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FORK: Simple Directmedia Layer
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SDL_systhread.c (8480B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 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 static DWORD
     78 RunThread(void *data)
     79 {
     80     SDL_Thread *thread = (SDL_Thread *) data;
     81     pfnSDL_CurrentEndThread pfnEndThread = (pfnSDL_CurrentEndThread) thread->endfunc;
     82     SDL_RunThread(thread);
     83     if (pfnEndThread != NULL) {
     84         pfnEndThread(0);
     85     }
     86     return 0;
     87 }
     88 
     89 static DWORD WINAPI
     90 RunThreadViaCreateThread(LPVOID data)
     91 {
     92   return RunThread(data);
     93 }
     94 
     95 static unsigned __stdcall
     96 RunThreadViaBeginThreadEx(void *data)
     97 {
     98   return (unsigned) RunThread(data);
     99 }
    100 
    101 #ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
    102 int
    103 SDL_SYS_CreateThread(SDL_Thread * thread,
    104                      pfnSDL_CurrentBeginThread pfnBeginThread,
    105                      pfnSDL_CurrentEndThread pfnEndThread)
    106 {
    107 #elif defined(__CYGWIN__) || defined(__WINRT__)
    108 int
    109 SDL_SYS_CreateThread(SDL_Thread * thread)
    110 {
    111     pfnSDL_CurrentBeginThread pfnBeginThread = NULL;
    112     pfnSDL_CurrentEndThread pfnEndThread = NULL;
    113 #else
    114 int
    115 SDL_SYS_CreateThread(SDL_Thread * thread)
    116 {
    117     pfnSDL_CurrentBeginThread pfnBeginThread = (pfnSDL_CurrentBeginThread)_beginthreadex;
    118     pfnSDL_CurrentEndThread pfnEndThread = (pfnSDL_CurrentEndThread)_endthreadex;
    119 #endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
    120     const DWORD flags = thread->stacksize ? STACK_SIZE_PARAM_IS_A_RESERVATION : 0;
    121 
    122     /* Save the function which we will have to call to clear the RTL of calling app! */
    123     thread->endfunc = pfnEndThread;
    124 
    125     /* thread->stacksize == 0 means "system default", same as win32 expects */
    126     if (pfnBeginThread) {
    127         unsigned threadid = 0;
    128         thread->handle = (SYS_ThreadHandle)
    129             ((size_t) pfnBeginThread(NULL, (unsigned int) thread->stacksize,
    130                                      RunThreadViaBeginThreadEx,
    131                                      thread, flags, &threadid));
    132     } else {
    133         DWORD threadid = 0;
    134         thread->handle = CreateThread(NULL, thread->stacksize,
    135                                       RunThreadViaCreateThread,
    136                                       thread, flags, &threadid);
    137     }
    138     if (thread->handle == NULL) {
    139         return SDL_SetError("Not enough resources to create thread");
    140     }
    141     return 0;
    142 }
    143 
    144 #pragma pack(push,8)
    145 typedef struct tagTHREADNAME_INFO
    146 {
    147     DWORD dwType; /* must be 0x1000 */
    148     LPCSTR szName; /* pointer to name (in user addr space) */
    149     DWORD dwThreadID; /* thread ID (-1=caller thread) */
    150     DWORD dwFlags; /* reserved for future use, must be zero */
    151 } THREADNAME_INFO;
    152 #pragma pack(pop)
    153 
    154 
    155 typedef HRESULT (WINAPI *pfnSetThreadDescription)(HANDLE, PCWSTR);
    156 
    157 void
    158 SDL_SYS_SetupThread(const char *name)
    159 {
    160     if (name != NULL) {
    161         #ifndef __WINRT__   /* !!! FIXME: There's no LoadLibrary() in WinRT; don't know if SetThreadDescription is available there at all at the moment. */
    162         static pfnSetThreadDescription pSetThreadDescription = NULL;
    163         static HMODULE kernel32 = 0;
    164 
    165         if (!kernel32) {
    166             kernel32 = LoadLibraryW(L"kernel32.dll");
    167             if (kernel32) {
    168                 pSetThreadDescription = (pfnSetThreadDescription) GetProcAddress(kernel32, "SetThreadDescription");
    169             }
    170         }
    171 
    172         if (pSetThreadDescription != NULL) {
    173             WCHAR *strw = WIN_UTF8ToString(name);
    174             if (strw) {
    175                 pSetThreadDescription(GetCurrentThread(), strw);
    176                 SDL_free(strw);
    177             }
    178         }
    179         #endif
    180 
    181         /* Presumably some version of Visual Studio will understand SetThreadDescription(),
    182            but we still need to deal with older OSes and debuggers. Set it with the arcane
    183            exception magic, too. */
    184 
    185         if (IsDebuggerPresent()) {
    186             THREADNAME_INFO inf;
    187 
    188             /* C# and friends will try to catch this Exception, let's avoid it. */
    189             if (SDL_GetHintBoolean(SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING, SDL_TRUE)) {
    190                 return;
    191             }
    192 
    193             /* This magic tells the debugger to name a thread if it's listening. */
    194             SDL_zero(inf);
    195             inf.dwType = 0x1000;
    196             inf.szName = name;
    197             inf.dwThreadID = (DWORD) -1;
    198             inf.dwFlags = 0;
    199 
    200             /* The debugger catches this, renames the thread, continues on. */
    201             RaiseException(0x406D1388, 0, sizeof(inf) / sizeof(ULONG), (const ULONG_PTR*) &inf);
    202         }
    203     }
    204 }
    205 
    206 SDL_threadID
    207 SDL_ThreadID(void)
    208 {
    209     return ((SDL_threadID) GetCurrentThreadId());
    210 }
    211 
    212 int
    213 SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
    214 {
    215     int value;
    216 
    217     if (priority == SDL_THREAD_PRIORITY_LOW) {
    218         value = THREAD_PRIORITY_LOWEST;
    219     } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
    220         value = THREAD_PRIORITY_HIGHEST;
    221     } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
    222         value = THREAD_PRIORITY_TIME_CRITICAL;
    223     } else {
    224         value = THREAD_PRIORITY_NORMAL;
    225     }
    226     if (!SetThreadPriority(GetCurrentThread(), value)) {
    227         return WIN_SetError("SetThreadPriority()");
    228     }
    229     return 0;
    230 }
    231 
    232 void
    233 SDL_SYS_WaitThread(SDL_Thread * thread)
    234 {
    235     WaitForSingleObjectEx(thread->handle, INFINITE, FALSE);
    236     CloseHandle(thread->handle);
    237 }
    238 
    239 void
    240 SDL_SYS_DetachThread(SDL_Thread * thread)
    241 {
    242     CloseHandle(thread->handle);
    243 }
    244 
    245 #endif /* SDL_THREAD_WINDOWS */
    246 
    247 /* vi: set ts=4 sw=4 expandtab: */