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 <Windows.h> 45 #include "btstack_run_loop.h" 46 #include "btstack_run_loop_windows.h" 47 #include "btstack_linked_list.h" 48 #include "btstack_debug.h" 49 #include "btstack_util.h" 50 51 #include <stdio.h> 52 #include <stdlib.h> 53 54 // start time. 55 static ULARGE_INTEGER start_time; 56 57 static bool run_loop_exit_requested; 58 59 // to trigger run loop from other thread 60 static HANDLE btstack_run_loop_windows_callbacks_mutex; 61 static btstack_data_source_t btstack_run_loop_windows_process_callbacks_ds; 62 static btstack_data_source_t btstack_run_loop_windows_poll_data_sources_ds; 63 64 /** 65 * @brief Queries the current time in ms since start 66 */ 67 static uint32_t btstack_run_loop_windows_get_time_ms(void){ 68 69 FILETIME file_time; 70 SYSTEMTIME system_time; 71 ULARGE_INTEGER now_time; 72 GetSystemTime(&system_time); 73 SystemTimeToFileTime(&system_time, &file_time); 74 now_time.LowPart = file_time.dwLowDateTime; 75 now_time.HighPart = file_time.dwHighDateTime; 76 uint32_t time_ms = (uint32_t)((now_time.QuadPart - start_time.QuadPart) / 10000); 77 log_debug("btstack_run_loop_windows_get_time_ms: %u", time_ms); 78 return time_ms; 79 } 80 81 /** 82 * Execute run_loop 83 */ 84 static void btstack_run_loop_windows_execute(void) { 85 86 btstack_linked_list_iterator_t it; 87 88 // clear exit flag 89 run_loop_exit_requested = false; 90 91 while (run_loop_exit_requested == false) { 92 93 // process timers 94 uint32_t now_ms = btstack_run_loop_windows_get_time_ms(); 95 btstack_run_loop_base_process_timers(now_ms); 96 97 // get next timeout 98 int32_t timeout_ms = btstack_run_loop_base_get_time_until_timeout(now_ms); 99 if (timeout_ms < 0){ 100 timeout_ms = INFINITE; 101 } 102 103 // collect handles to wait for 104 HANDLE handles[100]; 105 memset(handles, 0, sizeof(handles)); 106 int num_handles = 0; 107 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 108 while (btstack_linked_list_iterator_has_next(&it)){ 109 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 110 if (ds->source.handle == 0) continue; 111 if (ds->flags & (DATA_SOURCE_CALLBACK_READ | DATA_SOURCE_CALLBACK_WRITE)){ 112 handles[num_handles++] = ds->source.handle; 113 log_debug("btstack_run_loop_execute adding handle %p", ds->source.handle); 114 } 115 } 116 117 // wait for timeout or data source to become ready 118 DWORD res; 119 if (num_handles){ 120 // wait for ready Events or timeout 121 res = WaitForMultipleObjects(num_handles, &handles[0], 0, timeout_ms); 122 } else { 123 // just wait for timeout 124 Sleep(timeout_ms); 125 res = WAIT_TIMEOUT; 126 } 127 128 // process data source 129 if (WAIT_OBJECT_0 <= res && res < (WAIT_OBJECT_0 + num_handles)){ 130 void * triggered_handle = handles[res - WAIT_OBJECT_0]; 131 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 132 while (btstack_linked_list_iterator_has_next(&it)){ 133 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 134 log_debug("btstack_run_loop_windows_execute: check ds %p with handle %p\n", ds, ds->source.handle); 135 if (triggered_handle == ds->source.handle){ 136 if (ds->flags & DATA_SOURCE_CALLBACK_READ){ 137 log_debug("btstack_run_loop_windows_execute: process read ds %p with handle %p\n", ds, ds->source.handle); 138 ds->process(ds, DATA_SOURCE_CALLBACK_READ); 139 } else if (ds->flags & DATA_SOURCE_CALLBACK_WRITE){ 140 log_debug("btstack_run_loop_windows_execute: process write ds %p with handle %p\n", ds, ds->source.handle); 141 ds->process(ds, DATA_SOURCE_CALLBACK_WRITE); 142 } 143 break; 144 } 145 } 146 } 147 } 148 } 149 150 static void btstack_run_loop_windows_trigger_exit(void){ 151 run_loop_exit_requested = true; 152 } 153 154 // set timer 155 static void btstack_run_loop_windows_set_timer(btstack_timer_source_t *a, uint32_t timeout_in_ms){ 156 uint32_t time_ms = btstack_run_loop_windows_get_time_ms(); 157 a->timeout = time_ms + timeout_in_ms; 158 log_debug("btstack_run_loop_windows_set_timer to %u ms (now %u, timeout %u)", a->timeout, time_ms, timeout_in_ms); 159 } 160 161 static void btstack_run_loop_windows_process_callbacks_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 162 UNUSED(callback_type); 163 164 // execute callbacks 165 while (1){ 166 // protect list with mutex (Win32 style) 167 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 168 if (dwWaitResult != WAIT_OBJECT_0) return; 169 170 btstack_context_callback_registration_t * callback_registration = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&btstack_run_loop_base_callbacks); 171 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 172 173 if (callback_registration == NULL){ 174 break; 175 } 176 (*callback_registration->callback)(callback_registration->context); 177 } 178 } 179 180 static void btstack_run_loop_windows_execute_on_main_thread(btstack_context_callback_registration_t * callback_registration){ 181 if (btstack_run_loop_windows_process_callbacks_ds.source.handle == NULL) return; 182 183 // protect list with mutex (Win32 style) 184 DWORD dwWaitResult = WaitForSingleObject( btstack_run_loop_windows_callbacks_mutex, INFINITE); 185 if (dwWaitResult != WAIT_OBJECT_0) return; 186 187 // We own mutex now, add callback to list 188 btstack_run_loop_base_add_callback(callback_registration); 189 ReleaseMutex(btstack_run_loop_windows_callbacks_mutex); 190 // trigger run loop 191 SetEvent(btstack_run_loop_windows_process_callbacks_ds.source.handle); 192 } 193 194 195 static void btstack_run_loop_windows_poll_data_sources_handler(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 196 UNUSED(callback_type); 197 btstack_run_loop_base_poll_data_sources(); 198 } 199 200 static void btstack_run_loop_windows_poll_data_sources_from_irq(void){ 201 SetEvent(btstack_run_loop_windows_poll_data_sources_ds.source.handle); 202 } 203 204 static void btstack_run_loop_windows_init(void){ 205 btstack_run_loop_base_init(); 206 207 // store start time 208 FILETIME file_time; 209 SYSTEMTIME system_time; 210 GetSystemTime(&system_time); 211 SystemTimeToFileTime(&system_time, &file_time); 212 start_time.LowPart = file_time.dwLowDateTime; 213 start_time.HighPart = file_time.dwHighDateTime; 214 215 // Create mutex with no initial owner 216 btstack_run_loop_windows_callbacks_mutex = CreateMutex( 217 NULL, // default security attributes 218 FALSE, // initially not owned 219 NULL); // unnamed mutex 220 if (btstack_run_loop_windows_callbacks_mutex == NULL){ 221 log_info("CreateMutex error: %ld\n", GetLastError()); 222 return; 223 } 224 225 // create Event that can be notified from other thread. bManualReset is fALSE => Object is auto-reset 226 btstack_run_loop_windows_process_callbacks_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 227 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_process_callbacks_ds, DATA_SOURCE_CALLBACK_READ); 228 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_process_callbacks_ds, &btstack_run_loop_windows_process_callbacks_handler); 229 btstack_run_loop_add_data_source(&btstack_run_loop_windows_process_callbacks_ds); 230 231 btstack_run_loop_windows_poll_data_sources_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 232 btstack_run_loop_enable_data_source_callbacks(&btstack_run_loop_windows_poll_data_sources_ds, DATA_SOURCE_CALLBACK_READ); 233 btstack_run_loop_set_data_source_handler(&btstack_run_loop_windows_poll_data_sources_ds, &btstack_run_loop_windows_poll_data_sources_handler); 234 btstack_run_loop_add_data_source(&btstack_run_loop_windows_poll_data_sources_ds); 235 } 236 237 static const btstack_run_loop_t btstack_run_loop_windows = { 238 &btstack_run_loop_windows_init, 239 &btstack_run_loop_base_add_data_source, 240 &btstack_run_loop_base_remove_data_source, 241 &btstack_run_loop_base_enable_data_source_callbacks, 242 &btstack_run_loop_base_disable_data_source_callbacks, 243 &btstack_run_loop_windows_set_timer, 244 &btstack_run_loop_base_add_timer, 245 &btstack_run_loop_base_remove_timer, 246 &btstack_run_loop_windows_execute, 247 &btstack_run_loop_base_dump_timer, 248 &btstack_run_loop_windows_get_time_ms, 249 &btstack_run_loop_windows_poll_data_sources_from_irq, 250 &btstack_run_loop_windows_execute_on_main_thread, 251 &btstack_run_loop_windows_trigger_exit 252 }; 253 254 /** 255 * Provide btstack_run_loop_windows instance 256 */ 257 const btstack_run_loop_t * btstack_run_loop_windows_get_instance(void){ 258 return &btstack_run_loop_windows; 259 } 260 261