1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* ---------------------------------------------------------------------------
*
* (c) The GHC Team, 2001
*
* Accessing OS threads functionality in a (mostly) OS-independent
* manner.
*
*
* --------------------------------------------------------------------------*/
#include "Rts.h"
#if defined(RTS_SUPPORTS_THREADS)
#include "OSThreads.h"
#include "RtsUtils.h"
#if defined(HAVE_PTHREAD_H) && !defined(WANT_NATIVE_WIN32_THREADS)
/*
* This (allegedly) OS threads independent layer was initially
* abstracted away from code that used Pthreads, so the functions
* provided here are mostly just wrappers to the Pthreads API.
*
*/
void
initCondition( Condition* pCond )
{
pthread_cond_init(pCond, NULL);
return;
}
void
closeCondition( Condition* pCond )
{
pthread_cond_destroy(pCond);
return;
}
rtsBool
broadcastCondition ( Condition* pCond )
{
return (pthread_cond_broadcast(pCond) == 0);
}
rtsBool
signalCondition ( Condition* pCond )
{
return (pthread_cond_signal(pCond) == 0);
}
rtsBool
waitCondition ( Condition* pCond, Mutex* pMut )
{
return (pthread_cond_wait(pCond,pMut) == 0);
}
void
yieldThread()
{
sched_yield();
return;
}
void
shutdownThread()
{
pthread_exit(NULL);
}
/* Don't need the argument nor the result, at least not yet. */
static void* startProcWrapper(void* pProc);
static void*
startProcWrapper(void* pProc)
{
((void (*)(void))pProc)();
return NULL;
}
int
createOSThread ( OSThreadId* pId, void (*startProc)(void))
{
int result = pthread_create(pId, NULL, startProcWrapper, (void*)startProc);
if(!result)
pthread_detach(*pId);
return result;
}
OSThreadId
osThreadId()
{
return pthread_self();
}
void
initMutex(Mutex* pMut)
{
pthread_mutex_init(pMut,NULL);
return;
}
static void *
forkOS_createThreadWrapper ( void * entry )
{
rts_lock();
rts_evalStableIO((HsStablePtr) entry, NULL);
rts_unlock();
return NULL;
}
int
forkOS_createThread ( HsStablePtr entry )
{
pthread_t tid;
int result = pthread_create(&tid, NULL,
forkOS_createThreadWrapper, (void*)entry);
if(!result)
pthread_detach(tid);
return result;
}
#elif defined(HAVE_WINDOWS_H)
/* For reasons not yet clear, the entire contents of process.h is protected
* by __STRICT_ANSI__ not being defined.
*/
#undef __STRICT_ANSI__
#include <process.h>
/* Win32 threads and synchronisation objects */
/* A Condition is represented by a Win32 Event object;
* a Mutex by a Mutex kernel object.
*
* ToDo: go through the defn and usage of these to
* make sure the semantics match up with that of
* the (assumed) pthreads behaviour. This is really
* just a first pass at getting something compilable.
*/
void
initCondition( Condition* pCond )
{
HANDLE h = CreateEvent(NULL,
FALSE, /* auto reset */
FALSE, /* initially not signalled */
NULL); /* unnamed => process-local. */
if ( h == NULL ) {
errorBelch("initCondition: unable to create");
}
*pCond = h;
return;
}
void
closeCondition( Condition* pCond )
{
if ( CloseHandle(*pCond) == 0 ) {
errorBelch("closeCondition: failed to close");
}
return;
}
rtsBool
broadcastCondition ( Condition* pCond )
{
PulseEvent(*pCond);
return rtsTrue;
}
rtsBool
signalCondition ( Condition* pCond )
{
if (SetEvent(*pCond) == 0) {
barf("SetEvent: %d", GetLastError());
}
return rtsTrue;
}
rtsBool
waitCondition ( Condition* pCond, Mutex* pMut )
{
RELEASE_LOCK(pMut);
WaitForSingleObject(*pCond, INFINITE);
/* Hmm..use WaitForMultipleObjects() ? */
ACQUIRE_LOCK(pMut);
return rtsTrue;
}
void
yieldThread()
{
Sleep(0);
return;
}
void
shutdownThread()
{
_endthreadex(0);
}
static unsigned __stdcall startProcWrapper(void* pReal);
static unsigned __stdcall
startProcWrapper(void* pReal)
{
((void (*)(void))pReal)();
return 0;
}
int
createOSThread ( OSThreadId* pId, void (*startProc)(void))
{
return (_beginthreadex ( NULL, /* default security attributes */
0,
startProcWrapper,
(void*)startProc,
0,
(unsigned*)pId) == 0);
}
OSThreadId
osThreadId()
{
return GetCurrentThreadId();
}
void
initMutex (Mutex* pMut)
{
HANDLE h = CreateMutex ( NULL, /* default sec. attributes */
FALSE, /* not owned => initially signalled */
NULL
);
*pMut = h;
return;
}
static unsigned __stdcall
forkOS_createThreadWrapper ( void * entry )
{
rts_lock();
rts_evalStableIO((HsStablePtr) entry, NULL);
rts_unlock();
return 0;
}
int
forkOS_createThread ( HsStablePtr entry )
{
unsigned long pId;
return (_beginthreadex ( NULL, /* default security attributes */
0,
forkOS_createThreadWrapper,
(void*)entry,
0,
(unsigned*)&pId) == 0);
}
#endif /* defined(HAVE_PTHREAD_H) */
#else /* !defined(RTS_SUPPORTS_THREADS) */
int
forkOS_createThread ( HsStablePtr entry STG_UNUSED )
{
return -1;
}
#endif /* !defined(RTS_SUPPORTS_THREADS) */
|
