summaryrefslogtreecommitdiff
path: root/scheduler.c
blob: 06658356b176e9012f1127daf9293adc6b89f3bb (plain)
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
/**********************************************************************

  scheduler.c

  $Author$

  Copyright (C) 2020 Samuel Grant Dawson Williams

**********************************************************************/

#include "vm_core.h"
#include "ruby/fiber/scheduler.h"
#include "ruby/io.h"
#include "ruby/io/buffer.h"

#include "internal/thread.h"

static ID id_close;
static ID id_scheduler_close;

static ID id_block;
static ID id_unblock;

static ID id_timeout_after;
static ID id_kernel_sleep;
static ID id_process_wait;

static ID id_io_read, id_io_pread;
static ID id_io_write, id_io_pwrite;
static ID id_io_wait;
static ID id_io_close;

static ID id_address_resolve;

void
Init_Fiber_Scheduler(void)
{
    id_close = rb_intern_const("close");
    id_scheduler_close = rb_intern_const("scheduler_close");

    id_block = rb_intern_const("block");
    id_unblock = rb_intern_const("unblock");

    id_timeout_after = rb_intern_const("timeout_after");
    id_kernel_sleep = rb_intern_const("kernel_sleep");
    id_process_wait = rb_intern_const("process_wait");

    id_io_read = rb_intern_const("io_read");
    id_io_pread = rb_intern_const("io_pread");
    id_io_write = rb_intern_const("io_write");
    id_io_pwrite = rb_intern_const("io_pwrite");

    id_io_wait = rb_intern_const("io_wait");
    id_io_close = rb_intern_const("io_close");

    id_address_resolve = rb_intern_const("address_resolve");
}

VALUE
rb_fiber_scheduler_get(void)
{
    VM_ASSERT(ruby_thread_has_gvl_p());

    rb_thread_t *thread = GET_THREAD();
    VM_ASSERT(thread);

    return thread->scheduler;
}

static void
verify_interface(VALUE scheduler)
{
    if (!rb_respond_to(scheduler, id_block)) {
        rb_raise(rb_eArgError, "Scheduler must implement #block");
    }

    if (!rb_respond_to(scheduler, id_unblock)) {
        rb_raise(rb_eArgError, "Scheduler must implement #unblock");
    }

    if (!rb_respond_to(scheduler, id_kernel_sleep)) {
        rb_raise(rb_eArgError, "Scheduler must implement #kernel_sleep");
    }

    if (!rb_respond_to(scheduler, id_io_wait)) {
        rb_raise(rb_eArgError, "Scheduler must implement #io_wait");
    }
}

VALUE
rb_fiber_scheduler_set(VALUE scheduler)
{
    VM_ASSERT(ruby_thread_has_gvl_p());

    rb_thread_t *thread = GET_THREAD();
    VM_ASSERT(thread);

    if (scheduler != Qnil) {
        verify_interface(scheduler);
    }

    // We invoke Scheduler#close when setting it to something else, to ensure the previous scheduler runs to completion before changing the scheduler. That way, we do not need to consider interactions, e.g., of a Fiber from the previous scheduler with the new scheduler.
    if (thread->scheduler != Qnil) {
        rb_fiber_scheduler_close(thread->scheduler);
    }

    thread->scheduler = scheduler;

    return thread->scheduler;
}

static VALUE
rb_fiber_scheduler_current_for_threadptr(rb_thread_t *thread)
{
    VM_ASSERT(thread);

    if (thread->blocking == 0) {
        return thread->scheduler;
    }
    else {
        return Qnil;
    }
}

VALUE
rb_fiber_scheduler_current(void)
{
    return rb_fiber_scheduler_current_for_threadptr(GET_THREAD());
}

VALUE rb_fiber_scheduler_current_for_thread(VALUE thread)
{
    return rb_fiber_scheduler_current_for_threadptr(rb_thread_ptr(thread));
}

VALUE
rb_fiber_scheduler_close(VALUE scheduler)
{
    VM_ASSERT(ruby_thread_has_gvl_p());

    VALUE result;

    result = rb_check_funcall(scheduler, id_scheduler_close, 0, NULL);
    if (result != Qundef) return result;

    result = rb_check_funcall(scheduler, id_close, 0, NULL);
    if (result != Qundef) return result;

    return Qnil;
}

VALUE
rb_fiber_scheduler_make_timeout(struct timeval *timeout)
{
    if (timeout) {
        return rb_float_new((double)timeout->tv_sec + (0.000001f * timeout->tv_usec));
    }

    return Qnil;
}

VALUE
rb_fiber_scheduler_kernel_sleep(VALUE scheduler, VALUE timeout)
{
    return rb_funcall(scheduler, id_kernel_sleep, 1, timeout);
}

VALUE
rb_fiber_scheduler_kernel_sleepv(VALUE scheduler, int argc, VALUE * argv)
{
    return rb_funcallv(scheduler, id_kernel_sleep, argc, argv);
}

#if 0
VALUE
rb_fiber_scheduler_timeout_after(VALUE scheduler, VALUE timeout, VALUE exception, VALUE message)
{
    VALUE arguments[] = {
        timeout, exception, message
    };

    return rb_check_funcall(scheduler, id_timeout_after, 3, arguments);
}

VALUE
rb_fiber_scheduler_timeout_afterv(VALUE scheduler, int argc, VALUE * argv)
{
    return rb_check_funcall(scheduler, id_timeout_after, argc, argv);
}
#endif

VALUE
rb_fiber_scheduler_process_wait(VALUE scheduler, rb_pid_t pid, int flags)
{
    VALUE arguments[] = {
        PIDT2NUM(pid), RB_INT2NUM(flags)
    };

    return rb_check_funcall(scheduler, id_process_wait, 2, arguments);
}

VALUE
rb_fiber_scheduler_block(VALUE scheduler, VALUE blocker, VALUE timeout)
{
    return rb_funcall(scheduler, id_block, 2, blocker, timeout);
}

VALUE
rb_fiber_scheduler_unblock(VALUE scheduler, VALUE blocker, VALUE fiber)
{
    VM_ASSERT(rb_obj_is_fiber(fiber));

    return rb_funcall(scheduler, id_unblock, 2, blocker, fiber);
}

VALUE
rb_fiber_scheduler_io_wait(VALUE scheduler, VALUE io, VALUE events, VALUE timeout)
{
    return rb_funcall(scheduler, id_io_wait, 3, io, events, timeout);
}

VALUE
rb_fiber_scheduler_io_wait_readable(VALUE scheduler, VALUE io)
{
    return rb_fiber_scheduler_io_wait(scheduler, io, RB_UINT2NUM(RUBY_IO_READABLE), Qnil);
}

VALUE
rb_fiber_scheduler_io_wait_writable(VALUE scheduler, VALUE io)
{
    return rb_fiber_scheduler_io_wait(scheduler, io, RB_UINT2NUM(RUBY_IO_WRITABLE), Qnil);
}

VALUE
rb_fiber_scheduler_io_read(VALUE scheduler, VALUE io, VALUE buffer, size_t length)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(length)
    };

    return rb_check_funcall(scheduler, id_io_read, 3, arguments);
}

VALUE
rb_fiber_scheduler_io_pread(VALUE scheduler, VALUE io, VALUE buffer, size_t length, off_t offset)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(length), OFFT2NUM(offset)
    };

    return rb_check_funcall(scheduler, id_io_pread, 4, arguments);
}

VALUE
rb_fiber_scheduler_io_write(VALUE scheduler, VALUE io, VALUE buffer, size_t length)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(length)
    };

    return rb_check_funcall(scheduler, id_io_write, 3, arguments);
}

VALUE
rb_fiber_scheduler_io_pwrite(VALUE scheduler, VALUE io, VALUE buffer, size_t length, off_t offset)
{
    VALUE arguments[] = {
        io, buffer, SIZET2NUM(length), OFFT2NUM(offset)
    };

    return rb_check_funcall(scheduler, id_io_pwrite, 4, arguments);
}

VALUE
rb_fiber_scheduler_io_read_memory(VALUE scheduler, VALUE io, void *base, size_t size, size_t length)
{
    VALUE buffer = rb_io_buffer_new(base, size, RB_IO_BUFFER_LOCKED);

    VALUE result = rb_fiber_scheduler_io_read(scheduler, io, buffer, length);

    rb_io_buffer_unlock(buffer);
    rb_io_buffer_free(buffer);

    return result;
}

VALUE
rb_fiber_scheduler_io_write_memory(VALUE scheduler, VALUE io, const void *base, size_t size, size_t length)
{
    VALUE buffer = rb_io_buffer_new((void*)base, size, RB_IO_BUFFER_LOCKED|RB_IO_BUFFER_READONLY);

    VALUE result = rb_fiber_scheduler_io_write(scheduler, io, buffer, length);

    rb_io_buffer_unlock(buffer);
    rb_io_buffer_free(buffer);

    return result;
}

VALUE
rb_fiber_scheduler_io_close(VALUE scheduler, VALUE io)
{
    VALUE arguments[] = {io};

    return rb_check_funcall(scheduler, id_io_close, 1, arguments);
}

VALUE
rb_fiber_scheduler_address_resolve(VALUE scheduler, VALUE hostname)
{
    VALUE arguments[] = {
        hostname
    };

    return rb_check_funcall(scheduler, id_address_resolve, 1, arguments);
}