1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2024 Olaf Wintermann. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "threadpool.h"
30 #include "context.h"
31
32 #ifndef _WIN32
33
34 #include <pthread.h>
35 #include <stdio.h>
36 #include <string.h>
37 #include <errno.h>
38
39 static threadpool_job kill_job;
40
41 UiThreadpool* threadpool_new(int min, int max) {
42 UiThreadpool *pool = malloc(sizeof(UiThreadpool));
43 pool->queue = NULL;
44 pool->queue_len = 0;
45 pool->num_idle = 0;
46 pool->min_threads = min;
47 pool->max_threads = max;
48
49 pthread_mutex_init(&pool->queue_lock, NULL);
50 pthread_mutex_init(&pool->avlbl_lock, NULL);
51 pthread_cond_init(&pool->available, NULL);
52
53 return pool;
54 }
55
56 int threadpool_start(UiThreadpool *pool) {
57 /* create pool threads */
58 for(int i=0;i<pool->min_threads;i++) {
59 pthread_t t;
60 if (pthread_create(&t, NULL, threadpool_func, pool) != 0) {
61 fprintf(stderr, "uic: threadpool_start: pthread_create failed: %s", strerror(errno));
62 return 1;
63 }
64 }
65 return 0;
66 }
67
68 void* threadpool_func(void *data) {
69 UiThreadpool *pool = (UiThreadpool*)data;
70
71 for(;;) {
72 threadpool_job *job = threadpool_get_job(pool);
73 if(job == &kill_job) {
74 break;
75 }
76
77 job->callback(job->data);
78
79 free(job);
80 }
81 return NULL;
82 }
83
84 threadpool_job* threadpool_get_job(UiThreadpool *pool) {
85 pthread_mutex_lock(&pool->queue_lock);
86
87 threadpool_job *job = NULL;
88 pool->num_idle++;
89 while(job == NULL) {
90 if(pool->queue_len == 0) {
91 pthread_cond_wait(&pool->available, &pool->queue_lock);
92 continue;
93 } else {
94 pool_queue_t *q = pool->queue;
95 job = q->job;
96 pool->queue = q->next;
97 pool->queue_len--;
98 free(q);
99 }
100 }
101 pool->num_idle--;
102
103 pthread_mutex_unlock(&pool->queue_lock);
104 return job;
105 }
106
107 void threadpool_run(UiThreadpool *pool, job_callback_f func, void *data) {
108 // TODO: handle errors
109
110 threadpool_job *job = malloc(sizeof(threadpool_job));
111 job->callback = func;
112 job->data = data;
113
114 pthread_mutex_lock(&pool->queue_lock);
115 threadpool_enqueue_job(pool, job);
116
117 int create_thread = 0;
118 int destroy_thread = 0;
119 int diff = pool->queue_len - pool->num_idle;
120
121 //if(pool->queue_len == 1) {
122 pthread_cond_signal(&pool->available);
123 //}
124
125 pthread_mutex_unlock(&pool->queue_lock);
126 }
127
128 void threadpool_enqueue_job(UiThreadpool *pool, threadpool_job *job) {
129 pool_queue_t *q = malloc(sizeof(pool_queue_t));
130 q->job = job;
131 q->next = NULL;
132
133 if(pool->queue == NULL) {
134 pool->queue = q;
135 } else {
136 pool_queue_t *last_elem = pool->queue;
137 while(last_elem->next != NULL) {
138 last_elem = last_elem->next;
139 }
140 last_elem->next = q;
141 }
142 pool->queue_len++;
143 }
144
145
146
147
148
149
150 UiThreadpool* ui_threadpool_create(int nthreads) {
151 UiThreadpool *pool = threadpool_new(nthreads, nthreads);
152 threadpool_start(pool); // TODO: check return value
153 return pool;
154 }
155
156 void ui_threadpool_destroy(UiThreadpool* pool) {
157
158 }
159
160 static int ui_threadpool_job_finish(void *data) {
161 UiJob *job = data;
162 UiEvent event;
163 event.obj = job->obj;
164 event.window = job->obj->window;
165 event.document = job->obj->ctx->document;
166 event.intval = 0;
167 event.eventdata = NULL;
168 job->finish_callback(&event, job->finish_data);
169 free(job);
170 return 0;
171 }
172
173 static void* ui_threadpool_job_func(void *data) {
174 UiJob *job = data;
175 if (!job->job_func(job->job_data) && job->finish_callback) {
176 ui_call_mainthread(ui_threadpool_job_finish, job);
177 } else {
178 free(job);
179 }
180 return NULL;
181 }
182
183 void ui_threadpool_job(UiThreadpool* pool, UiObject* obj, ui_threadfunc tf, void* td, ui_callback f, void* fd) {
184 UiJob* job = malloc(sizeof(UiJob));
185 job->obj = obj;
186 job->job_func = tf;
187 job->job_data = td;
188 job->finish_callback = f;
189 job->finish_data = fd;
190 threadpool_run(pool, ui_threadpool_job_func, job);
191 }
192
193
194 #endif
195
196