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 MATTHIAS 24 * RINGWALD 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 run_loop_pipe_mutex; 62 static btstack_data_source_t run_loop_pipe_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 = (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 while (true) { 89 90 // process timers 91 uint32_t now_ms = btstack_run_loop_windows_get_time_ms(); 92 btstack_run_loop_base_process_timers(now_ms); 93 94 // get next timeout 95 int32_t timeout_ms = btstack_run_loop_base_get_time_until_timeout(now_ms); 96 if (timeout_ms < 0){ 97 timeout_ms = INFINITE; 98 } 99 100 // collect handles to wait for 101 HANDLE handles[100]; 102 memset(handles, 0, sizeof(handles)); 103 int num_handles = 0; 104 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 105 while (btstack_linked_list_iterator_has_next(&it)){ 106 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 107 if (ds->source.handle == 0) continue; 108 if (ds->flags & (DATA_SOURCE_CALLBACK_READ | DATA_SOURCE_CALLBACK_WRITE)){ 109 handles[num_handles++] = ds->source.handle; 110 log_debug("btstack_run_loop_execute adding handle %p", ds->source.handle); 111 } 112 } 113 114 // wait for timeout or data source to become ready 115 int res; 116 if (num_handles){ 117 // wait for ready Events or timeout 118 res = WaitForMultipleObjects(num_handles, &handles[0], 0, timeout_ms); 119 } else { 120 // just wait for timeout 121 Sleep(timeout_ms); 122 res = WAIT_TIMEOUT; 123 } 124 125 // process data source 126 if (WAIT_OBJECT_0 <= res && res < (WAIT_OBJECT_0 + num_handles)){ 127 void * triggered_handle = handles[res - WAIT_OBJECT_0]; 128 btstack_linked_list_iterator_init(&it, &btstack_run_loop_base_data_sources); 129 while (btstack_linked_list_iterator_has_next(&it)){ 130 btstack_data_source_t *ds = (btstack_data_source_t*) btstack_linked_list_iterator_next(&it); 131 log_debug("btstack_run_loop_windows_execute: check ds %p with handle %p\n", ds, ds->source.handle); 132 if (triggered_handle == ds->source.handle){ 133 if (ds->flags & DATA_SOURCE_CALLBACK_READ){ 134 log_debug("btstack_run_loop_windows_execute: process read ds %p with handle %p\n", ds, ds->source.handle); 135 ds->process(ds, DATA_SOURCE_CALLBACK_READ); 136 } else if (ds->flags & DATA_SOURCE_CALLBACK_WRITE){ 137 log_debug("btstack_run_loop_windows_execute: process write ds %p with handle %p\n", ds, ds->source.handle); 138 ds->process(ds, DATA_SOURCE_CALLBACK_WRITE); 139 } 140 break; 141 } 142 } 143 } 144 } 145 } 146 147 static void btstack_run_loop_windows_trigger_exit(void){ 148 run_loop_exit_requested = true; 149 } 150 151 // set timer 152 static void btstack_run_loop_windows_set_timer(btstack_timer_source_t *a, uint32_t timeout_in_ms){ 153 uint32_t time_ms = btstack_run_loop_windows_get_time_ms(); 154 a->timeout = time_ms + timeout_in_ms; 155 log_debug("btstack_run_loop_windows_set_timer to %u ms (now %u, timeout %u)", a->timeout, time_ms, timeout_in_ms); 156 } 157 158 static void btstack_run_loop_windwos_pipe_process(btstack_data_source_t * ds, btstack_data_source_callback_type_t callback_type){ 159 UNUSED(callback_type); 160 161 // execute callbacks 162 while (1){ 163 // protect list with mutex (Win32 style) 164 DWORD dwWaitResult = WaitForSingleObject( run_loop_pipe_mutex, INFINITE); 165 if (dwWaitResult != WAIT_OBJECT_0) return; 166 167 btstack_context_callback_registration_t * callback_registration = (btstack_context_callback_registration_t *) btstack_linked_list_pop(&btstack_run_loop_base_callbacks); 168 ReleaseMutex(run_loop_pipe_mutex); 169 170 if (callback_registration == NULL){ 171 break; 172 } 173 (*callback_registration->callback)(callback_registration->context); 174 } 175 } 176 177 static void btstack_run_loop_windows_execute_on_main_thread(btstack_context_callback_registration_t * callback_registration){ 178 if (run_loop_pipe_ds.source.handle == NULL) return; 179 180 // protect list with mutex (Win32 style) 181 DWORD dwWaitResult = WaitForSingleObject( run_loop_pipe_mutex, INFINITE); 182 if (dwWaitResult != WAIT_OBJECT_0) return; 183 184 // We own mutex now, add callback to list 185 btstack_run_loop_base_add_callback(callback_registration); 186 ReleaseMutex(run_loop_pipe_mutex); 187 // trigger run loop 188 SetEvent(run_loop_pipe_ds.source.handle); 189 } 190 191 192 static void btstack_run_loop_windows_init(void){ 193 btstack_run_loop_base_init(); 194 195 // store start time 196 FILETIME file_time; 197 SYSTEMTIME system_time; 198 GetSystemTime(&system_time); 199 SystemTimeToFileTime(&system_time, &file_time); 200 start_time.LowPart = file_time.dwLowDateTime; 201 start_time.HighPart = file_time.dwHighDateTime; 202 203 // Create mutex with no initial owner 204 run_loop_pipe_mutex = CreateMutex( 205 NULL, // default security attributes 206 FALSE, // initially not owned 207 NULL); // unnamed mutex 208 if (run_loop_pipe_mutex == NULL){ 209 log_info("CreateMutex error: %ld\n", GetLastError()); 210 return; 211 } 212 213 // create Event that can be notified from other thread. bManualReset is fALSE => Object is auto-reset 214 run_loop_pipe_ds.source.handle = CreateEvent(NULL, FALSE, FALSE, NULL); 215 btstack_run_loop_enable_data_source_callbacks(&run_loop_pipe_ds, DATA_SOURCE_CALLBACK_READ); 216 btstack_run_loop_set_data_source_handler(&run_loop_pipe_ds, &btstack_run_loop_windwos_pipe_process); 217 btstack_run_loop_add_data_source(&run_loop_pipe_ds); 218 } 219 220 static const btstack_run_loop_t btstack_run_loop_windows = { 221 &btstack_run_loop_windows_init, 222 &btstack_run_loop_base_add_data_source, 223 &btstack_run_loop_base_remove_data_source, 224 &btstack_run_loop_base_enable_data_source_callbacks, 225 &btstack_run_loop_base_disable_data_source_callbacks, 226 &btstack_run_loop_windows_set_timer, 227 &btstack_run_loop_base_add_timer, 228 &btstack_run_loop_base_remove_timer, 229 &btstack_run_loop_windows_execute, 230 &btstack_run_loop_base_dump_timer, 231 &btstack_run_loop_windows_get_time_ms, 232 NULL, /* poll data sources from irq */ 233 btstack_run_loop_windows_execute_on_main_thread, 234 btstack_run_loop_windows_trigger_exit 235 }; 236 237 /** 238 * Provide btstack_run_loop_windows instance 239 */ 240 const btstack_run_loop_t * btstack_run_loop_windows_get_instance(void){ 241 return &btstack_run_loop_windows; 242 } 243 244