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/log.h>
  32 #include <pulsecore/once.h>
  33
  34 #include "thread.h"
  35
  36 struct pa_thread {
  37     HANDLE thread;
  38     pa_thread_func_t thread_func;
  39     void *userdata;
  40 };
  41
  42 struct pa_tls {
  43     DWORD index;
  44     pa_free_cb_t free_func;
  45 };
  46
  47 struct pa_tls_monitor {
  48     HANDLE thread;
  49     pa_free_cb_t free_func;
  50     void *data;
  51 };
  52
  53 static pa_tls *thread_tls;
  54 static pa_once thread_tls_once = PA_ONCE_INIT;
  55 static pa_tls *monitor_tls;
  56
  57 static void thread_tls_once_func(void) {
  58     thread_tls = pa_tls_new(NULL);
  59     assert(thread_tls);
  60 }
  61
  62 static DWORD WINAPI internal_thread_func(LPVOID param) {
  63     pa_thread *t = param;
  64     assert(t);
  65
  66     pa_run_once(&thread_tls_once, thread_tls_once_func);
  67     pa_tls_set(thread_tls, t);
  68
  69     t->thread_func(t->userdata);
  70
  71     return 0;
  72 }
  73
  74 pa_thread* pa_thread_new(const char *name, pa_thread_func_t thread_func, void *userdata) {
  75     pa_thread *t;
  76     DWORD thread_id;
  77
  78     assert(thread_func);
  79
  80     t = pa_xnew(pa_thread, 1);
  81     t->thread_func = thread_func;
  82     t->userdata = userdata;
  83
  84     t->thread = CreateThread(NULL, 0, internal_thread_func, t, 0, &thread_id);
  85
  86     if (!t->thread) {
  87         pa_xfree(t);
  88         return NULL;
  89     }
  90
  91     return t;
  92 }
  93
  94 int pa_thread_is_running(pa_thread *t) {
  95     DWORD code;
  96
  97     assert(t);
  98
  99     if (!GetExitCodeThread(t->thread, &code))
 100         return 0;
 101
 102     return code == STILL_ACTIVE;
 103 }
 104
 105 void pa_thread_free(pa_thread *t) {
 106     assert(t);
 107
 108     pa_thread_join(t);
 109     CloseHandle(t->thread);
 110     pa_xfree(t);
 111 }
 112
 113 int pa_thread_join(pa_thread *t) {
 114     assert(t);
 115
 116     if (WaitForSingleObject(t->thread, INFINITE) == WAIT_FAILED)
 117         return -1;
 118
 119     return 0;
 120 }
 121
 122 pa_thread* pa_thread_self(void) {
 123     pa_run_once(&thread_tls_once, thread_tls_once_func);
 124     return pa_tls_get(thread_tls);
 125 }
 126
 127 void pa_thread_yield(void) {
 128     Sleep(0);
 129 }
 130
 131 static DWORD WINAPI monitor_thread_func(LPVOID param) {
 132     struct pa_tls_monitor *m = param;
 133     assert(m);
 134
 135     WaitForSingleObject(m->thread, INFINITE);
 136
 137     CloseHandle(m->thread);
 138
 139     m->free_func(m->data);
 140
 141     pa_xfree(m);
 142
 143     return 0;
 144 }
 145
 146 pa_tls* pa_tls_new(pa_free_cb_t free_cb) {
 147     pa_tls *t;
 148
 149     t = pa_xnew(pa_tls, 1);
 150     t->index = TlsAlloc();
 151     t->free_func = free_cb;
 152
 153     if (t->index == TLS_OUT_OF_INDEXES) {
 154         pa_xfree(t);
 155         return NULL;
 156     }
 157
 158     return t;
 159 }
 160
 161 void pa_tls_free(pa_tls *t) {
 162     assert(t);
 163
 164     TlsFree(t->index);
 165     pa_xfree(t);
 166 }
 167
 168 void *pa_tls_get(pa_tls *t) {
 169     assert(t);
 170
 171     return TlsGetValue(t->index);
 172 }
 173
 174 void *pa_tls_set(pa_tls *t, void *userdata) {
 175     void *r;
 176
 177     assert(t);
 178
 179     r = TlsGetValue(t->index);
 180
 181     TlsSetValue(t->index, userdata);
 182
 183     if (t->free_func) {
 184         struct pa_tls_monitor *m;
 185
 186         PA_ONCE_BEGIN {
 187             monitor_tls = pa_tls_new(NULL);
 188             assert(monitor_tls);
 189             pa_tls_set(monitor_tls, NULL);
 190         } PA_ONCE_END;
 191
 192         m = pa_tls_get(monitor_tls);
 193         if (!m) {
 194             HANDLE thread;
 195
 196             m = pa_xnew(struct pa_tls_monitor, 1);
 197
 198             DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
 199                 GetCurrentProcess(), &m->thread, 0, FALSE,
 200                 DUPLICATE_SAME_ACCESS);
 201
 202             m->free_func = t->free_func;
 203
 204             pa_tls_set(monitor_tls, m);
 205
 206             thread = CreateThread(NULL, 0, monitor_thread_func, m, 0, NULL);
 207             assert(thread);
 208             CloseHandle(thread);
 209         }
 210
 211         m->data = userdata;
 212     }
 213
 214     return r;
 215 }