Fix a memleak with win32 threads: the handle returned by _beginthreadex
[libav.git] / libavcodec / w32thread.c
1 /*
2 * Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20 //#define DEBUG
21
22 #include "avcodec.h"
23
24 #define WIN32_LEAN_AND_MEAN
25 #include <windows.h>
26 #include <process.h>
27
28 typedef struct ThreadContext{
29 AVCodecContext *avctx;
30 HANDLE thread;
31 HANDLE work_sem;
32 HANDLE done_sem;
33 int (*func)(AVCodecContext *c, void *arg);
34 void *arg;
35 int ret;
36 }ThreadContext;
37
38
39 static unsigned WINAPI attribute_align_arg thread_func(void *v){
40 ThreadContext *c= v;
41
42 for(;;){
43 //printf("thread_func %X enter wait\n", (int)v); fflush(stdout);
44 WaitForSingleObject(c->work_sem, INFINITE);
45 //printf("thread_func %X after wait (func=%X)\n", (int)v, (int)c->func); fflush(stdout);
46 if(c->func)
47 c->ret= c->func(c->avctx, c->arg);
48 else
49 return 0;
50 //printf("thread_func %X signal complete\n", (int)v); fflush(stdout);
51 ReleaseSemaphore(c->done_sem, 1, 0);
52 }
53
54 return 0;
55 }
56
57 /**
58 * Free what has been allocated by avcodec_thread_init().
59 * Must be called after decoding has finished, especially do not call while avcodec_thread_execute() is running.
60 */
61 void avcodec_thread_free(AVCodecContext *s){
62 ThreadContext *c= s->thread_opaque;
63 int i;
64
65 for(i=0; i<s->thread_count; i++){
66
67 c[i].func= NULL;
68 ReleaseSemaphore(c[i].work_sem, 1, 0);
69 WaitForSingleObject(c[i].thread, INFINITE);
70 if(c[i].work_sem) CloseHandle(c[i].work_sem);
71 if(c[i].done_sem) CloseHandle(c[i].done_sem);
72 if(c[i].thread) CloseHandle(c[i].thread);
73 }
74
75 av_freep(&s->thread_opaque);
76 }
77
78 int avcodec_thread_execute(AVCodecContext *s, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){
79 ThreadContext *c= s->thread_opaque;
80 int i;
81
82 assert(s == c->avctx);
83 assert(count <= s->thread_count);
84
85 /* note, we can be certain that this is not called with the same AVCodecContext by different threads at the same time */
86
87 for(i=0; i<count; i++){
88 c[i].arg= (char*)arg + i*size;
89 c[i].func= func;
90 c[i].ret= 12345;
91
92 ReleaseSemaphore(c[i].work_sem, 1, 0);
93 }
94 for(i=0; i<count; i++){
95 WaitForSingleObject(c[i].done_sem, INFINITE);
96
97 c[i].func= NULL;
98 if(ret) ret[i]= c[i].ret;
99 }
100 return 0;
101 }
102
103 int avcodec_thread_init(AVCodecContext *s, int thread_count){
104 int i;
105 ThreadContext *c;
106 uint32_t threadid;
107
108 s->thread_count= thread_count;
109
110 assert(!s->thread_opaque);
111 c= av_mallocz(sizeof(ThreadContext)*thread_count);
112 s->thread_opaque= c;
113
114 for(i=0; i<thread_count; i++){
115 //printf("init semaphors %d\n", i); fflush(stdout);
116 c[i].avctx= s;
117
118 if(!(c[i].work_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
119 goto fail;
120 if(!(c[i].done_sem = CreateSemaphore(NULL, 0, s->thread_count, NULL)))
121 goto fail;
122
123 //printf("create thread %d\n", i); fflush(stdout);
124 c[i].thread = (HANDLE)_beginthreadex(NULL, 0, thread_func, &c[i], 0, &threadid );
125 if( !c[i].thread ) goto fail;
126 }
127 //printf("init done\n"); fflush(stdout);
128
129 s->execute= avcodec_thread_execute;
130
131 return 0;
132 fail:
133 avcodec_thread_free(s);
134 return -1;
135 }