1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22
23 #if SDL_THREAD_WINDOWS
24
25 /* Win32 thread management routines for SDL */
26
27 #include "SDL_hints.h"
28 #include "SDL_thread.h"
29 #include "../SDL_thread_c.h"
30 #include "../SDL_systhread.h"
31 #include "SDL_systhread_c.h"
32
33 #ifndef SDL_PASSED_BEGINTHREAD_ENDTHREAD
34 /* We'll use the C library from this DLL */
35 #include <process.h>
36
37 #ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
38 #define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
39 #endif
40
41 /* Cygwin gcc-3 ... MingW64 (even with a i386 host) does this like MSVC. */
42 #if (defined(__MINGW32__) && (__GNUC__ < 4))
43 typedef unsigned long (__cdecl *pfnSDL_CurrentBeginThread) (void *, unsigned,
44 unsigned (__stdcall *func)(void *), void *arg,
45 unsigned, unsigned *threadID);
46 typedef void (__cdecl *pfnSDL_CurrentEndThread)(unsigned code);
47
48 #elif defined(__WATCOMC__)
49 /* This is for Watcom targets except OS2 */
50 #if __WATCOMC__ < 1240
51 #define __watcall
52 #endif
53 typedef unsigned long (__watcall * pfnSDL_CurrentBeginThread) (void *,
54 unsigned,
55 unsigned
56 (__stdcall *
57 func) (void
58 *),
59 void *arg,
60 unsigned,
61 unsigned
62 *threadID);
63 typedef void (__watcall * pfnSDL_CurrentEndThread) (unsigned code);
64
65 #else
66 typedef uintptr_t(__cdecl * pfnSDL_CurrentBeginThread) (void *, unsigned,
67 unsigned (__stdcall *
68 func) (void
69 *),
70 void *arg, unsigned,
71 unsigned *threadID);
72 typedef void (__cdecl * pfnSDL_CurrentEndThread) (unsigned code);
73 #endif
74 #endif /* !SDL_PASSED_BEGINTHREAD_ENDTHREAD */
75
76
77 typedef struct ThreadStartParms
78 {
79 void *args;
80 pfnSDL_CurrentEndThread pfnCurrentEndThread;
81 } tThreadStartParms, *pThreadStartParms;
82
83 static DWORD
RunThread(void * data)84 RunThread(void *data)
85 {
86 pThreadStartParms pThreadParms = (pThreadStartParms) data;
87 pfnSDL_CurrentEndThread pfnEndThread = pThreadParms->pfnCurrentEndThread;
88 void *args = pThreadParms->args;
89 SDL_free(pThreadParms);
90 SDL_RunThread(args);
91 if (pfnEndThread != NULL)
92 pfnEndThread(0);
93 return (0);
94 }
95
96 static DWORD WINAPI
RunThreadViaCreateThread(LPVOID data)97 RunThreadViaCreateThread(LPVOID data)
98 {
99 return RunThread(data);
100 }
101
102 static unsigned __stdcall
RunThreadViaBeginThreadEx(void * data)103 RunThreadViaBeginThreadEx(void *data)
104 {
105 return (unsigned) RunThread(data);
106 }
107
108 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
109 int
SDL_SYS_CreateThread(SDL_Thread * thread,void * args,pfnSDL_CurrentBeginThread pfnBeginThread,pfnSDL_CurrentEndThread pfnEndThread)110 SDL_SYS_CreateThread(SDL_Thread * thread, void *args,
111 pfnSDL_CurrentBeginThread pfnBeginThread,
112 pfnSDL_CurrentEndThread pfnEndThread)
113 {
114 #elif defined(__CYGWIN__) || defined(__WINRT__)
115 int
116 SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
117 {
118 pfnSDL_CurrentBeginThread pfnBeginThread = NULL;
119 pfnSDL_CurrentEndThread pfnEndThread = NULL;
120 #else
121 int
122 SDL_SYS_CreateThread(SDL_Thread * thread, void *args)
123 {
124 pfnSDL_CurrentBeginThread pfnBeginThread = (pfnSDL_CurrentBeginThread)_beginthreadex;
125 pfnSDL_CurrentEndThread pfnEndThread = (pfnSDL_CurrentEndThread)_endthreadex;
126 #endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
127 pThreadStartParms pThreadParms =
128 (pThreadStartParms) SDL_malloc(sizeof(tThreadStartParms));
129 const DWORD flags = thread->stacksize ? STACK_SIZE_PARAM_IS_A_RESERVATION : 0;
130 if (!pThreadParms) {
131 return SDL_OutOfMemory();
132 }
133 /* Save the function which we will have to call to clear the RTL of calling app! */
134 pThreadParms->pfnCurrentEndThread = pfnEndThread;
135 /* Also save the real parameters we have to pass to thread function */
136 pThreadParms->args = args;
137
138 /* thread->stacksize == 0 means "system default", same as win32 expects */
139 if (pfnBeginThread) {
140 unsigned threadid = 0;
141 thread->handle = (SYS_ThreadHandle)
142 ((size_t) pfnBeginThread(NULL, (unsigned int) thread->stacksize,
143 RunThreadViaBeginThreadEx,
144 pThreadParms, flags, &threadid));
145 } else {
146 DWORD threadid = 0;
147 thread->handle = CreateThread(NULL, thread->stacksize,
148 RunThreadViaCreateThread,
149 pThreadParms, flags, &threadid);
150 }
151 if (thread->handle == NULL) {
152 return SDL_SetError("Not enough resources to create thread");
153 }
154 return 0;
155 }
156
157 #pragma pack(push,8)
158 typedef struct tagTHREADNAME_INFO
159 {
160 DWORD dwType; /* must be 0x1000 */
161 LPCSTR szName; /* pointer to name (in user addr space) */
162 DWORD dwThreadID; /* thread ID (-1=caller thread) */
163 DWORD dwFlags; /* reserved for future use, must be zero */
164 } THREADNAME_INFO;
165 #pragma pack(pop)
166
167 void
168 SDL_SYS_SetupThread(const char *name)
169 {
170 if ((name != NULL) && IsDebuggerPresent()) {
171 THREADNAME_INFO inf;
172
173 /* C# and friends will try to catch this Exception, let's avoid it. */
174 if (SDL_GetHintBoolean(SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING, SDL_FALSE)) {
175 return;
176 }
177
178 /* This magic tells the debugger to name a thread if it's listening. */
179 SDL_zero(inf);
180 inf.dwType = 0x1000;
181 inf.szName = name;
182 inf.dwThreadID = (DWORD) -1;
183 inf.dwFlags = 0;
184
185 /* The debugger catches this, renames the thread, continues on. */
186 RaiseException(0x406D1388, 0, sizeof(inf) / sizeof(ULONG), (const ULONG_PTR*) &inf);
187 }
188 }
189
190 SDL_threadID
191 SDL_ThreadID(void)
192 {
193 return ((SDL_threadID) GetCurrentThreadId());
194 }
195
196 int
197 SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
198 {
199 int value;
200
201 if (priority == SDL_THREAD_PRIORITY_LOW) {
202 value = THREAD_PRIORITY_LOWEST;
203 } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
204 value = THREAD_PRIORITY_HIGHEST;
205 } else {
206 value = THREAD_PRIORITY_NORMAL;
207 }
208 if (!SetThreadPriority(GetCurrentThread(), value)) {
209 return WIN_SetError("SetThreadPriority()");
210 }
211 return 0;
212 }
213
214 void
215 SDL_SYS_WaitThread(SDL_Thread * thread)
216 {
217 WaitForSingleObjectEx(thread->handle, INFINITE, FALSE);
218 CloseHandle(thread->handle);
219 }
220
221 void
222 SDL_SYS_DetachThread(SDL_Thread * thread)
223 {
224 CloseHandle(thread->handle);
225 }
226
227 #endif /* SDL_THREAD_WINDOWS */
228
229 /* vi: set ts=4 sw=4 expandtab: */
230