, NULL);
170  return *ret != NULL ? 0 : 11 /* EAGAIN */;
171 }
172 
173 static inline int tds_thread_join(tds_thread th, void **ret)
174 {
175  if (WaitForSingleObject(th, INFINITE) == WAIT_OBJECT_0) {
176  DWORD r;
177  if (ret && GetExitCodeThread(th, &r))
178  *ret = (void*) (((char*)0) + r);
179 
180  CloseHandle(th);
181  return 0;
182  }
183  CloseHandle(th);
184  return 22 /* EINVAL */;
185 }
186 
187 #else
188 
189 /* define noops as "successful" */
190 typedef struct {
191 } tds_mutex;
192 
193 #define TDS_MUTEX_INITIALIZER {}
194 
195 static inline void tds_mutex_lock(tds_mutex *mtx)
196 {
197 }
198 
199 static inline int tds_mutex_trylock(tds_mutex *mtx)
200 {
201  return 0;
202 }
203 
204 static inline void tds_mutex_unlock(tds_mutex *mtx)
205 {
206 }
207 
208 static inline int tds_mutex_init(tds_mutex *mtx)
209 {
210  return 0;
211 }
212 
213 static inline void tds_mutex_free(tds_mutex *mtx)
214 {
215 }
216 
217 typedef struct {
218 } tds_condition;
219 
220 static inline int tds_cond_init(tds_condition *cond)
221 {
222  return 0;
223 }
224 static inline int tds_cond_destroy(tds_condition *cond)
225 {
226  return 0;
227 }
228 #define tds_cond_signal(cond) \
229  FreeTDS_Condition_not_compiled
230 
231 #define tds_cond_wait(cond, mtx) \
232  FreeTDS_Condition_not_compiled
233 
234 #define tds_cond_timedwait(cond, mtx, timeout_sec) \
235  FreeTDS_Condition_not_compiled
236 
237 typedef struct {
238 } tds_thread;
239 
240 typedef void *(*tds_thread_proc)(void *arg);
241 #define TDS_THREAD_PROC_DECLARE(name, arg) \
242  void *name(void *arg)
243 
244 #define tds_thread_create(ret, proc, arg) \
245  FreeTDS_Thread_not_compiled
246 
247 #define tds_thread_join(th, ret) \
248  FreeTDS_Thread_not_compiled
249 
250 #endif
251 
252 #endif
Definition: thread.h:237
Definition: ptw32_MCS_lock.c:97
Definition: thread.h:217
Definition: thread.h:190