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Fix stack usage monitoring routines
jonroach 9 Mar 2026 15:42
1 contributor
1326 lines36.5 KB
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9 months ago
4
1
 #include "coroutine.h"
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 #include <assert.h>
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 #include <setjmp.h>
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 #include <stdbool.h>
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 #include <stddef.h>
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 #include <stdio.h>
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 #include "cor_platform.h"
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8
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 // see CPython again, this time from ctypes.h
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 #if (defined (__SVR4) && defined (__sun)) || defined(COROUTINE_HAVE_ALLOCA_H)
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 # include <alloca.h>
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 #elif defined(MS_WIN32)
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 # include <malloc.h>
14
 #endif
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15
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 /* If the system does not define alloca(), we have to hope for a compiler builtin. */
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 #ifndef alloca
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 # if defined __GNUC__ || (__clang_major__ >= 4)
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 # define alloca __builtin_alloca
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 # else
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 # error "Could not define alloca() on your platform."
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 # endif
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 #endif
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 typedef struct Coroutines Coroutines;
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8 months ago
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 static void Coroutine_RunNext(void);
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 static Coroutine_Err _Coroutine_Continue(Coroutines *cors, Coroutine *cor, void *value, bool early);
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 static unsigned char *StackTopNow(void);
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 #ifndef NDEBUG
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 // In debug builds, use the built-in assert
33
 #define MyAssert assert
34
 #else
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 #if 1
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 // In non-debug builds, normally use this - all the asserts are disabled
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 #define MyAssert(cond)
38
 #else
39
 // In non-debug builds with stack problems, you can use this.
40
 // This activates all the asserts, and gives a line to put a
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 // breakpoint in your debugger.
42
 static void _MyAssert(bool cond, char const *msg)
43
 {
44
 if (!cond){
45
 fputs("Assertion failed: ", stdout);
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 fputs(msg, stdout);
47
 fputs("\n", stdout);
48
 }
49
 }
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 #define MyAssert(cond) _MyAssert(cond, #cond)
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 #endif
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 #endif
53
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 #define CHECK_SYSTEM_RUNNING \
55
 if (!g_c){ \
56
 return Coroutine_Err_SystemNotRunning; \
57
 }
58
 #define CHECK_SYSTEM_NOT_RUNNING \
59
 if (g_c){ \
60
 return Coroutine_Err_SystemRunning; \
61
 }
62
 #define CHECK_COROUTINE_THREAD \
63
 if (cor->coroutines != g_c){ \
64
 return Coroutine_Err_CoroutineFromWrongThread; \
65
 }
66
 #define CHECK_NO_COROUTINE_RUNNING \
67
 if (g_c->state != Coroutines_Started){ \
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 return Coroutine_Err_ACoroutineIsAlreadyRunning; \
69
 }
70
 #define CHECK_STACK_OVERRUN \
71
 { \
72
 Coroutine_Err err = Coroutine_StackHasOverrun(); \
73
 if (err){ \
74
 return err; \
75
 } \
76
 } while (0);
77
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78
 ///////////////////////////////////////////////////////////////////////////////
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 // 2-way linked lists...
80
 //
9 months ago
81
 // Brought inline here to avoid namespace polution
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82
 ///////////////////////////////////////////////////////////////////////////////
83
84
 typedef struct List_Link List_Link;
85
 struct List_Link {
86
 List_Link *next;
87
 List_Link *prev;
88
 };
89
90
 typedef struct List_Head List_Head;
91
 struct List_Head {
92
 union {
93
 struct {
94
 List_Link link;
95
 List_Link *filler;
96
 } fwd;
97
 struct {
98
 List_Link *filler;
99
 List_Link link;
100
 } back;
101
 };
102
 };
103
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105
 static inline bool List_IsEmpty(
106
 const List_Head *list
107
 ){
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108
 return list->fwd.link.next == &list->back.link;
109
 }
110
9 months ago
111
112
 static inline List_Link *List_GetHead(
113
 const List_Head *list
114
 ){
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115
 return List_IsEmpty(list) ? NULL : list->fwd.link.next;
116
 }
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117
118
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119
 static inline List_Link *List_Begin(
120
 const List_Head *list
121
 ){
122
 return list->fwd.link.next;
123
 }
124
125
126
 static inline bool Link_NextIsLink(
127
 const List_Link *link
128
 ){
129
 return link->next != NULL;
130
 }
131
132
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 static inline List_Link *Link_Next(
134
 List_Link *link
135
 ){
136
 return link->next;
137
 }
138
139
140
 static inline bool Link_PrevIsLink(
141
 const List_Link *link
142
 ){
143
 return link->prev != NULL;
144
 }
145
146
147
 static inline List_Link *Link_Prev(
148
 List_Link *link
149
 ){
150
 return link->prev;
151
 }
152
6 months ago
153
 static inline List_Link *List_GetTail(
154
 const List_Head *list
155
 ){
156
 return List_IsEmpty(list) ? NULL : list->back.link.prev;
157
 }
9 months ago
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159
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160
 #define OFFSETOF(Container, Field) ((char *)&((Container *)4)->Field - (char *)(Container *)4)
161
 #define List_Link_Container(Container, Link, link) ((Container *)((char *)(link) - OFFSETOF(Container, Link)))
162
9 months ago
163
164
 static inline void List_Init(
165
 List_Head *list
166
 ){
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4
167
 list->fwd.link.next = &list->back.link;
168
 list->fwd.link.prev = NULL;
169
 list->back.link.prev = &list->fwd.link;
170
 }
171
9 months ago
172
6 months ago
173
 static inline void Link_AddAfter(
174
 List_Link *link,
175
 List_Link *after
176
 ){
177
 link->next = after->next;
178
 link->prev = after;
179
 after->next->prev = link;
180
 after->next = link;
181
 }
182
183
9 months ago
184
 static inline void List_AddHead(
185
 List_Head *list,
186
 List_Link *link
187
 ){
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188
 Link_AddAfter(link, &list->fwd.link);
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4
189
 }
190
9 months ago
191
6 months ago
192
 static inline void Link_AddBefore(
193
 List_Link *link,
194
 List_Link *before
195
 ){
196
 link->prev = before->prev;
197
 link->next = before;
198
 before->prev->next = link;
199
 before->prev = link;
200
 }
201
202
9 months ago
203
 static inline void List_AddTail(
204
 List_Head *list,
205
 List_Link *link
206
 ){
6 months ago
207
 Link_AddBefore(link, &list->back.link);
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208
 }
209
9 months ago
210
6 months ago
211
 static inline void Link_Remove(
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212
 List_Link *link
213
 ){
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214
 link->prev->next = link->next;
215
 link->next->prev = link->prev;
216
 }
217
218
 ///////////////////////////////////////////////////////////////////////////////
219
 // ...2-way linked lists
220
 ///////////////////////////////////////////////////////////////////////////////
221
222
 enum {
223
 Coroutines_Starting,
224
 Coroutines_Started,
225
 Coroutines_Active,
226
 Coroutines_Stopping
227
 };
228
229
 enum {
230
 Chunk_Initial,
231
 Chunk_Create,
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 Chunk_Split,
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233
 Chunk_Enter
234
 };
235
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 typedef enum Coroutine_State {
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237
 Coroutine_Free,
238
 Coroutine_Idle,
239
 Coroutine_Running,
240
 Coroutine_Waiting,
241
 Coroutine_Complete
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 } Coroutine_State;
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243
244
 enum {
245
 Coroutines_Init,
246
 Coroutines_AllocatedChunk,
247
 Coroutines_CoroutineComplete,
248
 };
249
250
 struct Coroutine {
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251
 Coroutines *coroutines; // so can work with it off-thread
252
 List_Link link; // for whichever list it's on
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253
 List_Link all_link; // list of all Coroutines
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254
 jmp_buf buf; // how to get back to it
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255
 unsigned char *prev_limit; // the previous Coroutine's stack limit
256
 unsigned char *base; // where the base (high address) of this Coroutine's stack is
257
 unsigned char *limit; // where the limit (low address) of this Coroutine's stack is
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 unsigned char *guard; // where the stack overrun guard is
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259
 size_t size;
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 Coroutine_Start start; // entry point
261
 void *entry_param; // to pass to start
262
 void *value; // yielded/returned
263
 unsigned char *stack_top; // recorded at yield
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 Coroutine_State state;
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265
 };
266
267
 struct Coroutines {
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 _Cor_Mutex mutex;
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 jmp_buf controller; // to return from Coroutine_Run
270
 jmp_buf chunk_allocated;// for chunk allocation
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 size_t gap_before; // bytes between previous's stack_top and next's Coroutine
272
 size_t gap_after; // bytes between Coroutine and stack_base
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273
274
 // singletons
275
 Coroutine *tip; // top of stack chunk
276
 Coroutine *active; // currently running coroutine
277
 Coroutine *primary; // Coroutine_Run coroutine
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 unsigned char *stack_limit; // when not NULL, where the stack finishes
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279
280
 // lists
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281
 List_Head all; // all Coroutines (in address order)
282
 List_Head free; // free Coroutines
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283
 List_Head inactive; // idle or complete
284
 List_Head runable; // running or waiting to run
285
 List_Head waiting; // yielded / waiting to run
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 _Cor_Mutex waiting_mutex;
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4
287
9 months ago
288
 // Summary of the system
289
 Coroutine_Report report;
290
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291
 // state
292
 char state;
293
 };
294
6 months ago
295
 _Cor_thread_local Coroutines *g_c;
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296
 _Cor_thread_local unsigned char *g_stack_limit;
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4
297
6 months ago
298
 static void ReserveStackSpace(Coroutines *cors, Coroutine *parent, size_t chunk_size, unsigned char *childs_limit);
6 months ago
299
 static void stack_chunk_base(Coroutines *cors, Coroutine *parent, unsigned char *prev_limit, unsigned char *limit);
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4
300
9 months ago
301
7 months ago
302
 #define GUARD_PATTERN_SIZE (4)
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303
 // Check whether the guard is intact
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304
 static inline bool Guard_Pattern_OK(
9 months ago
305
 unsigned char *guard
306
 ){
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307
 return !guard ||
308
 (guard[0] == 0xde &&
309
 guard[1] == 0xad &&
310
 guard[2] == 0xbe &&
311
 guard[3] == 0xef);
9 months ago
312
 }
313
314
7 months ago
315
 static inline void Apply_Guard(unsigned char *guard){
316
 guard[0] = 0xde;
317
 guard[1] = 0xad;
318
 guard[2] = 0xbe;
319
 guard[3] = 0xef;
320
 }
321
322
4 months ago
323
 #ifndef NDEBUG
4 months ago
324
 static Coroutine_Err CheckListIntegrity(List_Head *head, Coroutine_State state1, Coroutine_State state2){
4 months ago
325
 for (List_Link *link = List_Begin(head); Link_NextIsLink(link); link = Link_Next(link)){
326
 Coroutine *candidate = List_Link_Container(Coroutine, link, link);
4 months ago
327
 if (candidate->coroutines != g_c){
328
 return Coroutine_Err_InternalInsistency;
329
 }
330
 if(candidate->state != state1 && candidate->state != state2){
331
 return Coroutine_Err_InternalInsistency;
332
 }
4 months ago
333
 bool found = false;
334
 for (List_Link *link = List_Begin(&g_c->all); Link_NextIsLink(link); link = Link_Next(link)){
335
 Coroutine *candidate2 = List_Link_Container(Coroutine, all_link, link);
336
 if (candidate == candidate2){
337
 found = true;
338
 }
339
 }
4 months ago
340
 if (!found){
341
 return Coroutine_Err_InternalInsistency;
342
 }
4 months ago
343
 }
4 months ago
344
 return Coroutine_OK;
4 months ago
345
 }
346
347
4 months ago
348
 Coroutine_Err Coroutine_CheckIntegrity(void){
349
 Coroutine_Err err;
350
 err = CheckListIntegrity(&g_c->free, Coroutine_Free, Coroutine_Free);
351
 if (err){
352
 return err;
353
 }
354
 err = CheckListIntegrity(&g_c->inactive, Coroutine_Idle, Coroutine_Complete);
355
 if (err){
356
 return err;
357
 }
358
 err = CheckListIntegrity(&g_c->runable, Coroutine_Running, Coroutine_Running);
359
 if (err){
360
 return err;
361
 }
362
 err = CheckListIntegrity(&g_c->waiting, Coroutine_Waiting, Coroutine_Waiting);
363
 return err;
4 months ago
364
 }
4 months ago
365
 #endif
366
367
4 months ago
368
 static Coroutine_Err Coroutine_StackHasOverrun(void){
7 months ago
369
 unsigned char *stack_top = StackTopNow();
6 months ago
370
 unsigned char *stack_limit = g_c ? g_c->stack_limit : NULL;
7 months ago
371
 if (stack_limit && stack_top < stack_limit){
4 months ago
372
 // printf("top %p < limit %p\n", stack_top, stack_limit);
7 months ago
373
 // current stack top is beyond limit - we are overrunning NOW
4 months ago
374
 return Coroutine_Err_StackOverrun;
7 months ago
375
 }
4 months ago
376
 // if (stack_limit && stack_top < stack_limit+2048){
377
 // printf("Stack LOW hazard\n");
378
 // }
6 months ago
379
 Coroutine *me = g_c ? g_c->active : NULL;
7 months ago
380
 if (!me){
4 months ago
381
 return Coroutine_OK;
7 months ago
382
 }
4 months ago
383
 #if COROUTINE_CHECK_INTEGRITY_ON_STACK_CHECK
384
 // Check all coroutines integrity
4 months ago
385
 Coroutine_Err err = Coroutine_CheckIntegrity();
386
 if (err){
387
 return err;
388
 }
4 months ago
389
 #endif
7 months ago
390
 if (me->guard){
4 months ago
391
 return Guard_Pattern_OK(me->guard) ? Coroutine_OK : Coroutine_Err_StackOverrun;
7 months ago
392
 }
4 months ago
393
 return stack_top >= me->limit ? Coroutine_OK : Coroutine_Err_StackOverrun;
7 months ago
394
 }
395
396
6 months ago
397
 static void ReserveStackSpace(
398
 Coroutines *cors,
7 months ago
399
 Coroutine *parent,
6 months ago
400
 size_t chunk_size,
401
 unsigned char *childs_limit
9 months ago
402
 ){
7 months ago
403
 unsigned char *chunk_of_stack = alloca(chunk_size);
404
 #if COROUTINE_RECORD_LOWEST_HEADROOM
405
 for (size_t i = 0; i <= chunk_size-GUARD_PATTERN_SIZE; i += GUARD_PATTERN_SIZE){
406
 Apply_Guard(&chunk_of_stack[i]);
407
 }
408
 #else
7 months ago
409
 Apply_Guard(chunk_of_stack);
7 months ago
410
 #endif
6 months ago
411
 if (parent){
412
 parent->guard = chunk_of_stack;
413
 parent->limit = chunk_of_stack;
414
 parent->base = chunk_of_stack + chunk_size;
415
 }
6 months ago
416
 stack_chunk_base(cors, parent, chunk_of_stack, childs_limit);
9 months ago
4
417
 }
418
9 months ago
419
420
 static void stack_chunk_base(
6 months ago
421
 Coroutines *cors,
6 months ago
422
 Coroutine *parent,
6 months ago
423
 unsigned char *prev_limit,
424
 unsigned char *limit
9 months ago
425
 ){
9 months ago
4
426
 Coroutine here;
6 months ago
427
 here.coroutines = cors;
7 months ago
428
 here.state = Coroutine_Free;
6 months ago
429
 here.prev_limit = prev_limit;
430
 here.size = 0;
431
 here.base = NULL;
432
 here.guard = limit;
433
 here.limit = limit;
434
 if (limit){
435
 here.base = (unsigned char *)&here - cors->gap_after;
436
 here.size = here.base - here.limit;
437
 Apply_Guard(limit);
438
 }
439
6 months ago
440
 // insert into all list
441
 if (parent){
442
 Link_AddAfter(&here.all_link, &parent->all_link);
443
 } else {
444
 List_AddHead(&cors->all, &here.all_link);
6 months ago
445
 }
6 months ago
446
 // add to free list
447
 List_AddTail(&cors->free, &here.link);
6 months ago
448
449
 cors->report.coroutines_pool_size += 1;
450
451
 if (!cors->tip || &here < cors->tip){
452
 cors->tip = &here;
453
 }
454
7 months ago
455
 for(;;){
456
 switch (setjmp(here.buf)) {
457
 case Chunk_Initial:
7 months ago
458
 if (here.state == Coroutine_Free){
7 months ago
459
 // return to the coroutine allocator
6 months ago
460
 longjmp(cors->chunk_allocated, 1);
7 months ago
461
 } else {
4 months ago
462
 MyAssert(here.state == Coroutine_Complete);
7 months ago
463
 // we finish here to ensure the setjmp is redone
6 months ago
464
 if (cors->primary == &here) {
7 months ago
465
 // if primary coroutine - return to Coroutine_Run
6 months ago
466
 longjmp(cors->controller, Coroutines_CoroutineComplete);
7 months ago
467
 }
6 months ago
468
 _Cor_Mutex_Unlock(&cors->mutex);
7 months ago
469
 Coroutine_RunNext();
470
 }
3 months ago
471
 MyAssert(false);
472
 break;
7 months ago
473
 case Chunk_Create:
7 months ago
474
 // Request to create a new chunk on the stack
475
 // We're here if the coroutine is:
476
 // Allocated, but not 'run' (Coroutine_Idle)
477
 // Run, but not not entered yet (Coroutine_Running)
478
 // Completed (Coroutine_Complete)
6 months ago
479
 // Free, and the coroutines system is starting - we're characterising the system
4 months ago
480
 MyAssert(here.state == Coroutine_Idle ||
6 months ago
481
 here.state == Coroutine_Running ||
482
 here.state == Coroutine_Complete ||
483
 (here.state == Coroutine_Free && cors->state == Coroutines_Starting));
484
 ReserveStackSpace(here.coroutines, &here, here.size, NULL);
4 months ago
485
 MyAssert(false);
3 months ago
486
 break;
6 months ago
487
 case Chunk_Split:
488
 // Request to split this free block into two
489
 // here.size will be set to our shorter size
490
 ReserveStackSpace(here.coroutines, &here, here.size, here.limit);
4 months ago
491
 MyAssert(false);
3 months ago
492
 break;
7 months ago
493
 case Chunk_Enter:
494
 // request to start a coroutine (ie use the chunk for a coroutine)
495
 // arrive here with mutex locked
4 months ago
496
 MyAssert(here.state == Coroutine_Running);
6 months ago
497
 here.coroutines->active = &here;
498
 _Cor_Mutex_Unlock(&cors->mutex);
7 months ago
499
 here.value = here.start(here.entry_param);
9 months ago
500
7 months ago
501
 // check the guard
4 months ago
502
 MyAssert(Guard_Pattern_OK(here.guard));
9 months ago
503
6 months ago
504
 _Cor_Mutex_Lock(&here.coroutines->mutex);
505
 here.coroutines->active = NULL;
4 months ago
506
 MyAssert(here.state == Coroutine_Running);
6 months ago
507
 Link_Remove(&here.link);
7 months ago
508
 here.state = Coroutine_Complete;
6 months ago
509
 List_AddTail(&here.coroutines->inactive, &here.link);
7 months ago
510
 // Coroutine has completed
511
 // Loop round to redo the setjmp() - if this coroutine yielded, then the setjmp will
512
 // need reseting
3 months ago
513
 break;
9 months ago
4
514
 }
515
 }
516
 }
517
9 months ago
518
8 months ago
519
 static void Coroutine_RunNext(void)
9 months ago
520
 {
521
 // arrive here with mutex unlocked
6 months ago
522
 _Cor_Mutex_Lock(&g_c->waiting_mutex);
523
 _Cor_Mutex_Lock(&g_c->mutex);
524
 Coroutine *next = List_Link_Container(Coroutine, link, List_GetHead(&g_c->runable));
4 months ago
525
 MyAssert(next->state == Coroutine_Running);
9 months ago
526
 longjmp(next->buf, Chunk_Enter);
4 months ago
527
 MyAssert(false);
9 months ago
528
 }
529
530
4 months ago
531
 static Coroutine_Err Coroutines_ctor(Coroutines *cors)
9 months ago
4
532
 {
6 months ago
533
 cors->state = Coroutines_Starting;
4 months ago
534
 if (_Cor_Mutex_ctor(&cors->mutex)){
535
 return Coroutine_Err_CouldNotInitialiseSystem;
536
 }
6 months ago
537
 cors->tip = NULL;
538
 cors->active = NULL;
6 months ago
539
 cors->primary = NULL;
5 months ago
540
 cors->stack_limit = g_stack_limit;
9 months ago
4
541
6 months ago
542
 List_Init(&cors->all);
6 months ago
543
 List_Init(&cors->free);
544
 List_Init(&cors->inactive);
545
 List_Init(&cors->runable);
546
 List_Init(&cors->waiting);
4 months ago
547
 if (_Cor_Mutex_ctor(&cors->waiting_mutex)){
548
 _Cor_Mutex_dtor(&cors->mutex);
549
 return Coroutine_Err_CouldNotInitialiseSystem;
550
 }
551
 if (_Cor_Mutex_Lock(&cors->waiting_mutex)){
552
 _Cor_Mutex_dtor(&cors->waiting_mutex);
553
 _Cor_Mutex_dtor(&cors->mutex);
554
 return Coroutine_Err_CouldNotInitialiseSystem;
555
 }
9 months ago
4
556
6 months ago
557
 cors->report.coroutines_created = 0;
558
 cors->report.coroutines_pool_size = 0;
559
 cors->report.largest_stack = 0;
560
561
 // Charactersize the system...
562
 if (!setjmp(cors->chunk_allocated)){
563
 ReserveStackSpace(cors, NULL, COROUTINE_STARTUP_STACK_SIZE, NULL);
9 months ago
4
564
 }
6 months ago
565
 Coroutine *cor = List_Link_Container(Coroutine, link, List_GetHead(&cors->free));
566
 cor->size = COROUTINE_STARTUP_STACK_SIZE;
567
 if (!setjmp(cors->chunk_allocated)){
568
 longjmp(cor->buf, Chunk_Create);
569
 }
570
 cors->gap_before = cor->prev_limit - (unsigned char *)cor;
571
 cors->gap_after = (unsigned char *)cor - cor->base;
572
 // ...charactersize the system
9 months ago
573
6 months ago
574
 // discard what we've just created
6 months ago
575
 List_Init(&cors->all);
6 months ago
576
 List_Init(&cors->free);
577
 cors->tip = NULL;
578
579
 cors->state = Coroutines_Started;
4 months ago
580
 return Coroutine_OK;
581
 }
6 months ago
582
4 months ago
583
 static void Coroutines_dtor(Coroutines *cors)
584
 {
585
 _Cor_Mutex_Lock(&cors->mutex);
586
 cors->state = Coroutines_Stopping;
587
4 months ago
588
 MyAssert(List_IsEmpty(&cors->inactive));
4 months ago
589
 _Cor_Mutex_Unlock(&cors->waiting_mutex);
590
 _Cor_Mutex_dtor(&cors->waiting_mutex);
591
4 months ago
592
 MyAssert(cors->state == Coroutines_Stopping);
4 months ago
593
 _Cor_Mutex_Unlock(&cors->mutex);
594
 _Cor_Mutex_dtor(&cors->mutex);
9 months ago
4
595
 }
596
9 months ago
597
4 months ago
598
 Coroutine_Err Coroutine_RunSystem(Coroutine_SystemStart start, void *value)
599
 {
600
 CHECK_SYSTEM_NOT_RUNNING
601
602
 Coroutines cors;
603
 Coroutine_Err err = Coroutines_ctor(&cors);
604
 if (err){
605
 return err;
606
 }
607
 g_c = &cors;
608
 err = start(value);
609
 g_c = NULL;
610
 Coroutines_dtor(&cors);
611
 return err;
612
 }
613
614
7 months ago
615
 void Coroutine_SetStackLimit(void *limit){
4 months ago
616
 MyAssert(!limit || !g_c || !(g_c->state == Coroutines_Started || g_c->state == Coroutines_Active) || (unsigned char *)limit < (unsigned char *)g_c->tip || !g_c->tip);
5 months ago
617
 g_stack_limit = limit;
618
 if (g_c){
619
 g_c->stack_limit = limit;
620
 }
7 months ago
621
 }
622
623
4 months ago
624
 #if COROUTINE_RECORD_LOWEST_HEADROOM
625
 static size_t Coroutine_UpdateMinimumHeadroom(List_Head *list, size_t headroom)
9 months ago
4
626
 {
4 months ago
627
 for (List_Link *link = List_Begin(list); Link_NextIsLink(link); link = Link_Next(link)){
9 months ago
628
 Coroutine *cor = List_Link_Container(Coroutine, link, link);
7 months ago
629
 if (cor->guard){
6 months ago
630
 for (uintptr_t i = 4; i < cor->size-3; i += 4){
4 months ago
631
 if (!Guard_Pattern_OK(&cor->guard[i])){
4 months ago
632
 headroom = i < headroom ? i : headroom;
7 months ago
633
 break;
634
 }
9 months ago
635
 }
636
 }
637
 }
4 months ago
638
 return headroom;
639
 }
640
 #endif
641
642
643
 Coroutine_Report Coroutine_GetReport(void)
644
 {
4 months ago
645
 if (g_c){
646
 size_t headroom;
4 months ago
647
 #if COROUTINE_RECORD_LOWEST_HEADROOM
4 months ago
648
 _Cor_Mutex_Lock(&g_c->mutex);
649
 headroom = g_c->report.lowest_headroom;
650
 headroom = Coroutine_UpdateMinimumHeadroom(&g_c->inactive, headroom);
651
 headroom = Coroutine_UpdateMinimumHeadroom(&g_c->runable, headroom);
652
 headroom = Coroutine_UpdateMinimumHeadroom(&g_c->waiting, headroom);
653
 _Cor_Mutex_Unlock(&g_c->mutex);
7 months ago
654
 #else
4 months ago
655
 headroom = 0;
7 months ago
656
 #endif
4 months ago
657
 g_c->report.lowest_headroom = headroom;
9 months ago
658
4 months ago
659
 return g_c->report;
660
 } else {
661
 Coroutine_Report ret = {0, 0, 0, 0};
662
 return ret;
663
 }
4 months ago
664
 }
665
666
4 months ago
667
 #ifndef NDEBUG
668
 static void Coroutine_ReportNonEmptyList(
669
 List_Head const *head,
670
 char const *tag
671
 ){
672
 List_Link *link;
673
 for (link = List_Begin(head); Link_NextIsLink(link); link = Link_Next(link)){
674
 Coroutine *cor = List_Link_Container(Coroutine, link, link);
675
 printf("%s: %p %p %p\n", tag, cor, cor->start, cor->entry_param);
676
 }
677
 }
678
 #endif
679
4 months ago
680
 Coroutine_Err Coroutine_Run_Coroutine(
9 months ago
681
 Coroutine *cor,
9 months ago
682
 void *value
683
 ){
4 months ago
684
 CHECK_SYSTEM_RUNNING
685
 CHECK_COROUTINE_THREAD
686
 CHECK_NO_COROUTINE_RUNNING
687
9 months ago
688
 Coroutines *cors = cor->coroutines;
8 months ago
689
 _Cor_Mutex_Lock(&cors->mutex);
9 months ago
690
 cors->state = Coroutines_Active;
691
 cors->primary = cor;
9 months ago
692
4 months ago
693
 _Coroutine_Continue(cors, cor, value, true);
9 months ago
4
694
9 months ago
695
 if (!setjmp(cors->controller)){
8 months ago
696
 _Cor_Mutex_Unlock(&cors->mutex);
9 months ago
697
9 months ago
4
698
 // start the first coroutine
699
 Coroutine_RunNext();
700
 }
9 months ago
701
 // arrive here with mutex locked
4 months ago
702
 if (!List_IsEmpty(&cors->runable) || !List_IsEmpty(&cors->waiting)){
4 months ago
703
 #ifndef NDEBUG
704
 Coroutine_ReportNonEmptyList(&cors->runable, "runable");
705
 Coroutine_ReportNonEmptyList(&cors->waiting, "waiting");
4 months ago
706
 #endif
707
 return Coroutine_Err_ExitWithRunningCoroutines;
4 months ago
708
 }
4 months ago
709
 MyAssert(cors->state == Coroutines_Active);
9 months ago
710
 cors->state = Coroutines_Started;
8 months ago
711
 _Cor_Mutex_Unlock(&cors->mutex);
4 months ago
712
713
 return Coroutine_OK;
9 months ago
714
 }
715
716
4 months ago
717
 struct Coroutine_Run_Params {
718
 size_t stack;
719
 Coroutine_Start start;
720
 void *value;
721
 void **result;
722
 };
723
724
 static Coroutine_Err Coroutine_Run_Starter(void *_params)
725
 {
726
 struct Coroutine_Run_Params *params = (struct Coroutine_Run_Params *)_params;
727
728
 Coroutine *cor = Coroutine_New(params->stack, params->start);
729
 if (!cor){
730
 // that didn't work
731
 return Coroutine_Err_NoStack;
732
 }
733
 Coroutine_Err ret = Coroutine_Run_Coroutine(cor, params->value);
734
 if (!ret && params->result){
735
 *params->result = Coroutine_GetValue(cor);
736
 }
737
 Coroutine_Delete(cor);
738
 return ret;
739
 }
740
741
742
 Coroutine_Err Coroutine_Run(
6 months ago
743
 size_t stack,
9 months ago
744
 Coroutine_Start start,
6 months ago
745
 void *value,
746
 void **result
9 months ago
747
 ){
4 months ago
748
 if (!g_c){
749
 struct Coroutine_Run_Params params = {stack, start, value, result};
750
 return Coroutine_RunSystem(Coroutine_Run_Starter, &params);
751
 }
752
 if (!g_c->active)
753
 {
754
 // system running, but no active coroutine
755
 Coroutine *cor = Coroutine_New(stack, start);
756
 if (!cor){
757
 // that didn't work
758
 return Coroutine_Err_NoStack;
6 months ago
759
 }
4 months ago
760
 Coroutine_Err err = Coroutine_Run_Coroutine(cor, value);
761
 if (!err && result){
762
 *result = Coroutine_GetValue(cor);
763
 }
764
 Coroutine_Delete(cor);
765
 return err;
7 months ago
766
 }
4 months ago
767
768
 // We are in an active coroutine, so call start() directly
769
 CHECK_STACK_OVERRUN
770
 void *res = start(value);
6 months ago
771
 if (result){
4 months ago
772
 *result = res;
6 months ago
773
 }
4 months ago
774
6 months ago
775
 // no failures, so...
4 months ago
776
 return Coroutine_OK;
9 months ago
4
777
 }
778
779
6 months ago
780
 static void Coroutine_FreeToIdle(
781
 Coroutine *cor,
9 months ago
782
 Coroutine_Start start
783
 ){
4 months ago
784
 MyAssert(cor->state == Coroutine_Free);
6 months ago
785
 cor->state = Coroutine_Idle;
786
 cor->start = start;
787
 cor->value = NULL;
788
 Link_Remove(&cor->link);
789
 List_AddHead(&g_c->inactive, &cor->link);
9 months ago
790
6 months ago
791
 g_c->report.coroutines_created += 1;
792
 }
793
794
795
 static void Coroutine_FreeToIdleSize(
796
 Coroutine *cor,
797
 Coroutine_Start start,
798
 size_t size
799
 ){
4 months ago
800
 MyAssert(!cor->guard);
6 months ago
801
 cor->size = size;
802
 cor->base = (unsigned char *)cor - g_c->gap_after;
803
 cor->limit = cor->base - cor->size;
804
 Coroutine_FreeToIdle(cor, start);
805
 }
806
807
808
 static Coroutine *Coroutine_New_Lock_Assumed(
809
 size_t size,
810
 Coroutine_Start start
811
 ){
812
 List_Link *link;
813
814
 if (!g_c->tip){
815
 // no tip - time to create one
816
817
 // we're the non-Coroutine which starts the Coroutine system.
818
 // Add a single free block
819
 if (!setjmp(g_c->chunk_allocated)){
820
 ReserveStackSpace(g_c, NULL, COROUTINE_STARTUP_STACK_SIZE, NULL);
6 months ago
821
 }
6 months ago
822
 }
823
6 months ago
824
 Coroutine *cor = NULL;
6 months ago
825
 for (link = List_Begin(&g_c->free); Link_NextIsLink(link); link = Link_Next(link)){
6 months ago
826
 Coroutine *candidate = List_Link_Container(Coroutine, link, link);
4 months ago
827
 MyAssert(candidate->coroutines == g_c);
6 months ago
828
 if (!candidate->guard) {
6 months ago
829
 // this must be the tip
4 months ago
830
 MyAssert(candidate == g_c->tip);
6 months ago
831
832
 // If this is the only Coroutine in the system, go ahead and use it regardless of size.
833
 // Note: there can only be one free block if there's no other sort of blocks as we merge on free
834
 if (List_IsEmpty(&g_c->inactive) &&
835
 List_IsEmpty(&g_c->runable) &&
836
 List_IsEmpty(&g_c->waiting) ){
837
 if (g_c->stack_limit){
6 months ago
838
 size_t available = (unsigned char *)candidate - g_c->stack_limit - g_c->gap_after;
6 months ago
839
 size = available < size ? available : size;
840
 }
6 months ago
841
 Coroutine_FreeToIdleSize(candidate, start, size);
842
 return candidate;
7 months ago
843
 }
6 months ago
844
845
 // Not the only coroutine in the system - check size
846
 if (g_c->stack_limit){
847
 // there's a limit - see what that space allows....
6 months ago
848
 size_t available = (unsigned char *)candidate - g_c->stack_limit - g_c->gap_after;
6 months ago
849
850
 if (available < size){
851
 // not enough space for this coroutine
4 months ago
852
 // printf("Not enough stack space (A) %ld\n", available);
6 months ago
853
 return NULL;
854
 }
855
5 months ago
856
 if (available < size + g_c->gap_before + g_c->gap_after + COROUTINE_MINIMUM_STACK_SIZE) {
6 months ago
857
 // not enough space for another coroutine - use all the space for this one
858
 size = available;
859
 }
7 months ago
860
 }
6 months ago
861
 Coroutine_FreeToIdleSize(candidate, start, size);
862
 return candidate;
9 months ago
4
863
 }
6 months ago
864
 if (candidate->size >= size && candidate > cor){
865
 // chunk big enough, and a better choice than cor
866
 cor = candidate;
867
 }
868
 }
869
870
 if (cor){
871
 // - work out whether we're splitting or using the whole chunk
872
 if (cor->size >= size + g_c->gap_before + g_c->gap_after + COROUTINE_MINIMUM_STACK_SIZE){
873
 // enough space for a second coroutine so split this free block
874
 cor->size = size;
875
 if (!setjmp(g_c->chunk_allocated)){
876
 longjmp(cor->buf, Chunk_Split);
6 months ago
877
 }
878
 }
6 months ago
879
 // cor now ready to use
880
 Coroutine_FreeToIdle(cor, start);
881
 return cor;
9 months ago
4
882
 }
883
6 months ago
884
 // No big-enough free blocks - check if there's space beyond the tip block
885
5 months ago
886
 if (g_c->stack_limit) {
887
 ptrdiff_t available = (unsigned char *)g_c->tip->limit - g_c->gap_before - g_c->gap_after - g_c->stack_limit;
888
 if (available < (ptrdiff_t)size){
889
 // no space for a new stack block
4 months ago
890
 // printf("Not enough stack space (B) %p %zu %zu %p %ld\n", g_c->tip->limit, g_c->gap_before, g_c->gap_after, g_c->stack_limit, available);
891
 // printf("g_c->tip = %p; tip-limit = %ld; tip->size = %zu\n", g_c->tip, (unsigned char *)g_c->tip - g_c->tip->limit, g_c->tip->size);
5 months ago
892
 return NULL;
893
 }
6 months ago
894
 }
895
 Coroutine *tip = g_c->tip;
896
 Coroutine *me = g_c->active;
897
 if (tip == me) {
898
 if (!setjmp(g_c->chunk_allocated)){
899
 ReserveStackSpace(g_c, me, StackTopNow() - me->limit, NULL);
900
 }
901
 } else {
902
 if (!setjmp(g_c->chunk_allocated)){
903
 longjmp(tip->buf, Chunk_Create);
904
 }
905
 }
906
6 months ago
907
 cor = List_Link_Container(Coroutine, link, List_GetTail(&g_c->free));
4 months ago
908
 MyAssert(cor->state == Coroutine_Free);
6 months ago
909
 cor->size = size;
910
 cor->limit = (unsigned char *)cor - g_c->gap_after - size;
9 months ago
4
911
 cor->state = Coroutine_Idle;
912
 cor->start = start;
913
 cor->value = NULL;
6 months ago
914
 Link_Remove(&cor->link);
915
 List_AddHead(&g_c->inactive, &cor->link);
9 months ago
4
916
6 months ago
917
 g_c->report.coroutines_created += 1;
918
 return cor;
919
 }
9 months ago
920
6 months ago
921
922
 Coroutine *Coroutine_New(
923
 size_t stack,
924
 Coroutine_Start start
925
 ){
4 months ago
926
 MyAssert(g_c);
927
 MyAssert((g_c->state == Coroutines_Started && List_IsEmpty(&g_c->inactive)) || g_c->state == Coroutines_Active);
928
 MyAssert(!Coroutine_StackHasOverrun());
6 months ago
929
930
 _Cor_Mutex_Lock(&g_c->mutex);
931
932
 Coroutine *cor = Coroutine_New_Lock_Assumed(stack, start);
933
934
 if (cor && cor->size > g_c->report.largest_stack){
935
 g_c->report.largest_stack = cor->size;
936
 }
937
938
 _Cor_Mutex_Unlock(&g_c->mutex);
939
9 months ago
4
940
 return cor;
941
 }
942
9 months ago
943
944
 void Coroutine_Delete(
945
 Coroutine *cor
946
 ){
4 months ago
947
 MyAssert(!Coroutine_StackHasOverrun());
6 months ago
948
 if (cor){
949
 Coroutines *cors = cor->coroutines;
950
 _Cor_Mutex_Lock(&cors->mutex);
4 months ago
951
 MyAssert(cor->state == Coroutine_Idle || cor->state == Coroutine_Complete);
4 months ago
952
953
 #if COROUTINE_RECORD_LOWEST_HEADROOM
954
 if (cor->guard){
955
 unsigned char *base = cor->base;
956
 unsigned char *rover;
957
 for (rover = cor->limit+4; rover<base; rover += 4){
4 months ago
958
 if (!Guard_Pattern_OK(rover)){
4 months ago
959
 break;
960
 }
961
 }
962
 size_t myheadroom = (size_t)(rover - cor->limit);
963
 if (myheadroom < g_c->report.lowest_headroom || g_c->report.lowest_headroom == 0){
964
 g_c->report.lowest_headroom = myheadroom;
965
 }
966
 }
967
 #endif
968
6 months ago
969
 cor->state = Coroutine_Free;
6 months ago
970
 Link_Remove(&cor->link);
971
6 months ago
972
 // insert into free list
973
 List_AddHead(&cors->free, &cor->link);
6 months ago
974
975
 // Check for merge with following Coroutine
6 months ago
976
 List_Link *link = Link_Next(&cor->all_link);
6 months ago
977
 if (Link_NextIsLink(link)){
6 months ago
978
 Coroutine *listcor = List_Link_Container(Coroutine, all_link, link);
979
 if (listcor->state == Coroutine_Free){
6 months ago
980
 // merge
6 months ago
981
 cor->size += cor->limit - listcor->limit;
6 months ago
982
 cor->limit = listcor->limit;
983
 cor->guard = listcor->guard;
6 months ago
984
 Link_Remove(&listcor->all_link);
6 months ago
985
 Link_Remove(&listcor->link);
6 months ago
986
 if (g_c->tip == listcor){
987
 g_c->tip = cor;
988
 }
6 months ago
989
 }
990
 }
991
992
 // check for merge with prev coroutine
6 months ago
993
 link = Link_Prev(&cor->all_link);
6 months ago
994
 if (Link_PrevIsLink(link)){
6 months ago
995
 Coroutine *listcor = List_Link_Container(Coroutine, all_link, link);
996
 if (listcor->state == Coroutine_Free){
6 months ago
997
 // merge
6 months ago
998
 listcor->size += listcor->limit - cor->limit;
6 months ago
999
 listcor->limit = cor->limit;
1000
 listcor->guard = cor->guard;
6 months ago
1001
 Link_Remove(&cor->all_link);
6 months ago
1002
 Link_Remove(&cor->link);
6 months ago
1003
 if (g_c->tip == cor){
1004
 g_c->tip = listcor;
1005
 }
6 months ago
1006
 }
1007
 }
1008
6 months ago
1009
 _Cor_Mutex_Unlock(&cors->mutex);
1010
 }
9 months ago
4
1011
 }
1012
9 months ago
1013
8 months ago
1014
 // Coroutine_Continue, assuming the mutex is claimed
4 months ago
1015
 // return false for success, true for something went wrong
4 months ago
1016
 static Coroutine_Err _Coroutine_Continue(
4 months ago
1017
 Coroutines *cors,
9 months ago
1018
 Coroutine *cor,
1019
 void *value,
1020
 bool early
1021
 ){
4 months ago
1022
 if (cor->state == Coroutine_Running){
1023
 // already running
4 months ago
1024
 return Coroutine_OK;
4 months ago
1025
 }
4 months ago
1026
 if (cor->state != Coroutine_Idle && cor->state != Coroutine_Waiting){
1027
 return Coroutine_Err_WrongState;
1028
 }
9 months ago
4
1029
 cor->entry_param = value;
1030
 cor->state = Coroutine_Running;
6 months ago
1031
 Link_Remove(&cor->link);
9 months ago
4
1032
 if ( early ) {
9 months ago
1033
 List_AddHead(&cors->runable, &cor->link);
9 months ago
4
1034
 } else {
9 months ago
1035
 List_AddTail(&cors->runable, &cor->link);
9 months ago
4
1036
 }
8 months ago
1037
 _Cor_Mutex_Unlock(&cors->waiting_mutex);
4 months ago
1038
 return Coroutine_OK;
8 months ago
1039
 }
1040
1041
4 months ago
1042
 Coroutine_Err Coroutine_Continue(
8 months ago
1043
 Coroutine *cor,
1044
 void *value,
1045
 bool early
1046
 ){
4 months ago
1047
 MyAssert(!Coroutine_StackHasOverrun());
8 months ago
1048
 Coroutines *cors = cor->coroutines;
8 months ago
1049
 _Cor_Mutex_Lock(&cors->mutex);
4 months ago
1050
 Coroutine_Err err = _Coroutine_Continue(cors, cor, value, early);
8 months ago
1051
 _Cor_Mutex_Unlock(&cors->mutex);
4 months ago
1052
 return err;
9 months ago
4
1053
 }
1054
9 months ago
1055
1056
 void *Coroutine_Yield(
1057
 void *value,
1058
 Coroutine_YieldCallback on_yield,
9 months ago
1059
 void *yield_me
9 months ago
1060
 ){
4 months ago
1061
 MyAssert(g_c);
6 months ago
1062
 Coroutine *me = g_c->active;
4 months ago
1063
 MyAssert(me);
1064
 MyAssert(!Coroutine_StackHasOverrun());
9 months ago
1065
6 months ago
1066
 _Cor_Mutex_Lock(&g_c->mutex);
9 months ago
1067
 Coroutines *cors = me->coroutines;
4 months ago
1068
 MyAssert(me && me->state == Coroutine_Running && cors == g_c);
7 months ago
1069
 me->stack_top = StackTopNow();
9 months ago
4
1070
 me->value = value;
1071
 me->state = Coroutine_Waiting;
9 months ago
1072
6 months ago
1073
 Link_Remove(&me->link);
8 months ago
1074
 if (!List_IsEmpty(&cors->runable)){
8 months ago
1075
 _Cor_Mutex_Unlock(&cors->waiting_mutex);
8 months ago
1076
 }
9 months ago
1077
 List_AddTail(&cors->waiting, &me->link);
9 months ago
1078
9 months ago
1079
 switch (setjmp(me->buf)){
1080
 case Chunk_Initial:
8 months ago
1081
 _Cor_Mutex_Unlock(&cors->mutex);
9 months ago
1082
 on_yield(yield_me);
9 months ago
4
1083
 Coroutine_RunNext();
4 months ago
1084
 MyAssert(false);
3 months ago
1085
 break;
9 months ago
1086
 case Chunk_Create:
4 months ago
1087
 MyAssert(me == g_c->tip);
6 months ago
1088
 ReserveStackSpace(me->coroutines, me, me->stack_top - me->limit, NULL);
4 months ago
1089
 MyAssert(false);
3 months ago
1090
 break;
9 months ago
1091
 case Chunk_Enter:
1092
 // arrive here with mutex locked
9 months ago
1093
 cors->active = me;
4 months ago
1094
 MyAssert(!Coroutine_StackHasOverrun());
9 months ago
1095
 // when we return here - we are running again
4 months ago
1096
 MyAssert(me->state == Coroutine_Running);
9 months ago
1097
 void *res = me->entry_param;
8 months ago
1098
 _Cor_Mutex_Unlock(&cors->mutex);
9 months ago
1099
 return res;
9 months ago
4
1100
 }
3 months ago
1101
 MyAssert(false);
9 months ago
1102
 return NULL;
9 months ago
4
1103
 }
1104
9 months ago
1105
1106
 void *Coroutine_GetValue(
1107
 Coroutine *cor
1108
 ){
9 months ago
4
1109
 return cor->value;
1110
 }
1111
9 months ago
1112
8 months ago
1113
 Coroutine *Coroutine_GetActive(void)
9 months ago
4
1114
 {
6 months ago
1115
 return g_c ? g_c->active : NULL;
9 months ago
4
1116
 }
1117
9 months ago
1118
8 months ago
1119
 intptr_t Coroutine_GetStackHeadroom(void){
4 months ago
1120
 Coroutine *me = g_c ? g_c->active : NULL;
7 months ago
1121
 if (!me){
1122
 // no active coroutine
4 months ago
1123
 if (g_stack_limit){
1124
 return StackTopNow() - g_stack_limit;
7 months ago
1125
 } else {
1126
 // no information where the stack ends - return something
6 months ago
1127
 return COROUTINE_MINIMUM_STACK_SIZE;
7 months ago
1128
 }
1129
 }
6 months ago
1130
 return StackTopNow() - me->limit;
9 months ago
1131
 }
1132
1133
7 months ago
1134
 // This is used to avoid compiler warnings about returning the address of a local
1135
 static inline void *StopAddressWarnings(void *p)
1136
 {
1137
 return p;
9 months ago
1138
 }
1139
1140
7 months ago
1141
 void *Coroutine_GetStackHWM(void){
4 months ago
1142
 MyAssert(g_c);
1143
 MyAssert(g_c->state == Coroutines_Active);
1144
 MyAssert(!Coroutine_StackHasOverrun());
7 months ago
1145
 // Find where the guards end
1146
 unsigned char *guard;
3 months ago
1147
 for (guard = g_c->active->limit; Guard_Pattern_OK(guard); guard += 4){
7 months ago
1148
 // do nothing
1149
 }
1150
 return guard;
1151
 }
8 months ago
1152
1153
7 months ago
1154
 void Coroutine_ClearStackForHWM(void){
4 months ago
1155
 MyAssert(g_c);
1156
 MyAssert(g_c->state == Coroutines_Active);
1157
 MyAssert(!Coroutine_StackHasOverrun());
7 months ago
1158
 unsigned char *end = StackTopNow() - GUARD_PATTERN_SIZE;
3 months ago
1159
 for (unsigned char *guard = g_c->active->limit; guard <= end; guard += GUARD_PATTERN_SIZE){
7 months ago
1160
 Apply_Guard(guard);
7 months ago
1161
 }
1162
 }
1163
1164
6 months ago
1165
 static bool Coroutine_CanStartCoroutine_Lock_Assumed(
1166
 size_t size
1167
 ){
1168
 if (!g_c->stack_limit){
7 months ago
1169
 return true;
1170
 }
7 months ago
1171
6 months ago
1172
 if (!g_c->tip){
1173
 return true;
1174
 }
1175
1176
 if (g_c->tip->state == Coroutine_Free){
1177
 // last block is free
1178
 if ((unsigned char *)g_c->tip - g_c->stack_limit >= (ptrdiff_t)(g_c->gap_after + size)){
1179
 // enough room in free block, which is the last block
1180
 return true;
1181
 }
1182
 } else {
1183
 // last block is allocated
1184
 if (g_c->tip->limit - g_c->stack_limit >= (ptrdiff_t)(g_c->gap_before + g_c->gap_after + size)){
1185
 // enough room after the last block, which is allocated
1186
 return true;
1187
 }
1188
 }
1189
1190
 // not enough room between allocated blocks and stack limit, so check free list
1191
 List_Link *link;
1192
 for (link = List_Begin(&g_c->free); Link_NextIsLink(link); link = Link_Next(link)){
1193
 Coroutine *cor = List_Link_Container(Coroutine, link, link);
1194
 if (cor->size >= size){
1195
 return true;
1196
 }
1197
 }
1198
1199
 return false;
7 months ago
1200
 }
1201
1202
6 months ago
1203
 bool Coroutine_CanStartCoroutine(
1204
 size_t size
1205
 ){
4 months ago
1206
 MyAssert(g_c);
1207
 MyAssert(g_c->state == Coroutines_Started || g_c->state == Coroutines_Active);
1208
 MyAssert(!Coroutine_StackHasOverrun());
4 months ago
1209
6 months ago
1210
 _Cor_Mutex_Lock(&g_c->mutex);
1211
1212
 bool result = Coroutine_CanStartCoroutine_Lock_Assumed(size);
1213
1214
 _Cor_Mutex_Unlock(&g_c->mutex);
1215
1216
 return result;
1217
 }
1218
8 months ago
1219
 void *Coroutine_GetCStackTop(void){
4 months ago
1220
 MyAssert(!Coroutine_StackHasOverrun());
6 months ago
1221
 if ((g_c->state == Coroutines_Started || g_c->state == Coroutines_Active) && g_c->tip != g_c->active) {
1222
 return g_c->tip->stack_top;
7 months ago
1223
 } else {
1224
 return StackTopNow();
1225
 }
9 months ago
1226
 }
1227
1228
7 months ago
1229
 static unsigned char *StackTopNow(void){
7 months ago
1230
 unsigned char here[4];
1231
 return StopAddressWarnings(here);
1232
 }
1233
1234
9 months ago
1235
 struct Coroutine_ChainParam {
1236
 Coroutine_Start start;
1237
 void *value;
1238
 Coroutine *ret;
1239
 };
1240
1241
1242
 static void *Coroutine_ChainFn(
1243
 void *param
1244
 ){
1245
 struct Coroutine_ChainParam *params = (struct Coroutine_ChainParam *)param;
4 months ago
1246
 return (void *)(uintptr_t)Coroutine_Continue(params->ret, params->start(params->value), true);
9 months ago
1247
 }
1248
1249
1250
 static void Coroutine_ChainYield(
1251
 void *unused
1252
 ){
1253
 (void)unused;
1254
 }
1255
1256
4 months ago
1257
 Coroutine_Err Coroutine_Chain(
6 months ago
1258
 size_t size,
9 months ago
1259
 Coroutine_Start start,
6 months ago
1260
 void *value,
1261
 void **result
9 months ago
1262
 ){
4 months ago
1263
 MyAssert(!Coroutine_StackHasOverrun());
6 months ago
1264
 Coroutine *cor = Coroutine_New(size, Coroutine_ChainFn);
6 months ago
1265
 if (!cor){
1266
 // failed
4 months ago
1267
 return Coroutine_Err_NoStack;
6 months ago
1268
 }
9 months ago
1269
 struct Coroutine_ChainParam params = {
1270
 start,
1271
 value,
1272
 Coroutine_GetActive()
1273
 };
4 months ago
1274
 Coroutine_Err err = Coroutine_Continue(cor, &params, true);
1275
 if (err){
1276
 return err;
1277
 }
9 months ago
1278
 void *res = Coroutine_Yield(NULL, Coroutine_ChainYield, NULL);
4 months ago
1279
 err = (Coroutine_Err)(uintptr_t)Coroutine_GetValue(cor);
9 months ago
1280
 Coroutine_Delete(cor);
4 months ago
1281
 if (!err && result){
6 months ago
1282
 *result = res;
1283
 }
4 months ago
1284
 // success! ...probably
1285
 return err;
9 months ago
1286
 }
1287
1288
9 months ago
1289
 bool Coroutine_IsRunning(
1290
 Coroutine *cor
1291
 )
9 months ago
4
1292
 {
9 months ago
1293
 int state = cor->state;
1294
 return state == Coroutine_Running || state == Coroutine_Waiting;
9 months ago
4
1295
 }
9 months ago
1296
1297
7 months ago
1298
 bool Coroutine_IsComplete(
1299
 Coroutine *cor
1300
 )
1301
 {
1302
 int state = cor->state;
1303
 return state == Coroutine_Complete;
1304
 }
1305
1306
8 months ago
1307
 bool Coroutine_IsStarted(void){
6 months ago
1308
 return g_c && (g_c->state == Coroutines_Active || g_c->state == Coroutines_Started);
9 months ago
1309
 }
6 months ago
1310
1311
 void _Coroutine_Dump(void){
1312
 char *state_to_text[] = {
1313
 "Free",
1314
 "Idle",
1315
 "Running",
1316
 "Waiting",
1317
 "Complete"
1318
 };
1319
 unsigned idx = 0;
1320
 List_Link *link;
1321
 for (link = List_Begin(&g_c->all); Link_NextIsLink(link); link = Link_Next(link)){
1322
 Coroutine *cor = List_Link_Container(Coroutine, all_link, link);
1323
 printf("%d) %p (%s) %ld%s\n", idx++, cor, state_to_text[cor->state], cor->size, cor == g_c->tip ? " (TIP)" : "");
1324
 }
1325
 }
1326