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 // clear exit flag 90 run_loop_exit_requested = false; 91 92 while (run_loop_exit_requested == false) { 93 94 // process timers 95 uint32_t now_ms = btstack_run_loop_windows_get_time_ms(); 96 btstack_run_loop_base_process_timers(now_ms); 97 98 // get next timeout 99 int32_t timeout_ms = btstack_run_loop_base_get_time_until_timeout(now_ms); 100 if (timeout_ms < 0){ 101 timeout_ms = INFINITE; 102 } 103 104 // collect handles to wait for 105 HANDLE handles[100]; 106 memset(handles, 0, sizeof(handles)); 107 int num_handles = 0; 108 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 109 while (btstack_linked_list_iterator_has_next(&it)){ 110 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 111 if (ds->source.handle == 0) continue; 112 if (ds->flags & (DATA_SOURCE_CALLBACK_READ | DATA_SOURCE_CALLBACK_WRITE)){ 113 handles[num_handles++] = ds->source.handle; 114 log_debug("btstack_run_loop_execute adding handle %p", ds->source.handle); 115 } 116 } 117 118 // wait for timeout or data source to become ready 119 DWORD res; 120 if (num_handles){ 121 // wait for ready Events or timeout 122 res = WaitForMultipleObjects(num_handles, &handles[0], 0, timeout_ms); 123 } else { 124 // just wait for timeout 125 Sleep(timeout_ms); 126 res = WAIT_TIMEOUT; 127 } 128 129 // process data source 130 if (WAIT_OBJECT_0 <= res && res < (WAIT_OBJECT_0 + num_handles)){ 131 void * triggered_handle = handles[res - WAIT_OBJECT_0]; 132 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 133 while (btstack_linked_list_iterator_has_next(&it)){ 134 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 135 log_debug("btstack_run_loop_windows_execute: check ds %p with handle %p\n", ds, ds->source.handle); 136 if (triggered_handle == ds->source.handle){ 137 if (ds->flags & DATA_SOURCE_CALLBACK_READ){ 138 log_debug("btstack_run_loop_windows_execute: process read ds %p with handle %p\n", ds, ds->source.handle); 139 ds->process(ds, DATA_SOURCE_CALLBACK_READ); 140 } else if (ds->flags & DATA_SOURCE_CALLBACK_WRITE){ 141 log_debug("btstack_run_loop_windows_execute: process write ds %p with handle %p\n", ds, ds->source.handle); 142 ds->process(ds, DATA_SOURCE_CALLBACK_WRITE); 143 } 144 break; 145 } 146 } 147 } 148 } 149 } 150 151 static void btstack_run_loop_windows_trigger_exit(void){ 152 run_loop_exit_requested = true; 153 } 154 155 // set timer 156 static void btstack_run_loop_windows_set_timer(btstack_timer_source_t *a, uint32_t timeout_in_ms){ 157 uint32_t time_ms = btstack_run_loop_windows_get_time_ms(); 158 a->timeout = time_ms + timeout_in_ms; 159 log_debug("btstack_run_loop_windows_set_timer to %u ms (now %u, timeout %u)", a->timeout, time_ms, timeout_in_ms); 160 } 161 162 static void btstack_run_loop_windows_process_callbacks_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 163 UNUSED(callback_type); 164 165 // execute callbacks 166 while (1){ 167 // protect list with mutex (Win32 style) 168 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 169 if (dwWaitResult != WAIT_OBJECT_0) return; 170 171 btstack_context_callback_registration_t * callback_registration = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&btstack_run_loop_base_callbacks); 172 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 173 174 if (callback_registration == NULL){ 175 break; 176 } 177 (*callback_registration->callback)(callback_registration->context); 178 } 179 } 180 181 static void btstack_run_loop_windows_execute_on_main_thread(btstack_context_callback_registration_t * callback_registration){ 182 if (btstack_run_loop_windows_process_callbacks_ds.source.handle == NULL) return; 183 184 // protect list with mutex (Win32 style) 185 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 186 if (dwWaitResult != WAIT_OBJECT_0) return; 187 188 // We own mutex now, add callback to list 189 btstack_run_loop_base_add_callback(callback_registration); 190 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 191 // trigger run loop 192 SetEvent(btstack_run_loop_windows_process_callbacks_ds.source.handle); 193 } 194 195 196 static void btstack_run_loop_windows_poll_data_sources_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 197 UNUSED(callback_type); 198 btstack_run_loop_base_poll_data_sources(); 199 } 200 201 static void btstack_run_loop_windows_poll_data_sources_from_irq(void){ 202 SetEvent(btstack_run_loop_windows_poll_data_sources_ds.source.handle); 203 } 204 205 static void btstack_run_loop_windows_init(void){ 206 btstack_run_loop_base_init(); 207 208 // store start time 209 FILETIME file_time; 210 SYSTEMTIME system_time; 211 GetSystemTime(&system_time); 212 SystemTimeToFileTime(&system_time, &file_time); 213 start_time.LowPart = file_time.dwLowDateTime; 214 start_time.HighPart = file_time.dwHighDateTime; 215 216 // Create mutex with no initial owner 217 btstack_run_loop_windows_callbacks_mutex = CreateMutex( 218 NULL, // default security attributes 219 FALSE, // initially not owned 220 NULL); // unnamed mutex 221 if (btstack_run_loop_windows_callbacks_mutex == NULL){ 222 log_info("CreateMutex error: %ld\n", GetLastError()); 223 return; 224 } 225 226 // create Event that can be notified from other thread. bManualReset is fALSE => Object is auto-reset 227 btstack_run_loop_windows_process_callbacks_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 228 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_process_callbacks_ds, DATA_SOURCE_CALLBACK_READ); 229 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_process_callbacks_ds, &btstack_run_loop_windows_process_callbacks_handler); 230 btstack_run_loop_add_data_source(&btstack_run_loop_windows_process_callbacks_ds); 231 232 btstack_run_loop_windows_poll_data_sources_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 233 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_poll_data_sources_ds, DATA_SOURCE_CALLBACK_READ); 234 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_poll_data_sources_ds, &btstack_run_loop_windows_poll_data_sources_handler); 235 btstack_run_loop_add_data_source(&btstack_run_loop_windows_poll_data_sources_ds); 236 } 237 238 static const btstack_run_loop_t btstack_run_loop_windows = { 239 &btstack_run_loop_windows_init, 240 &btstack_run_loop_base_add_data_source, 241 &btstack_run_loop_base_remove_data_source, 242 &btstack_run_loop_base_enable_data_source_callbacks, 243 &btstack_run_loop_base_disable_data_source_callbacks, 244 &btstack_run_loop_windows_set_timer, 245 &btstack_run_loop_base_add_timer, 246 &btstack_run_loop_base_remove_timer, 247 &btstack_run_loop_windows_execute, 248 &btstack_run_loop_base_dump_timer, 249 &btstack_run_loop_windows_get_time_ms, 250 &btstack_run_loop_windows_poll_data_sources_from_irq, 251 &btstack_run_loop_windows_execute_on_main_thread, 252 &btstack_run_loop_windows_trigger_exit 253 }; 254 255 /** 256 * Provide btstack_run_loop_windows instance 257 */ 258 const btstack_run_loop_t * btstack_run_loop_windows_get_instance(void){ 259 return &btstack_run_loop_windows; 260 } 261 262