code.delx.au - pulseaudio/blob - src/pulsecore/thread-win32.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   5
   6   PulseAudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU Lesser General Public License as published
   8   by the Free Software Foundation; either version 2.1 of the License,
   9   or (at your option) any later version.
  10
  11   PulseAudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with PulseAudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27
  28 #include <windows.h>
  29
  30 #include <pulse/xmalloc.h>
  31 #include <pulsecore/once.h>
  32
  33 #include "thread.h"
  34
  35 struct pa_thread {
  36     HANDLE thread;
  37     pa_thread_func_t thread_func;
  38     void *userdata;
  39 };
  40
  41 struct pa_tls {
  42     DWORD index;
  43     pa_free_cb_t free_func;
  44 };
  45
  46 struct pa_tls_monitor {
  47     HANDLE thread;
  48     pa_free_cb_t free_func;
  49     void *data;
  50 };
  51
  52 static pa_tls *thread_tls;
  53 static pa_once thread_tls_once = PA_ONCE_INIT;
  54 static pa_tls *monitor_tls;
  55
  56 static void thread_tls_once_func(void) {
  57     thread_tls = pa_tls_new(NULL);
  58     assert(thread_tls);
  59 }
  60
  61 static DWORD WINAPI internal_thread_func(LPVOID param) {
  62     pa_thread *t = param;
  63     assert(t);
  64
  65     pa_run_once(&thread_tls_once, thread_tls_once_func);
  66     pa_tls_set(thread_tls, t);
  67
  68     t->thread_func(t->userdata);
  69
  70     return 0;
  71 }
  72
  73 pa_thread* pa_thread_new(const char *name, pa_thread_func_t thread_func, void *userdata) {
  74     pa_thread *t;
  75     DWORD thread_id;
  76
  77     assert(thread_func);
  78
  79     t = pa_xnew(pa_thread, 1);
  80     t->thread_func = thread_func;
  81     t->userdata = userdata;
  82
  83     t->thread = CreateThread(NULL, 0, internal_thread_func, t, 0, &thread_id);
  84
  85     if (!t->thread) {
  86         pa_xfree(t);
  87         return NULL;
  88     }
  89
  90     return t;
  91 }
  92
  93 int pa_thread_is_running(pa_thread *t) {
  94     DWORD code;
  95
  96     assert(t);
  97
  98     if (!GetExitCodeThread(t->thread, &code))
  99         return 0;
 100
 101     return code == STILL_ACTIVE;
 102 }
 103
 104 void pa_thread_free(pa_thread *t) {
 105     assert(t);
 106
 107     pa_thread_join(t);
 108     CloseHandle(t->thread);
 109     pa_xfree(t);
 110 }
 111
 112 int pa_thread_join(pa_thread *t) {
 113     assert(t);
 114
 115     if (WaitForSingleObject(t->thread, INFINITE) == WAIT_FAILED)
 116         return -1;
 117
 118     return 0;
 119 }
 120
 121 pa_thread* pa_thread_self(void) {
 122     pa_run_once(&thread_tls_once, thread_tls_once_func);
 123     return pa_tls_get(thread_tls);
 124 }
 125
 126 void pa_thread_yield(void) {
 127     Sleep(0);
 128 }
 129
 130 static DWORD WINAPI monitor_thread_func(LPVOID param) {
 131     struct pa_tls_monitor *m = param;
 132     assert(m);
 133
 134     WaitForSingleObject(m->thread, INFINITE);
 135
 136     CloseHandle(m->thread);
 137
 138     m->free_func(m->data);
 139
 140     pa_xfree(m);
 141
 142     return 0;
 143 }
 144
 145 pa_tls* pa_tls_new(pa_free_cb_t free_cb) {
 146     pa_tls *t;
 147
 148     t = pa_xnew(pa_tls, 1);
 149     t->index = TlsAlloc();
 150     t->free_func = free_cb;
 151
 152     if (t->index == TLS_OUT_OF_INDEXES) {
 153         pa_xfree(t);
 154         return NULL;
 155     }
 156
 157     return t;
 158 }
 159
 160 void pa_tls_free(pa_tls *t) {
 161     assert(t);
 162
 163     TlsFree(t->index);
 164     pa_xfree(t);
 165 }
 166
 167 void *pa_tls_get(pa_tls *t) {
 168     assert(t);
 169
 170     return TlsGetValue(t->index);
 171 }
 172
 173 void *pa_tls_set(pa_tls *t, void *userdata) {
 174     void *r;
 175
 176     assert(t);
 177
 178     r = TlsGetValue(t->index);
 179
 180     TlsSetValue(t->index, userdata);
 181
 182     if (t->free_func) {
 183         struct pa_tls_monitor *m;
 184
 185         PA_ONCE_BEGIN {
 186             monitor_tls = pa_tls_new(NULL);
 187             assert(monitor_tls);
 188             pa_tls_set(monitor_tls, NULL);
 189         } PA_ONCE_END;
 190
 191         m = pa_tls_get(monitor_tls);
 192         if (!m) {
 193             HANDLE thread;
 194
 195             m = pa_xnew(struct pa_tls_monitor, 1);
 196
 197             DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
 198                 GetCurrentProcess(), &m->thread, 0, FALSE,
 199                 DUPLICATE_SAME_ACCESS);
 200
 201             m->free_func = t->free_func;
 202
 203             pa_tls_set(monitor_tls, m);
 204
 205             thread = CreateThread(NULL, 0, monitor_thread_func, m, 0, NULL);
 206             assert(thread);
 207             CloseHandle(thread);
 208         }
 209
 210         m->data = userdata;
 211     }
 212
 213     return r;
 214 }