{{ message }}
forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy paththread_nt.h
More file actions
475 lines (408 loc) · 11.2 KB
/
Copy paththread_nt.h
File metadata and controls
475 lines (408 loc) · 11.2 KB
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
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
/* This code implemented by Dag.Gruneau@elsa.preseco.comm.se */
/* Fast NonRecursiveMutex support by Yakov Markovitch, markovitch@iso.ru */
/* Eliminated some memory leaks, gsw@agere.com */
#include <windows.h>
#include <limits.h>
#ifdef HAVE_PROCESS_H
#include <process.h>
#endif
/* options */
#ifndef _PY_USE_CV_LOCKS
#define _PY_USE_CV_LOCKS 1 /* use locks based on cond vars */
#endif
/* Now, define a non-recursive mutex using either condition variables
* and critical sections (fast) or using operating system mutexes
* (slow)
*/
#if _PY_USE_CV_LOCKS
#include "condvar.h"
typedef struct _NRMUTEX
{
PyMUTEX_T cs;
PyCOND_T cv;
int locked;
} NRMUTEX;
typedef NRMUTEX *PNRMUTEX;
PNRMUTEX
AllocNonRecursiveMutex()
{
PNRMUTEX m = (PNRMUTEX)PyMem_RawMalloc(sizeof(NRMUTEX));
if (!m)
return NULL;
if (PyCOND_INIT(&m->cv))
goto fail;
if (PyMUTEX_INIT(&m->cs)) {
PyCOND_FINI(&m->cv);
goto fail;
}
m->locked = 0;
return m;
fail:
PyMem_RawFree(m);
return NULL;
}
VOID
FreeNonRecursiveMutex(PNRMUTEX mutex)
{
if (mutex) {
PyCOND_FINI(&mutex->cv);
PyMUTEX_FINI(&mutex->cs);
PyMem_RawFree(mutex);
}
}
DWORD
EnterNonRecursiveMutex(PNRMUTEX mutex, DWORD milliseconds)
{
DWORD result = WAIT_OBJECT_0;
if (PyMUTEX_LOCK(&mutex->cs))
return WAIT_FAILED;
if (milliseconds == INFINITE) {
while (mutex->locked) {
if (PyCOND_WAIT(&mutex->cv, &mutex->cs)) {
result = WAIT_FAILED;
break;
}
}
} else if (milliseconds != 0) {
/* wait at least until the target */
DWORD now, target = GetTickCount() + milliseconds;
while (mutex->locked) {
if (PyCOND_TIMEDWAIT(&mutex->cv, &mutex->cs, (long long)milliseconds*1000) < 0) {
result = WAIT_FAILED;
break;
}
now = GetTickCount();
if (target <= now)
break;
milliseconds = target-now;
}
}
if (!mutex->locked) {
mutex->locked = 1;
result = WAIT_OBJECT_0;
} else if (result == WAIT_OBJECT_0)
result = WAIT_TIMEOUT;
/* else, it is WAIT_FAILED */
PyMUTEX_UNLOCK(&mutex->cs); /* must ignore result here */
return result;
}
BOOL
LeaveNonRecursiveMutex(PNRMUTEX mutex)
{
BOOL result;
if (PyMUTEX_LOCK(&mutex->cs))
return FALSE;
mutex->locked = 0;
/* condvar APIs return 0 on success. We need to return TRUE on success. */
result = !PyCOND_SIGNAL(&mutex->cv);
PyMUTEX_UNLOCK(&mutex->cs);
return result;
}
#else /* if ! _PY_USE_CV_LOCKS */
/* NR-locks based on a kernel mutex */
#define PNRMUTEX HANDLE
PNRMUTEX
AllocNonRecursiveMutex()
{
return CreateSemaphore(NULL, 1, 1, NULL);
}
VOID
FreeNonRecursiveMutex(PNRMUTEX mutex)
{
/* No in-use check */
CloseHandle(mutex);
}
DWORD
EnterNonRecursiveMutex(PNRMUTEX mutex, DWORD milliseconds)
{
return WaitForSingleObjectEx(mutex, milliseconds, FALSE);
}
BOOL
LeaveNonRecursiveMutex(PNRMUTEX mutex)
{
return ReleaseSemaphore(mutex, 1, NULL);
}
#endif /* _PY_USE_CV_LOCKS */
unsigned long PyThread_get_thread_ident(void);
/*
* Initialization of the C package, should not be needed.
*/
static void
PyThread__init_thread(void)
{
}
/*
* Thread support.
*/
typedef struct {
void (*func)(void*);
void *arg;
} callobj;
/* thunker to call adapt between the function type used by the system's
thread start function and the internally used one. */
static unsigned __stdcall
bootstrap(void *call)
{
callobj *obj = (callobj*)call;
void (*func)(void*) = obj->func;
void *arg = obj->arg;
HeapFree(GetProcessHeap(), 0, obj);
func(arg);
return 0;
}
unsigned long
PyThread_start_new_thread(void (*func)(void *), void *arg)
{
HANDLE hThread;
unsigned threadID;
callobj *obj;
dprintf(("%lu: PyThread_start_new_thread called\n",
PyThread_get_thread_ident()));
if (!initialized)
PyThread_init_thread();
obj = (callobj*)HeapAlloc(GetProcessHeap(), 0, sizeof(*obj));
if (!obj)
return PYTHREAD_INVALID_THREAD_ID;
obj->func = func;
obj->arg = arg;
PyThreadState *tstate = _PyThreadState_GET();
size_t stacksize = tstate ? tstate->interp->pythread_stacksize : 0;
hThread = (HANDLE)_beginthreadex(0,
Py_SAFE_DOWNCAST(stacksize, Py_ssize_t, unsigned int),
bootstrap, obj,
0, &threadID);
if (hThread == 0) {
/* I've seen errno == EAGAIN here, which means "there are
* too many threads".
*/
int e = errno;
dprintf(("%lu: PyThread_start_new_thread failed, errno %d\n",
PyThread_get_thread_ident(), e));
threadID = (unsigned)-1;
HeapFree(GetProcessHeap(), 0, obj);
}
else {
dprintf(("%lu: PyThread_start_new_thread succeeded: %p\n",
PyThread_get_thread_ident(), (void*)hThread));
CloseHandle(hThread);
}
return threadID;
}
/*
* Return the thread Id instead of a handle. The Id is said to uniquely identify the
* thread in the system
*/
unsigned long
PyThread_get_thread_ident(void)
{
if (!initialized)
PyThread_init_thread();
return GetCurrentThreadId();
}
void
PyThread_exit_thread(void)
{
dprintf(("%lu: PyThread_exit_thread called\n", PyThread_get_thread_ident()));
if (!initialized)
exit(0);
_endthreadex(0);
}
/*
* Lock support. It has to be implemented as semaphores.
* I [Dag] tried to implement it with mutex but I could find a way to
* tell whether a thread already own the lock or not.
*/
PyThread_type_lock
PyThread_allocate_lock(void)
{
PNRMUTEX aLock;
dprintf(("PyThread_allocate_lock called\n"));
if (!initialized)
PyThread_init_thread();
aLock = AllocNonRecursiveMutex() ;
dprintf(("%lu: PyThread_allocate_lock() -> %p\n", PyThread_get_thread_ident(), aLock));
return (PyThread_type_lock) aLock;
}
void
PyThread_free_lock(PyThread_type_lock aLock)
{
dprintf(("%lu: PyThread_free_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
FreeNonRecursiveMutex(aLock) ;
}
/*
* Return 1 on success if the lock was acquired
*
* and 0 if the lock was not acquired. This means a 0 is returned
* if the lock has already been acquired by this thread!
*/
PyLockStatus
PyThread_acquire_lock_timed(PyThread_type_lock aLock,
PY_TIMEOUT_T microseconds, int intr_flag)
{
/* Fow now, intr_flag does nothing on Windows, and lock acquires are
* uninterruptible. */
PyLockStatus success;
PY_TIMEOUT_T milliseconds;
if (microseconds >= 0) {
milliseconds = microseconds / 1000;
if (microseconds % 1000 > 0)
++milliseconds;
if (milliseconds > PY_DWORD_MAX) {
Py_FatalError("Timeout larger than PY_TIMEOUT_MAX");
}
}
else {
milliseconds = INFINITE;
}
dprintf(("%lu: PyThread_acquire_lock_timed(%p, %lld) called\n",
PyThread_get_thread_ident(), aLock, microseconds));
if (aLock && EnterNonRecursiveMutex((PNRMUTEX)aLock,
(DWORD)milliseconds) == WAIT_OBJECT_0) {
success = PY_LOCK_ACQUIRED;
}
else {
success = PY_LOCK_FAILURE;
}
dprintf(("%lu: PyThread_acquire_lock(%p, %lld) -> %d\n",
PyThread_get_thread_ident(), aLock, microseconds, success));
return success;
}
int
PyThread_acquire_lock(PyThread_type_lock aLock, int waitflag)
{
return PyThread_acquire_lock_timed(aLock, waitflag ? -1 : 0, 0);
}
void
PyThread_release_lock(PyThread_type_lock aLock)
{
dprintf(("%lu: PyThread_release_lock(%p) called\n", PyThread_get_thread_ident(),aLock));
if (!(aLock && LeaveNonRecursiveMutex((PNRMUTEX) aLock)))
dprintf(("%lu: Could not PyThread_release_lock(%p) error: %ld\n", PyThread_get_thread_ident(), aLock, GetLastError()));
}
/* minimum/maximum thread stack sizes supported */
#define THREAD_MIN_STACKSIZE 0x8000 /* 32 KiB */
#define THREAD_MAX_STACKSIZE 0x10000000 /* 256 MiB */
/* set the thread stack size.
* Return 0 if size is valid, -1 otherwise.
*/
static int
_pythread_nt_set_stacksize(size_t size)
{
/* set to default */
if (size == 0) {
_PyInterpreterState_GET_UNSAFE()->pythread_stacksize = 0;
return 0;
}
/* valid range? */
if (size >= THREAD_MIN_STACKSIZE && size < THREAD_MAX_STACKSIZE) {
_PyInterpreterState_GET_UNSAFE()->pythread_stacksize = size;
return 0;
}
return -1;
}
#define THREAD_SET_STACKSIZE(x) _pythread_nt_set_stacksize(x)
/* Thread Local Storage (TLS) API
This API is DEPRECATED since Python 3.7. See PEP 539 for details.
*/
int
PyThread_create_key(void)
{
DWORD result = TlsAlloc();
if (result == TLS_OUT_OF_INDEXES)
return -1;
return (int)result;
}
void
PyThread_delete_key(int key)
{
TlsFree(key);
}
int
PyThread_set_key_value(int key, void *value)
{
BOOL ok = TlsSetValue(key, value);
return ok ? 0 : -1;
}
void *
PyThread_get_key_value(int key)
{
/* because TLS is used in the Py_END_ALLOW_THREAD macro,
* it is necessary to preserve the windows error state, because
* it is assumed to be preserved across the call to the macro.
* Ideally, the macro should be fixed, but it is simpler to
* do it here.
*/
DWORD error = GetLastError();
void *result = TlsGetValue(key);
SetLastError(error);
return result;
}
void
PyThread_delete_key_value(int key)
{
/* NULL is used as "key missing", and it is also the default
* given by TlsGetValue() if nothing has been set yet.
*/
TlsSetValue(key, NULL);
}
/* reinitialization of TLS is not necessary after fork when using
* the native TLS functions. And forking isn't supported on Windows either.
*/
void
PyThread_ReInitTLS(void)
{
}
/* Thread Specific Storage (TSS) API
Platform-specific components of TSS API implementation.
*/
int
PyThread_tss_create(Py_tss_t *key)
{
assert(key != NULL);
/* If the key has been created, function is silently skipped. */
if (key->_is_initialized) {
return 0;
}
DWORD result = TlsAlloc();
if (result == TLS_OUT_OF_INDEXES) {
return -1;
}
/* In Windows, platform-specific key type is DWORD. */
key->_key = result;
key->_is_initialized = 1;
return 0;
}
void
PyThread_tss_delete(Py_tss_t *key)
{
assert(key != NULL);
/* If the key has not been created, function is silently skipped. */
if (!key->_is_initialized) {
return;
}
TlsFree(key->_key);
key->_key = TLS_OUT_OF_INDEXES;
key->_is_initialized = 0;
}
int
PyThread_tss_set(Py_tss_t *key, void *value)
{
assert(key != NULL);
BOOL ok = TlsSetValue(key->_key, value);
return ok ? 0 : -1;
}
void *
PyThread_tss_get(Py_tss_t *key)
{
assert(key != NULL);
/* because TSS is used in the Py_END_ALLOW_THREAD macro,
* it is necessary to preserve the windows error state, because
* it is assumed to be preserved across the call to the macro.
* Ideally, the macro should be fixed, but it is simpler to
* do it here.
*/
DWORD error = GetLastError();
void *result = TlsGetValue(key->_key);
SetLastError(error);
return result;
}
You can’t perform that action at this time.