1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN 24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "btstack_run_loop_windows.c" 39 40 /* 41 * btstack_run_loop_windows.c 42 */ 43 44 #include "btstack_run_loop.h" 45 #include "btstack_run_loop_windows.h" 46 #include "btstack_linked_list.h" 47 #include "btstack_debug.h" 48 #include "btstack_util.h" 49 50 #include <Windows.h> 51 52 #include <stdio.h> 53 #include <stdlib.h> 54 55 // start time. 56 static ULARGE_INTEGER start_time; 57 58 static bool run_loop_exit_requested; 59 60 // to trigger run loop from other thread 61 static HANDLE btstack_run_loop_windows_callbacks_mutex; 62 static btstack_data_source_t btstack_run_loop_windows_process_callbacks_ds; 63 static btstack_data_source_t btstack_run_loop_windows_poll_data_sources_ds; 64 65 /** 66 * @brief Queries the current time in ms since start 67 */ 68 static uint32_t btstack_run_loop_windows_get_time_ms(void){ 69 70 FILETIME file_time; 71 SYSTEMTIME system_time; 72 ULARGE_INTEGER now_time; 73 GetSystemTime(&system_time); 74 SystemTimeToFileTime(&system_time, &file_time); 75 now_time.LowPart = file_time.dwLowDateTime; 76 now_time.HighPart = file_time.dwHighDateTime; 77 uint32_t time_ms = (uint32_t)((now_time.QuadPart - start_time.QuadPart) / 10000); 78 log_debug("btstack_run_loop_windows_get_time_ms: %u", time_ms); 79 return time_ms; 80 } 81 82 /** 83 * Execute run_loop 84 */ 85 static void btstack_run_loop_windows_execute(void) { 86 87 btstack_linked_list_iterator_t it; 88 89 while (true) { 90 91 // process timers 92 uint32_t now_ms = btstack_run_loop_windows_get_time_ms(); 93 btstack_run_loop_base_process_timers(now_ms); 94 95 // get next timeout 96 int32_t timeout_ms = btstack_run_loop_base_get_time_until_timeout(now_ms); 97 if (timeout_ms < 0){ 98 timeout_ms = INFINITE; 99 } 100 101 // collect handles to wait for 102 HANDLE handles[100]; 103 memset(handles, 0, sizeof(handles)); 104 int num_handles = 0; 105 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 106 while (btstack_linked_list_iterator_has_next(&it)){ 107 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 108 if (ds->source.handle == 0) continue; 109 if (ds->flags & (DATA_SOURCE_CALLBACK_READ | DATA_SOURCE_CALLBACK_WRITE)){ 110 handles[num_handles++] = ds->source.handle; 111 log_debug("btstack_run_loop_execute adding handle %p", ds->source.handle); 112 } 113 } 114 115 // wait for timeout or data source to become ready 116 DWORD res; 117 if (num_handles){ 118 // wait for ready Events or timeout 119 res = WaitForMultipleObjects(num_handles, &handles[0], 0, timeout_ms); 120 } else { 121 // just wait for timeout 122 Sleep(timeout_ms); 123 res = WAIT_TIMEOUT; 124 } 125 126 // process data source 127 if (WAIT_OBJECT_0 <= res && res < (WAIT_OBJECT_0 + num_handles)){ 128 void * triggered_handle = handles[res - WAIT_OBJECT_0]; 129 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 130 while (btstack_linked_list_iterator_has_next(&it)){ 131 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 132 log_debug("btstack_run_loop_windows_execute: check ds %p with handle %p\n", ds, ds->source.handle); 133 if (triggered_handle == ds->source.handle){ 134 if (ds->flags & DATA_SOURCE_CALLBACK_READ){ 135 log_debug("btstack_run_loop_windows_execute: process read ds %p with handle %p\n", ds, ds->source.handle); 136 ds->process(ds, DATA_SOURCE_CALLBACK_READ); 137 } else if (ds->flags & DATA_SOURCE_CALLBACK_WRITE){ 138 log_debug("btstack_run_loop_windows_execute: process write ds %p with handle %p\n", ds, ds->source.handle); 139 ds->process(ds, DATA_SOURCE_CALLBACK_WRITE); 140 } 141 break; 142 } 143 } 144 } 145 } 146 } 147 148 static void btstack_run_loop_windows_trigger_exit(void){ 149 run_loop_exit_requested = true; 150 } 151 152 // set timer 153 static void btstack_run_loop_windows_set_timer(btstack_timer_source_t *a, uint32_t timeout_in_ms){ 154 uint32_t time_ms = btstack_run_loop_windows_get_time_ms(); 155 a->timeout = time_ms + timeout_in_ms; 156 log_debug("btstack_run_loop_windows_set_timer to %u ms (now %u, timeout %u)", a->timeout, time_ms, timeout_in_ms); 157 } 158 159 static void btstack_run_loop_windows_process_callbacks_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 160 UNUSED(callback_type); 161 162 // execute callbacks 163 while (1){ 164 // protect list with mutex (Win32 style) 165 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 166 if (dwWaitResult != WAIT_OBJECT_0) return; 167 168 btstack_context_callback_registration_t * callback_registration = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&btstack_run_loop_base_callbacks); 169 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 170 171 if (callback_registration == NULL){ 172 break; 173 } 174 (*callback_registration->callback)(callback_registration->context); 175 } 176 } 177 178 static void btstack_run_loop_windows_execute_on_main_thread(btstack_context_callback_registration_t * callback_registration){ 179 if (btstack_run_loop_windows_process_callbacks_ds.source.handle == NULL) return; 180 181 // protect list with mutex (Win32 style) 182 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 183 if (dwWaitResult != WAIT_OBJECT_0) return; 184 185 // We own mutex now, add callback to list 186 btstack_run_loop_base_add_callback(callback_registration); 187 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 188 // trigger run loop 189 SetEvent(btstack_run_loop_windows_process_callbacks_ds.source.handle); 190 } 191 192 193 static void btstack_run_loop_windows_poll_data_sources_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 194 UNUSED(callback_type); 195 btstack_run_loop_base_poll_data_sources(); 196 } 197 198 static void btstack_run_loop_windows_poll_data_sources_from_irq(void){ 199 SetEvent(btstack_run_loop_windows_poll_data_sources_ds.source.handle); 200 } 201 202 static void btstack_run_loop_windows_init(void){ 203 btstack_run_loop_base_init(); 204 205 // store start time 206 FILETIME file_time; 207 SYSTEMTIME system_time; 208 GetSystemTime(&system_time); 209 SystemTimeToFileTime(&system_time, &file_time); 210 start_time.LowPart = file_time.dwLowDateTime; 211 start_time.HighPart = file_time.dwHighDateTime; 212 213 // Create mutex with no initial owner 214 btstack_run_loop_windows_callbacks_mutex = CreateMutex( 215 NULL, // default security attributes 216 FALSE, // initially not owned 217 NULL); // unnamed mutex 218 if (btstack_run_loop_windows_callbacks_mutex == NULL){ 219 log_info("CreateMutex error: %ld\n", GetLastError()); 220 return; 221 } 222 223 // create Event that can be notified from other thread. bManualReset is fALSE => Object is auto-reset 224 btstack_run_loop_windows_process_callbacks_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 225 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_process_callbacks_ds, DATA_SOURCE_CALLBACK_READ); 226 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_process_callbacks_ds, &btstack_run_loop_windows_process_callbacks_handler); 227 btstack_run_loop_add_data_source(&btstack_run_loop_windows_process_callbacks_ds); 228 229 btstack_run_loop_windows_poll_data_sources_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 230 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_poll_data_sources_ds, DATA_SOURCE_CALLBACK_READ); 231 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_poll_data_sources_ds, &btstack_run_loop_windows_poll_data_sources_handler); 232 btstack_run_loop_add_data_source(&btstack_run_loop_windows_poll_data_sources_ds); 233 } 234 235 static const btstack_run_loop_t btstack_run_loop_windows = { 236 &btstack_run_loop_windows_init, 237 &btstack_run_loop_base_add_data_source, 238 &btstack_run_loop_base_remove_data_source, 239 &btstack_run_loop_base_enable_data_source_callbacks, 240 &btstack_run_loop_base_disable_data_source_callbacks, 241 &btstack_run_loop_windows_set_timer, 242 &btstack_run_loop_base_add_timer, 243 &btstack_run_loop_base_remove_timer, 244 &btstack_run_loop_windows_execute, 245 &btstack_run_loop_base_dump_timer, 246 &btstack_run_loop_windows_get_time_ms, 247 &btstack_run_loop_windows_poll_data_sources_from_irq, 248 &btstack_run_loop_windows_execute_on_main_thread, 249 &btstack_run_loop_windows_trigger_exit 250 }; 251 252 /** 253 * Provide btstack_run_loop_windows instance 254 */ 255 const btstack_run_loop_t * btstack_run_loop_windows_get_instance(void){ 256 return &btstack_run_loop_windows; 257 } 258 259