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
|
/* ---------------------------------------------------------------------------
*
* (c) The GHC Team, 2001-2005
*
* Accessing OS threads functionality in a (mostly) OS-independent
* manner.
*
* --------------------------------------------------------------------------*/
#include "Rts.h"
#if defined(THREADED_RTS)
#include "OSThreads.h"
#include "RtsUtils.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);
}
int
createOSThread (OSThreadId* pId, OSThreadProc *startProc, void *param)
{
return (_beginthreadex ( NULL, /* default security attributes */
0,
(unsigned (__stdcall *)(void *)) startProc,
param,
0,
(unsigned*)pId) == 0);
}
OSThreadId
osThreadId()
{
return GetCurrentThreadId();
}
#ifdef USE_CRITICAL_SECTIONS
void
initMutex (Mutex* pMut)
{
InitializeCriticalSectionAndSpinCount(pMut,4000);
}
#else
void
initMutex (Mutex* pMut)
{
HANDLE h = CreateMutex ( NULL, /* default sec. attributes */
FALSE, /* not owned => initially signalled */
NULL
);
*pMut = h;
return;
}
#endif
void
newThreadLocalKey (ThreadLocalKey *key)
{
DWORD r;
r = TlsAlloc();
if (r == TLS_OUT_OF_INDEXES) {
barf("newThreadLocalKey: out of keys");
}
*key = r;
}
void *
getThreadLocalVar (ThreadLocalKey *key)
{
void *r;
r = TlsGetValue(*key);
#ifdef DEBUG
// r is allowed to be NULL - it can mean that either there was an
// error or the stored value is in fact NULL.
if (GetLastError() != NO_ERROR) {
barf("getThreadLocalVar: key not found");
}
#endif
return r;
}
void
setThreadLocalVar (ThreadLocalKey *key, void *value)
{
BOOL b;
b = TlsSetValue(*key, value);
if (!b) {
barf("setThreadLocalVar: %d", GetLastError());
}
}
static unsigned __stdcall
forkOS_createThreadWrapper ( void * entry )
{
Capability *cap;
cap = rts_lock();
cap = rts_evalStableIO(cap, (HsStablePtr) entry, NULL);
rts_unlock(cap);
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);
}
#else /* !defined(THREADED_RTS) */
int
forkOS_createThread ( HsStablePtr entry STG_UNUSED )
{
return -1;
}
#endif /* !defined(THREADED_RTS) */
|
